Giant Dielectric Response in MWCNT/Chitosan Composite Films

被引:1
作者
Han, Jin [1 ]
Wang, Yongfa [1 ]
Ma, Yanran [1 ]
Wang, Chunchang [1 ]
机构
[1] Anhui Univ, Sch Mat Sci & Engn, Lab Dielect Funct Mat, Hefei 230601, Peoples R China
基金
中国国家自然科学基金;
关键词
MWCNT; chitosan; dielectric properties; composite; Maxwell-Wagner relaxation; CONSTANT; NANOPARTICLES; CERAMICS; GAS;
D O I
10.1007/s11664-023-10593-6
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this work, xMWCNT/chitosan composite films with multi-walled carbon nanotubes (MWCNT) as filler and chitosan as matrix were prepared via a solution blending method. Varied content of MWCNT of 0, 0.5 wt.%, 1 wt.% and 1.5 wt.% was investigated. The dielectric properties of the films were investigated in the temperature range of -60 & DEG;C to 60 & DEG;C and frequency range of 10(2)-10(6) Hz. The experimental results show that the incorporation of MWCNT can effectively improve the dielectric properties of the film, with optimal results when the content of MWCNT is close to the percolation threshold. A giant dielectric constant (GDC) was found in all the samples and was studied by dielectric and impedance measurements. Maxwell Wagner relaxation was observed in all samples, which is caused by space charges at different interfaces. The GDC is thought to be related to a Maxwell-Wagner relaxation caused by sample-electrode contact. The addition of MWCNT can enhance the Maxwell-Wagner relaxation. The largest enhancement was found in the sample with 1 wt.% MWCNT.
引用
收藏
页码:6602 / 6612
页数:11
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