Influence of conditions for synthesis of CdTe nanocrystals on their photoluminescence properties and plasmon effect

Effect of medium pH on the optical properties of CdTe nanocrystals at colloidal synthesis and postsynthetic treatment

“…The instability constant of the complex formed by cadmium with EDTA ligand, (-COO-CH 2 ) 2 N-(CH 2 ) 2 -N(CH 2 -COO-) 2 , is 3.6 × 10 -17 (pK = 16.46). The complexation begins at pH 1, while even 99.9% of Cd produces the complex at pH 4.5 [12,13]. This hypothesis is confirmed by the fact that this procedure provides no CdTe NC stabilized with EDTA at pH > 5.…”

New features of excitonic emission in metal nanoparticle/semiconductor quantum dot nanosystem

“…Actually, it corresponds to the experimental conditions of the QD layer formation in both parts of the nanostructure [16]. Figure 3 shows also that the nanostructures studied in [16] are not optimal for the excitonic PL enhancement.…”

“…Actually, it corresponds to the experimental conditions of the QD layer formation in both parts of the nanostructure [16]. Figure 3 shows also that the nanostructures studied in [16] are not optimal for the excitonic PL enhancement. The PL enhancement by a factor of 4 could be achieved in the hybrid nanostructure if the thickness of the spacer layer was about 9.5 nm instead of 11.7 nm (optimal thickness in the case of gold NPs [17]) and the diameter of silver NPs was about 90 nm.…”

“…Figure 3 shows the experimentally measured [16] and theoretically calculated PL spectra of two parts of the nanostructure composed of colloidal CdTe QDs deposited on i) glass substrate and ii) glass substrate coated with the film of silver NPs coated in its turn with nine polyelectrolyte layers (≈ 11.7 nm thick) to spatially separate fluorophore layer from silver NP film. As seen in the Fig.…”

Effective size control through solvents in microwave aided synthesis of GSH- CdTe quantum dots

“…Further, the dielectric heating heats the whole volume uniformly and reduces thermal gradient effects, when compared to convective heating; allowing a better control over size dispersion [19]. It has been reported that the EG molecules participate in the stabilization of the nanocrystals and passivation of surface defects, with an optimum concentration for production of stably dispersed CdTe [28].…”