X-ray photoelectron spectroscopy sulfur 2p study of organic thiol and disulfide binding interactions with gold surfaces
X-ray photoelectron spectroscopy sulfur 2p study of organic thiol and disulfide binding interactions with gold surfaces
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DOI：
10.1021/la960465w
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发表时间：
1996-10-16
期刊：
影响因子：
3.9
通讯作者：
Grainger, DW
中科院分区：
文献类型：
--
作者：
Castner, DG;Hinds, K;Grainger, DW
在对吸附在金表面上的硫醇和二硫化物分子的 X 射线光电子能谱 (XPS) 研究中检测到两种硫物质的存在。这些物质被分配为结合的硫醇盐（S-2p3/2 结合能为 162 eV）和未结合的硫醇/二硫化物（S-2p3/2 结合能为 163.5 至 164 eV）。这些分配与从不同硫醇（C12、C16、C18 和 C22 烷硫醇、氟化硫醇和环状聚硅氧烷硫醇）和不同吸附条件（溶剂类型、硫醇浓度、温度和冲洗）获得的 XPS 数据一致。特别是，使用硫醇吸附溶液的不良溶剂（例如，用于长链烷硫醇的乙醇）和缺乏冲洗步骤都会导致在结合的硫醇盐单层表面存在未结合的硫醇分子。这对最近断言有机单层中存在硫醇金物质的多个结合位点的研究具有影响。
The presence of two sulfur species was detected in X-ray photoelectron spectroscopy (XPS) studies of thiol and disulfide molecules adsorbed onto gold surfaces. These species are assigned to bound thiolate (S-2p3/2 binding energy of 162 eV) and unbound thiol/disulfide (S-2p3/2 binding energy from 163.5 to 164 eV). These assignments are consistent with XPS data obtained from different thiols (C12, C16, C18, and C22 alkane thiols, a fluorinated thiol, and a cyclic polysiloxane thiol) and different adsorption conditions (solvent type, thiol concentration, temperature, and rinsing). In particular, the use of a poor solvent for thiol adsorption solutions (e.g., ethanol for long chain alkanethiols) and the lack of a rinsing step both resulted in unbound thiol molecules present at the surface of the bound thiolate monolayer. This has implications for recent studies asserting the presence of multiple binding sites for gold-thiolate species in organic monolayers.