用于电磁干扰屏蔽的超薄多壁碳纳米管/碳化钛复合薄膜

Weng Chuanxin, He Junzhe, Tian Jiangxiao, Wu Wei, Li Jinjin, Zhang Jiulin, Yu Haitao, Zhang Xuechuan, Lu Mingming

National Key Laboratory of Scattering and Radiation, Beijing 100854, China.

Nanomaterials (Basel). 2024 Dec 25;15(1):6. doi: 10.3390/nano15010006.

The disordered assembly and low conductivity of carbon nanotubes are the main problems that limit the application of electromagnetic interference (EMI) shielding. In this work, an ordered lamellar assembly structure of multiwalled carbon nanotube/TiCT (MWCNT/TiCT) hybrid films was achieved by vacuum-assisted filtration through the hybridization of TiCT nanosheets and carbon nanotubes, where carbon nanotubes were tightly sticking on the surface of TiCT nanosheets via physical adsorption and hydrogen bonding. Compared with the pure carbon nanotubes films, the hybrid MWCNT/TiCT films achieved a significant improvement in conductivity of 452.5 S/cm and EMI shielding effectiveness (SE) of 44.3 dB under 50 wt% TiCT with a low thickness (8.6 μm) and orderly lamellar stacking structure, which finally resulted in high specific SE (SSE/t, SE divided by the density and thickness) of 55,603.1 dB∙cm∙g.

碳纳米管的无序组装和低导电性是限制电磁干扰（EMI）屏蔽应用的主要问题。在这项工作中，通过TiCT纳米片与碳纳米管的杂化，采用真空辅助过滤法实现了多壁碳纳米管/TiCT（MWCNT/TiCT）杂化膜的有序层状组装结构，其中碳纳米管通过物理吸附和氢键紧密附着在TiCT纳米片表面。与纯碳纳米管薄膜相比，在50 wt% TiCT、低厚度（8.6μm）和有序层状堆叠结构的条件下，MWCNT/TiCT杂化膜的导电性显著提高至452.5 S/cm，电磁干扰屏蔽效能（SE）达到44.3 dB，最终获得了55,603.1 dB∙cm∙g的高比屏蔽效能（SSE/t，SE除以密度和厚度）。