Controlled synthesis of (CuO-Cu2O)Cu/ZnO multi oxide nanocomposites by facile combustion route: A potential photocatalytic, antimicrobial and anticancer activity

Red Microalgal Sulfated Polysaccharide–Cu2O Complexes: Characterization and Bioactivity

“…31−33 It has been shown that the antibacterial activity of Cu 2 O-based nanoparticles derives from copper-induced plasmid DNA degradation in a dose-dependent manner in both Gram-positive and Gram-negative bacteria. 32,34 Toxic effects of polymer-coated CuO nanoparticles have also been shown in the green microalga Chlamydomonas reinhardtii. 35 In addition, it has been shown that Cu administered as a hybrid−Cu−chitosan complex was similarly highly effective against fungi and different bacterial strains 36,37 even under anaerobic conditions (although Cu can be rapidly oxidized).…”

“…Al-Awady et al, for example, developed polyelectrolyte-coated titania NPs with up to four layers of polyelectrolytes of alternating charge. A cationic outer layer (i.e., bare nanoparticles) was found to be a more effective antimicrobial than the anionic outer layer polyelectrolyte, probably by virtue of the increased adhesion of the cationic nanoparticles to the bacterial membrane. − It has been shown that the antibacterial activity of Cu 2 O-based nanoparticles derives from copper-induced plasmid DNA degradation in a dose-dependent manner in both Gram-positive and Gram-negative bacteria. , Toxic effects of polymer-coated CuO nanoparticles have also been shown in the green microalga Chlamydomonas reinhardtii . In addition, it has been shown that Cu administered as a hybrid–Cu–chitosan complex was similarly highly effective against fungi and different bacterial strains , even under anaerobic conditions (although Cu can be rapidly oxidized). , Moreover, Cu 2 O has been widely used in hospitals as an antimicrobial agent, significantly reducing the occurrence of hospital-acquired infections and their costs .…”

Influence of Ag on the Structural, Electrochemical, Antibacterial, and Photocatalytic Performance of the (CuO–Cu2O)Cu Nanocomposite

“… 27 However, chemical state differentiation of Cu was difficult to be found with XPS since the Cu 2p binding energies of Cu + and Cu metal were almost the same. 28 The presence of two satellite peaks at higher binding energies of 943.7 and 962.1 eV is typical of materials having a d9 configuration in their ground state, which obliviously shows the presence of Cu 2+ . 29 …”

“…In the photocatalytic dye decoloration reaction, the water and oxygen molecules are directly influencing the formation of superoxide radicals (O 2 •– ) by the presence of e – in the conduction band (eq ) and hydroxyl radicals (OH •– ) (eq ) by the presence of holes in the valence band, respectively. The generated radicals play a vital role in the photocatalytic dye decoloration activities by braking of complex dye structures into eco-friendly byproducts. , normalA normalg ( C u O − C u 2 O ) normalC normalu + normalh ν ( l i g h t e n e r g y ) → normalA normalg ( C u O C u 2 O ) normalC normalu * ( e n e r g y ) normalA normalg false( normalC normalu normalO − normalC normalu 2 normalO false) normalC normalu * ( e n e r g y ) .25em → normalA …”

“…The photocatalytic efficiency of CuO is further enhanced if it is in the form of a heterostructure like CuO/Cu 2 O/Cu compared to that of a single phase compound. 11 The advantages of green syntheses over chemical and physical approaches include the following: environmental friendliness, affordability, and ease of scaling up for large-scale nanoparticle synthesis. 12 In addition, there is no need to utilize harmful chemicals and high temperatures, pressures, or energies.…”