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- Title
Monolayer Co<sub>3</sub>O<sub>4</sub> Inverse Opals as Multifunctional Sensors for Volatile Organic Compounds.
- Authors
Lee, Chul‐Soon; Dai, Zhengfei; Jeong, Seong‐Yong; Kwak, Chang‐Hoon; Kim, Bo‐Young; Kim, Do Hong; Jang, Ho Won; Park, Joon‐Shik; Lee, Jong‐Heun
- 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.
- Subjects
MONOMOLECULAR films; OPALS; VOLATILE organic compounds; DETECTORS; HEAT treatment; CHEMICAL templates
- Publication
Chemistry - A European Journal, 2016, Vol 22, Issue 21, p7102
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201505210