M
Mika Valden
Researcher at Tampere University of Technology
Publications - 116
Citations - 6337
Mika Valden is an academic researcher from Tampere University of Technology. The author has contributed to research in topics: X-ray photoelectron spectroscopy & Adsorption. The author has an hindex of 26, co-authored 107 publications receiving 5824 citations. Previous affiliations of Mika Valden include Ben-Gurion University of the Negev & Texas A&M University.
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Journal ArticleDOI
Reactivity of Pd/Al2O3, Pd/La2O3–Al2O3and Pd/LaAlO3Catalysts for the Reduction of NO by CO: CO and NO Adsorption
Mika Valden,Riitta L. Keiski,N. Xiang,J. Pere,J. Aaltonen,M. Pessa,Teuvo Maunula,A. Savimäki,Antti Lahti,M. Härkönen +9 more
TL;DR: In this article, the effect of the chemical state of Pd on adsorption and thermal properties of CO and NO were investigated by temperature-programmed desorption (TPD) and Fourier transform infrared spectroscopy (FT-IR).
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B-Site Co-Alloying with Germanium Improves the Efficiency and Stability of All-Inorganic Tin-Based Perovskite Nanocrystal Solar Cells.
Maning Liu,Hannu P. Pasanen,Harri Ali-Löytty,Arto Hiltunen,Kimmo Lahtonen,Syeda Qudsia,Jan-Henrik Smått,Mika Valden,Nikolai V. Tkachenko,Paola Vivo +9 more
TL;DR: The partial replacement of Sn atoms by Ge atoms in the nanostructures effectively fills the high density of Sn vacancies, reducing the surface traps and leading to a longer excitonic lifetime and increased photoluminescence quantum yield.
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Reversible Photodoping of TiO2 Nanoparticles for Photochromic Applications
Urmas Joost,Andris Šutka,Andris Šutka,Marek Oja,Krisjanis Smits,Nicola Döbelin,Ardi Loot,Martin Järvekülg,M. Hirsimäki,Mika Valden,Ergo Nõmmiste +10 more
TL;DR: In this article, the photochromic effect of crystalline TiO2 quantum dots (mean size ≈ 4 nm) was investigated and the synthesized quantum dots consist of irregularly shaped anatase TiO 2 nanoparticl...
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Effect of ageing atmosphere on the deactivation of Pd/Rh automotive exhaust gas catalysts: catalytic activity and XPS studies
Ulla Lassi,R Polvinen,S. Suhonen,K Kallinen,A. Savimäki,M. Härkönen,Mika Valden,Riitta L. Keiski +7 more
TL;DR: In this article, the catalytic activity and thermal stability of metallic Pd and Rh catalysts have been examined under different ageing atmospheres, and it was shown that thermal treatment under the reducing and oxidising ageing atmosphere strongly affected catalyst stability in terms of surface areas and the changes observed in the chemical states of active metals.
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Adsorption of Benzotriazole on the Surface of Copper Alloys Studied by SECM and XPS
TL;DR: In this paper, the formation of inhibitive benzotriazole films on copper and copper alloyed with silver has been studied with scanning electrochemical microscopy SECM and X-ray photoelectron spectroscopy XPS.