A NEXAFS AND UPS STUDY OF THIOL MONOLAYERS SELF-ASSEMBLED ON GOLD

被引：38

作者：

RIELEY, H

PRICE, NJ

WHITE, RG

BLYTH, RIR

ROBINSON, AW

机构：

[1] UNIV LIVERPOOL, DEPT PHYS, LIVERPOOL L69 3BX, MERSEYSIDE, ENGLAND

[2] UNIV LIVERPOOL, SURFACE SCI RES CTR, LIVERPOOL L69 3BX, MERSEYSIDE, ENGLAND

来源：

SURFACE SCIENCE | 1995年 / 331卷

关键词：

ALKANE THIOL; CHEMISORPTION; GOLD; NEAR EDGE EXTENDED X-RAY ABSORPTION FINE STRUCTURE (NEXAFS); PHOTOELECTRON SPECTROSCOPY;

D O I：

10.1016/0039-6028(95)00204-9

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 report an investigation of the nature of the chemical bond at the interface formed when a gold substrate is derivatised with a layer of functionalised octanethiol. Monolayers prepared on Au(111) under UHV conditions were studied using a combination of AES and UPS. A high sticking coefficient was evident for n-octanethiol, CH3(CH2)(7)SH, and the prepared layer was readily damaged by incident elect:rons. On monolayer formation, the UPS revealed both modifications to the d-band structure of the gold and the appearance of features characteristic of an adsorbed thiol species. S K-edge NEXAFS was performed on monolayer films of bromo-octane disulphide, (Br(CH2)(8)S)(2), and octane-dithiol, SH(CH2)(8)SH, prepared by adsorption from solution on Au foil. We observed chemical shifts which could be attributed to the presence of surface-bound thiolate (RS-) and sulphonate (RSO3-) species. It appears that the initially prepared S(II) undergoes facile oxidation to S(VI) as a result of photo-induced interfacial electron transfer.

引用

页码：189 / 195

页数：7

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