A nanoscale model catalyst preparation:: Solution deposition of phosphine-stabilized gold clusters onto a planar TiO2(110) support

被引：38

作者：

Chusuei, CC ^{[1
]}

Lai, X ^{[1
]}

Davis, KA ^{[1
]}

Bowers, EK ^{[1
]}

Fackler, JP ^{[1
]}

Goodman, DW ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA

来源：

LANGMUIR | 2001年 / 17卷 / 13期

关键词：

D O I：

10.1021/la001684r

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Agglomeration of noble metal particles has been a long-standing obstacle in the preparation of planar, finely dispersed, metal cluster-oxide support model catalyst systems. A solution deposition method was devised. Six-atom gold clusters, in the form of [Au-6(PPh3)(6)][BF4](2) (Au6L6), were deposited onto a TiO2(110) single crystal after an acetone pretreatment of the substrate and examined with scanning tunneling microscopy (STM), high-resolution electron energy loss spectroscopy (HREELS), and X-ray photoelectron spectroscopy (XPS). STM revealed single-unit entities of clusters ca. 1 nm in height, corresponding to the six-atom Au center with the triphenyl phosphine ligands attached. As a check on the success of the homogeneous dispersion, electron-stimulated desorption (ESD) tvas performed, irradiating the TiO2(110) surface with a 0.12 C cm(-2) electron beam flux followed by STM, HREELS, and XPS. Evidence for ligand removal was shown by a pronounced reduction in height in the STM, a disappearance of the aromatic V(C-H) intensity at ca. 3000 cm(-1) in the HREEL spectra, and a +0.4 eV shift in the XPS Au 4f(7/2) core level.

引用

页码：4113 / 4117

页数：5

共 41 条

[31] Onset of catalytic activity of gold clusters on titania with the appearance of nonmetallic properties [J].