Refereed Journal Articles

2025

Low-density Ag–Au nanoparticle photodeposition on TiO₂ thin film photocatalysts grown by atomic layer deposition

B. D. Bhuskute, T. Tinus, H. Ali-Löytty, J. Saari, K. Lahtonen and M. Valden
Physical Chemistry Chemical Physics 27, 16865-16874, (2025)

Full text of article Low-density Ag–Au nanoparticle photodeposition on TiO₂ thin film photocatalysts grown by atomic layer deposition

Defect-Mediated Crystallization of the Particulate TiO₂ Photocatalyst Grown by Atomic Layer Deposition

B. D. Bhuskute, H. Ali-Löytty, J. Saari, A. Hiltunen, T.-P. Ruoko, T. Salminen and M. Valden
The Journal of Physical Chemistry C 129, 1, (2025)

Full text of article Defect-Mediated Crystallization of the Particulate TiO₂ Photocatalyst Grown by Atomic Layer Deposition

2024

Corrosion mechanisms of TiO₂ photoelectrode coatings in alkaline conditions

L. Palmolahti, J. Hämelahti, M. Hannula, H. Ali-Löytty, and M. Valden
Surface and Coatings Technology 494, 3, (2024)

Full text of article Corrosion mechanisms of TiO₂ photoelectrode coatings in alkaline conditions

Production of mixed phase Ti³⁺-rich TiO₂ thin films by oxide defect engineered crystallization

L. Palmolahti, H. Ali-Löytty, M. Hannula, T. Tinus, K. Lehtola, A. Tukiainen, J. Reuna and M. Valden
Nanoscale (2024)

Full text of article Production of mixed phase Ti³⁺-rich TiO₂ thin films by oxide defect engineered crystallization

Ti³⁺ Self-doping-mediated optimization of TiO₂ photocatalyst coating grown by atomic layer deposition

B. D. Bhuskute, H. Ali-Löytty, J. Saari, A. Tukiainen, and M. Valden
ACS Applied Engineering Materials 2, 9, 2278–2284 (2024)

Full text of article Ti³⁺ Self-doping-mediated optimization of TiO₂ photocatalyst coating grown by atomic layer deposition

Silver nanoparticle coatings with adjustable extinction spectra produced with liquid flame spray, and their role in photocatalytic enhancement of TiO₂

M. Sorvali, T. Tinus, J. Thamby, M. Honkanen, H. Ali-Löytty, A. Charmforoushan, M. Valden, J. J. Saarinen, and J. M. Mäkelä
Materials & Design 239, 112800 (2024)

Full text of article Silver nanoparticle coatings with adjustable extinction spectra produced with liquid flame spray, and their role in photocatalytic enhancement of TiO₂

2023

Water-resistant perovskite-inspired copper/silver pnictohalide nanocrystals for photoelectrochemical water splitting

M. Liu, G. K. Grandhi, B. Al-Anesi, H. Ali-Löytty, K. Lahtonen, R. Grisorio, and P. Vivo
Electrochimica Acta 462, 142734 (2023)

Full text of article Water-resistant perovskite-inspired copper/silver pnictohalide nanocrystals for photoelectrochemical water splitting

Less is more: Simplified fluorene-based dopant-free hole transport materials promote the long-term ambient stability of perovskite solar cells

P. Mäkinen, F. Fasulo, M. Liu, G. K. Grandhi, D. Conelli, B. Al-Anesi, H. Ali-Löytty, K. Lahtonen, S. Toikkonen, G. P. Suranna, A. B. Muñoz-García, M. Pavone, R. Grisorio, and P. Vivo
Chemistry of Materials 35, 2975-2987 (2023)

Full text of article Less is more: Simplified fluorene-based dopant-free hole transport materials promote the long-term ambient stability of perovskite solar cells

Role of CsMnCl₃ nanocrystal structure on its luminescence properties

A. Matuhina, G. K. Grandhi, F. Pan, M. Liu, H. Ali-Löytty, H. M. Ayedh, A. Tukiainen, J.-H. Smått, V. Vähänissi, H. Savin, J. Li, P. Rinke, and P. Vivo
ACS Applied Nano Materials 6, 953-965 (2023)

Full text of article Role of CsMnCl₃ nanocrystal structure on its luminescence properties

Antimony-Bismuth Alloying: The Key to a Major Boost in the Efficiency of Lead-Free Perovskite-Inspired Photovoltaics

B. Al-Anesi, G. K. Grandhi, A. Pecoraro, V. Sugathan, N. S. M. Viswanath, H. Ali-Löytty, M. Liu, T.-P. Ruoko, K. Lahtonen, D. Manna, S. Toikkonen, A. B. Muñoz-García, M. Pavone, P. Vivo
Small (2023)

Full text of article Antimony-Bismuth Alloying: The Key to a Major Boost in the Efficiency of Lead-Free Perovskite-Inspired Photovoltaics

Ex-situ biological hydrogen methanation in trickle bed reactors: Integration into biogas production facilities

D. Kamravamanesh, J. M. Rinta Kanto, H. Ali-Loytty, A. Myllärinen, M. Saalasti, J. Rintala, and M. Kokko,
Chemical Engineering Science 269, 118498 (2023)

Full text of article Ex-situ biological hydrogen methanation in trickle bed reactors: Integration into biogas production facilities

Triple A-site cation mixing in 2D perovskite-inspired antimony halide absorbers for efficient indoor photovoltaics

N. Lamminen, G. K. Grandhi, F. Fasulo, A. Hiltunen, H. Pasanen, M. Liu, B. Al-Anesi, A. Efimov, H. Ali-Löytty, K. Lahtonen, P. Mäkinen, A. Matuhina, A. B. Muñoz-García, M. Pavone, and P. Vivo
Advanced Energy Materials 13(4), 2203175 (2023)

Full text of article Triple A-site cation mixing in 2D perovskite-inspired antimony halide absorbers for efficient indoor photovoltaics

Is carrier mobility a limiting factor for charge transfer in TiO₂/Si devices? A study by transient reflectance spectroscopy

