A near ambient pressure XPS study of subnanometer silver clusters on Al2O3 and TiO2 ultrathin film supports

被引：27

作者：

Mao, Bao-Hua ^{[1
,2
,3
,4
]}

Chang, Rui ^{[3
,4
]}

Shi, Lei ^{[3
]}

Zhuo, Qi-Qi ^{[4
]}

Rani, Sana ^{[4
]}

Liu, Xiao-Song ^{[3
,4
]}

Tyo, Eric C. ^{[5
,6
]}

Vajda, Stefan ^{[5
,6
,7
]}

Wang, Sui-Dong ^{[1
,2
]}

Liu, Zhi ^{[3
,4
]}

机构：

[1] Soochow Univ, Western Univ Joint Ctr Synchrotron Radiat Res, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Jiangsu, Peoples R China

[2] Soochow Univ, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Suzhou 215123, Jiangsu, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China

[4] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[5] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[6] Yale Univ, Sch Engn & Appl Sci, Dept Chem & Environm Engn, New Haven, CT 06520 USA

[7] Univ Chicago, Inst Mol Engn, Chicago, IL 60637 USA

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 48期

基金：

中国国家自然科学基金;

关键词：

IN-SITU GISAXS; PHOTOELECTRON-SPECTROSCOPY; ELECTRONIC-STRUCTURE; OXYGEN-ADSORPTION; SURFACE SCIENCE; METAL CRYSTALS; OXIDE-FILMS; GROWTH; SIZE; EPOXIDATION;

D O I：

10.1039/c4cp02325k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have investigated model systems of silver clusters with different sizes (3 and 15 atoms) deposited on alumina and titania supports using ambient pressure X-ray photoelectron spectroscopy. The electronic structures of silver clusters and support materials are studied upon exposure to various atmospheres (ultrahigh vacuum, O-2 and CO) at different temperatures. Compared to bulk silver, the binding energies of silver clusters are about 0.55 eV higher on TiO2 and 0.95 eV higher on Al2O3 due to the final state effect and the interaction with supports. No clear size effect of the silver XPS peak is observed on different silver clusters among these samples. Silver clusters on titania show better stability against sintering. Al 2p and Ti 2p core level peak positions of the alumina and titania support surfaces change upon exposure to oxygen while the Ag 3d core level position remains unchanged. We discuss the origin of these core level shifts and their implications for catalytic properties of Ag clusters.

引用

页码：26645 / 26652

页数：8

共 65 条

[1] Development of a novel gas sensor based on oxide thick films [J].