Abstract
Cuprous oxide-based nanocrystals were synthesized by conventional sol-gel techniques under an ambient environment. Herein, we systematically examined how Na ion influences the optical and structural characteristics of the nanocrystal. The X-ray diffraction exhibits Cu2O and Cu2O:Co nanocrystals have cubic structure (Pn-3m) with average crystallite sizes of 41.70 and 43.00 nm, respectively. Photoluminescence and FT-IR spectra clearly show the existence of CuO phase due to Na, Co doping. HR-TEM micrograph exhibits that the particle size ranges between 0.89–1.11 μm, and that agglomeration diminishes with Na, Co doping concentration. The optical bandgap of Cu2O based nanocrystals were found to be reduced and improves optical absorption in the visible region. Eventually, XPS measurement gives us the existence of several oxidation states of Cu and Co and a single oxidation state of Na.
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