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Abstract
Advanced physical sensors based on carbon nanotube/polydimethylsiloxane (CNT/PDMS) nanocomposites have recently attracted much attention for potential applications such as wearable and flexible electronic devices. In this work, a CNT/PDMS sponge was fabricated and their capacitive as well as resistive response was investigated by impedance characterization with an equivalent circuit model. The newly defined gauge factor, which considers simultaneously both the piezocapacitive and piezoresistive effects of CNT/PDMS sponge sensors, showed a significantly improved sensitivity. This work provides important information for a better understanding of CNT/PDMS nanocomposites and their sensing performance.
Highlights
Advanced physical sensors that can detect pressure, strain, and torsion have attracted much attention with increasing demand of mobile devices and the internet of things (IoT)
PDMS sponges with porous structures and flexible skeleton have many advantages such as biocompatibility, high elasticity, high compressibility, large surface area-to-volume ratio, and good stability for high-performance sensors
The morphology of as-prepared CNT/PDMS sponges was characterized by micro-CT and scanning electron microscopy (SEM)
Summary
Advanced physical sensors that can detect pressure, strain, and torsion have attracted much attention with increasing demand of mobile devices and the internet of things (IoT). Good stability, biocompatibility, portability, flexibility, and stretchability are key requirements of sensors for diverse applications such as wearable electronics, electronic skins, soft robotics, and healthcare monitoring devices.. Good stability, biocompatibility, portability, flexibility, and stretchability are key requirements of sensors for diverse applications such as wearable electronics, electronic skins, soft robotics, and healthcare monitoring devices.1–3 Substrates such as polycarbonate (PC), polyethylene terephthalate (PET), and polydimethylsiloxane (PDMS) have been used with diverse nanomaterials as active sensing elements to fulfill the requirements.. Physical sensors were fabricated from the CNT/PDMS sponge and their electrical properties were investigated with an equivalent circuit model deduced by impedance characterization Both capacitive and resistive properties were significantly influenced by mechanical deformation of a fabricated CNT/PDMS sponge, and an improved sensing method was suggested based on those results. The contact resistance (Rs) effect between metal electrodes and a CNT/PDMS sponge was discussed
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