The XRD patterns of (a) samples, (b) the samples after NaOH treatment , and (c) CuO products and the corresponding EDX element analysis (inset).
Typical SEM images of the as-prepared samples. (a) The octahedral . (b) The sisal-like . (c) Low magnification of the sisal-like CuO. (d) High magnification of the nanoneedles of CuO.
[(a)–(d)] The time-dependent optical images during the octahedral was treated with NaOH solution. [(e)–(f)] SEM images taken for samples collected at different reaction times.
A schematic of the proposed mechanism for overall transformation.
(a) UV-vis absorption spectrum of the sisal-like CuO. (b) vs curves of the products.
(a) Wide X-ray photoelectron spectrum of the as-prepared CuO. [(b) and (c)] High-resolution XPS spectra for the and regions, respectively.
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