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

Title
Highly sensitive CO sensors based on cross-linked TiO2 hollow hemispheres
Authors
문희규심영석장호원김진상최경진강종윤최지원박형호윤석진
Keywords
CO sensors; TiO2; Hollow hemispheres; Nanostructured
Issue Date
2010-08
Publisher
Sensors and actuators. B, Chemical
Citation
VOL 149, NO 1, 116-121
Abstract
We report the fabrication of a highly sensitive gas sensor based on a network of nanostructured TiO2 hollow hemispheres (NTHH). O2 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 1–500ppm CO. Our sensor exhibits a very high response of 4220% change in resistance when exposed to 500ppm CO at 250 ℃, 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
http://pubs.kist.re.kr/handle/201004/37749
ISSN
0925-4005
Appears in Collections:
KIST Publication > Article
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