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可控合成具有Ch气敏性能的不同形貌ZnO
作者:李彩珠 赵晓华 李珍珍 武广利 娄向东 徐莎 
单位:河南师范大学化学化工学院 河南新乡453007 
关键词:气敏 氯气 氧化锌 可控合成 形貌 
分类号:O649
出版年,卷(期):页码:2016,44(1):0-0
DOI:
摘要:

 采用水热法,通过改变溶液pH值,可控合成了具有Cl2气敏性能的不同形貌ZnO。利用X射线衍射、扫描电子显 微镜、透射电子显微镜、比表面积测试、光致发光光谱对不同形貌的ZnO样品进行表征,分析了不同形貌ZnO的形成机理。 采用静态配气法对其气敏性能进行测试,且从比表面积、表面氧缺陷等角度分析了不同形貌ZnO与其Cl2气敏性能之间的关 系。结果表明:与pH值为11或12时得到的圆片状或汉堡状的ZnO相比,pH值为14或13时得到的棒花状或片花状ZnO 对CI2具有更好的气敏性能。棒花状或片花状ZnO可在较宽的体积浓度范围(1~3000)x10_6内对CI2进行检测,且响应和恢复 时间短:对体积浓度为100X10-5的Cl2,其响应时间分别为3和2 s,恢复时间分别为68和69 s。另外,2种花状ZnO对Cl2 有很好的选择性,且40 d的稳定性测试表明,其对CI2敏感特性基本保持不变。

 Zinc oxide (ZnO) particles with different morphologies were synthesized by a one-pot hydrothermal method at various pH values. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, specific surface area measurement and photoluminescence measurement, respectively. The formation mechanisms of ZnO with different morphologies were proposed. The gas-sensing properties of ZnO were evaluated via a static volumetric method. Moreover, the relationship between gas-sensing properties of ZnO and specific surface area and oxygen vacancy was also discussed. The results show that the sensors with either the nanorods flower-like ZnO (when pH=14) or the nanosheets flower-like ZnO (when pH=13) exhibit a higher response to Cl2 than the disk-like (when pH=11) or hamburg-like(pH=12) ZnO. The nanorods flower-like ZnO or the nanosheets flower-like ZnO can detect Cl2 in a wide concentration range (1-3000 x10^)for the short response and recovery time. The response time is only 2-3 s and the recovery time is only 68-69 s for 100x10^ Cl2, respectively. Also, the flower-like ZnO sensors show a superior selectivity to Cl2. After 40 d, the gas-sensing properties of the flower-like ZnO (when pH=14 or 13) are still stable

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