State Key Laboratory of Pulp and Paper Engineering , South China University of Technology , Guangzhou 510641 , China.
Centre for Lignocellulose Science and Engineering and Liaoning Key Laboratory Pulp and Paper Engineering , Dalian Polytechnic University , Dalian 116034 , China.
ACS Appl Mater Interfaces. 2018 Nov 28;10(47):40641-40650. doi: 10.1021/acsami.8b15439. Epub 2018 Nov 13.
Compressible and elastic carbon materials offer many advantages and have promising applications in various electronic devices. However, fabricating carbon materials with super elasticity, fatigue resistance, and high and wide-range linear sensitivity for pressure or strain remains a great challenge. Herein, a facile and sustainable route is developed to fabricate a carbon aerogel with not only superior mechanical performances but also exceptionally high and wide-range linear sensitivity by using chitosan as a renewable carbon source and cellulose nanocrystal as a nanoreinforcement or support. The as-prepared carbon aerogel with wave-shaped layers shows high compressibility, super elasticity, stable strain-current response, and excellent fatigue resistance (94% height retention after 50 000 cycles). More importantly, it demonstrates both an ultrahigh sensitivity of 103.5 kPa and a very wide linear range of 0-18 kPa. In addition, the carbon aerogel has a very low detection limit (1.0 Pa for pressure and 0.05% for strain). The carbon aerogel also can be bended to detect a small angle change. These superiorities render its applications in various wearable devices.
可压缩和弹性碳材料具有许多优点，并在各种电子设备中有广阔的应用前景。然而，制造具有超弹性、耐疲劳性以及对压力或应变具有高且宽线性灵敏度的碳材料仍然是一个巨大的挑战。在此，通过使用壳聚糖作为可再生碳源和纤维素纳米晶体作为纳米增强剂或支撑物，开发了一种简单且可持续的方法来制备具有优异机械性能和极高且宽线性灵敏度的碳气凝胶。所制备的具有波浪形层的碳气凝胶具有高压缩性、超弹性、稳定的电流-应变响应和优异的耐疲劳性（50000 次循环后高度保持率为 94%）。更重要的是，它表现出超高的灵敏度（103.5 kPa）和非常宽的线性范围（0-18 kPa）。此外，该碳气凝胶具有非常低的检测限（压力为 1.0 Pa，应变 0.05%）。该碳气凝胶还可以弯曲以检测小角度变化。这些优势使其在各种可穿戴设备中得到应用。
