Issue 31, 2024

Carbon nanotube cross-linked phosphorus-doped MXene for capacitive pressure microsensors

Abstract

The extreme mechanical flexibility, integration and wearability of one-dimensional carbon-based cross-linked two-dimensional MXenes can exactly meet the rapid development of microelectronic technology and medical microdevices, thereby achieving miniaturization and multi-functionality. Herein, a pressure microsensor was assembled using micro-supercapacitors of phosphorus-doped MXene cross-linked by carbon nanotubes. The carbon nanotube cross-linked phosphorus-doped MXene (P-MXene/CNT) is prepared by chemical vapor deposition and electrostatic self-assembly. The interdigital electrodes are obtained through mask-assisted vacuum filtration to integrate symmetrical micro-supercapacitors using a gel electrolyte. P-doping regulates the electron distribution of the MXene and improves the specific capacity. The P-MXene is cross-linked by carbon nanotubes to alleviate the self-stacking effect for accelerated ion transport. The P-MXene/CNT based planar micro-supercapacitor shows desirable mechanical flexibility and integrability with an extraordinary area capacitance of 162.4 mF cm−2, an energy density of 32.9 μW h cm−2, and a long-term cycling stability up to 91.3% after 10 000 cycles. The pressure microsensor illustrates an outstanding sensitivity toward external pressure and ensures an accurate and continuous detection of human body motions.

Graphical abstract: Carbon nanotube cross-linked phosphorus-doped MXene for capacitive pressure microsensors

Supplementary files

Article information

Article type
Paper
Submitted
11 Jun 2024
Accepted
02 Jul 2024
First published
02 Jul 2024

J. Mater. Chem. A, 2024,12, 19891-19898

Carbon nanotube cross-linked phosphorus-doped MXene for capacitive pressure microsensors

W. Yang, S. Zhu, C. Hao, T. Ji, Y. Liu and Y. Wang, J. Mater. Chem. A, 2024, 12, 19891 DOI: 10.1039/D4TA04029E

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