Optical and ammonia-sensing properties of SnO<inf>2</inf>nanoparticles synthesized using a 900W microwave

Abstract

© 2016 The Japan Society of Applied Physics. SnO2nanoparticles were successfully synthesized using a 900W microwave for 10, 20, and 30min. Tetragonal SnO2nanoparticles composed of Sn and O were detected by X-ray diffraction (XRD), selected area electron diffraction (SEAD), scanning electron microscopy (SEM), energydispersive X-ray (EDX) spectroscopy, and transmission electron microscopy (TEM). The SnO2nanoparticles processed for 30 min were the best crystals. The 3.5 eV energy gap and 395nm emission wavelength were determined by UV-visible absorption and photoluminescence (PL) spectroscopy. The gas-sensing performance of SnO2nanoparticles during exposure to an NH3-air mixture was studied at different working temperatures and NH3concentrations. At 1055 ppm NH3and 350 °C, the SnO2nanoparticles showed a sensitivity of 9.2 with the response and recovery times of 9 and 37 s, respectively.