Novel Linear,Piezoresistive, Auxetic Sensors Coated by AAA Battery Active Carbons with Supreme Sensitivity for Human Body Movement Detection |
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Authors: | Bahman Taherkhani Mahdi Bodaghi Sahar Rahmani Foad Mesgari |
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Affiliation: | 1. Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran;2. Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS UK;3. Faculty of Humanities and Arts, Azad University, Zanjan, Iran;4. Department of Mechanical Engineering, Parsian Higher Education Institute, Qazvin, Iran |
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Abstract: | Herein, a novel strategy for creating low-cost, sustainable, piezoresistive auxetic sensors using the active carbon in consumed AAA batteries, promoting a circular economy, is presented. An auxetic structure with a fixed Poisson's ratio during the strain is designed for sensing. The sensor substrate is silicone RTV2, and the sensing element is the active carbon in AAA batteries chopped to microscale particles using an ultrasonic wave. The sensor mold is designed using Solidworks software and produced using a computer numerical control device and EdgeCam2014 software. The coating process is performed by spraying the prepared particles on the molded auxetic structure and putting the coated auxetic structure under ultraviolet ray to prepare the final sensor. Sensitivity tests are performed, and the results show that the proposed sensor has a better sensitivity of about 1000% and 410% than the previous mixed and layered composite auxetic counterparts. The proposed sensor has linear sensitivity during the strain (estimated with a line with a slope of 0.64) while previous ones have a nonlinear performance (estimated at least with two lines). The sustainable sensor is implemented to detect the movements of the human body, including the movements of the wrist, finger, elbow, and forearm. |
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Keywords: | AAA batteries auxetic sensors linear sensing performances sensory materials wearable sensors |
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