Structural, optical and luminescence properties of CdTe quantum dots: Investigation on the effect of capping ligand ratio

Formation of ZnS quantum dots using green tea extract: applications to protein binding, bio-sensing, anti-bacterial and cell cytotoxicity studies

“…Depending on the measurement method used, ZnS shows a very wide bandgap energy 56,57 range, from 3.2 to 3.9 eV at 300 K; in addition, the bandgap of the synthesized nanocrystals relies on the doping of other elements 56 or on the ratio of the capping agents used. 58 In this case, the bandgap energy values found, which are lower than usual ZnS nanocrystal bandgap energy, 57,59 may be due to the use of GT extract (in excess). The fluorescence quantum yield (QY) of the ZnS-GT QDs was determined to be 11.99% using anthracene as the standard reference.…”

Synthesis and Characterization of Zinc Telluride Quantum Dots: Studies on the Structural and Optical Properties

“…The approximated band gap is; however, smaller than that of the bulk ZnTe (2.26 eV). The observed reduction in the energy band gap could be attributed to the surface defects density of undoped ZnTe [24,42].The slope of the different samples prepared varied due to the non-uniformity in particle sizes as confirmed by HRTEM analysis.The E values for the ZnTe nanoparticles were calculated by extrapolating the linear portion of the (khv) 2 verses hv curves to the hv axis (Figure 12). The E values for ZnTe prepared at 15, 30, 60, 180, 300 and 420 minutes were 2.27, 2.20, 2.19, 2.17, 2.16 and 2.01 eV respectively.…”

Capping Ligand Influence on the Structural, Optical and Luminescence Properties of CdTe Nanoparticles Prepared by a Simple Wet Chemical Process

“…According to studies on the effect of the capping ratio, it was reported that the concentration of the capping ligands affect the fluorescence intensity. In this report, the concentrations of all the capping ligands were kept constant in order to study how each of them affect the PL properties.…”