Zhengzhou University/Nano Energy Institute AFM: Lightweight, superelastic, hydrophobic polyimide nanofiber/MXene composite aerogel for wearable piezoresistive sensors and oil-water separation applicat

Inspired by the ultra-light and strong structure of spider webs, the flexible nanofiber assembled aerogel with excellent properties has been carefully designed to achieve ideal performance in a variety of applications.



In view of this, Professor Liu Chuntai and Associate Professor Liu Hu of Zhengzhou University, and Pan Caofeng from the Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences, and others have developed a typical "layer-pillar" through freeze-drying and thermal imidization processes. Conductive polyimide nanofiber (PINF)/MXene composite aerogel supporting layered nanofiber porous structure.

Highlights of this article

1) Thanks to the porous structure and strong combination between PINF and MXene, the PINF/MXene composite aerogel has a very low density (9.98 mg cm-3), and high temperature resistance of -50~250°C. Excellent compressibility and recoverability (up to 90% strain), and excellent fatigue resistance in 1000 cycles.

2) The composite aerogel can be used as a piezoresistive sensor, with an excellent sensing ability of up to 90% strain (corresponding to 85.21 kPa), an ultra-low detection limit strain of 0.5% strain (corresponding to 0.01 kPa), in 1000 cycles It has strong fatigue resistance, excellent varistor stability and stability and reproducibility under extreme harsh environments.



3) In addition, composite aerogel also has excellent oil/water separation characteristics, such as high adsorption capacity (55.85~135.29 g g-1) and stable recyclability, which is attributed to its hydrophobicity and strong hierarchical porosity structure.

In short, the designed PINF/MXene composite aerogel is expected to provide a new multifunctional platform for human motion/physical signal detection and efficient oil/water separation.



references:

Hu Liu et al. Lightweight, Superelastic, and Hydrophobic Polyimide Nanofiber /MXene Composite Aerogel for Wearable Piezoresistive Sensor and Oil/Water Separation Applications. Advanced Functional Materials, 2021.

DOI: 10.1002/adfm.202008006

https://doi.org/10.1002/adfm.202008006


Source of information: Wonders

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