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

doi:10.1016/j.snb.2010.06.014

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 journal › Article › peer-review

75 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 language	English
Pages (from-to)	116-121
Number of pages	6
Journal	Sensors and Actuators, B: Chemical
Volume	149
Issue number	1
DOIs	https://doi.org/10.1016/j.snb.2010.06.014
Publication status	Published - 2010 Aug 6
Externally published	Yes

Bibliographical note

Funding Information:
The authors thank Beom-Keun Yoo and Min-Gyu Kang for SEM measurements. This work was financially supported by the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (No. K0004114).

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

Access to Document

10.1016/j.snb.2010.06.014

Cite this

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title = "Highly sensitive CO sensors based on cross-linked TiO2 hollow hemispheres",

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.",

keywords = "CO sensors, Hollow hemispheres, Nanostructured, TiO",

author = "Moon, {Hi Gyu} and Shim, {Young Seok} and Jang, {Ho Won} and Kim, {Jin Sang} and Choi, {Kyoung Jin} and Kang, {Chong Yun} and Choi, {Ji Won} and Park, {Hyung Ho} and Yoon, {Soek Jin}",

note = "Funding Information: The authors thank Beom-Keun Yoo and Min-Gyu Kang for SEM measurements. This work was financially supported by the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (No. K0004114). ",

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AU - Moon, Hi Gyu

AU - Shim, Young Seok

AU - Jang, Ho Won

AU - Kim, Jin Sang

AU - Choi, Kyoung Jin

AU - Kang, Chong Yun

AU - Choi, Ji Won

AU - Park, Hyung Ho

AU - Yoon, Soek Jin

N1 - Funding Information: The authors thank Beom-Keun Yoo and Min-Gyu Kang for SEM measurements. This work was financially supported by the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (No. K0004114).

PY - 2010/8/6

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N2 - 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.

AB - 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.

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