High conductivity, percolation behavior and dielectric relaxation of hybrid ZIF-8/CNT composites

被引:44
作者
Cheng, Lei [1 ]
Yan, Puxuan [1 ]
Yang, Xiulin [1 ]
Zou, Huahong [1 ]
Yang, Hu [1 ]
Liang, Hong [1 ]
机构
[1] Guangxi Normal Univ, Sch Chem & Pharmaceut Sci, State Key Lab Chem & Mol Engn Med Resources, Guilin 541004, Peoples R China
基金
中国国家自然科学基金;
关键词
Conductivity; Percolation behavior; Dielectric relaxation; Hybrid composites; ZIF-8; METAL-ORGANIC FRAMEWORKS; ZEOLITIC IMIDAZOLATE FRAMEWORKS; CARBON NANOTUBES; RAMAN; NANOCOMPOSITES; SPECTROSCOPY; DIOXIDE;
D O I
10.1016/j.jallcom.2020.154132
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The electrical behavior of hybrid ZIF-8/conducting composites remains poorly understood. Here, the hybrid ZIF-8/CNT composites are synthesized by an in situ growth of ZIF-8 on carbon nanotubes (CNT). The crystal structure, morphology and dielectric properties of the composites were investigated. Dielectric permittivity of as-prepared composites is improved more than 10 times by introduced CNT. The composites have a low percolation threshold (3.2%), where the dc conductivity increases by 4-5 orders of magnitude near the percolation threshold. Furthermore, we find three dielectric relaxation processes in the as-prepared ZIF-8 and ZIF-8/1%CHT composite by electrical modulus. One low-frequency dielectric relaxation associates with Maxwell-Wagner effect between composites and electrodes, while the two high-frequency dielectric relaxation attributes to the short-range hopping process of carries or dipoles orientation. The work provides deep insights on the intrinsic and extrinsic dielectric responses of ZIF-8 based composites and on the percolation behavior of hybrid ZIF-8/conducting materials composites. (C) 2020 Elsevier B.V. All rights reserved.
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页数:8
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