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Enhanced CO sensing characteristics of hierarchical and hollow In2O3 microspheres
- Authors
- Choi, Kwon-Il; Kim, Hae-Ryong; Lee, Jong-Heun
- Issue Date
- 6-May-2009
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- In2O3; Hierarchical nanostructures; Hollow spheres; Gas sensing kinetics
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.138, no.2, pp.497 - 503
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 138
- Number
- 2
- Start Page
- 497
- End Page
- 503
- ISSN
- 0925-4005
- Abstract
- Hierarchical and hollow In2O3 miciospheres were prepared by a solvothemal self-assembly reaction and their CO sensing characteristics were compared to those of an agglomerated counterpart. Upon exposure to 10-50 ppm CO at 400 degrees C, the gas responses (R-a/R-g; R-a: resistance in air, R-g: resistance in gas) of the hierarchical and hollow Structures were 1.6-2.7 times higher than that of the agglomerated sample. In addition, their 90% responses and recovery speeds were 23 times and 7.7 times higher, respectively. Their significantly improved gas responses and sensing/recovery kinetics were concluded to be Mated to the nanoporous and well-aligned nanostructures, which allow effective and rapid gas diffusion toward the sensing surfaces. (C) 2009 Elseviei B.V. All rights reserved.
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