Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 184, Issue -, Pages 78-84Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.04.052
Keywords
Zinc oxide; Gas-sensing; Nitrogen doping; Solution combustion synthesis
Funding
- Ministry of Education, China
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Among the various factors affecting the gas-sensing performance of ZnO, crystal defects have attracted less attention. In this letter, the gas-sensing property of a nitrogen doped ZnO powder was studied in detail in comparison with a nitrogen-free two-dimensional porous ZnO flake, which has been reported to possess a unique morphology favoring the gas-sensing performance. The nitrogen doped ZnO powders, which are several hundred nanometers in size, were fabricated in a flash by a solution combustion approach. The N/Zn atomic ratio was determined to be 0.04 by an elemental analysis. When compared with the nitrogen-free porous ZnO flakes, the nitrogen doped ZnO particles possessed more oxygen deficient species within the matrix of ZnO, and in turn exhibited a significantly improved gas-sensing property for detecting ethanol and acetone. The crystal defects arising from the nitrogen doping are thus argued to be more effective to improve the gas-sensing property of ZnO when compared with other efforts to control the particle size, surface area and the particulate morphology. (C) 2013 Elsevier B.V. All rights reserved.
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