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Le, Top Khac,Kang, Manil,Kim, Sok Won Elsevier 2019 Materials science in semiconductor processing Vol.94 No.-
<P><B>Abstract</B></P> <P>Vanadium pentoxide (V<SUB>2</SUB>O<SUB>5</SUB>) films with micro-nanostructure were fabricated by an electrodeposition method using an aqueous solution of NH<SUB>4</SUB>VO<SUB>3</SUB>. The surface morphology and structural properties of the V<SUB>2</SUB>O<SUB>5</SUB> were investigated by SEM and XRD measurements. The results show that the annealing temperature strongly affects the surface morphology, crystal structure, and photoluminescence (PL) properties. The formation of α-V<SUB>2</SUB>O<SUB>5</SUB> structure occurred when the sample was annealed at temperatures below 500 ℃. As the annealing temperature increases, some of the α-V<SUB>2</SUB>O<SUB>5</SUB> structures were distorted and restructured to form a high-quality mix of α-β phase V<SUB>2</SUB>O<SUB>5</SUB>. This leads to great enhancement of the PL due to the presence of numerous defects on the surface of the V<SUB>2</SUB>O<SUB>5</SUB> films. Moreover, the mixing of the α-β phase V<SUB>2</SUB>O<SUB>5</SUB> leads to wide absorption and enhancement of the visible-light emission from V<SUB>2</SUB>O<SUB>5</SUB> micro-nanostructure.</P>
Control of morphology and Orientation of Electrochemically Grown ZnO Nanorods
Tran Hoang Cao Son,Le Khac Top,Nguyen Thi Dong Tri,Ha Thuc Chi Nhan,Lam Quang Vinh,Bach Thang Phan,김상섭,Le Van Hieu 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.2
We report the direct electrochemical deposition of ZnO nanorods on an indium tin oxide substrate. Themorphology and orientation of the grown ZnO nanorods were investigated as functions of the currentdensity. It is likely that the concentrations of OH- and Zn2+ ions, which could be controlled by varying thecurrent density, determine the shape and alignment of the ZnO nanorods. The nanorods were tilted, hexagonal,and prismatic at a low current density (0.1 mA/cm2) and vertically aligned and obelisk-shaped at highcurrent densities (greater than 0.6 mA/cm2). By using the low and high current densities sequentially in atwo-step growth process, vertically aligned, hexagonal, and prismatic ZnO nanorods could be grownsuccessfully. The underlying mechanism responsible for the growth of the ZnO nanorods is also discussed.