Monolayer Co3O4 Inverse Opals as Multifunctional Sensors for Volatile Organic Compounds
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- 作者：Chul-Soon Lee ; Zhengfei Dai ; Seong-Yong Jeong ; Chang-Hoon Kwak ; Bo-Young Kim ; Do Hong Kim ; Prof. Ho Won Jang ; Joon-Shik Park and Prof. Jong-Heun Lee
- 刊名：Chemistry - A European Journal
- 出版年：2016
- 出版时间：May 17, 2016
- 年：2016
- 卷：22
- 期：21
- 页码：7102-7107
- 全文大小：2361K
- ISSN：1521-3765
文摘
Monolayers of periodic porous Co3O4 inverse opal (IO) thin films for gas-sensor applications were prepared by transferring cobalt-solution-dipped polystyrene (PS) monolayers onto sensor substrates and subsequent removal of the PS template by heat treatment. Monolayer Co3O4 IO thin films having periodic pores (d≈500 nm) showed a high response of 112.9 to 5 ppm C2H5OH at 200 °C with low cross-responses to other interfering gases. Moreover, the selective detection of xylene and methyl benzenes (xylene+toluene) could be achieved simply by tuning the sensor temperature to 250 and 275 °C, respectively, so that multiple gases can be detected with a single chemiresistor. Unprecedentedly high ethanol response and temperature-modulated control of selectivity with respect to ethanol, xylene, and methyl benzenes were attributed to the highly chemiresistive IO nanoarchitecture and to the tuned catalytic promotion of different gas-sensing reactions, respectively. These well-ordered porous nanostructures could have potential in the field of high-performance gas sensors based on p-type oxide semiconductors.