Ultrasensitive room temperature NO2 sensors based on liquid phase exfoliated WSe2 nanosheets

By Rensong Guo, Yutong Han, Chen Su, Xinwei Chen, Min Zeng, Nantao Hu, Yanjie Su, Zhihua Zhou, Hao Wei, Zhi Yang. 2019

144 citations recorded by the source corpus.

Abstract Semiconducting two-dimensional (2D) transition metal dichalcogenides (TMDs) are promising gas-sensing materials due to their large surface-to-volume ratio, layered structures, susceptible surfaces, and excellent conductivities. Herein, a simple and effective method has been developed to exfoliate tungsten diselenide (WSe2) into few-layered nanosheets with N-methyl-2-pyrrolidone (NMP) as a dispersant. The gas sensor based on the as-synthesized WSe2 nanosheets shows an extremely high response (50 ppb, 5.06) under a low detection concentration of nitrogen dioxide (NO2) at room temperature (25 °C), which is much higher than many other reports for 2D TMDs-based gas sensors. Additionally, our sensor also exhibits a response of 11.01 to 10 ppm NO2, an excellent selectivity, and a reliable long-term stability within 8 weeks. It is expected that the outstanding performances of the gas sensors based on WSe2 nanosheets reported in the present work will make WSe2 a promising candidate for ultrasensitive NO2 sensing applications.

Subfields: Electrical and Electronic Engineering, Materials Chemistry, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/380992e271ef536c5b7bd1b9c748c89fd49578ed