[The investigation of photoacoustic spectroscopy for polydiacetylene Langmuir-Blodgett films. (I) Structure characterization and photoacoustic absorption coefficient spectra].
The polydiacetylene (PAD) Langmuir-Blodgett (LB) films, which have potential applications in industry, were studied by using X-ray low angle diffraction and photoacoustic chopping frequency effects and photoacoustic absorption coefficients obtained. The X-ray low angle diffraction of PDA LB films prepared by different sequence of polymerization/transferring shows that the two kinds of PDA LB films have different array structures. The chopping frequency effects of PDA LB films of different thickness are consistent with Roscenwaig-Gersho theory and show that the thermal property of PDA LB films gradually becomes obvious with the increase of thickness. A new method of acquiring photoacoustic absorption coefficient from photoacoustic spectroscopy was also developed. The achievement of this paper shows that the PAS technique is a valid means for studying LB films.
Jiang
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Department of Optoelectronic Engineering, Beijing Institute of Technology, 100081 Beijing.