Modification of Alkanethiolate Self-Assembled Monolayers by Atomic Hydrogen: Influence of Alkyl Chain Length
Modification of Alkanethiolate Self-Assembled Monolayers by Atomic Hydrogen: Influence of Alkyl Chain Length
复制标题
原子氢对烷硫醇自组装单层的修饰：烷基链长度的影响
DOI：
10.1021/jp0646224
复制
发表时间：
2007
影响因子：
3.7
通讯作者：
D. Fairbrother
中科院分区：
文献类型：
--
作者：
J. Gorham;Billy Smith;D. Fairbrother
用X射线光电子能谱原位研究了烷基硫酸盐自组装单分子膜(SAM)与原子氢的相互作用。原子氢与金的−硫键发生反应，导致硫的脱附，并在膜内形成新的硫物种。每个SAM的硫损失均为一级动力学，其速率常数随烷基链长度的增加而减小。这支持了硫的脱附是由原子氢通过烷基链扩散到薄膜/衬底界面的观点。在两个较短的自组装膜中，硫和碳的解吸是快速和协同的。这表明十二硫酸盐和非十二硫酸盐自组装膜的改性主要是由膜/衬底界面上原子氢反应形成的完整吸附链和烷基硫碎片的脱附。对于十八烷硫酸盐和十六烷硫酸盐..。
The interaction of atomic hydrogen with four alkanethiolate self-assembled monolayers (SAMs), octadecanethiolate, hexadecanethiolate, dodecanethiolate, and nonanethiolate, has been studied in situ, using X-ray photoelectron spectroscopy. Atomic hydrogen reactions with gold−sulfur bonds result in sulfur desorption and the formation of new sulfur species within the film. The loss of sulfur from each SAM exhibits first-order kinetics with a rate constant that decreases with increasing alkyl chain length. This supports the idea that sulfur desorption is controlled by the diffusion of atomic hydrogen through the alkyl chains to the film/substrate interface. In the two shorter chain SAMs, sulfur and carbon desorption is rapid and concerted. This indicates that the modification of dodecanethiolate and nonanethiolate SAMs is dominated by desorption of intact adsorbate chains and alkyl sulfur fragments formed by atomic hydrogen reactions at the film/substrate interface. For octadecanethiolate and hexadecanethiolat...