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    Structural, Optical, and Electrical Properties of Sputtered ZnO Thin Films and Their Application in Transparent Memory Devices
    (2022-12-01) ;
    Kaewkusonwiwat, S.
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    We report on the fabrication of ZnO thin films using a lab-made DC sputtering process. The ZnO films were prepared at several applied sputter voltages at fixed deposition times. The properties of the deposited films were characterized by x-ray diffraction, x-ray photoelectron spectroscopy, field-emission scanning electron microscopy, and UV–visible spectroscopy. The ZnO thin films exhibited a polycrystalline phase in the dominant (100) plane, with film thicknesses in the order of approximately 50–80 nm. In addition, a transparent memory device based on the ZnO film was successfully fabricated with a device structure of ITO/ZnO/EVA/ITO. The fabricated device exhibited high optical transparency of approximately 70% in the visible light region. The fabricated memory device demonstrated memory properties with a maximum ON/OFF current ratio of 4.66 × 10<sup>3</sup> and showed good retention properties.
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    Preparation of Composite Films of Rod-like Structure of ZnO and Corn Starch for Bending Sensor
    (2026-01-01)
    Feemuchang, Kitikamol
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    In this work, rod-like structure zinc oxide (R-ZnO) was synthesized by a hydrothermal process with the hydrothermal times of 3, 5, and 10 h. The effect of reaction time was reflected in the physical properties of the prepared R-ZnO, such as crystalline structure, shape geometries, and optical properties. Then, a bending device was fabricated with starch composite films and the rod-like structure of zinc oxide with different R-ZnO concentrations. The fabricated device exhibited flexibility characteristics at various bending angles. The composite film of corn starch and 1%wt. R-ZnO at a hydrothermal reaction time of 10 h demonstrated a high sensitivity at 89.5% with a gauge factor of 1.58. Moreover, the device of corn starch composited with R-ZnO exhibited fast response/recovery time of 0.23/0.15 s with high stability of bending cycle of more than 1,600 cycles. Therefore, the composite films of R-ZnO and natural starch are strong potential candidates for bending devices.