温度对偶氮苯LB膜吸收光谱和二次谐波产生的影响
Influence of temperature on absorption spectra and second-armonic generation in azobenzen Langmuir-Blodgett films
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摘要: 采用紫外可见吸收谱和二次谐波产生技术研究了温度对4硝基4′氨基偶氮苯（NAA）分子Langmuir-Blodgett（LB）单层和多层膜的光谱和二阶非线性光学特性的影响。单层LB膜的二次谐波强度在室温至80 ℃的温度范围内随温度的增加基本成单调下降关系，温度高于80 ℃后基本没有二次谐波信号。多层LB膜的二次谐波强度随温度的变化分为几个不同的温度阶段。吸收谱表明单层LB膜分子的有序排列受热后不易恢复，超过80 ℃后则不能恢复;多层LB膜的则较容易恢复，温度达到80 ℃后仍能恢复，超过100 ℃后则不能恢复。由于NAA的多层LB膜存在层间分子的相互作用，其结构的稳定性比单层膜要强。
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关键词:
- Langmuir-Blodgett膜 /
- 二次谐波产生 /
- 吸收光谱 /
- 偶氮苯 /
- 温度
Abstract: The influence of temperature on the spectra and nonlinear optics properties of the 4(nitro) 4′aminoazobenzene compound Langmuir-Blodgett(LB)films were investigated using UV visible absorption spectra and second harmonic generation (SHG) technique. The SHG intensity of the monolayer LB films declined monotonically with the increase of temperature from room temperature to 80 ℃ and became faint when the temperature exceeded 80 ℃. The SHG intensity of the multilayer LB films decreased rapidly at first, then slowly, then kept steady, and then decreased when the temperature increased. The absorption spectra showed that the orderly arrangement of the molecule in the monolayer LB films was not easy to recovery after heating, and it could not recover when the temperature was above 80 ℃. But it-
Key words:
- langmuir-blodgett films /
- second-harmonic generation /
- absorption spectra /
- azobenzene /
- temperature
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