Atomic scale characterization of the Pt/TiO2 interface

被引：24
作者：
Iddir, H [1 ]
Disko, MM
Ogut, S
Browning, ND
机构：
[1] Univ Illinois, Dept Phys, Chicago, IL 60607 USA
[2] ExxonMobil Res & Engn Co, Corp Strateg Res, Annandale, NJ 08801 USA
[3] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA
[4] Lawrence Berkeley Natl Lab, NCEM, Berkeley, CA 94720 USA
来源：
MICRON | 2005年 / 36卷 / 03期
关键词：
STEM; Z-contrast imaging; EELS; SMSI; heterogeneous catalysts; Pt/TiO2;
D O I：
10.1016/j.micron.2004.12.002
中图分类号：
TH742 [显微镜];
学科分类号：
摘要：
We present results from an investigation of the Pt/TiO2 catalyst system using a combination of Z-contrast imaging and electron energy loss spectroscopy (EELS) in the scanning transmission electron microscope. Evidence of a strong interaction between the Pt particles and the support is found to be dependent on the Pt cluster size, being manifested either as an encapsulation of the Pt particles by the support or a distortion of the structure of the Pt particles. In the case of clusters that are only a few atoms in size, we show direct evidence of an epitaxial nucleation relationship between Pt and Titania. The results also show unexpectedly that Pt particles exhibit a preferential nucleation on rutile rather than anatase. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：233 / 241
页数：9
相关论文
共 48 条
[31]   DIRECT OBSERVATION OF THE SURFACES OF SMALL METAL CRYSTALLITES - RHODIUM SUPPORTED ON TIO2 [J].
LOGAN, AD ;
BRAUNSCHWEIG, EJ ;
DATYE, AK ;
SMITH, DJ .
LANGMUIR, 1988, 4 (04) :827-830
[32]   Theoretical study of the Au/TiO2(110) interface [J].
Lopez, N ;
Norskov, JK .
SURFACE SCIENCE, 2002, 515 (01) :175-186
[33]   THERMAL-STABILITY OF PT FILMS ON TIO2(110) - EVIDENCE FOR ENCAPSULATION [J].
PESTY, F ;
STEINRUCK, HP ;
MADEY, TE .
SURFACE SCIENCE, 1995, 339 (1-2) :83-95
[34]   Energetics of nanocrystalline TiO2 [J].
Ranade, MR ;
Navrotsky, A ;
Zhang, HZ ;
Banfield, JF ;
Elder, SH ;
Zaban, A ;
Borse, PH ;
Kulkarni, SK ;
Doran, GS ;
Whitfield, HJ .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2002, 99 :6476-6481
[35]   THE STRUCTURE OF RUTHENIUM SUPPORTED ON TITANIA - A CATALYST FOR LOW-TEMPERATURE METHANATION OF CARBON-DIOXIDE [J].
RUTERANA, P ;
BUFFAT, PA ;
THAMPI, KR ;
GRAETZEL, M .
ULTRAMICROSCOPY, 1990, 34 (1-2) :66-72
[36]  
RUTERANA P, 1988, INST PHYS CONF SER, V93, P287
[37]  
Ruterana P., 1988, MRS ONLINE P LIBR, V139, P327, DOI [10.1557/PROC-139-327, DOI 10.1557/PROC-139-327]
[38]   Electronic structure of Pt overlayers on (1x3) reconstructed TiO2(100) surfaces [J].
Schierbaum, KD ;
Fischer, S ;
Wincott, P ;
Hardman, P ;
Dhanak, V ;
Jones, G ;
Thornton, G .
SURFACE SCIENCE, 1997, 391 (1-3) :196-203
[39]  
Stakheev AY, 2001, MENDELEEV COMMUN, P186
[40]  
TAKAKUSAGI S, 2003, PHYS REV LETT, V91, P1
12345