Mechanism Analysis and Application of Thermally Stimulated Currents in Hetero LB films

异质LB薄膜热刺激电流的机理分析及应用

• 批准号: 03640406
• 负责人: UMEMURA Junzo
• 金额: $ 1.41万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640406/
• 关键词: Hetero LB Films; Pyroelectricity; Infrared Sensor

Hetero Langmuir-Blodgett (LB) films consisting of alternating monolayrs of amphiphile with large permanent dipoles and long-chain fatty acid take non-centrosymmetrical structure with dipoles oriented toward one direction, and they are amenable to be used for pyro- or piezo-electric elements. In particular, the stimulated current generated by the thermal impulse can be used as an infrared sensor. The origin and the structure-relationship of this current was investigated using hetero LB films of phenylpyrazine derivatives and fatty acids. The large stimulated currents that flows when the hydrocarbon chain is disordered changed its sign, experiment by experiment. Thus, for its utilization as a sensor, we have to use the absolute value change of the current. On the other hand, the pyroelectric current which flows at relatively low temperature, is always positive at around -60ﾟC, but it changed to negative at -20-0ﾟC depending on the compound. In the case of polyion complex between pyrazine derivative and water-soluble cationic polymer, the pyroelectric coefficient did not increased because of the cancellation of increased freedom by the orientation decrease.

由具有大永久偶极子的两亲分子和长链脂肪酸交替组成的LB膜具有偶极子向一个方向取向的非中心对称结构，适于用于热、压电元件。特别地，热冲击产生的受激电流可以用作红外传感器。利用苯吡嗪衍生物和脂肪酸的杂LB膜研究了该电流的来源和结构关系。当烃链被打乱时，大的受激电流改变了它的符号，一个又一个实验。因此，为了将其用作传感器，我们必须使用电流的绝对值变化。另一方面，热释电电流在相对较低的温度下流动，在-60℃左右始终为正，但在-20-0℃时，根据化合物的不同，热释电电流变为负。在吡嗪衍生物与水溶性阳离子聚合物的多离子配合物中，由于取向的减少抵消了自由度的增加，热释电系数没有增加。

项目成果

J.Umemura: "Polymer Analysis Handbook, II, Application, Chap.9, Thin Organic Film" Kinokuniya, Tokyo. (in press).

J.Umemura：“聚合物分析手册，II，应用，第 9 章，有机薄膜”Kinokuniya，东京。

J.Umemura: "Thickness and Temperature Dependence of Molecular Structure in Stearic Acid LB Films Studied by FTIR RA Spectroscopy" J.Mol.Struct.297. 57-62 (1993)

J.Umemura：“通过 FTIR RA 光谱研究硬脂酸 LB 薄膜中分子结构的厚度和温度依赖性”J.Mol.Struct.297。

T.Hasegawa: "FT-IR Reflection-Absorption Spectra of Langmuir-Blodgett Films of Stearic Acid-d_<35> on Silver" Bull.Inst.Chem.Res.,Kyoto Univ.71. 127-132 (1993)

T.Hasekawa：“银上硬脂酸-d_<35> 的 Langmuir-Blodgett 薄膜的 FT-IR 反射吸收光谱”Bull.Inst.Chem.Res.，Kyoto Univ.71。

J.Umemura: "Effect of Thickness and Monolayr Location on Thermostability of Metal Stearate LB Films Studied by FTIRRA Spectroscopy" Spectrochim.Acta, Part A.(in press). (1994)

J.Umemura：“通过 FTIRRA 光谱研究厚度和单层位置对金属硬脂酸盐 LB 薄膜热稳定性的影响”Spectrochim.Acta，A 部分（待出版）。

T.Hasegawa: "Infrared External Reflection Study of Molecular Orientation in Thin Langmuir-Blodgett Films" J.Phys.Chem.97. 9009-12 (1993)

T.Hasekawa：“Langmuir-Blodgett 薄膜中分子取向的红外外反射研究”J.Phys.Chem.97。