On-Demand MXene-Coupled Pyroelectricity for Advanced Breathing Sensors and IR Data Receivers.
Langmuir
; 40(17): 8897-8910, 2024 Apr 30.
Article
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| MEDLINE
| ID: mdl-38626396
ABSTRACT
MXene-inspired two-dimensional (2D) materials like Ti3C2Tx are widely known for their versatile properties, including surface plasmon, higher electrical conductivity, exceptional in-plane tensile strength, EMI shielding, and IR thermal properties. The MXene nanosheets coupled poly(vinylidene fluoride) (PVDF) nanofibers with d33 â¼-26 pm V-1 are able to capture the smaller thermal fluctuation due to a superior pyroelectric coefficient of â¼130 nC m-2 K-1 with an improved (â¼7 times with respect to neat PVDF nanofibers) pyroelectric current figure of merit (FOMi). The significant enhancement of the pyroelectric response is attributed to the confinement effect of 2D MXene (Ti3C2Tx) nanosheets within PVDF nanofibers, as evidenced from polarized Fourier transform infrared (FTIR) spectroscopy and scanning probe microscopy (SPM). In subsequent studies, the practical applications of self-powered pyroelectric sensors of MXene-PVDF have been demonstrated. The fabricated flexible, hydrophobic pyroelectric sensor could be utilized as an excellent pyroelectric breathing sensor, a proximity sensor, and an IR data transmission receiver. Further, supervised machine learning algorithms are proposed to distinguish different types of breathing signals with â¼98% accuracy for healthcare monitoring purposes.
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