Meso- and Macroporous Co3O4 Nanorods for Effective VOC Gas Sensors

被引：270
作者：
Hoa Nguyen [1 ]
El-Safty, Sherif A. [1 ,2 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
[2] Waseda Univ, Grad Sch Adv Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 17期
关键词：
HYDROTHERMAL SYNTHESIS; PERFORMANCE; HYDROGEN; ETHANOL; NO2;
D O I：
10.1021/jp1116189
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：8466 / 8474
页数：9
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