ZnO负载SnO_2复合材料的制备及其气敏性能  

Preparation and sensing properties of ZnO supporting SnO_2 nanocomposites

作　　者：魏莹[1,2] 仪桂云 王晓冬[1,2] 许亚威[1,2] 周利星[1,2] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000 [2]河南理工大学环境友好型无机材料河南省高校重点实验室培育基地,河南焦作454000

出　　处：《化工进展》2018年第2期651-657,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51404097;61474038;51404097);河南省科技攻关项目(132102210251);河南省高等学校重点科研项目计划(15A430027)

摘　　要：以五水四氯化锡(SnCl4·5H_2O)和乙酸锌[Zn(AC)2·2H_2O]为原料,氢氧化钠(NaOH)为沉淀剂,采用简单的水热法,使二氧化锡(SnO_2)纳米颗粒锚定在蚕蛹状氧化锌(ZnO)表面,一步成功合成了二氧化锡/氧化锌(SnO_2/ZnO)复合材料。采用X射线衍射仪(XRD)、透射电镜(TEM)、高分辨透射电镜(HRTEM)和氮气吸附脱附仪(BET)对材料的结构和形貌进行了表征,研究并讨论了温度、乙醇浓度等因素对SnO_2、ZnO及SnO_2/ZnO复合材料气敏性能的影响。结果表明,所得样品为SnO_2纳米颗粒与蚕蛹状ZnO的复合物,SnO_2纳米颗粒较均匀地负载在ZnO表面。SnO_2/ZnO复合材料气敏元件在最佳工作温度为240℃时,对200μL/L乙醇的灵敏度达到39.68,与SnO_2(24.53)及ZnO(17.8)相比,气敏性能得到了很大的提高。SnO_2/ZnO composites were synthesized by a facile hydrothermal method using Sn Cl4·5 H_2O and Zn（AC）2·2 H_2O as the raw material and NaOH as the precipitant,which makes SnO_2 nanoparticles adhere to the surface of silkworm chrysalis-like ZnO. The structure and morphology of the obtained materials were characterized by XRD,TEM,HRTEM and BET. And the effects of temperature,ethanol concentration and other factors on the sensitivity were inverstigated. The results confirmed that the composite materials were SnO_2 nanoparticles and silkworm chrysalis-like ZnO. The SnO_2 nanoparticles were distributed on the surface of ZnO. The SnO_2/ZnO composite exhibited good gas-sensing properties,and the sensitivity of the sensor to 200μL/L ethanol was 39.68 at the optimum operating temperature（240℃）,which were almost double of that of the individual SnO_2（24.53）and ZnO sensor（17.8）.

关 键 词：二氧化锡/氧化锌 粒子 水热 复合材料 气敏性能 选择性 

分 类 号：TQ17[化学工程—硅酸盐工业]