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    Öğe
    Influence of Different Aluminum Sources on the NH3 Gas-Sensing Properties of ZnO Thin Films
    (Springer, 2018) Ozutok, Fatma; Karaduman, Irmak; Demiri, Sani; Acar, Selim
    Herein we report Al-doped ZnO films (AZO) deposited on the ZnO seed layer by chemical bath deposition method. Al powder, Al oxide and Al chloride were used as sources for the deposition process and investigated for their different effects on the NH3 gas-sensing performance. The morphological and microstructural properties were investigated by employing x-ray powder diffraction, scanning electron microscopy analysis and energy-dispersive x-ray spectroscopy. The characterization studies showed that the AZO thin films are crystalline and exhibit a hexagonal wurtzite structure. Ammonia (NH3) gas-sensing measurements of AZO films were performed at different concentration levels and different operation temperatures from 50 degrees C to 210 degrees C. The sample based on powder-Al source showed a higher response, selectivity and short response/recovery time than the remaining samples. The powder Al sample exhibited 33% response to 10-ppm ammonia gas at 190 degrees C, confirming a strong dependence on the dopant source type.
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    Öğe
    Optical and Electrochemical Properties of PB-ZnO and PB-ZnO/MWCNT Nanocomposite Films Deposited by Chemical Bath
    (Int Information & Engineering Technology Assoc, 2018) Ozutok, Fatma; Yakar, Emin
    The first aim of this study was to investigate the ZnO modification effect on the prussian blue (PB) films. A second aim of the study was to determine the decoration effect of multi walled carbon nanotube (MWCNT) on the PB-ZnO nanocomposite films which could be deposited by chemical bath. The electrochemical behaviour of PB films was systematically studied using ZnO-orZnO/MWCNT modification. Additionally, detailed optical properties of nanocomposite films were determined by UV-VIS, FTIR and Raman spectroscopy. Optical transparency was severely decreased by ZnO modification onto PB film but the decoration of MWCNTs did not change the optical transparency of film compared to PB film. PB, ZnO and MWCNT presence in the nanocomposite films were proven by FTIR spectrum. Stretching vibration peak of C=N shifted to short-wavelength for PB-ZnO nanocomposite films and same peak disappeared with MWCNT coating due to the structural distortion. ZnO modification and MWCNT coating affected the electrochemical properties due to the different factors such as OH-group effect in film growth process, Zn2+ substitution with Fe2+ site and interaction between ferricyanide ions and oxygen.