Anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films

Abstract Herein, we combine titania layers with gold species in a laser-supported process and report a substantial change of properties of the resulting heterostructures depending on the major processing parameters. Electrodes were fabricated via an anodisation process complemented with calcination...

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Autores principales:	Katarzyna Grochowska, Nikolay Nedyalkov, Jakub Karczewski, Łukasz Haryński, Gerard Śliwiński, Katarzyna Siuzdak
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/78342be1330e43e1863fd54a6c6eda0c
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spelling	oai:doaj.org-article:78342be1330e43e1863fd54a6c6eda0c2021-12-02T11:41:08ZAnodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films10.1038/s41598-020-77710-x2045-2322https://doaj.org/article/78342be1330e43e1863fd54a6c6eda0c2020-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-77710-xhttps://doaj.org/toc/2045-2322Abstract Herein, we combine titania layers with gold species in a laser-supported process and report a substantial change of properties of the resulting heterostructures depending on the major processing parameters. Electrodes were fabricated via an anodisation process complemented with calcination to ensure a crystalline phase, and followed by magnetron sputtering of metallic films. The obtained TiO2 nanotubes with deposited thin (5, 10 nm) Au films were treated with a UV laser (355 nm) to form Au nanoparticles on top of the nanotubes. It was proven that selected laser working parameters ensure not only the formation of Au nanoparticles, but also simultaneously provide preservation of the initial tubular architecture, while above-threshold laser fluences result in partial destruction (melting) of the top layer of the nanotubes. For almost all of the samples, the crystalline phase of the nanotubes observed in Raman spectra was maintained independently of the laser processing parameters. Enhanced photoresponse up to ca 6 mA/cm2 was demonstrated by photoelectrochemical measurements on samples obtained by laser annealing of the 10 nm Au coating on a titania support. Moreover, a Mott–Schottky analysis indicated the dramatically increased (two orders of magnitude) concentration of donor density in the case of a laser-treated Au–TiO2 heterojunction compared to reference electrodes.Katarzyna GrochowskaNikolay NedyalkovJakub KarczewskiŁukasz HaryńskiGerard ŚliwińskiKatarzyna SiuzdakNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-16 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Katarzyna Grochowska Nikolay Nedyalkov Jakub Karczewski Łukasz Haryński Gerard Śliwiński Katarzyna Siuzdak Anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films
description	Abstract Herein, we combine titania layers with gold species in a laser-supported process and report a substantial change of properties of the resulting heterostructures depending on the major processing parameters. Electrodes were fabricated via an anodisation process complemented with calcination to ensure a crystalline phase, and followed by magnetron sputtering of metallic films. The obtained TiO2 nanotubes with deposited thin (5, 10 nm) Au films were treated with a UV laser (355 nm) to form Au nanoparticles on top of the nanotubes. It was proven that selected laser working parameters ensure not only the formation of Au nanoparticles, but also simultaneously provide preservation of the initial tubular architecture, while above-threshold laser fluences result in partial destruction (melting) of the top layer of the nanotubes. For almost all of the samples, the crystalline phase of the nanotubes observed in Raman spectra was maintained independently of the laser processing parameters. Enhanced photoresponse up to ca 6 mA/cm2 was demonstrated by photoelectrochemical measurements on samples obtained by laser annealing of the 10 nm Au coating on a titania support. Moreover, a Mott–Schottky analysis indicated the dramatically increased (two orders of magnitude) concentration of donor density in the case of a laser-treated Au–TiO2 heterojunction compared to reference electrodes.
format	article
author	Katarzyna Grochowska Nikolay Nedyalkov Jakub Karczewski Łukasz Haryński Gerard Śliwiński Katarzyna Siuzdak
author_facet	Katarzyna Grochowska Nikolay Nedyalkov Jakub Karczewski Łukasz Haryński Gerard Śliwiński Katarzyna Siuzdak
author_sort	Katarzyna Grochowska
title	Anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films
title_short	Anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films
title_full	Anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films
title_fullStr	Anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films
title_full_unstemmed	Anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films
title_sort	anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/78342be1330e43e1863fd54a6c6eda0c
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Anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films

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