2009年11月
Surface Structural Study on Ionic Liquids Using Metastable Atom Electron Spectroscopy
JOURNAL OF PHYSICAL CHEMISTRY C
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- 巻
- 113
- 号
- 44
- 開始ページ
- 19237
- 終了ページ
- 19243
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1021/jp9056797
- 出版者・発行元
- AMER CHEMICAL SOC
The surface structures of ionic liquids 1-CnH2n+1-3-methylimidazolium tetrafluoroborate (BF4-), trifluoromethanesulfonate (OTf) and bis(trifluoromethylsulfonyl)amide (TFSA) with n = 4, 8, and 10 were investigated by ultraviolet photoemission spectroscopy (UPS) and metastable atom electron spectroscopy (MAES). The MAES spectra reveal that the anions and cations share the surface of the room-temperature ionic liquids (RTILs) with a shorter alkyl chain at n = 4 although the alkyl chain layer tends to cover the outermost surface in the case of RTILs with longer alkyl chains of n = 8 and 10. Comparison of UPS and MAES spectra demonstrates that the nonpolar groups such as the alkyl chain and the CF3 group Point toward the vacuum side, while the polar groups such as the SO3 and SO2 groups face toward the bulk side. A double-layered structure at the Surface, which consists of an alkyl chain layer and a polar layer containing anions and imidazolium rings, is proposed from these observations.
- リンク情報
- ID情報
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- DOI : 10.1021/jp9056797
- ISSN : 1932-7447
- eISSN : 1932-7455
- CiNii Articles ID : 80020708935
- Web of Science ID : WOS:000271105500038