Application of TiO_2/SnO_2 nanoparticles in photoluminescence based fast ammonia gas sensing

摘要

In the present research work we reported the highly dispersible TiO_2/SnO_2 nanoparticles produced via a simple aqueous solution growth technique with ~50 nm average grain size. The surface morphology of the material have been studied by using scanning electron (SEM) and atomic force microscopes (AFM). Using photoluminescence, interaction between ammonia gas and TiO_2/SnO_2 (60:40 composition) nanoparticles were investigated. The material shows average significant increment in the PL intensity with no shifting in peak, which conform its tremendous applicability in optical gas sensor to detect ammonia gas (20 ppm) using photoluminescence technique. The gas sensing was systematically performed through photoluminescence spectrometer for different concentration of ammonia at room temperature. The response and recovery time of these samples are found to be in the range of 12 and 50 s respectively.