Room Temperature Detection of Ppb Level NO2 by $\text{WS}_{2}$ Sensors

In this work, we report synthesis of tungsten disulfide (WS2) platelets from sulfurization of commercial tungsten trioxide powder
$(\text{WO}_{3})$
using hydrogen free atmospheric pressure chemical vapor deposition (APCVD) technique. This methodology has the potential to be scaled up to industrial scale owing to its high yield, reproducibility, low cost, and ease of operation. Composition and morphological investigations revealed the total conversion of the metal oxide powder to metal dichalcogenide nanosheets. Gas sensing results showed the potential of the obtained material in detecting NO
2
at room temperature. The responses were remarkable, stable and reproducible towards 100 ppb of nitrogen dioxide (NO
2
).