Abstract
Herein, a flexible 6 × 6 pressure-sensitive array (based on the PDMS (Polydimethylsiloxane) porous substrate) was designed. We have developed a facile method to fabricate the porous substrate, by a single-step operation using the sugar-template method. This strategy effectively diminishes the complexity of the preparation process, as well as the device structure. The electrical resistivity of the stretchable array demonstrates the negative piezo resistive coefficient (NPRC) under 0–100 kpa. Moreover, the pressure-sensitive array reveals a high sensitivity and low delay time (<0.5 s) to the applied forces. Therefore, the pressure distribution could be easily recognized by testing its conductivity changes. Besides, these signal data can be collected into the upper computer, with the purpose of tracking and analyzing the azimuth of the applied loading. This cost-effective micro array has a broad application prospect for fabricating the tactile sensor, artificial skin, and human-computer interfaces.
Highlights
After years of development, mechanical sensors made up of elastomeric rubber and nano-sized conductive filler have been exploited as candidates, so as to fabricate flexible, resistive-type mechanical sensors
Due to the ease and low-cost of fabrication, as well as the simple signal conversion and readout mechanism, resistive-type mechanical sensors have been widely employed for the purpose of realizing cost-effective, wearable electronics
The graphene-coated foams (GCF) sample has merits over the additive-free graphene-assembled monoliths (GM), especially when it is used as the backbone give rise morphology to a well-defined morphology in small dimension
Summary
Mechanical sensors made up of elastomeric rubber and nano-sized conductive filler have been exploited as candidates, so as to fabricate flexible, resistive-type mechanical sensors. Composites with graphene-supported polymer coating have been proved to have great potential in flexible electronics, such as flexible pressure sensors [1], artificial skin [2], and wearable electronics [3], for the reason that they only require two components: piezo-resistive material and an electrode. Even if these explorations of functional materials for sensing applications have made some achievements, the fabrication of the pressure sensor arrays towards practical applications is still a challenging task. There are two effective methods to achieve high sensitivity: utilizing the sensitive op-amp input transistors to amplify signals, and measuring strain changes in the capacitance
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