Molecular orientation of organic thin films on dielectric solid substrates: A phase-sensitive vibrational SFG study

Aimin Ge, Qiling Peng, Lin Qiao, Nageshwar R. Yepuri, Tamim A. Darwish, Michiya Matsusaki, Mitsuru Akashi, Shen Ye

研究成果: Article査読

26 被引用数 (Scopus)

抄録

Broadband phase-sensitive vibrational sum frequency generation (SFG) spectroscopy was utilized to study the molecular orientation of molecules adsorbed on dielectric solid substrates. A gold thin film was employed to generate a SFG signal as a local oscillator (LO). To simplify the phase measurement, a self-assembled monolayer (SAM) of octadecyltrichlorosilane (OTS) was used as a standard sample for phase correction of the phase-sensitive SFG measurements on the solid/air interface. It was demonstrated that the absolute orientation of molecules in the LB films on a fused quartz surface can be clearly distinguished by phase-sensitive SFG measurement. In addition, the observation on the SAM of d35-OTS reveals that the two C-H stretching modes for α-CH2 group are in opposite phase. Furthermore, by using the present phase-sensitive SFG setup, the orientation flipping of water molecules on positively and negatively charged solid/liquid interface can be distinguished.

本文言語English
ページ(範囲)18072-18078
ページ数7
ジャーナルPhysical Chemistry Chemical Physics
17
27
DOI
出版ステータスPublished - 2015 7 21
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)
  • 物理化学および理論化学

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