R. Khan, H. P. Pasanen, H. Ali-Löytty, H. M. Ayedh, J. Saari, V. Vähänissi, M. Valden, H. Savin, N. V. Tkachenko
Surfaces and Interfaces 38, 102871 (2023)

Full text of article Is carrier mobility a limiting factor for charge transfer in TiO₂/Si devices? A study by transient reflectance spectroscopy

Surface and optical properties of phase-pure silver iodobismuthate nanocrystals

A. Matuhina, G. K. Grandhi, A. Bergonzoni, L. Pedesseau, R. Grisorio, S. Annurakshita, H. Ali-Löytty, R. Varghese, K. Lahtonen, G. Volonakis, V. Pecunia, G. Bautista, J. Even, and P. Vivo
Nanoscale 15, 14764-14773 (2023)

Full text of article Surface and optical properties of phase-pure silver iodobismuthate nanocrystals

2022

A new user-friendly materials science end station at the FinEstBeAMS beamline of MAX IV

W. Wang, A. Kivimäki, K. Chernenko, R. Pärna, T. Käämbre, E. Kukk, K. Kokko, M. Valden, M. Hirsimäki, M. Kirm, and M. Huttula
Journal of Physics: Conference Series 2380, 012048 (2022)

Full text of article A new user-friendly materials science end station at the FinEstBeAMS beamline of MAX IV

Influence of the photodeposition sequence on the photocatalytic activity of plasmonic Ag–Au/TiO₂ nanocomposites

B. D. Bhuskute, H. Ali-Löytty, M. Honkanen, T. Salminen, and M. Valden
Nanoscale Advances 4, 4335-4343 (2022)

Full text of article Influence of the photodeposition sequence on the photocatalytic activity of plasmonic Ag–Au/TiO₂ nanocomposites

Fractal-like Hierarchical CuO Nano/Microstructures for Large-Surface-to-Volume-Ratio Dip Catalysts

V. Sharma, V. S. Parihar, H. Ali-Löytty, J. Vihinen, D. Ukale, K. Yiannacou, K. Lahtonen, M. Kellomäki, and V. Sariola
ACS Applied Nano Materials 5, 14591–14601 (2022)

Full text of article Fractal-like Hierarchical CuO Nano/Microstructures for Large-Surface-to-Volume-Ratio Dip Catalysts

Low-temperature route to direct amorphous to rutile crystallization of TiO₂ thin films grown by atomic layer deposition

J. Saari, H. Ali-Löytty, K. Lahtonen, M. Hannula, L. Palmolahti, A. Tukiainen, and M. Valden
Journal of Physical Chemistry C 126, 15357-15366 (2022)

Full text of article Low-temperature route to direct amorphous to rutile crystallization of TiO₂ thin films grown by atomic layer deposition

Functionalization of TiO₂ inverse opal structure with atomic layer deposition grown Cu for photocatalytic and antibacterial applications

K. Pham, H. Ali-Löytty, J. Saari, M. Zubair, M. Valden, K. Lahtonen, N. Kinnunen, M. Gunell, and J. J. Saarinen
Optical Materials 131, 112695 (2022)

Full text of article Functionalization of TiO₂ inverse opal structure with atomic layer deposition grown Cu for photocatalytic and antibacterial applications

Pinhole-resistant nanocrystalline rutile TiO₂ photoelectrode coatings

L. Palmolahti, H. Ali-Löytty, M. Hannula, J.Saari, W. Wang, A. Tukiainen, K. Lahtonen, and M. Valden
Acta Materialia 239, 118257 (2022)

Full text of article Pinhole-resistant nanocrystalline rutile TiO₂ photoelectrode coatings

Heparin-Derived Theranostic Nanoprobes Overcome the Blood–Brain Barrier and Target Glioma in Murine Model

S. Samanta, V. Le Joncour, O. Wegrzyniak, V. K. Rangasami, H. Ali-Löytty, T. Hong, R. K. Selvaraju, O. Aberg, J. Hilborn, P. Laakkonen, O. P. Varghese, O. Eriksson, H. Cabral, O. P. Oommen
Advanced Therapeutics 5, 2200001 (2022)

Full text of article Heparin-Derived Theranostic Nanoprobes Overcome the Blood–Brain Barrier and Target Glioma in Murine Model

Enhancing the microstructure of perovskite-inspired Cu-Ag-Bi-I absorber for efficient indoor photovoltaics

G. K. Grandhi, B. Al-Anesi, H. Pasanen, H. Ali-Löytty, K. Lahtonen, S. Granroth, N. Christian, A. Matuhina, M. Liu, A. Berdin, V. Pecunia, and P. Vivo
Small 18, 2203768 (2022)

Full text of article Enhancing the microstructure of perovskite-inspired Cu-Ag-Bi-I absorber for efficient indoor photovoltaics

Tunable Ti³⁺-mediated charge carrier dynamics of atomic layer deposition-grown amorphous TiO₂

J. Saari, H. Ali-Löytty, M. Kauppinen, M. Hannula, R. Khan, K. Lahtonen, L. Palmolahti, A. Tukiainen, H. Groenbeck, N. Tkachenko, and M. Valden
Journal of Physical Chemistry C 126 (9), 4542-4554 (2022)

Full text of article Tunable Ti³⁺-mediated charge carrier dynamics of atomic layer deposition-grown amorphous TiO₂

Low residual dissolved phosphate in spent medium bioleaching enables rapid and enhanced solubilization of rare earth elements from end-of-life NiMH batteries

P. Rasoulnia, R. Barthen, A.-M. Lakaniemi, H. Ali-Löytty, and J. A. Puhakka,
Minerals Engineering 176, 107361 (2022)

Full text of article Low residual dissolved phosphate in spent medium bioleaching enables rapid and enhanced solubilization of rare earth elements from end-of-life NiMH batteries

Moisture-assisted near-UV emission enhancement of lead-free Cs₄CuIn₂Cl₁₂ double perovskite nanocrystals

