材料科学
气凝胶
压阻效应
复合材料
抗压强度
碳纳米泡沫
碳纤维
复合数
纳米纤维素
收缩率
弹性(物理)
纳米技术
纤维素
化学工程
多孔性
工程类
作者
Wenjie Ye,Liucheng Meng,Jianfeng Xi,Huiyang Bian,Zhaoyang Xu,Huining Xiao,Lei Zhang,Weibing Wu
标识
DOI:10.1016/j.jcis.2024.04.011
摘要
Elastic carbon aerogels have promising applications in the field of wearable sensors. Herein, a new strategy for preparing carbon aerogels with excellent compressive strength and strain, shape recovery, and fatigue resistance was proposed based on the structure design and carbonization optimization of nanocellulose-based precursor aerogels. By the combination of directional freezing and zinc ion cross-linking, bacterial cellulose (BC)/alginate (SA) composite aerogels with high elasticity and compressive strength were first achieved. The existance of zinc ions also significantly improved the carbon retention rate and inhibited structural shrinkage, thus making the carbon aerogels retain ultra-high elasticity and fatigue resistance after compression. Moreover, the carbon aerogel possessed excellent piezoresistive pressure sensing performance with a wide detection range of 0-7.8 kPa, high sensitivity of 11.04 kpa-1, low detection limit (2 % strain), fast response (112 ms), and good durability (over 1,000 cycles). Based on these excellent properties, the carbon aerogel pressure sensors were further successfully used for human motion monitoring, from joint motion to and speech recognition.
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