基于钼掺杂氧化锌微米花的高灵敏和快响应丙酮气体传感器研究

High Sensitivity and Fast Response Acetone Gas Sensor Based on Molybdenum Doped Zinc Oxide Micron Flower

丙酮是一种无色高挥发性的有毒溶剂,易致毒,严重威胁人类生命健康,因此研究灵敏度高和响应迅速丙酮传感器具有重要的现实意义。通过沉淀法和煅烧法制备了纯相和不同钼(Mo)掺杂浓度的氧化锌(ZnO)微米花结构,并将Mo-ZnO作为敏感材料制作成丙酮气体传感器。气敏结果显示,Mo掺杂的ZnO对丙酮气体的检测性能较纯ZnO大幅提升,尤其Mo_(3)-ZnO气体传感器在225℃对100×10^(-6)丙酮气体的响应为纯ZnO的3倍,并且具有快速的响应恢复时间(5 s/5 s)以及良好的线性度和低的检测下限。这些优异的传感性能归因于Mo-ZnO微米花结构由许多带有小孔的纳米薄片组成,其中开放的3D空间提供了更大的比表面积,可以吸附更多的气体分子并产生高响应。

Acetone is a colorless and highly volatile toxic solvent,which is easy to cause poisoning,and it is a serious threat to human life and health,so the study of high sensitivity and rapid response acetone sensor has important practical significance.Pure zinc oxide(ZnO)micron flower structures with different molybdenum(Mo)doping concentrations are prepared by precipitation and calcination methods.Mo-ZnO is used as sensitive material to fabricate acetone gas sensors.The gas sensing results show that the detection performance of Mo-doped ZnO for acetone gas is significantly improved compared with pure ZnO.In particular,the response of Mo_(3)-ZnO gas sensor to 100×10^(-6) acetone gas at 225℃ is 3 times that of pure ZnO,and it has a fast response recovery time(5 s/5 s),good linearity and low detection limit.These excellent sensing properties come from the fact that the Mo-ZnO nanoparticle microflower structure consists of many nanosheets with small holes,where the open 3D space provides a larger specific surface area that can adsorb more gas molecules and produce a high response.