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Triangular GaN nano/micro scale needles (TGN) grown on nickel coated c-plane sapphire substrate with highly dense ensemble of TGN and low dense ensemble of TGN have been investigated in the present work. The observed morphology of these TGN is in the form of triangular faceted needle like structures with average length in the order of fifty micrometres and cross-sections range from 500nm to 3μm near...
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