Preparation,Doping and Acetone Sensing Performance of LaCoO3 Nanoparticles
In order to develop new perovskite cobalt oxide gas sensitive materials,investigate the effects of different doping ions and doping con-centrations on the gas sensitive performance of LaCoO3,perovskite-type LaCoO3 and A-site-doped LaCoO3 with Ca2+and Sr2+nano-particles were pre-pared by sol-gel method using La(NO3)3·6H2O,Co(NO3)3·6H2O,acrylamide,and citric acid as main raw materials.The crystal structure,morphology,and semiconductor property of the samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and infrared spectroscopy(IR).The effects of doping amounts on the grain size and activation energy of LaCoO3 nanoparticles were studied.The results show that doping with Ca2+and Sr2+at A sites can increase the grain growth activation energy of LaCoO3 and inhibit grain growth.The gas sensing test results indicate that doping with Ca2+and Sr2+can enhance the response ability of LaCoO3 to acetone,especially when the doping level of Ca2+is 15%,the sensitivity of the sample to 2%volume concentration of acetone can reach 97.83%.
NETL
NSTL
万方数据
