Structural and optoelectronic properties of glucose capped Cu doped ZnO/ Zn(OH) 2 nanosheets

Gel-combustion-synthesized ZnO nanoparticles for visible light-assisted photocatalytic hydrogen generation

“…But V Zn emission of ZnO NPs was found to be at 405 nm. This was recorded by other researchers too [63,65]. The reason behind this blueshift is that V Zn reacts with oxygen to form oxygen antisites O Zn under oxidative conditions as given in equation (4) [62]:…”

“…The 510 nm green luminescence is responsible for degradation of optical properties in ZnO and by its characteristic absence it is understood that ZnO NPs can be favourably considered for optical applications [62]. The peaks at 498 and 485 nm in ZnO NPs, as observed in figure 8b, may be due to green DLE from CB to antisite oxygen occurring near valance band (VB) [63]. Nevertheless, the area under these peaks is very less compared with the entire PL spectrum, indicating the existence of only a small fraction of these defects in ZnO NPs.…”

“…does not capture electrons; in other words, it is not a recombination centre; hence it will not affect the photocatalytic activity [62]. The peaks at 451 and 423 nm are due to SLE from V Zn occurring near CB to VB [63]. The point defects of ZnO lattice were analysed using first principles pseudopotential method by Kohan et al [64].…”

Structural and optoelectronic properties of glucose capped Al and Cu doped ZnO nanostructures

“…Here, D is the crystallite size (nm), λ is the wavelength of the incident X-ray (nm), β is the full width at half maximum (FWHM) and θ is the diffraction angle [18]. Origin software was used to obtain the value of β and hence, the crystallite sizes of ZnO, ZnO:Al, ZnO:Cu and ZnO:Al,Cu were calculated to be 6.25 nm, 5.67 nm, 9.39 nm and 7.46 nm, respectively.…”