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(a) FE-SEM image of the electrospun copper acetate∕PVA composite fibers aligned in random orientation. (b) FE-SEM and (c) TEM images of the CuO nanofibers synthesized by calcinations of sample (a) at for . (d) Selected area electron diffraction pattern of the same sample.
(Color online) XRD results for CuO nanofibers prepared by calcination of the copper acetate∕PVA precursor fibers at for .
(Color online) (a) Gate-dependent measurement of a single CuO nanofiber contacted with Ag electrodes. Measurements were done at room temperature. Upper inset: Schematic view of a nanofiber FET configuration. The source and drain contacts are silver stripes, and heave doped -type Si substrate serves as the back gate. Bottom inset: FE-SEM image of a diameter CuO nanofiber with a length of suspending across the silver electrodes. (b) Enlarged plot of (a). Inset: Current vs gate voltage at .
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