Morphology, Characterization, and Gas Sensor Properties of Sr Doped WO3 Thin Film Nanostructures

A set of novel nanostructures (NS) of Sr (5 wt. %, 10 wt. %, 15 wt. % and 25 wt. %) doped WO3 (STO) are synthesized by co-precipitation method and coated on glass substrate as a thin film using electron beam deposition. NS are characterized by UV-Visible, scanning electron microscopic method (SEM), atomic force microscopy (AFM), cyclic voltammetry (CV), x-ray diffractometer (XRD) and photoluminescence spectroscopic (PL) analytical techniques. Gas sensitivity of the NS reveals that the 25 wt. % of Sr doped WO3 NS exhibits better sensitivity and selectivity towards 100 ppm concentration of chloroform with better response and recovery time exhibited in presence of other volatile gases and obtained values show comparatively fast selectivity (18 s/14 s at 200 degrees C). Enhanced selectivity, quick response time and stability towards other volatile gases are tested for 25 wt. % Sr doped WO3 NS. The Sr doped WO3 is able to deliver its role in the biomedical, food industries as a promising candidate for chloroform detection and other related applications.