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SEM images (a,b), TEM image (c) and SAED patterns (d and insets of c) of the flower-like ZnO nanostructures. Products synthesised by the microwave and ultrasonic wave combined method. Reprinted from [887], Copyright (2011), with permission from Elsevier [OR APPLICABLE SOCIETY COPYRIGHT OWNER]. All rights reserved. In order to re-use permission must be obtained from the rightsholder.
