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(a), (b) Scanning electron microscopy (SEM) images, (c) X-ray powder diffraction (XRD) pattern, (d) high-resolution transmission electron microscope (HRTEM) image of the ZnO nanowire array hydrothermally grown on ITO coated glass and (e) photos of the EC device showing different colors at different voltages. Reproduced with permission from Ref. [33]; Copyright 2008 American Chemical Society.
