WO_3掺杂NiO纳米材料的VOCs气敏性能

VOCs gas sensing properties of the NiO nanometer powders doped with WO_3

制备掺杂WO_3的NiO纳米粉体材料并测量了材料的VOCs气敏性能。XRD分析表明,WO_3掺杂使NiO粉体中出现新相NiWO_4。随着WO_3掺杂量增多,NiO的衍射峰半高宽明显宽化,WO_3掺杂抑制了热处理过程中NiO晶粒的长大。50×10^(-6)浓度二甲苯、甲醛、甲苯和乙醇等气体中的测量结果说明,WO_3掺杂明显提高了NiO材料的VOCs气体灵敏度,对二甲苯的最佳掺杂量是5%,最大灵敏度为26.4,响应时间4s;对甲醛的最佳掺杂量是10%,最大灵敏度是4.67,响应时间6s。

This paper introduces the main preparation of WO_3 doped NiO nanometer powders and its VOCs gas - sensing properties.The XRD analysis shows that a new phase - - NiWO_4 exists in WO_3 doped NiO .With the doping concentration increasing,the diffraction peak half-width of NiO increases markedly. It suggests the doped WO_3 impedes the growth of NiO grain during the heat treatment.Testing with xylene, formaldehyde,toluene and ethanol（which concentration are all 50×10^（-6））,indicates that the gas sensitivity of NiO is improved evidently by doping WO_3.When the doping amount is 5%,the maximum sensitivity to xylene is 26.4,the response time is 4s;when the doping amount is 10%,the maximum sensitivity to formaldehyde is 4.67,the response time is 6s.