Ni Qing-Qing, Zhu Yao-Feng, Yu Lu-Jun, Fu Ya-Qin
Key Laboratory of Advanced Textile Materials and Manufacturing Technology of the Ministry of Education, Zhejiang Sci-Tech University, No.928 Second Avenue Xiasha Higher Education Zone, Hangzhou, 310018 People's Republic of China.
Key Laboratory of Advanced Textile Materials and Manufacturing Technology of the Ministry of Education, Zhejiang Sci-Tech University, No.928 Second Avenue Xiasha Higher Education Zone, Hangzhou, 310018 People's Republic of China ; National Engineering Lab for Textile Fiber Materials and Processing Technology, Zhejiang Sci-Tech University, No.928, Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018 People's Republic of China.
Nanoscale Res Lett. 2015 Apr 11;10:174. doi: 10.1186/s11671-015-0875-6. eCollection 2015.
Multiple-phase nanocomposites filled with carbon nanotubes (CNTs) have been developed for their significant potential in microwave attenuation. The introduction of other phases onto the CNTs to achieve CNT-based heterostructures has been proposed to obtain absorbing materials with enhanced microwave absorption properties and broadband frequency due to their different loss mechanisms. The existence of polyaniline (PANI) as a coating with controllable electrical conductivity can lead to well-matched impedance. In this work, a one-dimensional CNT@BaTiO3@PANI heterostructure composite was fabricated. The fabrication processes involved coating of an acid-modified CNT with BaTiO3 (CNT@BaTiO3) through a sol-gel technique followed by combustion and the formation of CNT@BaTiO3@PANI nanohybrids by in situ polymerization of an aniline monomer in the presence of CNT@BaTiO3, using ammonium persulfate as an oxidant and HCl as a dopant. The as-synthesized CNT@BaTiO3@PANI composites with heterostructures were confirmed by various morphological and structural characterization techniques, as well as conductivity and microwave absorption properties. The measured electromagnetic parameters showed that the CNT@BaTiO3@PANI composites exhibited excellent microwave absorption properties. The minimum reflection loss of the CNT@BaTiO3@PANI composites with 20 wt % loadings in paraffin wax reached -28.9 dB (approximately 99.87% absorption) at 10.7 GHz with a thickness of 3 mm, and a frequency bandwidth less than -20 dB was achieved from 10 to 15 GHz. This work demonstrated that the CNT@BaTiO3@PANI heterostructure composite can be potentially useful in electromagnetic stealth materials, sensors, and electronic devices.
由于其在微波衰减方面的巨大潜力，已开发出填充有碳纳米管（CNT）的多相纳米复合材料。有人提出在碳纳米管上引入其他相以实现基于碳纳米管的异质结构，从而获得具有增强微波吸收性能和宽带频率的吸收材料，因为它们具有不同的损耗机制。聚苯胺（PANI）作为一种具有可控电导率的涂层，其存在可导致阻抗良好匹配。在这项工作中，制备了一维CNT@BaTiO3@PANI异质结构复合材料。制备过程包括通过溶胶 - 凝胶技术用BaTiO3涂覆酸改性的碳纳米管（CNT@BaTiO3），然后进行燃烧，并在CNT@BaTiO3存在下，以过硫酸铵作为氧化剂，HCl作为掺杂剂，通过苯胺单体的原位聚合形成CNT@BaTiO3@PANI纳米杂化物。通过各种形态和结构表征技术以及电导率和微波吸收性能，证实了所合成的具有异质结构的CNT@BaTiO3@PANI复合材料。测量的电磁参数表明，CNT@BaTiO3@PANI复合材料表现出优异的微波吸收性能。在石蜡中负载量为20 wt％的CNT@BaTiO3@PANI复合材料在10.7 GHz频率下，厚度为3 mm时，最小反射损耗达到 - 28.9 dB（约99.87％吸收），并且在10至15 GHz范围内实现了小于 - 20 dB的频率带宽。这项工作表明，CNT@BaTiO3@PANI异质结构复合材料在电磁隐身材料、传感器和电子设备中可能具有潜在用途。
