基于ZnO中空纳米纤维的甲醛气体传感器研究

Research on formaldehyde gas sensor based on ZnO hollow nanofibers

以静电纺聚乙烯吡咯烷酮(PVP)纳米纤维为牺牲性模板,利用原子层沉积结合高温煅烧工艺制备ZnO中空纳米纤维,并以此为敏感材料构建了甲醛气体传感器.传感器的最佳工作温度为200℃,对体积分数为5×10^(-5)甲醛气体的灵敏度最高可以达到73.通过对比研究得知,传感器的灵敏度与ZnO中空纳米纤维的表面耗尽层空间占比正相关. ZnO中空纳米纤维独特的中空结构和较小的壳层厚度,增大了表面电子耗尽层在纤维中的空间占比,从而提高了传感器的灵敏度.

Using electrostatic spinning polyvinylpyrrolidone(PVP)nanofibers as the sacrificial template,ZnO hollow nanofibers were prepared by atomic layer deposition combined with high temperature calcination.Formaldehyde gas sensor was constructed based on the ZnO hollow nanofibers.The optimal operating temperature of the sensor was 200℃and the response of the sensor to 5×10^(-5) of formaldehyde could be up to 73.The comparison showed that the response of the sensor was positively correlated with the space proportion of the surface depletion layer of ZnO hollow nanofibers.The hollow structure as well as the reduction of shell thickness of ZnO hollow nanofibers increased the space proportion of the surface depletion layer in the nanofibers,which consequently improved the response of the sensor.