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Microstructured Scales in Porous Piezoresistive Vibration Sensor with Strain-Rate-Adaptive Gauge Factor
Journal
Macromolecular Materials and Engineering
ISSN
14387492
Date Issued
2022-09-01
Author(s)
Korrapati, Mallikarjuna
Chauhan, Sunita
Tang, Yunlong
Gupta, Dipti
Abstract
Flexible vibration sensors extend vibration sensor applications to wearable devices that can detect the body's mechano-vibration signatures. In addition, the sensors act as a good interface in the curved shapes of machinery for better measurement. Such flexible vibration sensors that comprise ultrahigh displacement sensitivity and good dynamic response can be developed by using highly sensitive mechanisms such as crack-based sensors (CBS) or hair-like sensors (HLS). In this work, a porous piezoresistive sensor is fabricated by coating porous poly-dimethyl siloxane (PDMS) with graphene elastomer ink to create a conductive network in the porous structure. Squamous microstructured scales are observed on the pore walls due to a coating of graphene elastomer ink on the expanded porous structure and contracting back to its original shape. It is assumed that the scales on the pore walls impact electromechanical characterization by imparting strain-rate adaptability and dynamic resistance. Additionally, the developed sensors display a highly distinct segmented gauge factor in different strain rates in quasi-static characterization, and the gauge factor increases proportionally to the strain rate. Consequently, the sensor can detect vibrations in a bandwidth of 1–1000 Hz and respond to acceleration from 0.01–1.01 g.
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