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Preparation and Characterization of One-dimensional Copper Oxide Nanostructures for Field Ionization Gas Sensors

Hassan, Ahmadvand | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44021 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Iraji Zad, Azam
  7. Abstract:
  8. The purpose of this project is to construct a gas sensor based on one-dimensional nanostructured electrodes of copper oxide. By creating of these nanostructures, can be reduced breakdown voltage of gases, including flammable, to a few hundred volts. The CuO nanowires were grown by thermal oxidation on copper substrate to form self-assembled. In this method, by heating the copper foil,Cu2O also was formed on substrate. Effects of surface tension of substrate and oxidation temperature on surface density and structure of the nanowires were studied. SEM images taken from the samples showed that the surface tensions increases the density of nanowires and increasing the oxidation temperature leads to the growth of CuO layer in hunk forms. Photodiode behavior of oxide layers and changes of the flow chart-voltage showed that the flow current in luminous environment is10 times more than dark. The absorption spectra of the layers indicated that the band gap energy for CuO and Cu2O is 1/45 and 2/1 electron volts respectively. The results of measurements breakdown voltage by inserting a metal plate in 200 micrometers distance of samples, showed the volumes breakdown voltage 260 and 270 volts for heliumand argon, and 245 and 365 volts for nitrogen and air,the error was ± 5 volts. Experimental observations indicated that environmental factors such ashumidity to 40% and gas pressure from1 to 2 atmospheres, does not affect sensor performance and measured10 times, created 1/5% fluctuation in the breakdown voltage
  9. Keywords:
  10. Gas Sensor ; Zinc Oxide ; Nanostructure ; Copper Oxide ; Field Ionization

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