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TEM images from MWNTs mounted on grids prior to deposition. (a) After 10 cycles of Al2O3 ALD, nodular nuclei are readily seen. (b) After 15 cycles, the nuclei have grown into a rough but cohesive film coating. (c) After 100 and (d) 200 cycles, a smooth and conformal film coating is achieved. This trend follows closely that shown in Figures 3 and 5, obtained when the same type of nanotubes are coated using the fiber basket method.
