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合成了一种新的双亲性有机分子2-硝基-5-(N-甲基-N-十八烷基)胺基苯甲酸(简称NMOB),成功地制备了达100双层与花生酸交替的多层LB膜(厚度约0.6μm)。x小角衍射图表明,特别是与层数成平方关系的光学二次谐波信号的获得证明,这一交替多层LB膜具有完整的层状结构。还用电光调制ATR谱测量了NMOB单分子膜的电光特性以及电光响应的波长关系。以上测量表明NMOB是一种具有较强光学非线性(与铌酸锂同一量级)并具有优良成膜性能的LB材料。这是有关NMOB光学非线性性质研究的首篇报导。
A new amphiphilic organic molecule named 2-nitro-5- (N-methyl-N-octadecyl) aminobenzoic acid (NMOB) was synthesized and 100 bi- Alternating multilayered LB films (thickness about 0.6 μm). The x-angle diffraction pattern shows that the gain of the optical second harmonic signal, especially the square of the number of layers, proves that this alternating multilayer LB film has a complete layered structure. The electro-optic modulation ATR spectrum was also used to measure the electro-optic properties of NMOB monolayers and the wavelength dependence of electro-optic response. The above measurements show that NMOB is a kind of LB material with strong optical nonlinearities (same grade as lithium niobate) and excellent film-forming properties. This is the first report on the study of the nonlinear optical properties of NMOBs.