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Enhancing catalytic properties of ligand-protected gold-based 25-metal atom nanoclusters by silver doping

Nasaruddin, Ricca Rahman and Hülsey, Max J. and Xie, Jianping (2022) Enhancing catalytic properties of ligand-protected gold-based 25-metal atom nanoclusters by silver doping. Molecular Catalysis, 518. pp. 1-10. ISSN 2468-8231

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Herein, engineering metal composition of metal nanoclusters (NCs) by foreign metal doping was used as an approach to synthesize gold (Au)-based 25-metal NC catalysts, without compromising the presence of their ligands and unique structure of 25 metal atoms. The Au-based 25-metal atom NCs with silver doping which can also be called as bimetallic AuAg NCs (i.e., Au25-xAgx(SR)18 NCs with x = 4–12) were successfully synthesized by co-reduction method with various feeding ratios (RAu/Ag = 24/1, 22/3 and 18/7). The Ag dopants favorably replaced Au(0) atom on the vertex of the icosahedral core and enhanced the catalytic activity of bimetallic Au25-xAgx(SR)18 NCs due to combination of several factors. As compared to monometallic Au25(SR)18 NCs, Au25-xAgx(SR)18 NCs have (1) synergistic effects of Au and Ag atoms; (2) better ligands removal's and active sites exposure due to weaker Ag-SR bond than Au-SR bond based on DFT analysis; (3) weaker Ag-H than Au-H bond based on DFT analysis; and (4) better stability as smaller metal NCs during the catalytic reaction. The study reveals a wider opportunity to tailor the catalytic properties of atomically precise Au-based 25-metal atom NC by engineering its metal composition.

Item Type: Article (Journal)
Additional Information: 8629/96763
Uncontrolled Keywords: Bimetallic nanoclusters, Gold nanoclusters, Gold-silver nanoclusters, 4-nitrophenol hydrogenation
Subjects: Q Science > QD Chemistry
T Technology > TP Chemical technology > TP155 Chemical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering
Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User: Dr Ricca Rahman Nasaruddin
Date Deposited: 15 Feb 2022 15:03
Last Modified: 15 Feb 2022 15:03
URI: http://irep.iium.edu.my/id/eprint/96763

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