M. Liu, S. Matta, H. Ali-Löytty, A. Matuhina, G. K. Grandhi, K. Lahtonen, S. Russo, and P. Vivo
Nano Letters 22 (1), 311–318 (2022)

Full text of article Moisture-assisted near-UV emission enhancement of lead-free Cs₄CuIn₂Cl₁₂ double perovskite nanocrystals

2021

Octahedral distortion driven by CsPbI₃ nanocrystals reaction temperature – the effects on phase stability and beyond

A. Matuhina, G. K. Grandhi, M. Liu, J.-H. Smått, N. S. M. Viswanath, H. Ali-Löytty, K. Lahtonen, and P. Vivo
Nanoscale 13 (33), 14186–14196 (2021)

Full text of article Octahedral distortion driven by CsPbI₃ nanocrystals reaction temperature – the effects on phase stability and beyond

Comparison of the heat-treatment effect on carrier dynamics in TiO₂ thin films deposited by different methods

R. Khan, H. Ali-Löytty, A. Tukiainen, and N. Tkachenko
Physical Chemistry Chemical Physics 23, 17672–17682 (2021)

Full text of article Comparison of the heat-treatment effect on carrier dynamics in TiO₂ thin films deposited by different methods

Visible to near-infrared broadband fluorescence from Ce-doped silica fiber

A. Yadav, N. B. Chichkov, R. Gumenyuk, H. Ali-Löytty, K. Lahtonen, M. Valden, M. A. Melkumov, M. V. Yashkov, E. Zherebtsov, and E. U. Rafailov
Optical Materials Express 11 (8), 2528–2538 (2021)

Full text of article Visible to near-infrared broadband fluorescence from Ce-doped silica fiber

Lead-free cesium titanium bromide double perovskite nanocrystals

G. K. Grandhi, A. Matuhina, M. Liu, S. Annurakshita, H. Ali-Löytty, G. Bautista, and P. Vivo
Nanomaterials 11 (6), 1458 (2021)

Full text of article Lead-free cesium titanium bromide double perovskite nanocrystals

Interface engineering of TiO₂ photoelectrode coatings grown by atomic layer deposition on Silicon

J. Saari, H. Ali-Löytty, M. Honkanen, A. Tukiainen, K. Lahtonen, and M. Valden
ACS Omega 6 (41), 27501–27509 (2021)

Full text of article Interface engineering of TiO₂ photoelectrode coatings grown by atomic layer deposition on Silicon

Manganese doping promotes the synthesis of bismuth-based perovskite nanocrystals while tuning their band structures

M. Liu, H. Ali‐Löytty, A. Hiltunen, E. Sarlin, S. Qudsia, J.-H. Smått, M. Valden, P. Vivo
Small 2100101 (2021)

Full text of article Manganese doping promotes the synthesis of bismuth-based perovskite nanocrystals while tuning their band structures

Ultrathin-walled 3D inorganic nanostructured networks templated from crosslinked cellulose nanocrystal aerogels

A. Hiltunen, T. Or, K. Lahtonen, H. Ali-Löytty, N. Tkachenko, M. Valden, E. Sarlin, E. D. Cranston, J. M. Moran-Mirabal, and J. Vapaavuori
Advanced Materials Interfaces 2001181 (2021)

Full text of article Ultrathin-walled 3D inorganic nanostructured networks templated from crosslinked cellulose nanocrystal aerogels

Copper oxide micro-tufts on natural fractals for efficient water harvesting

V. Sharma, H. Ali-Löytty, A. Koivikko, K. Yiannacou, K. Lahtonen, and V. Sariola
Langmuir 37 (11), 3370–3381 (2021)

Full text of article Copper oxide micro-tufts on natural fractals for efficient water harvesting

GaAs surface passivation for InAs/GaAs quantum dot based nanophotonic devices

A. Chellu, E. Koivusalo, M. Raappana, S. Ranta, V. Polojärvi, A. Tukiainen, K. Lahtonen, J. Saari, M. Valden, H. Seppänen, H. Lipsanen, M. Guina, and T. Hakkarainen
Nanotechnology 32 (13), 130001 (2021)

Full text of article GaAs surface passivation for InAs/GaAs quantum dot based nanophotonic devices

2020

Strong, rapid and reversible photochromic response of Nb doped TiO₂ nanocrystal colloids in hole scavenging media

R. Eglītis, U. Joost, A. Zukuls, K. Rubenis, R. Ignatāns, L. Avotiņa, L. Baumane, K. Šmits, M. Hirsimäki, T. Käämbre, and A. Šutka
ACS Applied Materials & Interfaces 12 (51), 57609–57618 (2020)

Full text of article Strong, rapid and reversible photochromic response of Nb doped TiO₂ nanocrystal colloids in hole scavenging media

B-site co-alloying with Germanium improves the efficiency and stability of all-inorganic Tin-based perovskite nanocrystal solar cells

M. Liu, H. Pasanen, H. Ali-Löytty, A. Hiltunen, K. Lahtonen, S. Qudsia, J.-H. Smått, M. Valden, N. Tkachenko, and P. Vivo
Angewandte Chemie International Edition 59, 22117–22125 (2020)

Full text of article B-site co-alloying with Germanium improves the efficiency and stability of all-inorganic Tin-based perovskite nanocrystal solar cells

Gas-phase endstation of electron, ion and coincidence spectroscopies for diluted samples at the FinEstBeAMS beamline of the MAX IV 1.5 GeV storage ring

K. Kooser, A. Kivimäki, P. Turunen, R. Pärna, L. Reisberg, M. Kirm, M. Valden, M. Huttula, and E. Kukk
Journal of Synchrotron Radiation 27, 1080–1091 (2020)

Full text of article Gas-phase endstation of electron, ion and coincidence spectroscopies for diluted samples at the FinEstBeAMS beamline of the MAX IV 1.5 GeV storage ring

Optimization of photogenerated charge carrier lifetimes in ALD grown TiO₂ for photonic applications

R. Khan, H. Ali-Löytty, J. Saari, M. Valden, A. Tukiainen, K. Lahtonen, and N. V. Tkachenko
Nanomaterials 10 (8), 1567 (2020)

