利用表面等离子体共振光谱（SPRS）对链烷硫醇的热脱附进行原位监测。

In-situ monitoring of the thermal desorption of alkanethiols with surface plasmon resonance spectroscopy (SPRS).

作者信息

Li J, Ang X F, Lee K H, Romanato F, Wong C C

机构信息

School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore.

出版信息

J Nanosci Nanotechnol. 2010 Jul;10(7):4624-8. doi: 10.1166/jnn.2010.1685.

DOI:10.1166/jnn.2010.1685

PMID:21128468

Abstract

Thermal desorption investigations on self-assembled monolayers (SAMs) had previously been carried out using techniques such as thermal desorption spectroscopy (TDS), scanning tunneling microscopy (STM) and X-ray photo-electron spectroscopy (XPS). In this paper, the thermal dissociation of alkanethiols (CnH(2n + 1)SH) at various chain lengths (n= 6, 12, 18) on sputtered gold layers was monitored in-situ using the Kretschmann surface plasmon resonance configuration on a spectroscopic ellipsometer. We found that the longest alkanethiol (C18) exhibits the greatest thermal stability, manifested by the least amount of angular shift, during heating, in the resonant spectral features. Predictions of desorption temperatures from SPRS for the longer chain thiols are in good agreement with XPS measurements.

摘要

先前曾使用热脱附光谱法（TDS）、扫描隧道显微镜（STM）和X射线光电子能谱（XPS）等技术对自组装单分子层（SAMs）进行热脱附研究。在本文中，使用光谱椭偏仪上的Kretschmann表面等离子体共振配置，原位监测了不同链长（n = 6、12、18）的链烷硫醇（CnH(2n + 1)SH）在溅射金层上的热解离。我们发现，最长的链烷硫醇（C18）表现出最大的热稳定性，在加热过程中，共振光谱特征的角位移量最小。表面等离子体共振光谱法（SPRS）对较长链硫醇脱附温度的预测与XPS测量结果吻合良好。