Fabrication and Characterization of Directly Synthesized WSe2 Nano-flowers for NO2 Sensing

Abstract

In this article, we report fabrication and characterization of tungsten diselenide (WSe2) nano-flowers for Nitrogen Dioxide (NO2) gas sensing. In this process, Tungsten diselenide (WSe2) nano-flowers were directly synthesized using solvothermal route on FTO coated glass substrate. The nanoflower structure of the directly synthesized film is depicted in FESEM image. The synthesized sample was characterized for its crystallinity and phase purity through X-ray Diffraction (XRD). Energy Dispersive X-ray (EDX) determined its elemental composition, and Field Emission-Scanning Electron Microscopy (FE-SEM) clearly confirmed its nanostructure and surface morphology. These directly synthesized WSe2 nanoflower structures are responsible for enhanced NO2 gas sensing. The fabricated device has shown 45.12% sensing response with 2 ppm gas exposure at -1 V bias (at 120 °C). The selectivity of the fabricated device has also been analyzed with ammonia, acetone, methanol and ethanol. © 2024 IEEE.