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Proceedings Paper

Structure characterization of new cyanine dye Langmuir-Blodgett multilayers by polarized UV-vis spectroscopy
Author(s): Shihong Ma; Feng Gao; Hao Zeng; Chuang Wang; Wencheng Wang; He Tian
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Paper Abstract

We investigated on cyanine dye (HQ) in Langmuir and Langmuir-Blodgett (LB) films by surface pressure-area (π-A) isotherms, UV-visible and polarized UV-visible spectra as well as small angle x-ray diffraction (SAXD) measurement. It is found from the isotherms that there is a critical point on Langmuir films near the area 0.8nm2/molecule for HQ LB films with and without Cd2+ ions respectively and suggested that the facts should result from the phase transition due to the change of molecular tilt angle on surface of sub-phase. UV-visible spectra indicated a uniform film transfer. The orientation angle of HQ molecular chromophore in LB films was measured by polarized UV-visible absorption spectra, and the result showed that the angle with respect to the substrate surface was 65 and 59 degree without and with Cd2+ ions respectively, which are agreement with those obtained from the surface pressure-area isotherm. It is suggested that the arrangements of the HQ molecule in LB films incorporating Cd2+ ions was more compact than those without Cd2+.

Paper Details

Date Published: 7 September 2006
PDF: 7 pages
Proc. SPIE 6294, Infrared and Photoelectronic Imagers and Detector Devices II, 62940G (7 September 2006); doi: 10.1117/12.676195
Show Author Affiliations
Shihong Ma, Fudan Univ. (China)
Feng Gao, Fudan Univ. (China)
Hao Zeng, Fudan Univ. (China)
Chuang Wang, Fudan Univ. (China)
Wencheng Wang, Fudan Univ. (China)
He Tian, East China Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 6294:
Infrared and Photoelectronic Imagers and Detector Devices II
Randolph E. Longshore; Ashok Sood, Editor(s)

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