Surface Analysis of Ionic Liquids with and without Lithium Salt Using X-ray Photoelectron Spectroscopy
Surface Analysis of Ionic Liquids with and without Lithium Salt Using X-ray Photoelectron Spectroscopy
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DOI：
10.1021/jp301658k
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发表时间：
2012-09-06
影响因子：
3.3
通讯作者：
Umebayashi, Yasuhiro
中科院分区：
文献类型：
--
作者：
Kurisaki, Tsutomu;Tanaka, Daisaku;Umebayashi, Yasuhiro
采用X射线光电子能谱（XPS）研究了室温下纯离子液体1-乙基-3-甲基咪唑双（三氟甲磺酰基）酰亚胺[EMI+] [Tf 2 N-]及其锂盐溶液的组成和结构。记录了Li 1 s、N 1 s、C 1 s、F 1 s、O 1 s、S 2s和S 2 p的芯能级峰值。还研究了价带XPS谱（0-40 eV结合能）。使用DV-X α计算分析XPS光谱。结果表明，EMI+阳离子的平面型异构体在EMI-Tf 2N的近表面区域占主导地位。XPS测量的结果示出Li/EMI-Tf 2N中的Li Is的光谱。所提出的离子择优取向的模型表现出良好的一致性。从DV-X α计算获得的结果。
X-ray photoelectron spectroscopy (XPS) was applied to a neat ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [EMI+] [Tf2N-] and its lithium salt solution at room temperature to clarify the composition and structure of its near-surface region. Core level peaks were recorded for Li 1s, N 1s, C 1s, F 1s, O 1s, S 2s, and S 2p. Valence band XPS spectra (0-40 eV binding energy) were also studied. The XPS spectra were analyzed using DV-X alpha calculations. Results show that the planar type isomer of the EMI+ cation is dominant at the near-surface region of EMI-Tf2N. Results of XPS measurements show a spectrum of Li Is in Li/EMI-Tf2N. The proposed models for the preferred orientation of the ions exhibit good agreement with. results obtained from the DV-X alpha calculations.