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Preparation of ZnO nanorods by microemulsion synthesis and their application as a CO gas sensor
- Preparation of ZnO nanorods by microemulsion synthesis and their application as a CO gas sensor
- Lim, Sang Kyoo; Hwang, Sung-Ho; Kim, Soonhyun; Park, Hyunwoong
- DGIST Authors
- Lim, Sang Kyoo; Hwang, Sung-Ho; Kim, Soonhyun
- Issue Date
- Sensors and Actuators, B: Chemical, 160(1), 94-98
- Article Type
- Alkyl Chain Lengths; Aspect Ratio; Benzene; BET Surface Area; Brunauer-Emmett-Teller Surface Areas; Chain Length; Chemical Sensors; Co Gas Sensor; Ethylbenzene; Gas Detectors; Gas Sensing Electrodes; Gas Sensing Properties; Gas Sensor; Large Aspect Ratio; Micro-Emulsion; Micro-Emulsion Method; Microemulsion Synthesis; Microemulsions; Nanocomposites; Nanorod; Nanorods; Oxygen Vacancies; Salts; Sensors; Sodium Salt; Sulfonic Acid; Surface Active Agents; Surface Area; Surface Defects; Surfactant Assisted; Zinc; Zinc Oxide; Zinc Oxide Nanorods; ZnO Nanorod
- Zinc oxide nanorods with different surface area were synthesized by surfactant assisted microemulsion method. The alkyl chain length of surfactant would affect aspect ratio of ZnO nanorods. ZnO nanorods synthesized by ethyl benzene acid sodium salt (EBS), which is surfactant with short alkyl chain length, show higher aspect ratio than ones by dodecyl benzene sulfonic acid sodium salt (DBS). These nanorods had diameters in the range of 80-300 nm and length of up to several microns. The Brunauer-Emmett-Teller (BET) surface area of the ZnO nanorods was strongly affected by the morphology of the nanorods. The BET surface area of the nanorods synthesized with EBS was higher than the surface area of the nanorods synthesized with DBS (20.2 and 14.1 m2/g for EBS and DBS, respectively). The response of ZnO nanorods to CO in air was strongly affected by surface area, defects and oxygen vacancies. The results demonstrate that the microemulsion synthesis is an easy and useful method to synthesize ZnO nanorods with large aspect ratio, which may enhance their gas sensing properties. © 2011 Elsevier B.V. All rights reserved.
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