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(a) A typical cross-sectional SEM image of ZnO:Cu nanoneedles (sample N1). (b) TEM image of a ZnO:Cu nanoneedle and its corresponding high resolution TEM image is shown in (c). (d) Comparison of the SAED patterns of ZnO:Cu nanoneedles with the simulated patterns of ZnO. Some weak diffraction spots related to CuO were detected.
(Color online) XRD pattern of ZnO film, ZnO:Cu film, and as-fabricated ZnO:Cu nanoneedles on Si (100) substrate. Inset shows an enlarged (002) peak of ZnO:Cu samples.
Magnetization hysteresis loops of as-fabricated and annealed ZnO:Cu nanoneedles for sample N1 measured at . Inset shows the magnetization ratio before and after annealing for samples N1, N2, and ZnO:Cu film.
The saturated magnetization of as-fabricated and annealed samples N1, N2, and ZnO:Cu film measured at applied field of .
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