朗缪尔铁电聚合物薄膜的电学特性:高热释电系数和低介电常数
ELECTRIC CHARACTERISTICS OF LANGMUIR-BLODGETT FERROELECTRIC POLYMERS FILM: HIGH YROELECTRIC COEFFICIENT AND LOW DIELECTRIC CONSTANT
摘要 研究了利用朗缪尔技术(LB)生长在柔性基底上的聚偏氟乙烯和三氟乙烯的共聚物(P(VDF-TrFE))薄膜的电学性质.通过测量相对介电常数和热释电系数,发现薄膜在室温1kHz时的优值因子达到1.4 Pa~(-1/2).这表明利用LB技术生长的P(VDF-TrFE)薄膜是热释电探测器的优良候选材料.优值因子的提高可能来源于LB薄膜的良好结晶性和分子链在平面内的高度有序性.
Abstract:
The relative dielectric constant ε' and pyroelectric coefficient p of ferroelectric poly(vinylidene fluoride-trifluoroethylene) polymers P(VDF-TrFE) films grown on flexible substrates by Langmuir-Blodgett (LB) technique were measured, and room temperature figure of merit was obtained as 1.4 Pa~(-1/2)at 1kHz. The result implies that LB P(VDF-TrFE) copolymer films are potential materials for pyroelectric detectors. This enhancement of figure of merit could be attributed to good crystallinity and highly planar ordered molecular chains in the LB films.
Author: LIU Pu-Feng WANG Jian-Lu TIAN Li MENG Xiang-Jian CHU Jun-Hao
作者单位: 中国科学院上海技术物理研究所,红外物理国家重点实验室,上海,200083
刊 名 红外与毫米波学报 ISTICEISCIPKU
年,卷(期): 2009, 28(6)
分类号: PM22+1
机标分类号: O4 TQ3
在线出版日期: 2010年3月16日
基金项目: 国家自然科学基金,上海市自然科学基金