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The calculated band gap energies are greater than that of bulk CdSe.
These results are close to that of bulk CdSe.
The black bars at the top represent the XRD pattern of bulk CdSe (cubic).
Meanwhile, large grain sizes of bulk CdSe will lead to deficient contact between CdSe and TiO2-NTAs and weak interactions.
An optical bandgap of 1.71 eV is estimated for the CdSe layer from the absorption spectra, which is in good agreement with that of bulk CdSe.
Each as-prepared CdSe nanocrystal has a blue shift in the PL spectra, in comparison with that of bulk CdSe at 730 nm.
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Two diffraction peaks corresponding to the (111), (200), and (311) lattice planes of the CdSe cores match those of the bulk CdSe cubic (zinc blende) peaks.
Kim et al. [11] observed increase of photoluminescence peak energy with pressure for dilute dispersions of CdSe nanocrystals in toluene or 4-ethyl pyridine and attributed this to the pressure dependences of the bulk CdSe band gap and confinement energies.
Most likely, the actual changes of the bulk CdSe band gap and the electron and hole confinement energies are negligibly small within the temperature range from 260 to 270 K. Next, we can exclude the possibility of solvent freezing-point depression by addition of the NPs [12].
For CdSe cores, the peak positions agree well with the standard values of the wurtzite bulk CdSe.
Compared with CdSe, the band gap of bulk CdTe is narrow (1.56 eV, corresponding to approximately 795 nm wavelength).
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