Highly sensitive CO sensors based on cross-linked TiO2 hollow hemispheres
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- Highly sensitive CO sensors based on cross-linked TiO2 hollow hemispheres
- Moon, Hi Gyu; Shim, Young-Seok; Jang, Ho Won; Kim, Jin-Sang; Choi, Kyoung Jin; Kang, Chong-Yun; Choi, Ji-Won; Park, Hyung-Ho; Yoon, Soek-Jin
- CO sensors; Hollow hemispheres; Nanostructured; TiO2
- Issue Date
- ELSEVIER SCIENCE SA
- SENSORS AND ACTUATORS B-CHEMICAL, v.149, no.1, pp.116 - 121
- 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.
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