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Ultrasensitive and Highly Compressive Piezoresistive Sensor Based on Biopolyol-Reinforced Polyurethane Sponge Coated with Silver Nanoparticles and Carbon Nanotubes/Cellulose Nanocrystals

Abstract

Wearable, lightweight and wide-range detecting piezoresistive sensor is highly desired for the development of flexible electronic industry. However, it is still a great challenge to fabricate piezoresistive sensor with both wide sensing range and high sensitivity. In this study, we prepared a biopolyol-reinforced self-healing polyurethane sponge containing reversible oxime-carbamate bonds for the first time. Based on this sponge, a lightweight piezoresistive sensor based on silver nanoparticles/carbon nanotubes-cellulose nanocrystals and tannic acid decorated polyurethane (AgNPs/CNTs-CNCs@TA-PU) sponge was obtained through simple repeated dipping-drying procedures. The resultant conductive AgNPs/CNTs-CNCs@TA-PU sponge exhibits wide compressive stress range (0~788.3 kPa), superior sensitivity and exceptional durability. Owing to the presence of dynamic oxime-carbamate bonds in sponge matrix, the conductive sponge can be self-healed by heating at 110 ℃ for 1 h and shows a self-healing efficiency of 80.3%. More importantly, this conductive sponge is sensitive enough, and its gauge factor is as high as 17.1 in the compressive strain range of 0~1% due to the microcrack structure and fractured skeletons. Finally, we demonstrated the applications of the as-prepared AgNPs/CNTs-CNCs@TA-PU sponge-based piezoresistive sensor in human motion monitoring and detecting water droplets, indicating its potential for wearable electronics and artificial intelligence.

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Supplementary files

Article information


Submitted
31 Aug 2020
Accepted
11 Oct 2020
First published
15 Oct 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

Ultrasensitive and Highly Compressive Piezoresistive Sensor Based on Biopolyol-Reinforced Polyurethane Sponge Coated with Silver Nanoparticles and Carbon Nanotubes/Cellulose Nanocrystals

Q. Yan , W. Xie , M. Zhou and H. Fu, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/D0TC04141F

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