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    Add as FriendDevelopment of a zno nanofilm gas sensor on different substrates

    by: Qahtan

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    1 : Development of a zno nanofilm gas sensor on different substrates presented by Ph. D. Postgraduate Qahtan G. Al-zaidi Under Supervision of Dr. A. M. Suhail –project proposer Dr. W. R. Al-azawi -co supervisor Optoelectronics Research Group E-mail: qahtaniliya@yahoo.co.uk Mobile:+009647702981421 Wednesday, November 06, 2013 Optoelectronics Research Group 1 Baghdad University-College of Science Department of Physics Optoelectronics Research Group
    2 : Outline of presentation Research plan objectives Objectives that have been achieved so far Objectives that are currently being undertaken Objectives that need to be accomplished
    3 : Project Goals Preparation of ZnO nanofilms by spray pyrolysis deposition technique. Sensitization of the prepared films by sensitive catalyst to improve the sensor characteristics. Investigation of the optical and electrical properties of ZnO sensing material both before and after sensitization. Fabrication of the electrodes mask and evaporation the electrodes on the prepared film samples. Construction of the sensor compartment that includes the gas chamber with the temperature control unit. The analysis of the measured data. Writing the thesis. Wednesday, November 06, 2013 Optoelectronics Research Group 3
    4 : Achievements Objectives recently fulfilled Preparation of the spray pyrolysis deposition system Depositing of the ZnO thin film on glass and Si substrates Maximizing the sensitivity by dipping in PdCl2 solution Thermal evaporation of the Al electrodes using the interdigitated mask Investigating the optical properties, i.e. absorption, transmission, and PL both before and after dipping (sensitization)
    5 : SMO ZnO Samples As – deposited ZnO sample with Al electrodes thermally evaporated PdCl2 – sensitized ZnO sample with Al electrodes thermally evaporated
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    8 : Absorption spectrum of as – deposited ZnO film
    9 : UV/VIS/NIR transmission curve of as – deposited ZnO film
    10 : Absorption spectrum of PdCl2 – dipped ZnO film
    11 : UV/VIS/NIR transmission curve of ZnO film of PdCl2 – dipped ZnO film
    12 : Energy gap Eg of SMO ZnO film Eg =3.15 eV
    13 : Research current status Testing samples for XRD, XRF, and trying to obtain the PL of a newly deposited ZnO thin film. Investigating the electrical properties and performing Impedence Spectroscopy to attain the Nyquist plot/ Cole – Cole plot Construction of the vacuum – tight gas sensor testing chamber with its accessories
    14 : AC measurements- Impedance spectroscopy Z*(w) = Z’ + j Z’’ = ZRe + jZIm = R + j X Nyquist plot / Cole-Cole plot
    15 : Gas sensor testing chamber
    16 : Digital Flow meter for H2 gas Flow rate sensitivity down to 0.1 mL/min.
    17 : Remaining objectives to be accomplished Investigate the sensing characterization parameters of the ZnO thin film such as: Dependence of sensor resistance on temperature Variation of sensitivity with time and estimating the rise time for different gas mixture ratios Examining the sensitivity variation with the operating temperature and for different concentrations (gas mixtures) Dependence of sensitivity on ZnO film thickness at various operating temperatures
    18 : Wednesday, November 06, 2013 Optoelectronics Research Group 18 Thank you

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