Abstract
Three-dimensional (3D) carbon nanotube-based porous networks have received considerable attention as active nanomaterials for flexible/wearable sensor applications due to their excellent conductivity and mechanical flexibility. Herein, ultralight, biocompatible, and conductive SWCNT/tannic acid (TA) and Mg2+/SWCNT/TA aerogels have been facilely fabricated using TA as a dispersion reagent and crosslinker and Mg2+ to introduce a metal–phenolic network. The construction of a SWCNT@TA core–shell structure and the low CNT concentration of SWCNT/TA3:3 contribute to a high linear sensitivity of 432 kPa–1 in a wide pressure range (0.014–28 kPa), while Mg2+ modulation endows Mg2+/SWCNT/TA1:1 with an ultrahigh linear sensitivity of 13662 kPa–1 in a pressure range of 0.014–1.05 kPa. The superior sensing performance of as-prepared aerogels, including high sensitivity, wide working range, low detection limit (14 Pa), and fast stimuli-response (200–300 ms), enables them to detect tiny changes in human biosignals and imperceptible vibration, which show great potential in applications of health monitoring, human–machine interfaces, and various flexible electronics.
Published Version
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