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Monolayer Co 3 O 4 Inverse Opals as Multifunctional Sensors for Volatile Organic Compounds
Author(s) -
Lee ChulSoon,
Dai Zhengfei,
Jeong SeongYong,
Kwak ChangHoon,
Kim BoYoung,
Kim Do Hong,
Jang Ho Won,
Park JoonShik,
Lee JongHeun
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201505210
Subject(s) - monolayer , inverse , materials science , optoelectronics , analytical chemistry (journal) , nanotechnology , chemistry , environmental chemistry , mathematics , geometry
Monolayers of periodic porous Co 3 O 4 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 Co 3 O 4 IO thin films having periodic pores ( d ≈500 nm) showed a high response of 112.9 to 5 ppm C 2 H 5 OH 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.