Structure characterization of new cyanine dye Langmuir-Blodgett multilayers by polarized UV-vis spectroscopy

Shihong Ma; Feng Gao; Hao Zeng; Chuang Wang; Wencheng Wang; He Tian

doi:10.1117/12.676195

7 September 2006 Structure characterization of new cyanine dye Langmuir-Blodgett multilayers by polarized UV-vis spectroscopy

Shihong Ma, Feng Gao, Hao Zeng, Chuang Wang, Wencheng Wang, He Tian

Author Affiliations +

Proceedings Volume 6294, Infrared and Photoelectronic Imagers and Detector Devices II; 62940G (2006) https://doi.org/10.1117/12.676195
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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⁺.

Citation Download Citation

Shihong Ma, Feng Gao, Hao Zeng, Chuang Wang, Wencheng Wang, and He Tian "Structure characterization of new cyanine dye Langmuir-Blodgett multilayers by polarized UV-vis spectroscopy", Proc. SPIE 6294, Infrared and Photoelectronic Imagers and Detector Devices II, 62940G (7 September 2006); https://doi.org/10.1117/12.676195

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