Dependence on size of supported Rh nanoclusters for CO adsorption

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/104477

Title:	Dependence on size of supported Rh nanoclusters for CO adsorption
Authors:	羅夢凡;Hung, Ting-Chieh;Liao, Ting-Wei;Liao, Zhen-He;Hsu, Po-Wei;Cai, Pei-Yang;Lu, Wen-Hua;Wang, Jeng-Han;Luo, Meng-Fan
Contributors:	理學院物理學系
Keywords:	Adsorption;Aluminum oxide;Clusters;crystals;Density;Deposition;desorption;energy;Evolution;nanoparticles;Nanostructure;Surface chemistry;vapors
Date:	2016-01-01
Issue Date:	2026-04-23 11:50:57 (UTC+8)
Publisher:	Royal Society of Chemistry
Abstract:	摘要： We studied the adsorption and lateral interactions of CO molecules on Rh nanoclusters supported on an ordered thin film of Al 2 O 3 /NiAl(100) with varied surface probe techniques under ultra-high vacuum conditions and with density-functional-theory (DFT) calculations. The Rh clusters were grown with vapor deposition onto the Al 2 O 3 /NiAl(100) surface at 300 K; with increasing deposition, their mean diameter evolved from 1.0 to 3.5 nm and their height from 0.4 to 0.8 nm. The initial adsorption energy (for sparse CO coverage) and the number of adsorbed CO per surface site on the Rh clusters increased with decreasing cluster size. The former effect results from the surface structure and expanded lattice parameter of small Rh clusters, whereas the latter effect involves not only the initial adsorption energy but also altered lateral interactions among CO molecules. In contrast with CO on Rh single crystals, CO on small clusters adsorbed with their axes tilted from the surface normal, weakening the CO-CO repulsive interactions for CO coverage over a wide range. The saturated density of CO on clusters of diameter near 1.0 nm and height near 0.4 nm is 2-3 times that of large clusters (diameter ≥ 3.5 nm) or a Rh(100) surface. The CO-CO repulsive interactions on small clusters became effective at large CO densities, given that the onset of desorption of CO at saturation was 100 K lower than that of large clusters. The adsorption and lateral interactions of CO molecules on Rh nanoclusters supported on an ordered thin film of Al 2 O 3 /NiAl(100) altered with the size of the Rh clusters. 出版日期： 2016-01-01 出處： RSC advances, 2016-01, Vol.6 (5), p.383-3839 資源來源： Royal Society of Chemistry 識別號： ISSN: 2046-2069 識別號： EISSN: 2046-2069 識別號： DOI: 10.1039/c5ra20384h
Appears in Collections:	[Department of Physics] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	13	View/Open

社群 sharing

Loading...