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Indexed by:Journal Papers

Date of Publication:2019-12-15

Journal:MATERIALS & DESIGN

Included Journals:EI、SCIE

Volume:184

ISSN No.:0264-1275

Key Words:Carbon nanotube; Dispersion; Buckypaper; Mechanical property; Electromagnetic interference shielding

Abstract:In order to prepare multi-wall carbon nanotube (MWCNT) buckypapers (BPs) with excellent comprehensive properties, an investigation was conducted regarding the effect of dispersing medium on CNT dispersions and resultant BPs. Three types of MWCNTs with different lengths and diameters, denoted as CNT-A, CNT-B and CNT-C, were dispersed into water, ethanol and 1-methyl-2-pyrrolidone, respectively. The dispersion stability was monitored by UV-vis spectroscopy and conductivity meter. The results showed that all MWCNT/water dispersions were far superior to MWCNT/ethanol dispersion in stability, but slightly inferior in monodispersity. Subsequently, BPs prepared by vacuum filtration using the above-mentioned dispersions were investigated to clarify the pore structure, electrical, mechanical and electromagnetic shielding properties. Compared with BPs prepared with CNT-A/ethanol dispersion (BP-A-E), the BP prepared with CNT-A/water dispersion (BP-A-W) showed smaller pore size, and exhibited significantly improvement in electrical conductivity (74%), strength (665%). A super high absorption-dominated electromagnetic interference shielding effectiveness (SE) of 101.7 dB was achieved by BP-A-W of 450 mm thick in the range of 8.2-18 GHz, which was 26% higher than that of BP-A-E. A notable SE of 48.4 dB and a high specific SE of 29,300 dB$cm(2)/g were obtained by BP of 45 mm thick prepared with CNT-C/water dispersion. (C) 2019 The Authors. Published by Elsevier Ltd.