Fig. 3
From: Synthesis, Characterization, Luminescent and Nonlinear Optical Responses of Nanosized ZnO
a FTIR spectra of ZnO NPs isolated from EtOH solution (red line); abs. EtOH (pink line); TEA (yellow green line); ZnO NPs in EtOH solution (blue line); all placed between KBr windows; ZnAc2 × 2H2O (green line) and ZnO NPs solid precipitate from EtOH (black line) (tablets in в KBr). b Tauc plot of (αhν)2 versus photon energy hν for residual ZnO NPs in abs. EtOH solution