Abstract:Highly dispersed SnO2 nanoparticels were synthesized at ambient conditions based on carbon microspheres, and the gas sensing properties of the material were studied systematically. The conductance responses of the material were measured by exposing it to ethanol gas (C2H5OH). It was found that the sensor exhibited better sensing responses to ethanol gas than the commercial SnO2 at the working temperature of 330 ℃. Furthermore, the gas sensor responses increased linearly with the increment of the gas concentrations of ethanol in the range from 5×106 to 200×106.

Abstract:Flower-like ZnO was synthesized in a simple chemical bath method. This ZnO structure modified by a controllable density of Au nanoparticles with an average diameter of 40 nm was achieved with hydrothermal process. The Uv-vis adsorption spectra of Au nanoparticles shifted a little, indicating the interaction between ZnO and Au nanoparticles, which led to excellent gas sensing performance. ZnO modified by Au nanoparticles with weight percent of 6 % showed that the optimum gas response to acetone and the gas response was nearly 17 times higher than that of pure ZnO.