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(a) SEM image of ZnO tubes growing by the microwave heating method showing well faceted end and side surfaces. (b) SEM images of different stages of ZnO tubes by the microwave heating method. Products synthesised by the microwave sintering. Reprinted from [868], Copyright (2005), with permission from Elsevier [OR APPLICABLE SOCIETY COPYRIGHT OWNER]. All rights reserved. In order to re-use permission must be obtained from the rightsholder.
