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利用吸收谱和二次谐波产生 (SHG)技术研究了温度对半花菁Langmuir Blodgett(LB)多层膜的膜结构和非线性光学特性的影响。LB膜的二次谐波强度起初随温度的增加而增加 ,最大值约在 45℃左右 ,然后随温度的增加而减小。在半花菁与花生酸或花生酸铬交替的LB多层膜中 ,由于花生酸的融化 ,导致膜结构的变化 ,使得二次谐波强度随温度的变化有一个突变点。线性吸收谱表明半花菁分子在LB多层膜中形成了H 聚集体 ,并且通过加热可以使聚集体分解
The influence of temperature on the film structure and nonlinear optical properties of hemimorphic Langmuir Blodgett (LB) multilayers was studied by using absorption and second harmonic generation (SHG) techniques. The second harmonic intensity of LB film initially increases with increasing temperature, the maximum value is about 45 ℃, and then decreases with increasing temperature. In the LB multilayers where hemocyanine and arachidic acid or arachidic acid alternate, due to the melting of arachidic acid, the membrane structure changes and the second harmonic intensity changes with temperature. The linear absorption spectrum indicates that hemicyanine molecules form H aggregates in the LB multilayer film, and the aggregates can be decomposed by heating