【作者】 张乐喜； 李玲； 祁晴晴； 别利剑；

【Author】 Lexi Zhang;Ling Li;Qingqing Qi;Lijian Bie;School of Materials Science and Engineering,Tianjin University of Technology;

【机构】 天津理工大学材料科学与工程学院；

【摘要】 ZnO纳米片由于比表面积、特定晶面、二维电子传导等方面的特点在气体传感器领域广受关注[1]。目前合成的ZnO纳米片主要是单晶结构[2],而多晶结构增加了结构缺陷,可以作为氧气和目标气体的吸附和活化中心,有利于提高气敏性能。因此,基于简便方法合成多晶介孔ZnO纳米片,进而研究其表面缺陷增强的气敏性能,具有重要的理论和现实意义。本文通过简便的水热方法,结合后续热处理,成功得到了介孔ZnO纳米片。选区电子衍射表明纳米片是多晶结构,而荧光光谱和X-射线光电子能谱证实产物表面含有较多缺陷和吸附氧。基于此材料的气敏器件对低浓度甲醛表现了优异的气敏性能。较高的灵敏度和对乙醇的良好选择性可能归因于纳米片特殊的微结构和表面缺陷。更多还原

【Abstract】 ZnO nanosheets are promising gas-sensing materials,due to their feature in surface area,lattice plane,2D electron transfer.Till now,most of the reported ZnO nanosheets are single-crystal.As the adsorption and activation centers,the increased structural defects in polycrystal nanosheets can improve their gas-sensing performance.So,it has important theoretical and practical significance to synthesize polycrystal mesoporous ZnO nanosheets and then focus on their defect-enhanced gas-sensing performance.Here,ZnO nanosheets were synthesized using hydrothermal method with subsequent calcinations.Selected area electron diffraction(SAED) patterns proved the polycrystal structure of the nanosheets.Photoluminescence analysis and X-ray photoelectron spectroscopy(XPS) confirmed that abundant intrinsic defects and oxygen species are present on the ZnO crystal surfaces.Excellent formaldehyde-sensing performance based on as-obtained sample is considered to be mainly originated from the special microstructure and plenteous defects.更多还原