LPG sensing properties of SnO2 nanoparticles doped with several metal oxides by a hydrothermal method

Xuan Hien Vu, Tu Huy Anh Ly, Quang Trung Khuc, Duc Vuong Dang and Duc Chien Nguyen

Abstract

CuO, Al₂O₃, Ag₂O and La₂O₃ doped on SnO₂ nanoparticles were successfully fabricated by a hydrothermal route at 200 °C for 3 h. The morphology and composition were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and energy dispersive x-ray analysis (EDX). The results showed that the particle size is 6–8 nm without other impurities. The influence of CuO with a concentration of 0.5–3wt%, which was doped on sol SnO₂ 5wt% by hydrothermal and vibration technique, was discussed. In addition, the gas sensitivity experiment of samples to 1% LPG in the temperature range of 230–430 °C indicated the improvement in sensitivity and response time. In particular, the SnO₂ sol suspension 5wt% doped with CuO 2wt% showed the best sensitivity at 330 °C