2D-SnSe₂ Nanosheet Functionalized Piezo-resistive Flexible Sensor for Pressure and Human Breath Monitoring

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.

Metal oxide‐based gas sensors for the detection of exhaled breath markers

“…Reduced graphene oxide, as a two‐dimensional nanostructure, with excellent surface‐to‐volume ratio, low toxicity and outstanding electron mobility (200,000 cm 2 V −1 S −1 ), has been widely utilized for disease monitoring (Feng et al, 2017; Lee et al, 2018; Vajhadin et al, 2020; Zhang et al, 2018). In addition to graphene, other two‐dimensional materials such as 2D‐SnSe 2 and Ti 3 C 2 MXene have employed for producing flexible MGS owing to lightweight, outstanding flexibility and low cost (Sun et al, 2020; Tannarana et al, 2020). Recently, Lee et al reviewed carbon‐based materials such as graphene oxide as a sensing substrate for the detection of NO 2 gas (Lee et al, 2018).…”

An Overview of Wearable Piezoresistive and Inertial Sensors for Respiration Rate Monitoring

“…In [95], M. Tannarana et al developed novel low-cost, flexible, and wearable pressure sensors based on 2D-SnSe2 nanosheets, obtained by a high-yield liquid phase exfoliation technique, deposited on a paper substrate. In particular, SnSe 2 is an n-type semiconductor with a mobility of 85 cm 2 /(V s), high chemical and environmental stability.…”

“…Furthermore, the smart textiles in [55,68,69] employ simple and scalable manufacturing processes, which doesn't require expensive machinery or high temperatures but are essentially based on liquid solution deposition, opening new frontiers for the next generation of wearable devices. Finally, the sensing material in [95] has the advantage of using inexpensive substrate and active material but guarantees good sensitivity (1.79 kPa −1 ) and stability.…”

Recent progress in optoelectronic applications of hybrid 2D/3D silicon-based heterostructures

“…However, the large family of low-dimensional materials can be explored for developing more heterostructure photodetection devices. For example, other low-dimensional TMDCs such as TiX 2 , CoX 2 , NiX 2 , SnX 2 , NbX 2 , TaX 2 (X = S, Se, Te) [103][104][105][106][107][108], can be explored for developing new high-performance photodetectors. TMDCs are also advancing as multifunctional materials for future wearable electronic and optoelectronic devices as an inexpensive alternative to the costly manufactured semiconducting materials currently employed in the electronics industry.…”