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Author: search.filters.author.Pecharapa, WisanuSubject: search.filters.subject.Sol-gel method

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    Effect of titanium dopant on physical and optical properties Of Wo 3 thin films prepared by sol-gel method
    (2019-01-01)
    Kahattha, Chokchai
    ;
    Noonuruk, Russameeruk
    ;
    Pecharapa, Wisanu
    In this present work, the influence of incorporated Ti dopants on the physical and optical properties of WO <inf>3</inf> sol-gel derived thin films are investigated and represented. Ti-doped WO <inf>3</inf> thin films with different Ti doping contents (5 wt%, 10 wt%, and 20 wt%) are fabricated on F-doped tin oxide substrates using the spin coating technique. Tungsten powders and titanium butoxide are used as starting sources of the W and Ti ions, respectively. After the coating process, as-deposited films are annealed at 500°C for 2 h in ambient air. The effects of the dopant on the crystal structure, surface morphologies, chemical bonding, and optical properties of the films are investigated by the X-ray diffraction technique (XRD), scanning electron microscopy, Fourier transform infrared (FTIR), and ultraviolet-visible spectrophotometry. The XRD results indicate the monoclinic structure of the prepared films with a significant alteration in the crystalline size when the film was incorporated with the Ti dopant. The FTIR results reveal the deterioration in the W and O bonding as the film is doped with the Ti dopant. The optical band gaps of the films exhibit a significant blue shift with increasing the Ti doping content. The optical density change and cyclic voltammetry results indicate that the performance of WO <inf>3</inf> film applied as a smart window or energy storage can be enhanced by doping with Ti ions.
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    Role of Sb-dopant on physical and optical properties of ZnO thin film deposited by sol-gel-based coating method
    (2019-01-01)
    Sinornate, Wuttichai
    ;
    Mimura, Hidenori
    ;
    Pecharapa, Wisanu
    Sb-doped ZnO films were prepared by sol-gel spin coating technique on glass substrate. The sol-gel was prepared from zinc acetate dihydrate as zinc precursor and diethanolamine as sol stabilizer. Antimony (III) acetate was selected as the precursor of Sb. The doping concentration was varied from 0 to 10 mol%. The films were prepared by spin coating technique following by annealing at 500°C for 2 h in ambient air. The XRD exhibits ZnO hexagonal wurtzite without impurity phase. Their XRD peaks show deterioration in crystallinity that is in accordance with FESEM and TEM images showing decreasing in particle size with increasing doping content. The XPS confirm the existence of Sb<sup>3+</sup> that could substitute Zn<sup>2+</sup> on the zinc site or zinc vacancy. The photoluminescence results exhibit blue-shift with increasing Sb doping concentration. The transmittance spectra show high transmittance above 90% in visible region.
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    Preparation and characterization of cu-doped ZnO sol-gel derived optical thin films
    (2013-10-29)
    Chongsri, Krisana
    ;
    Aunpang, Siriwattana
    ;
    Techitdheera, Wicharn
    ;
    Pecharapa, Wisanu
    In this work, we report the preparation of Cu-doped ZnO thin films by sol-gel method based on zinc acetate dihydrate (CH<inf>3</inf>COO)<inf>2</inf>Zn·2H<inf>2</inf>O, Copper acetate dihydrate Cu<inf>3</inf>(CH<inf>3</inf>COO)<inf>2</inf>·H<inf>2</inf>O) and diethanolamine (HN(CH<inf>2</inf>OH)<inf>2</inf>, DEA). The precursor solution was prepared at various Cu composition ranging from 2-20 wt%. All films were spin-coated on borosilicate substrates for several coating repetition followed by annealing process at 550 °C for 4 h in an ambient air. The structural properties of the films were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD results indicate the domination of hexagonal wurtzite structure of ZnO with noticeable alternation in the XRD peak intensity upon Cu doping content. SEM results revealed the grain size shape and surface morphologies of as-prepared samples. Crucial optical properties of as-prepared films were scrutinized from their UV-Vis transmission spectra. The films are highly transparent in the visible region with more than 90% transparency within 380 nm to 800 nm. Their corresponding band gaps indicate significant red shift with increasing Cu doping content. Overall results suggest that Cu additive play a vital role on relevant optical properties of ZnO that can be adjusted to meet the requirement for practical optoelectronics applications. © (2013) Trans Tech Publications, Switzerland.