Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202008006
Keywords
aerogel; oil/water separation; piezoresistive sensor; polyimide nanofiber
Categories
Funding
- National Natural Science Foundation of China [51803191]
- National Key R&D Program of China [2019YFA0706802]
- Key Scientific and Technological Project of Henan Province, China Postdoctoral Science Foundation [2018M642782]
- Postdoctoral Research Grant in Henan Province [001801007]
- 111 project [D18023]
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The article describes a conductive polyimide nanofiber/MXene composite aerogel with features such as ultralow density, temperature tolerance, superior compressibility, and fatigue resistance, suitable for applications in piezoresistive sensors and oil/water separation.
Inspired by the ultralight and structurally robust spider webs, flexible nanofibril-assembled aerogels with intriguing attributes have been designed for achieving promising performances in various applications. Here, conductive polyimide nanofiber (PINF)/MXene composite aerogel with typical layer-strut bracing hierarchical nanofibrous cellular structure has been developed via the freeze-drying and thermal imidization process. Benefiting from the porous architecture and robust bonding between PINF and MXene, the PINF/MXene composite aerogel exhibits an ultralow density (9.98 mg cm(-3)), intriguing temperature tolerance from -50 to 250 degrees C, superior compressibility and recoverability (up to 90% strain), and excellent fatigue resistance over 1000 cycles. The composite aerogel can be used as a piezoresistive sensor, with an outstanding sensing capacity up to 90% strain (corresponding 85.21 kPa), ultralow detection limit of 0.5% strain (corresponding 0.01 kPa), robust fatigue resistance over 1000 cycles, excellent piezoresistive stability and reproductivity in extremely harsh environments. Furthermore, the composite aerogel also exhibits superior oil/water separation properties such as high adsorption capacity (55.85 to 135.29 g g(-1)) and stable recyclability due to its hydrophobicity and robust hierarchical porous structure. It is expected that the designed PINF/MXene composite aerogel can supply a new multifunctional platform for human bodily motion/physical signals detection and high-efficient oil/water separation.
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