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

Hi Gyu Moon, Young Seok Shim, Ho Won Jang, Jin Sang Kim, Kyoung Jin Choi, Chong Yun Kang, Ji Won Choi, Hyung Ho Park, Soek Jin Yoon

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

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 °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.

Original languageEnglish
Pages (from-to)116-121
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume149
Issue number1
DOIs
Publication statusPublished - 2010 Aug 6
Externally publishedYes

Keywords

  • CO sensors
  • Hollow hemispheres
  • Nanostructured
  • TiO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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