SELF-ASSEMBLED MONOLAYERS OF N-ALKANETHIOLATES ON COPPER ARE BARRIER FILMS THAT PROTECT THE METAL AGAINST OXIDATION BY AIR
SELF-ASSEMBLED MONOLAYERS OF N-ALKANETHIOLATES ON COPPER ARE BARRIER FILMS THAT PROTECT THE METAL AGAINST OXIDATION BY AIR
复制标题
DOI：
10.1021/ja00049a038
复制
发表时间：
1992-11-04
影响因子：
15
通讯作者：
WHITESIDES, GM
中科院分区：
文献类型：
--
作者：
LAIBINIS, PE;WHITESIDES, GM
由正硫醇在铜表面吸附形成的自组装单分子膜(SAM)通过与大气中的氧气反应减缓了铜表面的氧化。单层厚度的埃级别变化导致铜和吸附的硫代硫酸盐的氧化速率(通过X射线光电子能谱，XPS)容易观察到的差异。通过增加四个CH2单元的吸附长度，铜和硫代硫酸盐的氧化速率可以降低约50%，从而减少SAM的氧化速率。当组合暴露在烷基硫醇溶液中时，存在于氧化界面上的物种-烷基磺酸盐和铜(II)-被取代，所产生的自组装膜类似于氧化前存在的自组装膜，尽管支撑表面更加粗糙。
Self-assembled monolayers (SAMs) derived from adsorption of n-alkanethiols onto the surfaces of copper slow the oxidation of the copper surface by reaction with atmospheric dioxygen. Angstrom-level changes in the thickness of the monolayer result in readily observable differences (by X-ray photoelectron spectroscopy, XPS) in the rates of oxidation of the copper and adsorbed thiolates. The rates of oxidation of the copper and the thiolates can be decreased by approximately 50% by increasing the length of the adsorbate, and thus of the SAM, by four CH2 units. The species present on the oxidized interface-both alkanesulfonate and Cu(II)-are replaced when the assemblage is exposed to solutions of alkanethiols, and the resulting SAMs resembled those that were present before the oxidation, although the supporting surface is rougher.