Issue

Vol. 15 (2023)

Highly Ordered Thermoplastic Polyurethane/Aramid Nanofiber Conductive Foams Modulated by Kevlar Polyanion for Piezoresistive Sensing and Electromagnetic Interference Shielding

https://doi.org/10.1007/s40820-023-01062-0
Kunpeng Qian
School of Materials Sciences and Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
Jianyu Zhou
Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, People’s Republic of China
Miao Miao
Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, People’s Republic of China
Hongmin Wu
Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, People’s Republic of China
Sineenat Thaiboonrod
National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Thailand Science Park, Pathum Thani 12120, Thailand
Jianhui Fang
Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, People’s Republic of China
Xin Feng
School of Materials Sciences and Engineering, Shanghai University, Shanghai 200444, People’s Republic of China

Corresponding Author: Xin Feng

fengxin@shu.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 88

Abstract

Highly ordered and uniformly porous structure of conductive foams is a vital issue for various functional purposes such as piezoresistive sensing and electromagnetic interference (EMI) shielding. With the aids of Kevlar polyanionic chains, thermoplastic polyurethane (TPU) foams reinforced by aramid nanofibers (ANF) with adjustable pore-size distribution were successfully obtained via a non-solvent-induced phase separation. In this regard, the most outstanding result is the in situ formation of ANF in TPU foams after protonation of Kevlar polyanion during the NIPS process. Furthermore, in situ growth of copper nanoparticles (Cu NPs) on TPU/ANF foams was performed according to the electroless deposition by using the tiny amount of pre-blended Ti3C2Tx MXene as reducing agents. Particularly, the existence of Cu NPs layers significantly promoted the storage modulus in 2,932% increments, and the well-designed TPU/ANF/Ti3C2Tx MXene (PAM-Cu) composite foams showed distinguished compressive cycle stability. Taking virtues of the highly ordered and elastic porous architectures, the PAM-Cu foams were utilized as piezoresistive sensor exhibiting board compressive interval of 0–344.5 kPa (50% strain) with good sensitivity at 0.46 kPa−1. Meanwhile, the PAM-Cu foams displayed remarkable EMI shielding effectiveness at 79.09 dB in X band. This work provides an ideal strategy to fabricate highly ordered TPU foams with outstanding elastic recovery and excellent EMI shielding performance, which can be used as a promising candidate in integration of satisfactory piezoresistive sensor and EMI shielding applications for human–machine interfaces.


Highlights:


1 Kevlar polyanionic chains induced the formation of highly ordered porous thermoplastic polyurethane foams with adjustable pore sizes.
2 A tiny amount of Ti3C2Tx MXene was performed as reducing agent for the electroless deposition of copper nanoparticles.
3 The conductive foam reinforced by aramid nanofibers exhibited excellent piezoresistive sensing and electromagnetic interference shielding performance.

Keywords

Highly ordered conductive foams MXene Nanofiber Thermoplastic Kevlar polyanion Piezoresistive sensing Electromagnetic interference shielding
Qian, Kunpeng, Jianyu Zhou, Miao Miao, Hongmin Wu, Sineenat Thaiboonrod, Jianhui Fang, and Xin Feng. 2023. “Highly Ordered Thermoplastic Polyurethane/Aramid Nanofiber Conductive Foams Modulated by Kevlar Polyanion for Piezoresistive Sensing and Electromagnetic Interference Shielding”. Nano-Micro Letters 15 (April):88. https://doi.org/10.1007/s40820-023-01062-0.
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