Hiển thị ở chế độ nhân viên: Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity

Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity

This work presents a gas-phase approach for the synthesis of Cu2O/TiO2 powder-based photocatalysts using atomic layer deposition (ALD). The process is carried out in a fluidized bed reactor working at atmospheric pressure using (trimethylvinylsilyl)-hexafluoroacetulacetonate copper(I) as the Cu-prec...

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Tác giả chính:	Dominik Benz1, Y-Nhi T Nguyen, Thanh-Lieu T Le, Thanh-Hiep T Le, Viet-Thong Le, J Ruud van Ommen, Hao Van Bui
Định dạng:	Bài trích
Ngôn ngữ:	eng
Nhà xuất bản:	Nanotechnology 2021
Truy cập trực tuyến:	https://iopscience.iop.org/article/10.1088/1361-6528/ac10e2 https://dlib.phenikaa-uni.edu.vn/handle/PNK/2842
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spelling	oai:localhost:PNK-28422022-08-17T05:54:47Z Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity Dominik Benz1 Y-Nhi T Nguyen Thanh-Lieu T Le Thanh-Hiep T Le Viet-Thong Le J Ruud van Ommen Hao Van Bui This work presents a gas-phase approach for the synthesis of Cu2O/TiO2 powder-based photocatalysts using atomic layer deposition (ALD). The process is carried out in a fluidized bed reactor working at atmospheric pressure using (trimethylvinylsilyl)-hexafluoroacetulacetonate copper(I) as the Cu-precursor and H2O vapor as the oxidizer. The saturating regime of the chemical reactions and the linear growth of ALD are achieved. In combination with the unsaturated regime, the ALD approach enables the deposition of ultrasmall Cu2O clusters with average diameters in the range of 1.3–2.0 nm, narrow particle size distributions and tunable Cu2O loadings on P25 TiO2 nanoparticles. The photocatalytic performance of Cu2O/TiO2 photocatalysts is investigated by the degradation of organic dyes, including Rhodamine B (RhB), methyl orange, and methylene blue; the results demonstrate that the surface modification of TiO2 nanoparticles by Cu2O nanoclusters significantly enhances the photocatalytic activity of TiO2. This is attributed to the efficient charge transfer between Cu2O and TiO2 that reduces the charge recombination. The photocatalytic reaction mechanism is further investigated for the degradation of RhB, revealing the dominating role of holes, which contribute to both direct hole oxidation and indirect oxidation (i.e. via the formation of hydroxyl radicals). Our approach provides a fast, scalable and efficient process to deposit ultrasmall Cu2O clusters in a controllable fashion for surface engineering and modification. 2021-09-14T07:14:52Z 2021-09-14T07:14:52Z 2021 Bài trích https://iopscience.iop.org/article/10.1088/1361-6528/ac10e2 https://dlib.phenikaa-uni.edu.vn/handle/PNK/2842 eng Nanotechnology
institution	Digital Phenikaa
collection	Digital Phenikaa
language	eng
description	This work presents a gas-phase approach for the synthesis of Cu2O/TiO2 powder-based photocatalysts using atomic layer deposition (ALD). The process is carried out in a fluidized bed reactor working at atmospheric pressure using (trimethylvinylsilyl)-hexafluoroacetulacetonate copper(I) as the Cu-precursor and H2O vapor as the oxidizer. The saturating regime of the chemical reactions and the linear growth of ALD are achieved. In combination with the unsaturated regime, the ALD approach enables the deposition of ultrasmall Cu2O clusters with average diameters in the range of 1.3–2.0 nm, narrow particle size distributions and tunable Cu2O loadings on P25 TiO2 nanoparticles. The photocatalytic performance of Cu2O/TiO2 photocatalysts is investigated by the degradation of organic dyes, including Rhodamine B (RhB), methyl orange, and methylene blue; the results demonstrate that the surface modification of TiO2 nanoparticles by Cu2O nanoclusters significantly enhances the photocatalytic activity of TiO2. This is attributed to the efficient charge transfer between Cu2O and TiO2 that reduces the charge recombination. The photocatalytic reaction mechanism is further investigated for the degradation of RhB, revealing the dominating role of holes, which contribute to both direct hole oxidation and indirect oxidation (i.e. via the formation of hydroxyl radicals). Our approach provides a fast, scalable and efficient process to deposit ultrasmall Cu2O clusters in a controllable fashion for surface engineering and modification.
format	Bài trích
author	Dominik Benz1 Y-Nhi T Nguyen Thanh-Lieu T Le Thanh-Hiep T Le Viet-Thong Le J Ruud van Ommen Hao Van Bui
spellingShingle	Dominik Benz1 Y-Nhi T Nguyen Thanh-Lieu T Le Thanh-Hiep T Le Viet-Thong Le J Ruud van Ommen Hao Van Bui Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity
author_facet	Dominik Benz1 Y-Nhi T Nguyen Thanh-Lieu T Le Thanh-Hiep T Le Viet-Thong Le J Ruud van Ommen Hao Van Bui
author_sort	Dominik Benz1
title	Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity
title_short	Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity
title_full	Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity
title_fullStr	Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity
title_full_unstemmed	Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity
title_sort	controlled growth of ultrasmall cu2o clusters on tio2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity
publisher	Nanotechnology
publishDate	2021
url	https://iopscience.iop.org/article/10.1088/1361-6528/ac10e2 https://dlib.phenikaa-uni.edu.vn/handle/PNK/2842
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score	8.8926115

Controlled growth of ultrasmall Cu2O clusters on TiO2 nanoparticles by atmospheric-pressure atomic layer deposition for enhanced photocatalytic activity

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