期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 6, 页码 7477-7485出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21698
关键词
self-assembly; alignment; carbon nanotubes; electromagnetic interference shielding; capillary effect
资金
- National Key Research and Development Program of China [2018YFC2000900]
- Fundamental Research Funds for the Central Universities [2232018D3-06]
- Key Lab of Material Chemistry for Energy Conversion and Storage of Ministry of Education, Huazhong University of Science and Technology
Conductive coatings show great promise for next-generation electromagnetic interference (EMI) shielding challenges on textile; however, their stringent requirements for electrical conductivity are difficult to meet by conventional approaches of increasing the loading and homogeneity of conductive nanofillers. Here, the axial alignment of carbon nanotubes (CNTs) on fibers that were obtained by spontaneous capillary-driven self-assembly is shown on commercial cotton fabrics, and its great potential for EMI shielding is demonstrated. The aligned CNTs structurally optimize the conductive network on fabrics and yield an 81-fold increase in electrical conductivity per unit of CNT, compared with the disordered CNT microstructure. The high-efficiency electrical conductivity allows a several-micron-thick coating on insulating fabrics to endow an EMI shielding effectiveness of 21.5 dB in the X band and 20.8 dB in the Ku band, which meets the standard shielding requirement in commercial applications. It is among the minimum reported thicknesses for conductive nanocomposite coatings to date. Moreover, the coated fabrics with aligned CNTs possess a desirable stability upon bending, scratching, stripping, and even washing, which is attributed to the dense CNT packing in the aligned microarchitecture. This work presents the anisotropic structure on large areas by self-assembly, offering new opportunities for next-generation portable and wearable electronic devices.
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