Dielectric properties of a superlattice containing a linear copolysiloxane substituted with aromatic acid side chains Langmuir-Blodgett films

ICSE 2000. 2000 IEEE International Conference on Semiconductor Electronics. Proceedings (Cat. No.00EX425) Pub Date : 1900-01-01 DOI:10.1109/SMELEC.2000.932301

W. Majid, T. Richardson

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引用次数: 1

Abstract

The dielectric behaviour of the Langmuir-Blodgett (LB) superlattice containing linear copolysiloxane is investigated by examining the dielectric loss and capacitance of the superlattice at room temperature (21/spl deg/C) in the frequency range of 10/sup 2/ to 10/sup 3/ Hz. The maximum loss value occurs at a frequency of /spl sim/5000 Hz, which corresponds to a relaxation time of 3.18/spl times/10/sup -5/ s. The static permittivity /spl epsiv//sub s/ and the induced permittivity /spl epsiv//sub /spl infin// of the superlattice estimated by extrapolating the Cole-Cole plot of the dispersion curve of the superlattice to frequencies /spl omega/=0 and /spl omega/=/spl infin/ are 3.80 and 3.57 respectively. The Cole-Cole plot obtained experimentally is found to be broad and fall inside the semicircle of the Cole-Cole plot derived for the Debye relaxation theory, but relatively fits with the semi-empirical Cole-Cole relaxation model with /spl alpha//spl sim/0.68.

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含有芳酸侧链取代的线性共聚硅氧烷的超晶格Langmuir-Blodgett薄膜的介电性质

研究了含线性共聚硅氧烷的Langmuir-Blodgett (LB)超晶格在10/sup 2 ~ 10/sup 3/ Hz频率范围内的介电损耗和电容，研究了LB超晶格在室温(21/spl℃)下的介电行为。最大损耗值出现在/spl sim/5000 Hz频率处，对应的弛豫时间为3.18/spl times/10/sup -5/ s。根据超晶格色散曲线的Cole-Cole图外推/spl omega/=0和/spl omega/=/spl infin/频率，估算出超晶格的静态介电常数/spl epsiv//sub /spl infin/和感应介电常数/spl epsiv//sub /spl infin/分别为3.80和3.57。实验得到的Cole-Cole图较宽，落在Debye松弛理论导出的Cole-Cole图的半圆内，但与半经验Cole-Cole松弛模型(/spl alpha//spl sim/0.68)相对拟合。

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ICSE 2000. 2000 IEEE International Conference on Semiconductor Electronics. Proceedings (Cat. No.00EX425)

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