Near-room-temperature operating ammonia sensors fabricated using hydrothermally in situ synthesized WS2/rGO nanocomposites
Faculty of Physics, Shahrood University of Technology, 3619995161, Shahrood, Iran
Accepted: 26 July 2022
Published online: 7 August 2022
In this investigation, nanocomposites of tungsten disulfide (WS2)/reduced graphene oxide (rGO) were prepared through a facile one-step in situ hydrothermal method at different amounts of rGO. To study the physical properties of the prepared composites, they were subjected to versatile characterization techniques. Raman and X-ray diffraction methods verified the successful reduction of incorporated GO to rGO in WS2/rGO nanocomposites. The polycrystalline hexagonal structure of WS2 was also confirmed by XRD. FESEM images showed that rGO sheets were uniformly distributed in the composite. Images also revealed that rGO sheets prevent particles from agglomerating. Gas sensors were fabricated using WS2 and WS2/rGO nanocomposites and were exposed to different concentrations of ammonia at 45 °C. The sample prepared with 1% GO in WS2 (WRG1%) showed a 1.85 times improvement in gas response at 10 ppm NH3, compared to the pure WS2 sample. The gas response data recorded showed good stability for WRG1% in 5 successive cycles under 10 ppm ammonia. The obtained results showed the impact of rGO on improving the performance of gas sensor devices. In this report, a straightforward method for the synthesis and fabrication of new WS2/rGO-based gas sensor devices has been presented.
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