Microemulsion Synthesis of Sheet-like Zinc Oxide Nanostructures as a Selective Gas Sensor to Ethanol
Paper ID : 1226-ICNS
Fahimeh Hoorabad Saboor *1, abbas ali Khodadadi2, Yadollah Mortazavi2
1Department of Chemical Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
2School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
Sheet-like zinc oxide nanostructures were prepared by the micro-emulsion method under different synthesis conditions. The samples were characterized by XRD, FESEM and BET surface area techniques. Sheet-like zinc oxide nanostructures as thick-film gas sensors were used for detection of 300 ppm of C2H5OH, CO and 1% CH4 in the air at 300-450C. Zinc oxide nanostructured sensors are sensitive and selective to ethanol with responses up to 100 times higher than those to CO and CH4. Changing the synthesis condition in the micro-emulsion method affects both the nanostructure and gas sensing response of the sensors. Both BET specific surface area and sensor resistance in the air decreases by increasing zinc nitrate and ammonia solution molarities. The average particle size of the synthesized samples increases in the high concentration of Zn2+ which is in consistent with sharp diffraction peaks in the XRD pattern of ME-synthesized sensors. The ME-Zn4 sensor showed a highly selective gas sensing response of about 106 to ethanol compared with low responses of about 2 and 1 to CO and CH4, respectively.
zinc oxide; gas sensor; sheet-like nanostructure; ethanol
Status : Abstract Accepted (Poster Presentation)