Flame-spray-made undoped zinc oxide films for gas sensing applications

Sensors (Basel). 2010;10(8):7863-73. doi: 10.3390/s100807863. Epub 2010 Aug 23.

Abstract

Using zinc naphthenate dissolved in xylene as a precursor undoped ZnO nanopowders were synthesized by the flame spray pyrolysis technique. The average diameter and length of ZnO spherical and hexagonal particles were in the range of 5 to 20 nm, while ZnO nanorods were found to be 5-20 nm wide and 20-40 nm long, under 5/5 (precursor/oxygen) flame conditions. The gas sensitivity of the undoped ZnO nanopowders towards 50 ppm of NO(2), C(2)H(5)OH and SO(2) were found to be 33, 7 and 3, respectively. The sensors showed a great selectivity towards NO(2) at high working temperature (at 300 °C), while small resistance variations were observed for C(2)H(5)OH and SO(2), respectively.

Keywords: C2H5OH; NO2; SO2; flame spray pyrolysis; gas sensor; undoped ZnO.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Gases / analysis*
  • Hot Temperature
  • Microscopy, Electron, Scanning
  • Microscopy, Electron, Transmission / methods
  • Nanostructures / chemistry*
  • Nanotechnology / methods*
  • Nanotubes
  • Surface Properties
  • X-Ray Diffraction
  • Zinc Oxide / chemistry*

Substances

  • Gases
  • Zinc Oxide