[논문]Preparation of ZnO Thin Film by Electrophoretic Deposition(EPD)

Jun, Byung-Sei

doi:10.4191/kcers.2012.49.1.078

Preparation of ZnO Thin Film by Electrophoretic Deposition(EPD) 원문보기

한국세라믹학회지 = Journal of the Korean Ceramic Society, v.49 no.1, 2012년, pp.78 - 83

Jun, Byung-Sei (Nano Materials Science and Engineering Department, Kyungnam University)

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The electrophoretic deposition(EPD) of ZnO nano-sized colloids is investigated by changing the colloid number concentration, applied force, and deposition time. The change of the colloid size in a suspension was examined by the different colloid number concentrations (N = $3.98{\times}10^{15}$, N = $3.98{\times}10^{14}$, and N = $3.98{\times}10^{13}$) with an increase of the deposition time and applied forces. Deposition behavior was investigated by changing the applied fields (from DC 5 V to 50 V) and the deposition time (5 min to 25 min). The surface microstructures of the as-deposited films were investigated by SEM. The dried films were sintered from $850^{\circ}C$ to $1,050^{\circ}C$ for 2 h and then the microstructures were also explored by SEM. The agglomeration rate was enhanced by increasing the colloid number concentration of colloids. Colloid number concentration in a suspension must be rapidly decreased at higher values of the electric field. ZnO nano-sized colloids had the highest zeta potential value of over -28 mV in methanol. A homogeneous microstructure was obtained at colloid number concentration of N = $3.98{\times}10^{13}$, applied DC field of 5 V/cm and 15 min of deposition time at an electrode distance of 1.5 cm. Under these conditions, the deposited films were sintered at $850^{\circ}C$ and $1,050^{\circ}C$ for 2 h. The results show a typical pore-free surface morphology of a uniform thickness of 400 nm under these experimental conditions.

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Until now, most the particle concentrations of solution for EPD have been based on weight. In this study, the number concentration concept for ZnO nano-sized colloids will be employed in order to explore how the green microstructure develops into a new regime during EPD. The agglomeration behavior and settling observation of the suspension under applied force will be examined to find the optimal EPD conditions, with a consideration of the colloid number concentration, the applied force and the deposition time in a suspension.

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Preparation of ZnO Thin Film by Electrophoretic Deposition(EPD) 원문보기

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