退火温度对纳米氧化铜湿敏性能的影响  

Influences of annealing temperature on humidity sensing properties of nanostructured CuO

作　　者：邬春秀 刘冬梅 崔玉亭[1] 张丁可[1] WU Chun-Xiu;LIU Dong-Mei;CUI Yu-Ting;ZHANG Ding-Ke(School of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China)

机构地区：[1]重庆师范大学物理与电子工程学院

出　　处：《原子与分子物理学报》2019年第4期581-587,共7页Journal of Atomic and Molecular Physics

基　　金：重庆高校创新团队建设计划(CXTDX201601016)

摘　　要：湿度传感器在生产和生活中扮演着不容小觑的角色,越来越受到人们的广泛关注.本文利用低温液相法以氢氧化钠、过硫酸铵和铜粉为原料,成功制备出氧化铜纳米结构.运用扫描电子显微镜(SEM)、X-射线衍射仪(XRD)等技术对材料的结构与形貌进行表征,发现可以通过退火温度来调控氧化铜纳米结构的表面形貌,进一步比较研究了不同退火温度下制备的纳米氧化铜的湿敏性能.并将CuO纳米材料涂敷在电极表面制成了湿敏元件.研究结果表明,元件的湿敏特性明显与材料的退火温度密切相关,在500℃退火获得的氧化铜纳米线灵敏度最高,达到1.93×10~5;湿滞最小,几乎为零;感湿频率特性曲线的线性度好.分析认为这主要是由于,退火温度500℃时,氧化铜呈现纳米线状结构,具有更大的表面积,增加了与水分子的接触面积,进而具有更佳的湿敏特性.Humidity sensor plays an important role in production and life.It has attracted more and more attention.In this paper,nanostructured cupric oxide(CuO)was synthesized by a low temperature liquid method with sodium hydroxide,ammonium persulfate and copper powder as raw materials.In preparation,annealing temperatures were varied to obtain different CuO nanostructures.Its phase composition and microstructure resistance-temperature properties were characterized and studied by using the X-ray diffraction(XRD)and scanning electron microscope(SEM)instruments.It showed that CuO nanowires were obtained with the annealing temperature at 500℃.And the influences of annealing temperature on the humidity sensing properties of nanostructured CuO were also discussed.The results show that with the increasing of annealing temperature,the sensitivity value of nanostructured CuO increased first and then decreased.At the annealing temperature of 500℃,the nanostructured CuO has the highest sensitivity(1.93×10~5),the minimum moisture hysteresis and the better linearity of the humidity sensing properties.We owe this good humidity sensing properties to their one-dimensional nanowires structures leading to large surface-to-volume ratio.

关 键 词：氧化铜 退火温度 湿敏特性 纳米结构 

分 类 号：O65[理学—分析化学]