Compressible, Elastic, and Pressure-Sensitive Carbon Aerogels Derived from 2D Titanium Carbide Nanosheets and Bacterial Cellulose for Wearable Sensors,Chemistry of Materials

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Compressible, Elastic, and Pressure-Sensitive Carbon Aerogels Derived from 2D Titanium Carbide Nanosheets and Bacterial Cellulose for Wearable Sensors
Chemistry of Materials ( IF 7.2 ) Pub Date : 2019-04-16 00:00:00 , DOI: 10.1021/acs.chemmater.9b00259
Zehong Chen ₁ , Yijie Hu ₁ , Hao Zhuo ₁ , Linxiang Liu ₁ , Shuangshuang Jing ₁ , Linxin Zhong ₁ , Xinwen Peng ₁ , Run-cang Sun ₂

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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.

中文翻译：

源自2D碳化钛纳米片和可穿戴传感器的细菌纤维素的可压缩，弹性和压敏碳气凝胶。

可压缩弹性碳气凝胶（CECA）在可穿戴电子产品和电子皮肤中的应用前景广阔。MXenes作为具有特殊性能的新型二维材料，是用于压阻传感器的有前途的材料。但是，MXene纳米片之间缺乏足够的相互作用，使得难以使用它们来制造CECA。在此，通过使用细菌纤维素纤维作为纳米粘合剂连接MXene（Ti ₃ C ₂纳米片成连续的和波浪状的薄片。薄片是高度柔性和弹性的，并且这些薄片的定向排列导致CECA具有超压缩性和弹性。其超高的结构稳定性可在超过100个循环中承受99％的极高应变，并在至少100000个循环中以50％应变承受长期压缩。此外，它具有很高的灵敏度，不仅显示出超高的线性度，而且还显示了宽广的工作压力范围（0-10 kPa）。特别是，CECA在几乎整个工作应变范围内（0–95％）都具有很高的线性灵敏度。此外，它对于微小的应变和压力具有非常低的检测极限。这些功能使基于CECA的传感器成为灵活的可穿戴设备，可以监视人体的细微和大生物信号。

更新日期：2019-04-16

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