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Quasi-aligned undoped ZnO nanorods with diameter in the range 100–300nm and length of several micrometers have been grown catalyst-free on Si(100) wafer in a one-step process by direct heating of Zn powders. All nanowires are single crystals and are aligned vertically to the substrate surface with c-axis preferred orientation. XRD, HRTEM and Raman studies revealed that the ZnO nanorods have wurtzite...
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