2D-SnSe<sub>2</sub> Nanosheet Functionalized Piezo-resistive Flexible Sensor for Pressure and Human Breath Monitoring
Mohit Tannarana, G. K. Solanki, Sanjay A. Bhakhar, Kirit D. Patel, V. M. Pathak, Pratik M. Pataniya
Abstract
Flexible sensors based on two-dimensional layered materials have gained huge attention in the field of intelligent electronics. The cellulose based platform provides a cost-effective way for fabrication of strain or pressure sensing abilities of the sensor. This paper reports a paper based flexible sensor functionalized by 2D-SnSe2 nanosheets for its multifunctional sensing purposes. 2D-SnSe2 nanosheets were synthesized by a high-yield liquid phase exfoliation technique. The multifunctional sensor fabricated using Whatman filter paper was exploited in the pressure range 2 to 100 kPa. The sensor exhibits the excellent stability and reproducibility with high responsivity of 611% and sensitivity of 1.79 kPa–1. The sensor exhibited excellent stability up to 5000 loading cycles. The response time of the pressure sensors is 100 ms, showing optimum sensor structure for future electronics. The sensor shows excellent potential for the online monitoring of a human breath with 3.2–3.5 s/breath. Finally, the paper advocates the great advancement of two-dimensional transition metal dichalcogenides for their applications as high-performance devices.