Speaker
Description
In this work, Na-doped $WO_3$ nanorods were successfully synthesized by a precipitation method and significantly evaluated for gas-sensing detection. The as–prepared nanoparticles and their fabricated sensing films were structurally characterized by X-ray analysis, nitrogen adsorption, and electron microscopy. The results confirmed that the p-type Na-doped $WO_3$ nanorods were highly crystalline with a monoclinic phase of $WO_3$. The sensing films were prepared by spin coating technique and their gas-sensing performances were studied toward various gas concentrations at the working temperatures ranging from 200-350°C in dry air. It was found that the gas-sensing properties of the WO3 sensing film selectively exhibited the highest response of ∼250 to 3 vol% acetylene at the working temperature of 250°C. Moreover, the optimal sensor displayed high acetylene selectivity against $C_2H_5OH$, $C_3H_6O$, $H_2$, $CH_4$, $NO_2$, HCHO and $CH_3OH$. Therefore, the p-type Na-doped $WO_3$ sensor is highly potential for sensitive and selective acetylene detection and may be useful for general industrial applications.
Keywords : p-type Na/$WO_3$, Nanorods, Precipitation, Acetylene, Sensor.
