Design Strategy for Porous Composites Aimed at Pressure Sensor Application

Small - Tập 15 Số 45 - 2019
Zhen Sang1, Kai Ke1, Ica Manas‐Zloczower1
1Department of Macromolecular Science and Engineering Case Western Reserve University 2100 Adelbert Road Cleveland OH 44106-7202 USA

Tóm tắt

Abstract

Flexible and highly sensitive pressure sensors have versatile biomedical engineering applications for disease diagnosis and healthcare. The fabrication of such sensors based on porous structure composites usually requires complex, costly, and nonenvironmentally friendly procedures. As such, it is highly desired to develop facile, economical, and environment‐friendly fabrication strategies for highly sensitive lightweight pressure sensors. Herein, a novel design strategy is reported to fabricate porous composite pressure sensors via a simple heat molding of conductive fillers and thermoplastic polyurethane (TPU) powders together with commercially available popcorn salts followed by water‐assisted salt removal. The obtained TPU/carbon nanostructure (CNS) foam sensors have a linear resistance response up to 60% compressive strain with a gauge factor (GF) of 1.5 and show reversible and reproducible piezoresistive properties due to the robust electrically conductive pathways formed on the foam struts. Such foam sensors can be potentially utilized for guiding squatting exercises and respiration rate monitoring in daily physical training.

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Tập 15 Số 45

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