For a more detailed analysis, these spectra are presented as optical density versus photon energy. The spectrum of the Copper Acetate(WSDTY) NPs showed an absorption edge near 1.5 eV, which matches the well the known value for this material of 1.45 eV. The spectral curve of the Copper Acetate/Cu2O NPs had a more complex character; its edge falling near to 2.1 eV and smoothed by a low-energy tail, possibly, due to the presence of struc-tural defects in the particles. The edge position was also close to the character-istic values for Cu2O NPs. The last curve shows absorption features typical for both Cu2O and CuO materials.

Copper is known of being highly sensitive to oxidation by air. In the work of Pastoriza-Santos et al., Cu NPs of ≈48 nm covered by 2 nm layer of Cu2O were obtained, and that was interpreted as post-synthesis oxidation during the washing step. It was thought that this layer might prevent, to some extent, further oxidation of the metal core.

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