Meso- and Macroporous Co3O4 Nanorods for Effective VOC Gas Sensors
Meso- and Macroporous Co3O4 Nanorods for Effective VOC Gas Sensors
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DOI：
10.1021/jp1116189
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发表时间：
2011-05-05
影响因子：
3.7
通讯作者：
El-Safty, Sherif A.
中科院分区：
文献类型：
--
作者：
Hoa Nguyen;El-Safty, Sherif A.
多孔结构金属氧化物晶体纳米棒的合成是气体传感器技术中的一个重要课题，其目的是提高其灵敏度和稳定性。此外，开发一种简便的方法来合成大产量的纳米棒是降低厚膜气体传感器技术产品成本的关键因素。在不使用任何表面活性剂和模板导向剂的情况下，采用水热法以CoCl2和尿素为前驱体制备了高产量的结晶中孔/大孔Co3O4纳米棒。合成的纳米棒的气敏性能测试了挥发性有机化合物（VOCs），如苯、丙酮和乙醇。结果表明，晶体中孔和大孔Co3O4纳米棒对丙酮具有最高的灵敏度，响应速度快，恢复时间为1分钟。此外，晶体介孔/大孔Co3O4纳米棒的传感性能强烈依赖于载体（参比）气体，而预吸附氧在Co3O4纳米棒对VOCs的传感机制中起着重要作用。
The synthesis of crystalline nanorod metal oxides with porous structure is an important issue in gas sensor technology, which aims to increase their sensitivity and stability. In addition, the development of a facile method to synthesize large yields of nanorods is a key factor in reducing the cost of products in thick film gas sensor technology. Large yields of crystalline meso-/macroporous Co3O4 nanorods are fabricated using facile hydrothermal method from CoCl2 and urea precursors, without using any surfactants or template-directing agents. The gas-sensing properties of synthesized nanorods are tested to volatile organic compounds (VOCs) such as benzene, acetone, and ethanol. Results reveal that crystalline meso- and macroporous Co3O4 nanorods have the highest sensitivity to acetone with a fast response and a recovery time of one minute. Moreover, the sensing properties of crystalline meso-/macroporous Co3O4 nanorods depend strongly on carrier (reference) gases, whereas preadsorbed oxygen plays an important role in the sensing mechanism of Co3O4-based nanorod sensors for VOCs.