碳基气凝胶具有优异的电学性能,使其获得优异的回弹性能可以扩展其在压阻传感器领域的应用。通过定向冷冻干燥法制备了具有单向取向结构的碳纳米管(CNT)/聚乙烯醇(PVA)气凝胶,并通过化学气相沉积法对其进行了表面硅烷改性使其获得优异的压缩回弹性能,从而制备出具有稳定压阻性能的CNT/PVA气凝胶。结果表明:CNT/PVA气凝胶具有显著的各向异性,在取向方向上的电导率为0.27S/m,比垂直于取向方向上高了80%。傅里叶变换红外光谱(FT-IR)证实了硅烷对气凝胶表面改性成功。改性后气凝胶的热稳定性显著提高。经过5次压缩循环后,气凝胶在取向方向和垂直于取向方向上的压缩回线基本重合。CNT/PVA气凝胶展示出了稳定的压阻循环特性,且在垂直于取向方向上产生的电阻变化更为显著。
Carbon-based aerogels possess excellent electrical properties,by endowing them with excellent resilience properties can expand their applications in the field of piezoresistive sensors.Carbon nanotube/polyvinyl alcohol (CNT/PVA) aerogels with unidirectionally oriented structure were prepared by directional freeze-drying.The aerogels were surface silane modified by chemical vapor deposition to obtain excellent compression resilience,thereby prepared CNT/PVA aerogels with stable piezoresistive properties.The results showed that the CNT/PVA aerogel had significant anisotropy.The conductivity in the orientation direction was 0.27S/m,which was 80% higher than that in the direction perpendicular to the orientation.Fourier transform infrared spectroscopy (FT-IR) confirmed the successful surface modification of the aerogels by silane.The thermal stability of the modified aerogels was significantly improved.After 5 compression cycles,the compression loops of the aerogels in the orientation direction and perpendicular to the orientation direction were basically coincident.The CNT/PVA aerogel exhibited stable piezoresistive cycling characteristics,and the resistance changes in the direction perpendicular to the orientation were more significant.
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基金资助
贵阳市科技局贵阳学院专项资金(GYU-KY-〔2022〕);贵州省高等学校集成攻关大平台(黔教合KY字(2020)008);贵州省普通本科高等学校工程研究中心(黔教合KY字[2012]023号);贵州师范学院博士项目(2020BS028);贵州省高等学校先进绿色低维储能材料重点实验室(黔教技[2022]056)
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