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Issue 27, 2015
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Molecular orientation of organic thin films on dielectric solid substrates: a phase-sensitive vibrational SFG study

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Abstract

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.

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

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Publication details

The article was received on 11 May 2015, accepted on 08 Jun 2015 and first published on 09 Jun 2015


Article type: Paper
DOI: 10.1039/C5CP02702K
Citation: Phys. Chem. Chem. Phys., 2015,17, 18072-18078
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    Molecular orientation of organic thin films on dielectric solid substrates: a phase-sensitive vibrational SFG study

    A. Ge, Q. Peng, L. Qiao, N. R. Yepuri, T. A. Darwish, M. Matsusaki, M. Akashi and S. Ye, Phys. Chem. Chem. Phys., 2015, 17, 18072
    DOI: 10.1039/C5CP02702K

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