摘要
研究了以锌粉为原料,活性炭为催化剂,高温气相氧化反应制备花状、四针状和无定形氧化锌的合成条件及形貌。X射线衍射结果表明该晶体属六方晶系纤锌矿结构。扫描电镜研究结果表明活性炭催化剂用量、反应温度对产物氧化锌晶须的形态影响很大,对所有样品的气敏元件在浓度范围为5×10-6～2×10-4的甲醇、乙醇、丙酮和正丙醇气体中进行了气敏性能测试,表明该类元件属于金属氧化物半导体气敏元件,所有气敏元件在相同工作电压下对正丙醇气体的灵敏度大于对其它3种气体的灵敏度,并且所有气敏测试都具有很短的响应时间,所有气敏元件具有较好的气敏性能。
Abstract. This paper dealt with the preparing conditions and morphology of flower-like, tetrapod-like and amor- phous zinc oxide whiskers, which were prepared by oxidation of zinc metal in the air and by introducing active carbon as a reaction catalyst. The product was pure zinc oxide verified by XRD patterns of ZnO whisker, in which the peaks are sharp with narrow half-widths and can be identified as a wurtzite ZnO structure. Morpholo- gy of ZnO whiskers was affected greatly by carbon black usage and the reaction temperature. The possible growth mechanisms on the ZnO nano-whiskers were proposed in this paper. The gas sensing propertie＇ of the ZnO layers were tested with CHaOH, C2 H5OH, CHaCOCH3 and n-Ca H7 OH, respectively. The ZnO sensors show typical n-type metal oxide semiconductor behavior, the resistance decreases as the gases are increased. The sensors has a higher sensitivity to n-Ca H7 OH than the sensitivity to other gases. The zinc oxide sensor has high- er gas response values and a fast response.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第B06期484-487,491,共5页
Journal of Functional Materials
基金
陕西省教育厅专项科研计划资助项目(09JK823)
关键词
无机非金属材料
氧化锌
燃烧合成法
气敏性能
non-metallic inorganic material
zinc oxide
combustion
gas sensitivity
