Adsorption states of dialkyl ditelluride autooxidized monolayers on Au(111)
Adsorption states of dialkyl ditelluride autooxidized monolayers on Au(111)
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DOI：
10.1021/la047620o
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发表时间：
2005-04-12
期刊：
影响因子：
3.9
通讯作者：
Matsumoto, M
中科院分区：
文献类型：
--
作者：
Nakamura, T;Miyamae, T;Matsumoto, M
有机二碲化物合成了三种不同结构的碲酸盐（R2 Te 2，其中R =正丁基（C-4）、正辛基（C-8）和正十六烷基（C-16）），并通过X射线光电子能谱（XPS）、紫外光电子能谱（UPS）、理论分析、近边X射线吸收精细结构（NEXAFS）测量、接触角测量、和原子力显微镜（AFM）。所得到的结果表明，二烷基二碲化物形成自氧化单分子膜（AM）的表面上的环境条件下，环境光加速的氧化过程。XPS，UPS和理论分析表明，自氧化的二碲化物物种由聚合物或低聚物与Te-O-Te-O网络结构稳定的碲分子之间的氧桥断裂后的碲-金键。NEXAFS和接触角的测量表明，从表面法线的烷基链的平均倾斜角是较小的具有较长的烷基链的二烷基二碲化物的AM。AFM测量显示在二烷基二碲化物AM的表面上的高度上的几埃左右的缺陷和粗糙度特征。
Organic ditellurides (R2Te2 where R = n-butyl (C-4), n-octyl (C-8), and n-cetyl (C-16)) were synthesized, and their adsorption states after oxidation on Au(111) surfaces were studied by X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), theoretical analyses, near-edge X-ray absorption fine structure (NEXAFS) measurements, contact angle measurements, and atomic force microscopy (AFM). The obtained results show that dialkyl ditellurides form autooxidized monolayers (AMs) on the surfaces under ambient conditions and that the oxidation process is accelerated by ambient light. XPS, UPS, and theoretical analyses suggest that the autooxidized ditelluride species consist of polymers or oligomers with Te-O-Te-O network structures stabilized by oxygen bridges between tellurium molecules following the cleavage of tellurium-gold bonds. NEXAFS and contact angle measurements indicate that the average tilt angles of the alkyl chains from the surface normal are smaller for the AMs of dialkyl ditellurides having longer alkyl chains. AFM measurements show defects and roughness features around a few angstroms in height on the surfaces of the dialkyl ditelluride AMs.