文献类型：会议论文

英文题名：Structure characterization of new cyanine dye Langmuir-Blodgett multilayers by polarized UV-vis spectroscopy

作者：Ma, Shihong[1];Gao, Feng[1];Zeng, Hao[1];Wang, Chuang[2];Wang, Wencheng[2];Tian, He[3]

机构：[1]Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China;[2]Fudan Univ, State Key Lab Adv Photon Mat & Devices, Shanghai 200433, Peoples R China;[3]East China Univ Sci & Technol, Chem & Pharmaceut Inst, Shanghai 200237, Peoples R China

会议论文集：Conference on Infrared and Photoelectronic Imagers and Detector Devices

会议日期：AUG 13-14, 2006

会议地点：San Diego, CA

语种：英文

外文关键词：Langmuir-Blodgett film; UV-visible spectra; polarized UV-visible spectra; x-ray diffraction; cyanine dye

摘要：We investigated on cyanine dye (HQ) in Langmuir and Langmuir-Blodgett (LB) films by surface pressure-area (pi-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 0.8nm(2)/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+.