Full text of article Optimization of photogenerated charge carrier lifetimes in ALD grown TiO₂ for photonic applications

Modification of surface states of hematite-based photoanodes by submonolayer of TiO₂ for enhanced solar water splitting

L. Palmolahti, H. Ali-Löytty, R. Khan, J. Saari, N. V. Tkachenko, and M. Valden
Journal of Physical Chemistry C 124, 13094–13101 (2020)

Full text of article Modification of surface states of hematite-based photoanodes by submonolayer of TiO₂ for enhanced solar water splitting

Aluminium oxide formation via atomic layer deposition using a polymer brush mediated selective infiltration approach

M. Snelgrove, C. McFeely, P. G. Mani-Gonzalez, K. Lahtonen, R. Lundy, G. Hughes, M. Valden, E. McGlynn, P. Yadav, J. Saari, M. Morris, and R. O'Connor
Applied Surface Science 515, 145987 (2020)

Full text of article Aluminium oxide formation via atomic layer deposition using a polymer brush mediated selective infiltration approach

Negative-ion/positive-ion coincidence spectroscopy as a tool to identify anionic fragments: the case of core-excited CHF₃

A. Kivimäki,C. Stråhlman, R. Sankari, R. Richter
Journal of Mass Spectrometry 55 (5), e4487 (2020)

Full text of article Negative-ion/positive-ion coincidence spectroscopy as a tool to identify anionic fragments: the case of core-excited CHF₃

2019

Chemical dissolution of Pt(111) during potential cycling under negative pH conditions studied by operando X-ray photoelectron spectroscopy

H. Ali-Löytty, M. Hannula, M. Valden, A. Eilert, H. Ogasawara, and A. Nilsson
Journal of Physical Chemistry C 123 (41), 25128–25134 (2019)

Full text of article Chemical dissolution of Pt(111) during potential cycling under negative pH conditions studied by operando X-ray photoelectron spectroscopy

Large-scale efficient water harvesting using bioinspired micro-patterned copper oxide surfaces and guided droplet transport

V. Sharma, K. Yiannacou, M. Karjalainen, K. Lahtonen, M. Valden, and V. Sariola
Nanoscale Advances 1, 4025–4040 (2019)

Full text of article Large-scale efficient water harvesting using bioinspired micro-patterned copper oxide surfaces and guided droplet transport

Influence of ex-situ annealing on the properties of MgF₂ thin films deposited by electron beam evaporation

J. Reuna, V. Polojärvi, P. Pääkkönen, K. Lahtonen, M. Raappana, T. Aho, R. Isoaho, A. Aho, M. Valden, and M. Guina
Optical Materials 96, 109326 (2019)

Full text of article Influence of ex-situ annealing on the properties of MgF₂ thin films deposited by electron beam evaporation

Highly efficient charge separation in model Z-scheme TiO₂/TiSi₂/Si photoanode by micropatterned titanium silicide interlayer

M. Hannula, H. Ali-Löytty, K. Lahtonen, J. Saari, A. Tukiainen, and M. Valden
Acta Materialia 174, 237–245 (2019)

Full text of article Highly efficient charge separation in model Z-scheme TiO₂/TiSi₂/Si photoanode by micropatterned titanium silicide interlayer

Charge carrier dynamics in tantalum oxide overlayered and doped hematite photoanodes

T.-P. Ruoko, A. Hiltunen, T. Iivonen, R. Ulkuniemi, K. Lahtonen, H. Ali-Löytty, M. Valden, M. Leskelä, and N. Tkachenko
Journal of Materials Chemistry A 7, 3206–3215 (2019)

Full text of article Charge carrier dynamics in tantalum oxide overlayered and doped hematite photoanodes

Operando observation of chemical transformations of Iridium oxide during photoelectrochemical water oxidation

L. Li, J. Yang, H. Ali-Löytty, T.-C. Weng, F. M. Toma, D. Sokaras, I. D. Sharp, and A. Nilsson
ACS Applied Energy Materials 2, 1371–1379 (2019)

Full text of article Operando observation of chemical transformations of Iridium oxide during photoelectrochemical water oxidation

Diversity of TiO₂: Controlling the molecular and electronic structure of atomic layer deposited black TiO₂

H. Ali-Löytty, M. Hannula, J. Saari, L. Palmolahti, B. Bhuskute, R. Ulkuniemi, T. Nyyssönen, K. Lahtonen, and M. Valden
ACS Applied Materials & Interfaces 11, 2758–2762 (2019)

Full text of article Diversity of TiO₂: Controlling the molecular and electronic structure of atomic layer deposited black TiO₂

2018

DLC-treated aramid-fibre composites: tailoring nanoscale-coating for macroscale performance

M. Kanerva, S. Korkiakoski, K. Lahtonen, J. Jokinen, E. Sarlin, S. Palola, A. Iyer, P. Laurikainen, X. W. Liu, M. Raappana, S. Tervakangas, and M. Valden
Composites Science and Technology 171, 62–69 (2018)

Full text of article DLC-treated aramid-fibre composites: tailoring nanoscale-coating for macroscale performance

Reversible photodoping of TiO₂ nanoparticles for photochromic applications

U. Joost, A. Šutka, M. Oja, K. Smits, N. Döbelin, A. Loot, M. Järvekülg, M. Hirsimäki, M. Valden, and E. Nõmmiste
Chemistry of Materials 30(24), 8968–8974 (2018)

Full text of article Reversible photodoping of TiO₂ nanoparticles for photochromic applications

Solvothermal synthesis derived Co-Ga codoped ZnO diluted magnetic degenerated semiconductor nanocrystals

A. Šutka, T. Käämbre, U. Joost, K. Kooser, M. Kook, R. F. Duarte, V. Kisand, M. Maiorov, N. Döbelin, K. Smits
Journal of Alloys and Compounds 763, 164–172 (2018)

Full text of article Solvothermal synthesis derived Co-Ga codoped ZnO diluted magnetic degenerated semiconductor nanocrystals

