Abstract
The flexible and wearable capacitive sensors have captured tremendous interest due to their enormous potential for healthcare monitoring, soft robotics, and human−computer interface. However, despite recent progress, there are still pressing challenges to develop a fully integrated textile sensor array with good comfort, high sensitivity, multisensing capabilities, and ultra-light detection. Here, we demonstrate a pressure and non-contact bimodal fabric-only capacitive sensor with highly sensitive and ultralight detection. The graphene nanoplatelets-decorated multidimensional honeycomb fabric and nickel-plated woven fabric serve as the dielectric layer and electrode, respectively. Our textile-only capacitive bimodal sensor exhibits an excellent pressure-sensing sensitivity of 0.38 kPa−1, an ultralow detection limit (1.23 Pa), and cycling stability. Moreover, the sensor exhibits superior non-contact detection performance with a detection distance of 15 cm and a maximum relative capacitance change of 10%. The sensor can successfully detect human motion, such as finger bending, saliva swallowing, etc. Furthermore, a 4 × 4 (16 units) textile-only capacitive bimodal sensor array was prepared and has excellent spatial resolution and response performance, showing great potential for the wearable applications.
Highlights
Flexible and wearable electronic devices with various functionality and suitability for the human body have recently attracted considerable research interest with the rapid growth of artificial intelligence [1,2,3]
An urgent problem still exists for capacitive sensors to simultaneously achieve flexibility, wearability, comfort, and excellent multifunctional sensing capabilities
The honeycomb fabric is prepared by a polyethylene terephthalate (PET) fiber, which is a kind of high molecular compound produced by esterification polycondensation of monoethylene glycol
Summary
Flexible and wearable electronic devices with various functionality and suitability for the human body have recently attracted considerable research interest with the rapid growth of artificial intelligence [1,2,3]. For improving the flexibility and wearability of the capacitive sensors, polymer elastomers, including polydimethylsiloxane (PDMS) [18], polyethylene terephthalate (PET) [19], polyimide (PI) [20], polyvinyl alcohol (PVA) [21], Eco-flex, and polyvinylidene fluoride (PVDF) [22,23], are often used to prepare the flexible electrodes and dielectric layers [24,25]. Their pressure sensitivity performance still needs further improvement. Flexible capacitive sensors with high breathability are still necessary for the improvement of comfort and durability
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