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Author: search.filters.author.Chantarawong, Direklit

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    Influence of Phase Structure of TiO2 Nanoparticles on Resistive Switching Devices
    (2024-01-03)
    Tunhoo, Benchapol
    ;
    Chantarawong, Direklit
    ;
    Thiwawong, Thutiyaporn
    ;
    Onlaor, Korakot
    In this work, the electrical memory properties of a bi-stable device based on the structure of aluminum/poly (9-vinyl carbazole) (PVK): TiO<inf>2</inf> NPs/indium-tin-oxide (ITO) were reported. The effects of the modified phase structural of titanium dioxide nanoparticles (TiO<inf>2</inf> NPs) on the electrical memory characteristics were determined. The TiO<inf>2</inf> NPs were annealed at different annealing temperatures. The physical properties of the annealed TiO<inf>2</inf> NPs were characterized by transmission electron microscope and X-ray diffraction, which revealed the composition and structure of the anatase and rutile phases. Current-voltage measurements showed that the bi-stable characteristics were affected by the phase structure of the TiO<inf>2</inf> NPs. The ON/OFF current ratio of the fabricated device was noted to be approximately 2.06×10<sup>5</sup> in the case of TiO<inf>2</inf> NPs annealed at 500°C. A theoretical model was used to explain the charge injection mechanisms of the device. Moreover, the temperature dependence and retention-time measurements of the device were demonstrated.
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    Effect of ascorbic acid on structural properties of ZnO nanoparticles prepared by precipitation process
    (2015-07-01)
    Chaithanatkun, Natpasit
    ;
    Chantarawong, Direklit
    ;
    Songkeaw, Potiyan
    ;
    Onlaor, Korakot
    ;
    Thiwawong, Thutiyaporn
    In this work, zinc oxide nanoparticles (ZnO NPs) was prepared by chemical precipitation process. To study the influence of the ascorbic acid on properties of ZnO nanoparticles, the ascorbic acid was added to precursor solution at different molar ratio of ascorbic acid (AA) and zinc during the synthesis process. The characterizations of ZnO nanoparticles were performed using X-ray diffraction (XRD), Raman spectroscope, and field emission scanning electron microscopy (FE-SEM). The effect of ascorbic acid on the structural properties of ZnO NPs was investigated.
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    Electrical bistable properties of ZnO nanoparticles thin film prepared by electrostatic spray deposition technique
    (2015-07-01)
    Chaithanatkun, Natpasit
    ;
    Chantarawong, Direklit
    ;
    Songkeaw, Potiyan
    ;
    Onlaor, Korakot
    ;
    Thiwawong, Thutiyaporn
    Thin films of zinc oxide nanoparticles (ZnO NPs) for bistable device was prepared by electrostatic spray deposition technique based on an indium-tin oxide/ZnO NPs/aluminum (ITO/ZnO NPs /Al) structure. The characterizations of ZnO NPs films were performed using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM). The influence of the deposition time on properties of films was also investigated. Moreover, the effect of deposition time on the bistable properties can be performed by current-voltage (I-V) measurements. The conduction mechanism of the bistable device was analyzed by theoretical model.