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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

ZnO-Bi2O3混合氧化物厚膜的结构和气敏性能

祝柏林1; 谢长生2; 曾大文2; 王爱华2; 宋武林2   

  1. 1. 武汉大学物理科学与技术学院, 武汉 430072; 2. 华中科技大学材料学院, 武汉 430074
  • 收稿日期:2004-05-13 修回日期:2004-07-19 出版日期:2005-05-20 网络出版日期:2005-05-20

Structure and Gas-sensitive Properties of ZnO-Bi2O3 Mixed Thick Films

ZHU Bai-Lin1; XIE Chang-Sheng2; ZENG Da-Wen2; WANG Ai-Hua2; SONG Wu-Lin2   

  1. 1. Department of Physics; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=Wuhan+University','knet','status=yes,scrollbars=yes,width=375,height=250')">Wuhan University; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=Wuhan+430072','knet','status=yes,scrollbars=yes,width=375,height=250')">Wuhan 430072; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=China','knet','status=yes,scrollbars=yes,width=375,height=250')">China; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=Department+of+Materials+Science+and+Engineering','knet','status=yes,scrollbars=yes,width=375,height=250')">2.Department of Materials Science and Engineering; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=Huazhong+University+of+Science+and+Technology','knet','status=yes,scrollbars=yes,width=375,height=250')">Huazhong University of Science and Technology; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=Wuhan+430074','knet','status=yes,scrollbars=yes,width=375,height=250')">Wuhan 430074; onclick="TPI_openwindow('/GRID20/knowledgenet.aspx?sdb=CJFD&sfield=%e8%8b%b1%e6%96%87%e4%bd%9c%e8%80%85&skey=China%ef%bc%89','knet','status=yes,scrollbars=yes,width=375,height=250')">China
  • Received:2004-05-13 Revised:2004-07-19 Published:2005-05-20 Online:2005-05-20

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摘要： 采用金属蒸气氧化的方法制备了针状ZnO和椭球形Bi2O3纳米颗粒作为气敏厚膜的原材料,其中得到的Bi2O3为δ相和β相的混合物.通过XRD和SEM分析了ZnO、Bi2O3 以及ZnO-Bi2O3混合物厚膜的物相和表面形貌,并测试了厚膜的电导和气敏性能.结果发现纯Bi2O3对乙醇和丙酮蒸气有一定的气敏性能,表现为P型导电;与纯ZnO相比,ZnO-Bi2O3 混合物厚膜对苯、甲苯和二甲苯的敏感度降低,这与厚膜晶粒尺寸增大、其晶界势垒高度增大有关,然而Bi2O3可能作为一种弱的催化剂提高了厚膜对乙醇和丙酮的敏感性能.

关键词: ZnO, Bi2O3, 纳米颗粒, 电导, 气敏

Abstract: Needle-shaped ZnO and ellipsoid-shaped Bi2O3 nanoparticles, as raw materials of thick films, were prepared by metallic vapour oxidation, and the obtained Bi2O3 is a mixture of δ and β phases.
The phase structure and surface morphology of the thick films based on ZnO, Bi2O3 and ZnO-Bi2O3 mixture were investigated by XRD and SEM, then the resistance and gas sensitivity of the thick films
were measured. The results indicate that Bi2O3 films show P-type conductivity and have sensitivity to alcohol and acetone more or less. Compared with ZnO, the sensitivity of ZnO-Bi2O3 to benzene,
toluene and xylene is lower, which is relative with the increase of granular sizes and barrier height located at grain boundaries of the thick films. But Bi2O3, maybe as a very low activity catalyst,
improves the gas sensitivity of the thick films to alcohol and acetone.

Key words: ZnO, Bi2O3, nanoparticles, conductivity, gas-sensitivity

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