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X-ray powder diffraction (XRD) pattern (a), SEM (b,c), TEM (d) images and satisfactory selected area electron diffraction (SAED) pattern (e) of the as-prepared spindle-like ZnO. Products synthesised by microwave and ultrasonic wave combined method. Reprinted from [888], Copyright (2019), with permission from Elsevier [OR APPLICABLE SOCIETY COPYRIGHT OWNER]. All rights reserved. In order to re-use permission must be obtained from the rightsholder.
