Quantitative analysis of molecular orientation of structurally heterogeneous Langmuir-Blodgett films by infrared reflection-absorption spectra

Details Quantitative analysis of molecular orientation of structurally heterogeneous Langmuir-Blodgett films by infrared reflection-absorption spectra Quantitative analysis of molecular orientation of structurally heterogeneous Langmuir-Blodgett films by infrared reflection-absorption spectra

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..430..638h&link_type=abstract

The eleventh international conference on fourier transform spectroscopy. AIP Conference Proceedings, Volume 430, pp. 638-640 (1

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Infrared reflection-absorption (RA) spectra were measured for Langmuir-Blodgett (LB) films of octadecyl-dimethylamine oxide (C18DAO) and dioctadecyl-dimethylammonium chloride (2C18DAC) on gold-evaporated slide glasses. The RA spectra showed unique relations between the reflection-absorbance and the number of layers of the LB films. Since the RA spectrum of the monolayer LB film showed different properties from the upper layers especially for the C18DAO LB film, this layer was separated from other layers in the molecular orientation analysis. We then proposed a new schematic model comprising a four-phase architecture (IR//air/LB2/LB1/gold) to explain the RA spectra (LB1 refers to the first monolayer only). The results by the new model indicated that the first monolayer directly on the substrate had different film structure from that of the upper layers. These relations could not be figured out by a simple three-phase model (IR//air/LB/gold) that ignored the heterogeneous architecture in the film phase. The present structurally heterogeneous property was also recognized in the temperature-dependent RA spectra of the LB films.

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