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SEM and TEM characterization of ZnO samples. For ZnO-1, ZnO-2, ZnO-3, ZnO-5, ZnO-4, ZnO-6. (a1–f1) The low-magnification SEM; (a2–f2) high-magnification SEM. For ZnO-1, ZnO-2, ZnO-3, ZnO-5, (a3–d3) HRTEM; and (a4–d4) inverse FFT images from the region indicated by the solid box (red).
