Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 261, Issue -, Pages 537-549Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.01.162
Keywords
Co3O4 nanosheet-built hollow spheres; Layered double hydroxide; Neck-connected grains; Gas-sensing performance; Connected hole accumulation layer
Funding
- National Key RAMP
- D Program of China [2016YFC0201103]
- National Natural Science Foundation of China [11674320, 51471161]
- Anhui Provincial Natural Science Foundation [1408085J10]
- Youth Innovation Promotion Association CAS
- Key Research Projects of the Frontier Science CAS [QYZDB-SSW-JSC017]
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Through the hydrothermal approach, cobalt-based layered double hydroxide (Co-LDH) nanosheets were grown on the surfaces of polystyrene spheres (PSs), forming core-shell PS@Co-LDH composites. By calcinating such PS@Co-LDH composites at a low temperature, Co3O4 hollow spheres were then synthesized with a skeleton comprising many ultrathin (5.1 nm) porous nanosheets. Each nanosheet consisted of numerous primary grains approximately 5 nm in size and closely neck-connected with each other, as well as a large number of pores approximately 2-3 nm in size. The use of the Co3O4 nanosheet-built hollow spheres in high-performance gas sensors was found to be advantageous, as revealed by the low detection limit of 4.3 ppb for ethanol vapor and the short detection time of 4 s for dimethyl sulfide. To our knowledge, this detection limit for ethanol vapor is the lowest value in the actual test among p-type metal oxide semiconductor resistance-type gas sensors. Furthermore, a conduction model of the connected hole accumulation layer was proposed to explain the excellent gas sensing performances from Co3O4 nanosheet-built hollow spheres. (C) 2018 Elsevier B.V. All rights reserved.
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