Monolayer Co3O4 Inverse Opals as Multifunctional Sensors for Volatile Organic Compounds |
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| Authors: | Chul‐Soon Lee Zhengfei Dai Seong‐Yong Jeong Chang‐Hoon Kwak Bo‐Young Kim Do Hong Kim Prof Ho Won Jang Joon‐Shik Park Prof Jong‐Heun Lee |
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| Institution: | 1. Department of Materials Science and Engineering, Korea University, Seoul, Korea;2. Department of Chemistry, Kyoto University, Yoshidahonmachi, Sakyo Ward, Kyoto, Japan;3. Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, Korea;4. Smart Convergence Sensor Research Center, Korea Electronics Technology Institute, Gyeonggi-do, Korea |
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| Abstract: | 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. |
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| Keywords: | monolayers nanostructures sensors template synthesis thin films |
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