Design aspects of all atomic layer deposited TiO₂-Fe₂O₃ scaffold-absorber photoanodes for water splitting

A. Hiltunen, T.-P. Ruoko, T. Iivonen, K. Lahtonen, H. Ali-Löytty, E. Sarlin, M. Valden, M. Leskelä, and N. Tkachenko
Sustainable Energy & Fuels 2, 2124–2130 (2018)

Full text of article Design aspects of all atomic layer deposited TiO₂-Fe₂O₃ scaffold-absorber photoanodes for water splitting

Fabrication of ultrathin multilayered superomniphobic nanocoatings by liquid flame spray, atomic layer deposition and silanization

M. Sorvali, L. Vuori, M. Pudas, J. Haapanen, R. Mahlberg, H. Ronkainen, M. Honkanen, M. Valden, and J. Mäkelä
Nanotechnology 29, 185708 (2018)

Full text of article Fabrication of ultrathin multilayered superomniphobic nanocoatings by liquid flame spray, atomic layer deposition and silanization

Improved stability of ALD grown amorphous TiO₂ photoelectrode coatings by thermally induced oxygen defects

M. Hannula, H. Ali-Löytty, K. Lahtonen, E. Sarlin, J. Saari, and M. Valden
Chemistry of Materials 30(4), 1199–1208 (2018)

Full text of article Improved stability of ALD grown amorphous TiO₂ photoelectrode coatings by thermally induced oxygen defects

Switchable light reflectance in dilute magneto-optical colloids based on nickel ferrite nanowires

A. Šutka, M. Timusk, U. Joost, R. Ignatans, and M. Maiorov
e-Journal of Surface Science and Nanotechnology 16, 119–121 (2018)

Full text of article Switchable light reflectance in dilute magneto-optical colloids based on nickel ferrite nanowires

Aqueous synthesis of Z-Scheme photocatalyst powders and thin-film photoanodes from earth abundant elements

A. Šutka, M. Vanags, U. Joost, K. Šmits, J. Ruža, J. Ločs, J. Kleperis, and T. Juhna
Journal of Environmental Chemical Engineering 6 (2), 2606–2615 (2018)

Full text of article Aqueous synthesis of Z-Scheme photocatalyst powders and thin-film photoanodes from earth abundant elements

The role of (FeCrSi)₂(MoNb)-type Laves phase on the formation of Mn-rich protective oxide scale on ferritic stainless steel

H. Ali-Löytty, M. Hannula, T. Juuti, Y. Niu, A. A. Zakharov, and M. Valden
Corrosion Science 132, 214–222 (2018)

Full text of article The role of (FeCrSi)₂(MoNb)-type Laves phase on the formation of Mn-rich protective oxide scale on ferritic stainless steel

Humidity influence on optical properties of nanowire colloids with modulated visual response to electrostatic charge

A. Šutka, U. Joost, M. Järvekülg, and M. Timusk
Colloid and Interface Science Communications 22, 34–37 (2018)

Full text of article Humidity influence on optical properties of nanowire colloids with modulated visual response to electrostatic charge

2017

High-power 1180 nm GaInNAs DBR laser diodes

A. T. Aho, J. Viheriälä, V.-M. Korpijärvi, M. Koskinen, H. Virtanen, M. Christensen, T. Uusitalo, K. Lahtonen, M. Valden, and M. Guina
IEEE Photonics Technology Letters 29(23), 2023–2026 (2017)

Full text of article High-power 1180 nm GaInNAs DBR laser diodes

FinEstBeaMS - a wide-range Finnish-Estonian beamline for materials science at the 1.5 GeV storage ring at the MAX IV Laboratory

R. Pärna, R. Sankari, E. Kukk, E. Nõmmiste, M. Valden, M. Lastusaari, K. Kooser, K. Kokko, M. Hirsimäki, S. Urpelainen, P. Turunen, A. Kivimäki, V. Pankratov, L. Reisberg, F. Hennies, H. Tarawneh, R. Nyholm, and M. Huttula
Nuclear Instruments and Methods in Physics Research A: Accelerators, Spectrometers, Detectors and Associated Equipment 859, 83–89 (2017)

Full text of article FinEstBeaMS - a wide-range Finnish-Estonian beamline for materials science at the 1.5 GeV storage ring at the MAX IV Laboratory

Building up colors: multilayered arrays of peryleneimides on flat surfaces and on mesoporous layers

L. George, E. Efimova, E. Sariola-Leikas, K. Lahtonen, M. Valden, P. Vivo, H. Hakola, A. Hiltunen, and A. Efimov
ChemPlusChem 82, 1–12 (2017)

Full text of article Building up colors: multilayered arrays of peryleneimides on flat surfaces and on mesoporous layers

Investigation of the structural anisotropy in a self-assembling glycinate layer on Cu(100) by scanning tunneling microscopy and density functional theory calculations

M. Kuzmin, K. Lahtonen, L. Vuori, R. Sánchez-de-Armas, M. Hirsimäki, and M. Valden
Applied Surface Science 409, 111–116 (2017)

Full text of article Investigation of the structural anisotropy in a self-assembling glycinate layer on Cu(100) by scanning tunneling microscopy and density functional theory calculations

Hot dip galvanized steel by nanomolecular silane layers as hybrid interface between zinc and top coatings

L. Vuori, H. Ali-Löytty, K. Lahtonen, M. Hannula, E. Lehtonen, Y. R. Niu, and M. Valden
Corrosion 73(2), 169–180 (2017)

Full text of article Hot dip galvanized steel by nanomolecular silane layers as hybrid interface between zinc and top coatings

Tailored fabrication of transferable and hollow weblike titanium dioxide structures

A. Hiltunen, K. Lahtonen, J. Saari, A. Ojanperä, E. Sarlin, H. Wondraczek, A. Efimov, K. Kaunisto, P. Vivo, C. Maccato, D. Barreca, P. Fardim, N. Tkachenko, M. Valden, and H. Lemmetyinen
ChemPhysChem 18, 64–71 (2017)

