Ex situ XRD measurements were performed on a STOE STADI P transmission diffractometer (CuKa radiation, Ge monochromator), equipped with a position sensitive detector (PSD, internal resolution 2Q = 0.01Â°). The Scherrer equation was employed in the calculation of CuO crystallite diameters and the full width at half maximum (FWHM) determined by fitting a Lorentzian profile function to the CuO (111) and (200) diffraction peaks at 2Q = 38.371 and 38.923Â°, respectively.
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