Abstract
Free-standing Cu nanorod arrays on Cu foil have been fabricated by a template-assistedmethod. Cu nanorods were potentiostatically deposited on mechanically polished Cu foilusing anodized aluminum oxide templates as the deposition mask. Three electrolytesystems were compared, including two acid copper sulfate based solutions andone alkaline solution. The most uniform nanorods were achieved in the alkalineelectrolyte. The weight gain per unit area after electrodeposition has been used as adirect measure of average length of deposited Cu nanorods. It was found that ourcontrol over the uniformity in nanorod length across the array is important inreaching the maximized aspect ratio without aggregation. Through controlling theweight change it was possible to control the aspect ratio of nanorods and to avoidaggregation of nanorods. Our capability to fabricate free-standing Cu nanorodarrays of uniform height with maximized aspect ratio on Cu foil is especiallyimportant in applying this nanostructured Cu as a current collector in Li ionbatteries.
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