Full text of article Tailored fabrication of transferable and hollow weblike titanium dioxide structures

2016

UPS and DFT investigation of the electronic structure of gas-phase trimesic acid

L. Reisberg, R. Pärna, A. Kikas, I. Kuusik, V. Kisand, M. Hirsimäki, M. Valden, and E. Nõmmiste
Journal of Electron Spectroscopy and Related Phenomena 213, 11–16 (2016)

Full text of article UPS and DFT investigation of the electronic structure of gas-phase trimesic acid

Grain orientation dependent Nb–Ti microalloying mediated surface segregation on ferritic stainless steel

H. Ali-Löytty, M. Hannula, M. Honkanen, K. Östman, K. Lahtonen, and M. Valden
Corrosion Science 112, 204–213 (2016)

Full text of article Grain orientation dependent Nb–Ti microalloying mediated surface segregation on ferritic stainless steel

Improved antifouling properties and selective biofunctionalization of stainless steel by employing heterobifunctional silane-polyethylene glycol overlayers and avidin-biotin technology

V. Hynninen, L. Vuori, M. Hannula, K. Tapio, K. Lahtonen, T. Isoniemi, E. Lehtonen, M. Hirsimäki, J. J. Toppari, M. Valden, and V. Hytönen
Scientific Reports 6, 29324 (2016)

Full text of article Improved antifouling properties and selective biofunctionalization of stainless steel by employing heterobifunctional silane-polyethylene glycol overlayers and avidin-biotin technology

Fabrication of topographically microstructured titanium silicide interface for advanced photonic applications

M. Hannula, K. Lahtonen, H. Ali-Löytty, A. A. Zakharov, T. Isotalo, J. Saari, and M. Valden
Scripta Materialia 119, 76 (2016)

Full text of article Fabrication of topographically microstructured titanium silicide interface for advanced photonic applications

Ambient-pressure XPS study of a Ni–Fe electrocatalyst for the oxygen evolution reaction

H. Ali-Löytty, M. W. Louie, M. R. Singh, L. Li, H. G. Sanchez Casalongue, H. Ogasawara, E. J. Crumlin, Z. Liu, A. T. Bell, A. Nilsson, and D. Friebel
Journal of Physical Chemistry C 120 (4), 2247 (2016)

Full text of article Ambient-pressure XPS study of a Ni–Fe electrocatalyst for the oxygen evolution reaction

Color bricks: Building highly organized and strongly absorbing multicomponent arrays of terpyridyl perylenes on metal oxide surfaces

E. Sariola-Leikas, Z. Ahmed, P. Vivo, A. Ojanperä, K. Lahtonen, J. Saari, M. Valden, H. Lemmetyinen, and A. Efimov
Chemistry - A European Journal 22, 1501 (2016)

Full text of article Color bricks: Building highly organized and strongly absorbing multicomponent arrays of terpyridyl perylenes on metal oxide surfaces

2015

Thermal management in long-wavelength flip-chip semiconductor disk lasers

A. Rantamäki, E. J. Saarinen, J. Lyytikäinen, J. Heikkinen, J. M. Kontio, K. Lahtonen, M. Valden, and O. G. Okhotnikov
IEEE Journal of Selected Topics in Quantum Electronics 21, 1501507 (2015)

Full text of article Thermal management in long-wavelength flip-chip semiconductor disk lasers

Towards high power flip-chip long-wavelength semiconductor disk lasers

A. Rantamäki, E. J. Saarinen, J. Lyytikäinen, J. M. Kontio, J. Heikkinen, K. Lahtonen, M. Valden, and O. G. Okhotnikov
Proceedings of SPIE vol. 9349 (2015)

Full text of article Towards high power flip-chip long-wavelength semiconductor disk lasers

2014

Ormocomp® -modified glass as culture substratum for human embryonic stem cell-derived retinal pigment epithelial cells

E. Käpylä, A. Sorkio, S. Teymouri, K. Lahtonen, L. Vuori, M. Valden, H. Skottman, M. Kellomäki, and K. Juuti-Uusitalo
Langmuir 30, 14555 (2014)

Full text of article Ormocomp® -modified glass as culture substratum for human embryonic stem cell-derived retinal pigment epithelial cells

Controlling the synergetic effects in (3-aminopropyl) trimethoxysilane and (3-mercaptopropyl) trimethoxysilane coadsorption on stainless steel surfaces

L. Vuori, M. Hannula, K. Lahtonen, P. Jussila, H. Ali-Löytty, M. Hirsimäki, R. Pärna, E. Nõmmiste, and M. Valden
Applied Surface Science 317, 856 (2014)

Full text of article Controlling the synergetic effects in (3-aminopropyl) trimethoxysilane and (3-mercaptopropyl) trimethoxysilane coadsorption on stainless steel surfaces

Biofunctional hybrid materials: bimolecular organosilane monolayers on FeCr alloys

L. Vuori, J. Leppiniemi, M. Hannula, K. Lahtonen, M. Hirsimäki, L. Costelle, E. Nõmmiste, V. Hytönen, and M. Valden
Nanotechnology 25, 435603 (2014)

Full text of article Biofunctional hybrid materials: bimolecular organosilane monolayers on FeCr alloys

Anodic oxidation of ultra-thin Ti layers on ITO substrates and their application in organic electronic memory elements

P. S. Heljo, K. Wolff, K. Lahtonen, M. Valden, P. Berger, H. S. Majumdar, and D. Lupo
Electrochimica Acta 137, 91 (2014)

Full text of article Anodic oxidation of ultra-thin Ti layers on ITO substrates and their application in organic electronic memory elements

Effect of plasma treated Ag/indium tin oxide anode modification on stability of polymer solar cells

B. Augustine, R. Sliz, K. Lahtonen, M. Valden, R. Myllylä, and T. Fabritius
Solar Energy Materials and Solar Cells 128, 330 (2014)

Full text of article Effect of plasma treated Ag/indium tin oxide anode modification on stability of polymer solar cells

High power semiconductor disk laser with a semiconductor-dielectric-metal compound mirror

