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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Llobet, Eduard
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2024Room-Temperature Ammonia Sensing Using Polyaniline-Coated Laser-Induced Graphenecitations
- 2024Porous-anodic-alumina-templated Ta-Nb-alloy oxide coatings via the magnetron-sputtering anodizing as novel 3D nanostructured electrodes for energy-storage applicationscitations
- 2024Graphene Decorated With Mo3S7 Clusters for Sensing CO2
- 2023Hydrogen Sensing Mechanism of WS2 Gas Sensors Analyzed with DFT and NAP-XPScitations
- 2023Hydrogen Sensing Mechanism of WS2 Gas Sensors Analyzed with DFT and NAP-XPScitations
- 2023Se-doped Nb2O5-Al2O3 composite-ceramic nanoarrays via the anodizing of Al/Nb bilayer in selenic acidcitations
- 2021Metal-substrate-supported tungsten-oxide nanoarrays via porous-alumina-assisted anodization: from nanocolumns to nanocapsules and nanotubes ; Nanouspořádané pole oxidů wolframu na kovovém substrátu vyrobené pomocí anodizace přes porézní aluminu: od nanosloupků po nanokaplsa a nanotrubkycitations
- 2021FUNCTIONAL NICKEL COATINGS AIMED AT SURFACE DEFECT MITIGATION IN ADDITIVELY MANUFACTURED PARTS OBTAINED BY ELECTRODEPOSITION
- 2015Aerosol-assisted CVD-grown WO₃ nanoneedles decorated with copper oxide nanoparticles for the selective and humidity-resilient detection of H₂Scitations
- 2014Gas sensing with gold-decorated vertically aligned carbon nanotubescitations
- 2014Boron- and nitrogen-doped multi-wall carbon nanotubes for gas detectioncitations
- 2013Single-step deposition of au- and pt-nanoparticle-functionalized tungsten oxide nanoneedles synthesized via aerosol-assisted CVD, and used for fabrication of selective gas microsensor arrayscitations
- 2012Gold clusters on WO 3 nanoneedles grown via AACVD: XPS and TEM studiescitations
- 2011Gas sensing with au-decorated carbon nanotubescitations
Places of action
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article
Metal-substrate-supported tungsten-oxide nanoarrays via porous-alumina-assisted anodization: from nanocolumns to nanocapsules and nanotubes ; Nanouspořádané pole oxidů wolframu na kovovém substrátu vyrobené pomocí anodizace přes porézní aluminu: od nanosloupků po nanokaplsa a nanotrubky
Abstract
An array of highly aligned tungsten-oxide (TO) nanorods, similar to 80 nm wide, up to 900 nm long, spatially separated at their bottoms by tungsten metal on a substrate is synthesized via the self-localized anodization of aluminum followed by the porous-alumina-assisted re-anodization of tungsten in a sputter-deposited Al/W bilayer. Moreover, the pore-directed TO nanocapsules may grow, which can be electrochemically top-opened in alumina nanopores and transformed to TO nanotubes, representing unique architectures built up on tungsten substrates to date. The as-grown nanorods are composed of amorphous WO3 mixed with minor amounts of WO2 and Al2O3 in the outer layer and oxide-hydroxide compound (WO(3 center dot)nH(2)O) with aluminum tungstate (2Al(2)O(3)center dot 5WO(3)), mainly present inside the rods. Once the growing oxide fills up the pores, it comes out as an array of exotic protuberances of highly hydrated TO, with no analogues among the other valve-metal oxides. Vacuum or air annealing at 550 degrees C increases the portion of non-stoichiometric oxides 'doped' with OH-groups and gives monoclinic WO2.9 or a mixture of WO3 and WO2.9 nanocrystalline phases, respectively. The nanorods show n-type semiconductor behavior when examined by Mott-Schottky analysis, with a high carrier density of 7 x 10(19) or 3 x 10(19) cm(-3) for the air- or vacuum-annealed samples, associated with a charge depletion layer of about 8 or 10 nm, respectively. A model for the growth of the metal-substrate-separated TO nanocapsules and tubes is proposed and experimentally justified. The findings suggest that the new TO nanoarrays with well-defined nano-channels for carriers may form the basic elements for photoanodes or emerging 3-D micro- and nano-sensors. ; Řady vysoce uspořádaných nanodrátků oxidů wolframu (TO), s šířkou 80 nm a délkou 900 nm, oddělené na na jejich spodní části od substrátu pomocí wolframu byli připraveny pomocí anodizace hliníků do podoby porézní aluminy a následně pokračující anodizací wolframu přes tuto aluminu z ...