Studies of structural, optical, and electrical properties associated with defects in sodium-doped copper oxide (CuO/Na) nanostructures

Biosynthesis of Flower-Shaped CuO Nanostructures and Their Photocatalytic and Antibacterial Activities

“…Rietveld analysis of XRD pattern is shown in Fig. 2 a. Refinement was undertaken in space group C 2h 6 , C2/C for monoclinic CuO with all atoms in general positions [ 57 , 58 ]. The marked (110), (002), ( 11), (111), (200), (11 ), (20 ), (112), (020), (021), (022), (11 ), (113), (310), (113), and (220) hkl diffraction planes (│standing line for Bragg position θ) are well indexed to standard CuO (JCPDS card No.…”

“…2a. Refinement was undertaken in space group C 6 2h , C2/C for monoclinic CuO with all atoms in general positions [57,58]. The marked (110), (002), ( After numerous recursive refinements, the possible bestrefined lattice parameters obtained are as follows (weighted profile factor (R wp ) = 12.3, profile factor (R p ) = 11.9, expected R-factor (R exp ) = 7.8, Bragg R-factor (R Bragg ) = 7.02, goodness of fit (GOF) = 1.03 and χ 2 = 1.48) with unit cell parameters a = 4.6878 Ǻ, b = 3.4269 Ǻ, and c = 5.14567 Ǻ, and crystallite size ~ 15.7 nm, by using Scherrer's formula [56].…”

Pitch‐Black Nanostructured Copper Oxide as an Alternative to Carbon Black for Autonomous Environments

“…Due to the remarkable differences in the size of the radius of Na + (1.02 Å) and Cu 2+ (0.73 Å) and in the valence charges, the presence of the external Na + impurity may affect the growth process of the crystal, leading to the dissimilar irregular morphology as observed in Figure S4, Supporting Information. [ 23 ] It is also found that the crystallite size decreases with the presence of a small amount of Na + (Table S1, Supporting Information). [ 23 ] The washing and filtration procedure after the precipitation is the same for the all the samples synthesized in this study.…”

“…[ 23 ] It is also found that the crystallite size decreases with the presence of a small amount of Na + (Table S1, Supporting Information). [ 23 ] The washing and filtration procedure after the precipitation is the same for the all the samples synthesized in this study. Hence, decrease in the Cu/Na molar ratio during the synthesis leads to the presence of Na + in the CuCO 3 .Cu(OH) 2 precipitate even after the washing and filtration.…”

“…[ 19,20 ] It has also been emphasized that the bandgap of CuO is tunable by means of different approaches such as dopants, synthesis solvent and stoichiometry, nanoparticle size, and the shape of the nanostructure as well as the morphology. [ 12,21–23 ] At present, most of the bandgap‐engineering studies of CuO focus on optimum optical response to solar radiation and its catalytic behavior [ 21,23 ] ; however, ways to tailor its near full absorption in the visible and reflection in the NIR range remain limited. There have been efforts to improve the blackness of CuO by physically tailoring the particle size via ball milling or other techniques.…”