Juglans regia L. mediated synthesis of cobalt oxide and zinc-doped cobalt oxide nanoparticles: characterization and evaluation for environmental, antibacterial and cytotoxic potential

Structural and optical properties of green-synthesised tricobalt tetroxide nanoparticles

“…. Tauc's plot (figure7(b)) provides two direct band gaps, which strongly support the reported literature on the Co 3 O 4 compound[54,69,[78][79][80][81]. These multiple direct band gap values, around 3.7 eV and 2.2 eV, may result from the sample's energy band degeneracy and their charge transfer through the hopping process[54,78,82,83].…”

Catalytic removal of soot particles over potassium glasses – the effect of doping with aliovalent redox metals

“…50 These two peaks predominated the reported Co 3 O 4 spectra. 51,52 The remaining bands at 367 nm, 545 nm, and 603 nm observed in the spectra can be attributed to the d–d transitions of Co 2+ in both octahedral and tetrahedral coordinations. 41,45 A sharp maximum centered at around 200 nm can be attributed to the presence of impurities.…”

Electrochemical performances and antibacterial activity of green synthesized cobalt oxide nanoparticles and poly (o‐Phenylenediamine) based textile supercapacitor

“…The optical property studies of Co 3 O 4 show two absorption bands in the wavelength ranges from 350–450 to 600–700 nm. The peaks at 235 and 550 nm can be attributed to the charge transfer processes, respectively 27–29 . In Figure 4b from the spectra of PoPD‐1, three main absorption regions have been observed.…”

“…The peaks at 235 and 550 nm can be attributed to the charge transfer processes, respectively. [27][28][29] In Figure 4b from the spectra of PoPD-1, three main absorption regions have been observed. The first absorption maxima at 295 nm correspond to the π-π* transition of the benzenoid rings and the band at 380 nm suggests the existence of quinoid imine units in the polymer matrix.…”