Thermal treatment of n-alkanethiolate monolayers on gold, as observed by infrared spectroscopy
Thermal treatment of n-alkanethiolate monolayers on gold, as observed by infrared spectroscopy
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DOI：
10.1021/la9711589
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发表时间：
1998-04-28
期刊：
影响因子：
3.9
通讯作者：
Lennox, RB
中科院分区：
文献类型：
--
作者：
Bensebaa, F;Ellis, TH;Lennox, RB
在本工作中，我们使用反射-吸收红外光谱（RAIRS）来研究吸附在金衬底上的正烷基硫醇的温度行为。仔细检查的光谱（频率，积分强度，和链接宽度）揭示了至少两种不同类型的热诱导的温度升高的障碍。这些意见进行了讨论，在最近的其他研究中使用的补充技术。出现的总体情况是，初始阶段的特征在于逐渐untilling的烷基链和外观的gauche构象缺陷附近的表面，这两种效果在很大程度上是可逆的。随后的不可逆无序的单分子层的特征在于大量的缺陷位于表面以下。红外光谱特别适合检测这些变化。
In the present work, we have used reflection-absorption infrared spectroscopy (RAIRS) to investigate the temperature behavior of n-alkanethiols adsorbed on gold substrates. A careful examination of the spectra (frequencies, integrated intensities, and link widths) reveals at least two different types of thermally induced disorder as the temperature is increased. These observations are discussed in light of other recent studies using complementary techniques. The overall picture that emerges is that an initial stage is characterized by a gradual untilting of the alkyl chain and the appearance of gauche conformational defects near the surface, and both of these effects are largely reversible. The subsequent nonreversible disordering of the monolayer is characterized by a large number of defects located below the surface. Infrared spectroscopy is particularly well suited for detecting these changes.