Výsledky vyhledávání - "Ville Kekkonen"

Characterization of WO3 thin films prepared by picosecond laser deposition for gas sensing

Autor: Nicolae Barsan, Ville Kekkonen, Helmut Seidel, Andreas Krauß, Elisabeth M. Preiß

Publikováno v: Sensors and Actuators B: Chemical. 248:153-159

In this study we report on an investigation of the gas sensing properties of WO 3 thin films deposited by ps-pulsed laser deposition. Morphological, electrical and gas sensing properties with respect to CO and NO 2 are compared, for different layers

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::96cc240f225a8d22725790887c277e34
https://doi.org/10.1016/j.snb.2017.03.096

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Pulsed laser deposition of metal oxide nanostructures for highly sensitive gas sensor applications

Autor: M. Leidinger, Tilman Sauerwald, Jari Liimatainen, Jyrki Lappalainen, Ville Kekkonen, Joni Huotari, Tomi Haapalainen, Jarkko Puustinen

Publikováno v: Sensors and Actuators B: Chemical. 236:978-987

Nanosecond and picosecond pulsed laser deposition (PLD) was used to prepare metal oxide nanostructures with different morphologies as gas sensing materials on top of oxidized silicon substrates and commercial SGX Sensortech SA MEMS microheater platfo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::22f6353e97a6c09f42e2fe30d85acbe7
https://doi.org/10.1016/j.snb.2016.04.060

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Pulsed Laser Deposition for Improved Metal-oxide Gas Sensing Layers

Autor: Joni Huotari, Jarkko Puustinen, Jyrki Lappalainen, Jari Liimatainen, Ville Kekkonen

Publikováno v: Procedia Engineering. 168:1066-1069

Pulsed laser deposition (PLD) with nanosecond and picosecond lasers has been used to deposit novel nanostructured gas sensitive WO 3 , SnO 2 layers, and V 2 O 5 layers, with and without noble metal additives, on SGX Sensortech SA MEMS microheater pla

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f0d33c306e6f9a17af7733365c7cd18d
https://doi.org/10.1016/j.proeng.2016.11.341

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In situ deformation of nanocrystalline Al2O3 thin films at room temperature

Autor: Turkka Salminen, Jari Liimatainen, Erkki Levänen, Francisco Garcia, Ville Kekkonen, Fabio Di Fonzo, Karine Masenelli-Varlot, Saumyadip Chaudhuri, Lucile Joly-Pottuz, Bérangère Lesaint, Erkka Frankberg, Thierry Douillard

Publikováno v: European Microscopy Congress
European Microscopy Congress, Aug 2016, Lyon, France. ⟨10.1002/9783527808465.EMC2016.4913⟩

International audience

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9300ad7f09668801e62ebc3a9f79892
https://doi.org/10.1002/9783527808465.emc2016.4913

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Picosecond pulsed laser deposition of metal-oxide sensing layers with controllable porosity for gas sensor applications

Autor: Ville Kekkonen, Santhosh Kumar Pandian, Aleksey Zolotukhin, Juho Kaisto, Jarkko Piirto, Jari Liimatainen, Mikael Siltanen, Saumyadip Chaudhuri, Fergus Clarke

Publikováno v: Applied Physics A. 122

Recent results of properties and performance of $$\hbox {WO}_3$$ gas sensing layers produced by industrial picosecond pulsed laser deposition process developed by Picodeon Ltd Oy are presented in this paper. $$\hbox {WO}_3$$ layers with controllable

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::88cedf33222c3fe6d2e20ca09aff8a41
https://doi.org/10.1007/s00339-016-9760-0

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Pulsed laser deposition using diffractively shaped excimer-laser beams

Autor: Ville Kekkonen, Jari Likonen, Timo Kajava, Antti Hakola, Yanling Ge

Publikováno v: Kekkonen, V, Hakola, A, Likonen, J, Ge, Y & Kajava, T 2012, ' Pulsed laser deposition using diffractively shaped excimer-laser beams ', Applied Physics A: Materials Science and Processing, vol. 108, no. 2, pp. 423-430 . https://doi.org/10.1007/s00339-012-6904-8

Controlling laser-pulse parameters is an important issue in pulsed laser deposition (PLD). In particular, homogenization of laser beams improves the reproducibility of the PLD process by guaranteeing a uniform intensity distribution and a well-define

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::455003eb7f0fa7536678d7a2f0cd9fa4
https://cris.vtt.fi/en/publications/ccdf2b94-067d-4d31-a282-31399d0407ac

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Substrate-free structures of iron-doped Ni-Mn-Ga thin films prepared by pulsed laser deposition

Autor: Antti Hakola, Oleg Heczko, Akusti Jaatinen, Ville Kekkonen, Timo Kajava

Publikováno v: Journal of Physics: Conference Series. 59:122-125

We discuss the preparation of thin films of ferromagnetic shape-memory Ni-Mn-Ga alloys on NaCl using pulsed laser deposition and present a simple way to release the film from its substrate and to realize free-standing Ni-Mn-Ga structures.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1ceec98a9951007df974d87e361b0d66
https://doi.org/10.1088/1742-6596/59/1/026

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Self-erasing and rewritable wettability patterns on ZnO thin films

Autor: Elina Sahramo, Jari Malm, Maarit Karppinen, Robin H. A. Ras, Antti Hakola, Ville Kekkonen, Timo Kajava

Publikováno v: Kekkonen, V, Hakola, A, Kajava, T, Sahramo, E, Malm, J, Karppinen, M & Ras, R H A 2010, ' Self-erasing and rewritable wettability patterns on ZnO thin films ', Applied Physics Letters, vol. 97, 44102 . https://doi.org/10.1063/1.3460915

Self-erasing patterns allow a substrate to be patterned multiple times or could store temporary information for secret communications, and are mostly based on photochromic molecules to change the color of the pattern. Herein we demonstrate self-erasi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f70299bdaaf8e8114adfd512505637d6
http://juuli.fi/Record/0338237910

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Diffractive shaping of excimer-laser beams for pulsed laser deposition

Autor: Ville Kekkonen, Timo Kajava, Antti Hakola

Publikováno v: Kekkonen, V, Hakola, A & Kajava, T 2011, ' Diffractive shaping of excimer-laser beams for pulsed laser deposition ', Journal of the European Optical Society: Rapid Publications, vol. 6, 11013 . https://doi.org/10.2971/jeos.2011.11013s

We present a beam-shaping system for a pulsed laser deposition setup. This system is based on two diffractive beam-splitter gratings and is able to produce 2*2-mm2 flat-top distributions of UV light with a fluence of 3 J/cm2 on the target some 30 cm

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b22073c24045c7c79c2ccf1c3dfcf2d5
https://doi.org/10.2971/jeos.2011.11013s

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