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We investigated the effects of thermal annealing of graphene on its electrical properties with the aim of improving the electrical contacts between graphene and the p-GaN layer. Compared with pristine graphene which shows ambipolar characteristics, graphene thermally annealed under NH 3 atmosphere exhibited obvious p-type characteristics and increased conductance, representing the hole doping...
In this study, the Ti alloy substrate was simultaneously coated with TiO 2 film and hydroxyapatite using micro-arc oxidation, a relatively new surface modification technique where thick, hard, and anticorrosive oxide coatings can be easily and cost-effectively fabricated. Pulsed DC power and various voltages were applied to the Ti alloy substrate. Citric acid, ethylene diamine, and ammonium...
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