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(a) TEM image of the pristine MWCNTs; (b) High-magnification TEM image of the acid-treated MWCNT surface, arrow indicates nano-pit; (c) Nano-pit on the acid-treated MWCNTs is filled up with Al2O3 crystal; and (d) Rough surface of MWCNT produced by chemical vapour deposition (CVD) method. Adapted from References [12] and [32] with permissions. Copyright 2009, Elsevier Ltd. and 2008 IOP Publishing Ltd.
