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Choi, Kyoung Jin
Energy Conversion Materials (EcoMAT) Lab
Research Interests
  • Solar cells, thermoelectrics, piezoelectric

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Highly sensitive CO sensors based on cross-linked TiO2 hollow hemispheres

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Title
Highly sensitive CO sensors based on cross-linked TiO2 hollow hemispheres
Author
Moon, Hi GyuShim, Young-SeokJang, Ho WonKim, Jin-SangChoi, Kyoung JinKang, Chong-YunChoi, Ji-WonPark, Hyung-HoYoon, Soek-Jin
Keywords
CO sensors; Hollow hemispheres; Nanostructured; TiO2
Issue Date
2010-08
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.149, no.1, pp.116 - 121
Abstract
We report the fabrication of a highly sensitive gas sensor based on a network of nanostructured TiO2 hollow hemispheres (NTHH). O-2 plasma etching induces cross-linking of hexagonal-close-packed polystyrene array, which is adopted as a template substrate for room-temperature deposition of TiO2 thin film. High-temperature calcination effectively removes polystyrene template beads and promotes crystallization of TiO2, finally producing cross-linked NTHH via nanobridges. The gas-sensing capability of a NTHH-based sensor is demonstrated using 1-500 ppm CO. Our sensor exhibits a very high response of 4220% change in resistance when exposed to 500 ppm CO at 250 degrees C, whereas a gas sensor based on a plain TiO2 film shows a 195% change. The high sensitivity of the NTHH-based sensor is attributed to the enhanced gas sensing performance of the narrow nanobridges between hollow hemispheres.
URI
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DOI
10.1016/j.snb.2010.06.014
ISSN
0925-4005
Appears in Collections:
MSE_Journal Papers
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