Room-Temperature Dielectric Switchable Nanocomposites

被引：39

作者：

Meng, Peng ^{[1
]}

Zhang, Quan ^{[1
]}

Wu, Yulong ^{[1
]}

Tan, Zhiyuan ^{[1
]}

Cheng, Guoan ^{[1
,2
]}

Wu, Xiaoling ^{[1
,2
]}

Zheng, Ruiting ^{[1
,2
]}

机构：

[1] Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Radiat Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China

[2] Beijing Radiat Ctr, Beijing 100875, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2017年 / 27卷 / 30期

基金：

中国国家自然科学基金;

关键词：

carbon nanotubes; composites; dielectric switches; room temperature materials; phase changes; WALLED CARBON NANOTUBES; ELECTRICAL-PROPERTIES; PHASE-TRANSITION; COMPOSITES; FABRICATION; DISPERSION; MOLECULES; CRYSTALS; BEHAVIOR; ORIGIN;

D O I：

10.1002/adfm.201701136

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Room-temperature switchable dielectric materials are of interest for many applications, including solar energy storage, smart switches, automatic filters, and next-generation sensors. Here, a temperature-triggered dielectric switchable nanocomposite by dispersing octadecylamine-grafted multiwalled carbon nanotubes (ODA-MWCNTs, for short) into hexadecane is reported. The composite has low permittivity at molten state and high permittivity at frozen state, and the permittivity switch is triggered around 18 degrees C. The highest permittivity contrast ratio reaches 106.4 at 2.0% CNT volume fraction. The composite shows frequency-sensitive and temperature-ramping-rate-sensitive properties. Further investigation indicates that the permittivity switch is caused by the change of the ODA-MWCNT percolating networks during phase transition.

引用

页数：8

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