SnS 2 Nanograins on Porous SiO 2 Nanorods Template for Highly Sensitive NO 2 Sensor at Room Temperature with Excellent Recovery

Abstract

In order to develop high performance chemoresistive gas sensors for Internet of Everything applications, low power consumption should be achieved due to the limited battery capacity of portable devices. One of the most efficient ways to reduce power consumption is to lower the operating temperature to room temperature. Herein, we report superior gas sensing properties of SnS 2 nanograins on SiO 2 nanorods toward NO 2 at room temperature. The gas response is as high as 701% for 10 ppm of NO 2 with excellent recovery characteristics and the theoretical detection limit is evaluated to be 408.9 ppb at room temperature, which has not been reported for SnS 2 -based gas sensors to the best of our knowledge. The SnS 2 nanograins on the template used in this study have excessive sulfur component (Sn:S = 1:2.33) and exhibit p-type conduction behavior. These results will provide a new perspective of nanostructured two-dimensional materials for gas sensor applications on demand. © Copyright 2019 American Chemical Society.