Compressible, Elastic, and Pressure-Sensitive Carbon Aerogels Derived from 2D Titanium Carbide Nanosheets and Bacterial Cellulose for Wearable Sensors
Compressible, Elastic, and Pressure-Sensitive Carbon Aerogels Derived from 2D Titanium Carbide Nanosheets and Bacterial Cellulose for Wearable Sensors
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DOI：
10.1021/acs.chemmater.9b00259
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发表时间：
2019-05-14
影响因子：
8.6
通讯作者：
Sun, Run-cang
中科院分区：
文献类型：
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作者：
Chen, Zehong;Hu, Yijie;Sun, Run-cang
可压缩和弹性碳气凝胶（CECAs）在可穿戴电子产品和电子皮肤中具有很大的应用前景。MXenes作为一种新型二维材料，具有优异的性能，是压阻式传感器的理想材料。然而，MXene纳米片之间缺乏足够的相互作用使得它们难以用于制造ceca。本文采用细菌纤维素纤维作为纳米粘合剂，将MXene （Ti3C2）纳米片连接成连续的波浪形片层，制备了轻质CECA。片层具有高度的柔性和弹性，这些片层的定向排列导致了具有超压缩性和弹性的CECA。其超高的结构稳定性可以承受99%的极高应变超过100次循环和50%应变的长期压缩至少10万次循环。此外，它具有高灵敏度，不仅具有超高的线性度，而且具有宽的工作压力范围（0-10 kPa）。特别是，CECA在几乎整个可工作应变范围内（0-95%）具有很高的线性灵敏度。此外，它对微小的应变和压力具有很低的检测限。这些特点使基于ceca的传感器成为一种灵活的可穿戴设备，可以监测人体的细微和大的生物信号。
Compressible and elastic carbon aerogels (CECAs) hold great promise for applications in wearable electronics and electronic skins. MXenes, as new two-dimensional materials with extraordinary properties, are promising materials for piezoresistive sensors. However, the lack of sufficient interaction among MXene nanosheets makes it difficult to employ them to fabricate CECAs. Herein, a lightweight CECA is fabricated by using bacterial cellulose fiber as a nanobinder to connect MXene (Ti3C2) nanosheets into continuous and wave-shaped lamellae. The lamellae are highly flexible and elastic, and the oriented alignment of these lamellae results in a CECA with super compressibility and elasticity. Its ultrahigh structural stability can withstand an extremely high strain of 99% for more than 100 cycles and long-term compression at 50% strain for at least 100 000 cycles. Furthermore, it has a high sensitivity that demonstrates not only an ultrahigh linearity but also a broad working pressure range (0-10 kPa). In particular, the CECA has a high linear sensitivity in almost the entire workable strain range (0-95%). In addition, it has very low detection limits for tiny strain and pressure. These features enable the CECA-based sensor to be a flexible wearable device to monitor both subtle and large biosignals of the human body.