P2GS.4 - WS2-decorated rGO for Quasi-room Temperature Gas Sensing Applications
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-2 - Gas Sensors
- V. Paoluccia, S. Emamjomeha, C. Cantalinia - Department of Industrial and Information Engineering and Economics, University of L´Aquila, L´Aquila (Italy), L. Ottavianob - Department of Physical and Chemical Sciences, University of L’Aquila, L’Aquila (Italy)
- 777 - 778
We report on the NO2 and humidity chemoresistive gas responses of reduced graphene oxide (rGO) and WS2-decorated rGO (GO/WS2). Films are prepared by drop casting a solution of GO and WS2 suspended nanoflakes in ethanol, on Si3N4 patterned substrates to yield a homogeneous dispersion of WS2 on the GO matrix as shown by HRTEM microstructural characterization. After thermal reduction at 70°C, rGO and rGO/WS2 gas sensing response are compared, exposing the films to NO2 (2-10 ppm) in dry air and 60% Relative Humidity (R.H.) at quasi room temperature (i.e. 25°C and 50°C). WS2 addition improves the stability of the baseline, and poses improved sensitivity to NO2. Finally, the effect of visible light illumination on gas desorption mechanism is examined, observing a positive effect on the base line recovery after gas evacuation.