Active Alloying of Au with Pt in Nanoclusters Supported on a Thin Film of Al2O3/NiAl(100)

NCU Institutional Repository > 理學院 > 物理研究所 > 期刊論文 > Item 987654321/38912

請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/38912

題名:	Active Alloying of Au with Pt in Nanoclusters Supported on a Thin Film of Al2O3/NiAl(100)
作者:	Luo,MF;Wang,CC;Hu,GR;Lin,WR;Ho,CY;Lin,YC;Hsu,YJ
貢獻者:	物理研究所
關鍵詞:	SCANNING-TUNNELING-MICROSCOPY;METHANOL OXIDATION REACTION;TOTAL-ENERGY CALCULATIONS;WAVE BASIS-SET;PHOTOELECTRON-SPECTROSCOPY;PT NANOPARTICLES;OXIDE-FILMS;GROWTH;AL2O3;CLUSTERS
日期:	2009
上傳時間:	2010-07-08 13:59:01 (UTC+8)
出版者:	中央大學
摘要:	Self-organized alloying of Au With Pt in nanoclusters on a thin film of Al2O3NiAl(100) is active at 300 K, toward a preferred bimetallic structure. The photoelectron spectra of Au nanoclusters (diameter 1.0-3.0 nm and height 0.2-1.0 nm) formed from vapor deposition on thin-film Al2O3/NiAl(100) show that the binding energy (BE) of Au 4f(7/2) decreases from 85.3 +/- 0.1 eV upon incorporating Subsequent]), deposited Pt, and saturates near 84 3 0.1 eV with increasing Pt deposition; the line width decreases simultaneously from 1.9 0 1 eV to a near 1.1 eV. The same minimal BE and line width for Au 4f are observed on both deposition of the metals in the reverse order (first Pt and then Au) and with Concurrent deposition of Au and Pi. The significant BE shift indicates increased screening, attributed oil the basis of the density-functional Calculations primarily to the increased coordination number of the alloying Au atom and secondarily to the charge transfer from Pt to Au; the narrowing of the spectral line reflects improved Structural order of the Clusters, which is corroborated by the diffraction measurements, and enhanced uniformity Of the chemical environment around each Au atom. We argue accordingly that the alloying Clusters form preferentially either all Au core-Pt shell structure or in Au-Pt Intermixed structure with no Au exposed oil (lie cluster surface; the bimetallic clusters have a fcc phase and grow with their facets either (111) or (001) parallel to the theta-Al2O3(100) surface.
關聯:	JOURNAL OF PHYSICAL CHEMISTRY C
顯示於類別:	[物理研究所] 期刊論文

文件中的檔案:

檔案	描述	大小	格式	瀏覽次數
index.html		0Kb	HTML	602	檢視/開啟

在NCUIR中所有的資料項目都受到原著作權保護.

社群 sharing

資料載入中.....