Perspectives of Defects for Gas Detecting Performance of WSe2 Nano Flakes Selenized from Tungsten Metal Thin Film
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Nitrogen dioxide (NO2) is a toxic gas that poses serious health risks even at low concentrations, necessitating thedevelopment of highly sensitive gas detectors. In this study, WSe2 nano flakes were synthesized by selenizing tungsten thin filmsthrough a simple and economical annealing process. The synthesis conditions were optimized to produce abundant nano flakes withvarious structural defects, including tungsten metal residues, step terraces, and mixed 2H/1T phases. Gas detecting tests demonstratedthat the WSe2 nano flakes exhibit p-type semiconductor behavior. The response was stable and reproducible under repetitive gasexposure cycles. These enhanced defect properties are attributed to the presence of structural defects, which provide additional activesites and improve charge transfer. These perspectives highlight the importance of defect engineering in transition metal dichalcogenides-based gas detectors and provide valuable insights into the development of various high-performance gas detectors usingWSe2 or other transition metal dichalcogenides materials.
Abstract
Nitrogen dioxide (NO2) is a toxic gas that poses serious health risks even at low concentrations, necessitating thedevelopment of highly sensitive gas detectors. In this study, WSe2 nano flakes were synthesized by selenizing tungsten thin filmsthrough a simple and economical annealing process. The synthesis conditions were optimized to produce abundant nano flakes withvarious structural defects, including tungsten metal residues, step terraces, and mixed 2H/1T phases. Gas detecting tests demonstratedthat the WSe2 nano flakes exhibit p-type semiconductor behavior. The response was stable and reproducible under repetitive gasexposure cycles. These enhanced defect properties are attributed to the presence of structural defects, which provide additional activesites and improve charge transfer. These perspectives highlight the importance of defect engineering in transition metal dichalcogenides-based gas detectors and provide valuable insights into the development of various high-performance gas detectors usingWSe2 or other transition metal dichalcogenides materials.