A. Rantamäki, E. J. Saarinen, J. Lyytikäinen, K. Lahtonen, M. Valden, and O.G. Okhotnikov
Applied Physics Letters 104, 101110 (2014)

Full text of article High power semiconductor disk laser with a semiconductor-dielectric-metal compound mirror

2013

In situ XPS studies of electrochemically negatively polarized molybdenum carbide derived carbon double layer capacitor electrode

A. Tonisoo, J. Kruusma, R. Pärna, A. Kikas, M. Hirsimäki, E. Nõmmiste, and E. Lust
Journal of the Electrochemical Society 160(8), A1084 (2013)

Full text of article In situ XPS studies of electrochemically negatively polarized molybdenum carbide derived carbon double layer capacitor electrode

Optimization of the electrical properties of Ti–Nb stabilized ferritic stainless steel SOFC interconnect alloy upon high-temperature oxidation: The role of excess Nb on the interfacial oxidation at the oxide–metal interface

H. Ali-Löytty, P. Jussila, and M. Valden
International Journal of Hydrogen Energy 38(2), 1039 (2013)

Full text of article Optimization of the electrical properties of Ti–Nb stabilized ferritic stainless steel SOFC interconnect alloy upon high-temperature oxidation: The role of excess Nb on the interfacial oxidation at the oxide–metal interface

2012

Influence of precipitation on initial high-temperature oxidation of Ti-Nb stabilized ferritic stainless steel SOFC interconnect alloy

H. Ali-Löytty, P. Jussila, T. Juuti, L. P. Karjalainen, A. A. Zakharov, and M. Valden
International Journal of Hydrogen Energy 37(19), 14528 (2012)

Full text of article Influence of precipitation on initial high-temperature oxidation of Ti-Nb stabilized ferritic stainless steel SOFC interconnect alloy

Nanoscale surface properties of a Ni-Mn-Ga 10M magnetic shape memory alloy

I. Aaltio, X. W. Liu, M. Valden, K. Lahtonen, O. Söderberg, Y. Ge, and S.-P. Hannula
Journal of Alloys and Compounds 577, S367 (2012)

Full text of article Nanoscale surface properties of a Ni-Mn-Ga 10M magnetic shape memory alloy

Effect of different annealing temperatures and SiO₂/Si(100) substrate on the properties of nickel containing titania thin sol-gel films

R. Pärna, U. Joost, E. Nõmmiste, T. Käämbre, A. Kikas, I. Kuusik, I. Kink, M. Hirsimäki, and V. Kisand
Physica Status Solidi (a) 209, 953 (2012)

Full text of article Effect of different annealing temperatures and SiO₂/Si(100) substrate on the properties of nickel containing titania thin sol-gel films

2011

Adsorption structure and bonding of trimesic acid on Cu(100)

L. Kanninen, N. Jokinen, H. Ali-Löytty, P. Jussila, K. Lahtonen, M. Hirsimäki, M. Kuzmin, R. Pärna, E. Nõmmiste, and M. Valden
Surface Science 605, 1968-1978 (2011)

Full text of article Adsorption structure and bonding of trimesic acid on Cu(100)

Effect of dielectric barrier on rectification, injection and transport properties of printed organic diodes

K. E. Lilja, H. S. Majumdar, K. Lahtonen, P. Heljo, S. Tuukkanen, T. Joutsenoja, M. Valden, R. Österbacka, and D. Lupo
Journal of Physics D: Applied Physics 44, 295301 (2011)

Full text of article Effect of dielectric barrier on rectification, injection and transport properties of printed organic diodes

Characterization of silane layers on modified stainless steel surfaces and related stainless steel-plastic hybrids

M. Honkanen, M. Hoikkanen, M. Vippola, J. Vuorinen, P. Jussila, H. Ali-Löytty, M. Lampimäki, M. Valden, and T. Lepistö
Applied Surface Science 257, 9335-9346 (2011)

Full text of article Characterization of silane layers on modified stainless steel surfaces and related stainless steel-plastic hybrids

Influence of CrN surface compound on the initial stages of high temperature oxidation of ferritic stainless steel

H. Ali-Löytty, P. Jussila, M. Hirsimäki, and M. Valden
Applied Surface Science 257, 7783-7791 (2011)

Full text of article Influence of CrN surface compound on the initial stages of high temperature oxidation of ferritic stainless steel

Effect of cobalt doping and annealing on properties of titania thin films prepared by sol-gel process

R. Pärna, U. Joost, E. Nõmmiste, T. Käämbre, A. Kikas, I. Kuusik, M. Hirsimäki, I. Kink, and V. Kisand
Applied Surface Science 257, 6897-6907 (2011)

Full text of article Effect of cobalt doping and annealing on properties of titania thin films prepared by sol-gel process

The effect of iridium precursor on oxide-supported iridium catalysts prepared by atomic layer deposition

H. Vuori, A. Pasanen, M. Lindblad, M. Valden, M. Veringa Niemelä, and A. O. I. Krause
Applied Surface Science 257, 4204-4210 (2011)

Full text of article The effect of iridium precursor on oxide-supported iridium catalysts prepared by atomic layer deposition

2010

Electron spectroscopic study of passive oxide layer formation on Fe-19Cr-18Ni-1Al-TiC austenitic stainless steel

R. Pärna, E. Nõmmiste, A. Kikas, P. Jussila, M. Hirsimäki, M. Valden, and V. Kisand
Journal of Electron Spectroscopy and Related Phenomena 182, 108-114 (2010)

Full text of article Electron spectroscopic study of passive oxide layer formation on Fe-19Cr-18Ni-1Al-TiC austenitic stainless steel

Effect of surface hydroxyl concentration on the bonding and morphology of aminopropylsilane thin films on austenitic stainless steel

P. Jussila, H. Ali-Löytty, K. Lahtonen, M. Hirsimäki, and M. Valden
Surface and Interface Analysis 42, 157-164 (2010)

Full text of article Effect of surface hydroxyl concentration on the bonding and morphology of aminopropylsilane thin films on austenitic stainless steel

