Highly sensitive NO2 gas sensors based on hexagonal SnS2 nanoplates operating at room temperature.

Abstract

While continuously developing high-performance chemoresistive gas sensors, reducing device power consumption is also not negligible. One of the most efficient ways is to enable gas sensors to work close to room temperature. In this work, we present a gas sensor based on hexagonal tin disulfide (SnS2) nanoplates for sensitive and reversible NO2sensing at room temperature. Two-dimensional SnS2nanoplates are synthesized via a facile hydrothermal method using Triton X-100 as a surfactant. The sensor exhibits a high response of 15.6 for 50 ppm NO2with an experimental detection of limits of 50 ppb at room temperature. Besides, excellent linearity, outstanding selectivity, and reliable long-term stability within 40 days are also demonstrated during the experiment process. The sensing mechanism of this sensor could be explained as the physisorption and charge transfer between NO2molecules and SnS2nanoplates, which make it possible for the sensor to work at such a low operating temperature. Our research resulted on SnS2nanoplate-based sensor may pave a new way for effective NO2detection in the future.