ZIF-8衍生La掺杂ZnO纳米颗粒的制备及其气敏性能

以ZIF-8及La掺杂ZIF-8为前驱体,经高温煅烧制备ZnO及La掺杂ZnO纳米颗粒。研究了La掺杂对ZnO纳米颗粒的形貌、晶体结构及气敏性能的影响。利用X射线衍射仪、扫描电子显微镜对材料的微结构进行表征,结果表明:La掺杂有利于获得更小粒径的类球形纳米结构,但La掺杂未改变ZIF-8及衍生ZnO纳米结构的晶体结构。以丙酮为目标气体研究了La掺杂对ZnO纳米颗粒气敏性能的影响,研究发现La掺杂能够显著提高ZnO纳米颗粒对丙酮的灵敏度、选择性和响应速度。La的掺杂量为3 at%时ZnO纳米颗粒对丙酮的气敏性能最佳,且在350℃工作温度下对丙酮具有良好的气敏稳定性和灵敏度-丙酮浓度线性关系。

Synthesis and Sensing Properties of ZIF-8 Derived La-doped ZnO Nanoparticles

ZnO and La-doped ZnO nanoparticles were prepared by high temperature calcination using ZIF-8 and La-doped ZIF-8 as precursors.The effects of La doping on morphology,crystal structure and acetone sensing properties of ZnO nanoparticles were studied.The results show that La doping is beneficial to obtain spherical nanostructures with smaller size,but the crystal structures of ZIF-8 and ZnO nanostructures are not changed.The acetone sensing properties of the sensors based on ZnO nanoparticles with different La doping contents were investigated.It is found that La doping can significantly improve the sensitivity,selectivity and response rate of ZnO nanoparticles to acetone.When the La doping content is 3 at%,the ZnO nanoparticles exhibit the best acetone sensing properties.Moreover,the acetone sensing properties of 3 at% La-doped ZnO nanoparticles have excellent stability and the linear relation of sensitivity-acetone concentration at 350℃.