2009

Inhibition of initial surface oxidation by strongly bound hydroxyl species and Cr segregation: H₂O and O₂ adsorption on Fe-17Cr

P. Jussila, H. Ali-Löytty, K. Lahtonen, M. Hirsimäki, and M. Valden
Surface Science 603, 3005-3010 (2009)

Full text of article Inhibition of initial surface oxidation by strongly bound hydroxyl species and Cr segregation: H₂O and O₂ adsorption on Fe-17Cr

2008

Kinetic hindrance during the surface oxidation of Cu(100)-c(10×2)-Ag

K. Lahtonen, M. Lampimäki, M. Hirsimäki, and M. Valden
Journal of Chemical Physics 129, 194707 (2008)

Full text of article Kinetic hindrance during the surface oxidation of Cu(100)-c(10×2)-Ag

Oxygen adsorption-induced nanostructures and island formation on Cu{100}: Bridging the gap between the formation of surface confined oxygen chemisorption layer and oxide formation

K. Lahtonen, M. Hirsimäki, M. Lampimäki, and M. Valden
Journal of Chemical Physics 129, 124703 (2008)

Full text of article Oxygen adsorption-induced nanostructures and island formation on Cu{100}: Bridging the gap between the formation of surface confined oxygen chemisorption layer and oxide formation

Adsorption dynamics of O₂ on Cu(100): the role of vacancies, steps and adatoms in dissociative chemisorption of O₂

M. Ahonen, M. Hirsimäki, A. Puisto, S. Auvinen, M. Valden, and M. Alatalo
Chemical Physics Letters 456, 211-214 (2008)

Full text of article Adsorption dynamics of O₂ on Cu(100): the role of vacancies, steps and adatoms in dissociative chemisorption of O₂

Influence of minor alloying elements on the initial stages of oxidation of austenitic stainless steel materials

P. Jussila, K. Lahtonen, M. Lampimäki, M. Hirsimäki, and M. Valden
Surface and Interface Analysis 40, 1149-1156 (2008)

Full text of article Influence of minor alloying elements on the initial stages of oxidation of austenitic stainless steel materials

Ag/Cu(100) surface alloy and polycrystalline Cu(Ag) alloy studied by XPS

P. Jussila, K. Lahtonen, M. Lampimäki, M. Hirsimäki, M. Honkanen, T. Lepistö, P. Taskinen, and M. Valden
Surface Science Spectra 15, 31-40 (2008)

Full text of article Ag/Cu(100) surface alloy and polycrystalline Cu(Ag) alloy studied by XPS

Substrate-induced effects in the creation and decay of potassium 2p core excitations in ultrathin films of KCl on copper

V. Kisand, A. Kikas, E. Kukk, E. Nõmmiste, K. Kooser, T. Käämbre, R. Ruus, M. Valden, M. Hirsimäki, P. Jussila, M. Lampimäki, H. Aksela, and S. Aksela
Journal of Physics: Condensed matter 20, 145206 (2008)

Full text of article Substrate-induced effects in the creation and decay of potassium 2p core excitations in ultrathin films of KCl on copper

2007

Oxidation induced nanostructures on Cu{100}, Cu(Ag) and Ag/Cu{100} studied by photoelectron spectroscopy

M. Lampimäki, K. Lahtonen, M. Hirsimäki, and M. Valden
Surface and Interface Analysis 39(4), 359-366 (2007)

Full text of article Oxidation induced nanostructures on Cu{100}, Cu(Ag) and Ag/Cu{100} studied by photoelectron spectroscopy

Substrate-induced effects in the creation and decay of core excitations in ultrathin films of potassium chloride on copper

V. Kisand, A. Kikas, K. Kooser, T. Käämbre, E. Nõmmiste, R. Ruus, M. Hirsimäki, P. Jussila, M. Lampimäki, and M. Valden
Journal of Electron Spectroscopy and Related Phenomena 156-158, 294-298 (2007)

Full text of article Substrate-induced effects in the creation and decay of core excitations in ultrathin films of potassium chloride on copper

Morphology and composition of nanoscale oxides on Fe-20Cr-18Ni{111} austenitic stainless steel

K. Mansikkamäki, U. Haapanen, C. Johans, K. Kontturi, and M. Valden
Journal of the Electrochemical Society 153(8), B311-B318 (2006)

Full text of article Morphology and composition of nanoscale oxides on Fe-20Cr-18Ni{111} austenitic stainless steel

Adsorption and diffusion dynamics of atomic and molecular oxygen on reconstructed Cu(100)

S. Jaatinen, J. Blomqvist, P. Salo, A. Puisto, M. Alatalo, M. Hirsimäki, M. Ahonen, and M. Valden
Physical Review B 75, 075402 (2007)

Full text of article Adsorption and diffusion dynamics of atomic and molecular oxygen on reconstructed Cu(100)

Nanoscale oxidation of Cu(100): Oxide morphology and surface reactivity

M. Lampimäki, K. Lahtonen, M. Hirsimäki, and M. Valden
Journal of Chemical Physics 126, 034703 (2007)

Full text of article Nanoscale oxidation of Cu(100): Oxide morphology and surface reactivity

2006

Pintatieteen tutkimusta aika- ja kokoskaalat yhdistäen

M. Valden
Arkhimedes 6, 14-18 (2006)

Instrumentation and analytical methods of an x-ray photoelectron spectroscopy–scanning tunneling microscopy surface analysis system for studying nanostructured materials

M. Hirsimäki, M. Lampimäki, K. Lahtonen, I. Chorkendorff, and M. Valden
Surface Science 583(2-3), 157-165 (2005)

Full text of article Instrumentation and analytical methods of an x-ray photoelectron spectroscopy–scanning tunneling microscopy surface analysis system for studying nanostructured materials

Rh oxide reducibility and catalytic activity of model Pt-Rh catalysts

A. Suopanki, R. Polvinen, M. Valden, and M. Härkönen
Catalysis Today 100(3-4), 327-330 (2005)

Full text of article Rh oxide reducibility and catalytic activity of model Pt-Rh catalysts