Wireless smartphone assisted personal healthcare monitoring system using MoS<sub>2</sub> based flexible, wearable and ultra-low cost functional sensor

Shinde, Akash and Sahatiya, Parikshit and Kadu, Anand and Badhulika, Sushmee (2019) Wireless smartphone assisted personal healthcare monitoring system using MoS<sub>2</sub> based flexible, wearable and ultra-low cost functional sensor. Flexible and Printed Electronics. ISSN 2058-8585

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Abstract

Flexible, wearable, functional sensors that can quantify electrical signals generated by human activities are of great importance in personal healthcare monitoring. However, the high fabrication cost of these sensors along with the unreliable frontend processing of data restricts their widespread usage. In this report, we demonstrate the MoS2 growth on Al foil which was further integrated onto eraser substrate to develop smart, low cost motion sensors (pedometer and gesture communication) and breath sensor by measuring physiological parameters such as strain, touch, hydration levels of lungs respectively. The data generated is wirelessly transmitted to the smartphone via Bluetooth and analysed using dedicated android applications for individual sensing displays. For pedometer, the fabricated sensor was integrated onto the knee which could then calculate the steps taken, distance covered, speed and the approximate calories burnt by the individual. Gesture communication helps the deaf/dumb/paralyzed individuals to communicate with external environment using finger movements. Breath sensing allows for the early detection of lung diseases by monitoring the hydration levels of the lungs and further the piezotronic effect of MoS2 on breath sensing was systematically studied where 56.8% increase in the response was observed under 16% strain. The sensing mechanism for each stimulus is explained via modulation in the charge transport properties for each stimulus. The sensor exhibited excellent durability where the device performance was found to be stable even after continuous 500 bending cycles. The successful demonstration of such low cost functional wireless personal healthcare monitoring system for Internet of Things (IoT) applications is a major step ahead in flexible and wearable electronics

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