物理化学学报 >> 1993, Vol. 9 >> Issue (05): 597-603.doi: 10.3866/PKU.WHXB19930506

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热释电Langmuir-Blodgett膜结构的光谱研究

王融; 杨钧; 董玺娟; 王卉; 汤大新; 江雷; 李铁津; 张宝文   

  1. 吉林大学原子与分子物理研究所，化学系，长春 130023；中国科学院感光化学研究所，北京 100101
  • 收稿日期:1992-03-20 修回日期:1992-07-10 发布日期:1993-10-15
  • 通讯作者: 杨钧

Spectroscopic Studies on Structure of Pyroelectric Langmuir-Blodgett Film

Wang Rong; Yang Jun; Dong Xi-Juan; Wang Hui; Tang Da-Xin; Jiang Lei; Li Tie-Jin; Zhang Bao-Wen   

  1. Institute of Atomic Molecular Physics, Chemistry Department, Jilin University, Changchun 130023; Institute of Photographic Chemistry Academia Sinica, Beijing 100101
  • Received:1992-03-20 Revised:1992-07-10 Published:1993-10-15
  • Contact: Yang Jun

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摘要： 利用Langmuir-Blodgett(LB)技术对偶氮苯衍生物进行极性分子组装. 紫外-可见吸收光谱显示该膜具有类H聚集效应, 利用红外线性二向色性光谱获得了分子的主要极性功能团的跃迁矩与膜表面法线的夹角, 并结合其它光谱信息, 给出了膜结构模型, 就此对其优越的热释电性能做出解释.

关键词: LB膜, 红外吸收光谱, 紫外-可见吸收光谱, 聚集

Abstract: Azobenzene derivative (AD) was organized to form Z type polar films by Langmuir-Blodgett technique. The UV-VIS spectra show that the spectra of chloro-form solution exhibited a broad band with λ_(max) at 480 nm, corresponding to the mon-omer, while the spectra observed on AD film exhibited a sharp peak at 380 nm, corresponding to the absorption of the H-like aggregates. The 100 nm blue-shift of the absorption band from the monomer to the aggregates displays the existence of a high aggregate in the AD film. the linear dichroic FTIR spectra of AD film give informations on the molecular orientation of several main transition moments. The results show that the tilt angle of the axis of the hydrocarbon chain is 50° from the surface normal, and the tile angle of the azobenzene chromophore is 35°. The X-ray diffraction spectra display there are double long spacings of 3.5 nm and 3.1 nm respectively in the AD film. The further work of this system has been studied by temperature-changed UV-VIS spectra and infrared spectra.
According to the results mentioned above, the structure may play an important role in the high pyroelectric property owing to a contribution of the intermolecular additional dipole moments added to the spontaneous dipole moments.

Key words: LB film, Infrared spectra, UV-VIS spectra, Aggregation