Reversible adsorption of Au nanoparticles on SiO2/Si:: An in situ ATR-IR study

被引：35

作者：

Enders, D

Nagao, T

Pucci, A

Nakayama, T

机构：

[1] Natl Inst Mat Sci, Nanomat Lab, Tsukuba, Ibaraki 3050044, Japan

[2] Heidelberg Univ, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany

[3] JST, ICORP, Nanoscale Quantum Conductor Array Project, Kawaguchi 3320112, Japan

来源：

SURFACE SCIENCE | 2006年 / 600卷 / 06期

关键词：

infrared absorption spectroscopy; solid-liquid interfaces; clusters; adsorption kinetics; gold; silicon;

D O I：

10.1016/j.susc.2006.01.019

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：

Adsorption and desorption of Au nanoparticles (AuNP) on the (aminopropyl)triethoxysilane (APTES) treated SiO2/Si surface was monitored by in situ attenuated total reflection (ATR) infrared spectroscopy in combination with a liquid flow cell. With increasing the AuNP coverage at the surface, the absorption by water vibration was increased due to surface enhanced infrared absorption (SEIRA). Repulsive electrostatic forces between the incoming AuNP and the already adsorbed AuNP layer lead to saturation at submonolayer coverage of the surface. We clarified that the adsorption process can be described very well by a diffusion limited first-order Langmuir-kinetics model. Furthermore, we show that the AuNPs desorb from the surface when they are exposed to the solution of aminoethanethiol (AET). (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：L71 / L75

页数：5

共 38 条

[1] Functional vibrational spectroscopy of a cytochrome c monolayer:: SEIDAS probes the interaction with different surface-modified electrodes [J].