物理化学学报 >> 2012, Vol. 28 >> Issue (06): 1539-1544.doi: 10.3866/PKU.WHXB201204101

材料物理化学 上一篇    下一篇

In2O3/CdO复合材料的制备及气敏特性

陈鹏鹏1, 王兢1, 姚朋军1,2, 杜海英1,3, 李晓干1   

  1. 1. 大连理工大学电子科学与技术学院, 大连 116023;
    2. 沈阳师范大学教育技术学院, 沈阳 110000;
    3. 大连民族学院机电信息工程学院, 大连 116600
  • 收稿日期:2012-02-01 修回日期:2012-04-09 发布日期:2012-05-17
  • 通讯作者: 王兢 E-mail:wangjing@dlut.edu.cn
  • 基金资助:

    国家自然科学基金(61176068, 61131004, 61001054)资助项目

Synthesis and Gas Sensitivity of In2O3/CdO Composite

CHEN Peng-Peng1, WANG Jing1, YAO Peng-Jun1,2, DU Hai-Ying1,3, LI Xiao-Gan1   

  1. 1. School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, Liaoning Province, P. R. China;
    2. School of Educational Technology, Shenyang Normal University, Shenyang 110000, P. R. China;
    3. Department of Electromechanical Engineering & Information, Dalian Nationalities University, Dalian 116600, Liaoning Province, P. R. China
  • Received:2012-02-01 Revised:2012-04-09 Published:2012-05-17
  • Contact: Wang Jing E-mail:wangjing@dlut.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (61176068, 61131004, 61001054).

摘要: 采用水热合成方法制备了花状In2O3纳米材料. 利用X射线衍射(XRD)、扫描电镜(SEM)、能量色散X射线光谱(EDX)及透射电镜(TEM)对材料的结晶学特性及微结构进行了表征. 制备的In2O3材料呈现花状, 是由粒径约20 nm的椭球状小颗粒构成的分级结构材料. 将制备的In2O3与纳米CdO以摩尔比1:1 混合后, 发现制成的In2O3/CdO复合材料经热处理后呈现葡萄状多孔结构. 测试In2O3/CdO复合材料制作的气敏元件处于最佳工作温度(410 °C)时, 对0.05×10-6 (体积分数, φ)的甲醛气体表现出较高的灵敏度. 对比测试发现, In2O3/CdO 复合材料制作的气敏元件对不同浓度甲醛的灵敏度明显优于纯花状In2O3纳米材料. 同时In2O3/CdO复合材料制作的气敏元件在乙醇、甲苯、丙酮、甲醇以及氨气等干扰气体中具有对甲醛良好的选择性. 讨论了In2O3/CdO复合材料气敏元件的敏感机理.

关键词: 复合材料, 气敏元件, 甲醛气体, 纳米材料, 多孔结构

Abstract: Indium oxide (In2O3) was synthesized using a hydrothermal process. The crystallography and microstructure of the synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The In2O3 had a flower-like hierarchical nanostructure and was composed of tiny near-spherical crystals with a diameter of approximately 20 nm. When In2O3 was mixed with CdO in a 1:1 molar ratio, it was found that the resulting In2O3/CdO composite showed an interesting grape-like porous microstructure following calcinations at elevated temperatures. A gas sensor using this In2O3/CdO composite as the sensing material showed higher sensitivity to different concentration of formaldehyde than the gas sensor based on pure flower-like In2O3 nanomaterials. The In2O3/CdO-based sensors showed a high sensitivity to a concentration of 0.05×10-6 formaldehyde at the optimized operating temperature of 410 °C and a good level of selectivity over other possible interference gases such as ethanol, toluene, acetone, methanol, and ammonia. The gas sensing mechanism of In2O3/CdO sensor has been discussed in detail.

Key words: Composite material, Gas sensor, Formaldehyde vapor, Nano-materials, Porous microstructure

MSC2000: 

  • O649.4