Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 155, Issue 2, Pages 512-518Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.12.055
Keywords
Gas sensors; In2O3; Hollow spheres; C2H5OH sensors
Funding
- Korean government (MEST) [R0A-2008-000-20032-0]
- Ministry of Knowledge Economy [M2008010013]
- Korea Institute of Industrial Technology(KITECH) [M2008010013] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In2O3 hollow spheres with shell thicknesses of similar to 150 nm and similar to 300 nm were prepared by the one-pot synthesis of indium-precursor-coated carbon spheres via hydrothermal reaction and subsequent removal of core carbon by heat treatment. The gas response (R-a/R-g, R-a: resistance in air, R-g: resistance in gas) of the thin hollow spheres to 100 ppm C2H5OH was 137.2 at 400 degrees C, which was 1.86 and 3.84 times higher than that of the thick hollow spheres and of the nanopowders prepared by precipitation, respectively. The gas sensing characteristics are discussed in relation to the shell configuration of the hollow spheres. The enhanced gas response of the hollow spheres was attributed to the effective diffusion of analyte gas toward the entire sensor surface via very thin and nano-porous shells. (C) 2011 Elsevier B.V. All rights reserved.
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