Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 136, Issue 1, Pages 80-85Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.10.057
Keywords
Gas sensor; Photocatalysis; Photocurrent; ZnO nanorods; Formaldehyde; Selectivity
Funding
- National Basic Research Program of China (973 Program) [2007CB613303]
- National Natural Science Foundation of China [20673049, 20703020]
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Zinc oxide nanorods were synthesized using a simple hydrothermal method. Form aldehyde-sensing characteristics were investigated without and with ultraviolet (UV) light irradiation. The gas response of nanorods to 110 ppm formaldehyde with UV light irradiation was about 120 times higher than that without UV light irradiation. The detection limit was as low as 1.8 ppm at room temperature. This high gas response under the UV light is attributed to photocatalytic oxidation. Furthermore, the significant improvements of the selectivity and recovery time were obtained after irradiating the nanorods with UV light. Our results demonstrated that applying UV light irradiation on the zinc oxide nanorods is an effective approach to achieve higher response and excellent selectivity to formaldehyde at room temperature. (C) 2008 Elsevier B.V. All rights reserved.
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