Synthesis and Gas Sensitivity of In 2 O 3 /CdO Composite
Synthesis and Gas Sensitivity of In 2 O 3 /CdO Composite
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DOI：
10.3866/pku.whxb201204101
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发表时间：
2012-05
影响因子：
10.9
通讯作者：
Cheng Peng-peng;大连 大连理工大学电子科学与技术学院;Wang Jing;Yao Peng-jun;Du Hai-Ying;Li Xiao-gan;沈阳 沈阳师范大学教育技术学院-沈阳-沈阳师范大学教育
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文献类型：
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作者：
Cheng Peng-peng;大连 大连理工大学电子科学与技术学院;Wang Jing;Yao Peng-jun;Du Hai-Ying;Li Xiao-gan;沈阳 沈阳师范大学教育技术学院-沈阳-沈阳师范大学教育
采用水热法合成了氧化铟（In 2 O3）.采用X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线能谱（EDX）和透射电子显微镜（TEM）对样品的晶体结构和微观结构进行了表征。In 2 O3具有花状分级纳米结构，由直径约20 nm的微小近球形晶体组成。当In 2 O3与CdO以1：1的摩尔比混合时，发现所得In 2 O3/CdO复合材料在高温煅烧后显示出有趣的葡萄状多孔结构。以该In 2 O3/CdO复合材料为敏感材料的气敏元件对不同浓度甲醛的敏感性均高于以纯花状In 2 O3纳米材料为敏感材料的气敏元件。在410 °C的最佳工作温度下，In 2 O3/CdO基传感器对0.05×10 - 6的甲醛具有很高的灵敏度，对乙醇、甲苯、丙酮、甲醇和氨气等干扰气体具有很好的选择性.对In 2 O3/CdO气敏元件的气敏机理进行了详细的讨论.
: Indium oxide (In 2 O 3 ) 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 In 2 O 3 had a flower-like hierarchical nanostructure and was composed of tiny near-spherical crystals with a diameter of approximately 20 nm. When In 2 O 3 was mixed with CdO in a 1:1 molar ratio, it was found that the resulting In 2 O 3 /CdO composite showed an interesting grape-like porous microstructure following calcinations at elevated temperatures. A gas sensor using this In 2 O 3 /CdO composite as the sensing material showed higher sensitivity to different concentration of formaldehyde than the gas sensor based on pure flower-like In 2 O 3 nanomaterials. The In 2 O 3 /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 In 2 O 3 /CdO sensor has been discussed in detail.