Ultra-highly fluorescent N doped carbon dots-CdTe QDs nanohybrids with excitation-independent emission in the blue-violet region

Abstract

The photoluminescence quantum yield of N-doped carbon dots was brought up to 84% by hybridizing with CdTe QDs.

Nanocomposite of CuInS/ZnS and Nitrogen-Doped Graphene Quantum Dots for Cholesterol Sensing

“…First, the N-GQDs are bound to the surface of the CIS/ZnS QDs and serve as ligands instead of MPA. 44 − 60 Second, the carboxylate groups in MPA are bonded with N-GQDs and lead to energy transfer between N-GQDs and CIS/ZnS QDs. Consequently, N-GQDs can act as a capping agent with MPA on the CIS core.…”

“…Regarding the nanocomposite particles, two different types of lattice spacing corresponding to 0.26 nm of N-GQDs and 0.35 nm of CIS/ZnS QDs are detected. Therefore, in these particles, the N-GQDs and CIS/ZnS QDs are combined tightly as a whole …”

“…The increase of the negative charge refers to a more stable compound due to the reaction between CIS/ZnS QDs and N-GQDs. The NG/CIS/ZnS QD nanocomposite can be used as a biosensor. − …”

“…This can be explained based on the electron transfer process between the CIS/ZnS QDs and N-GQDs. The full width at half-maximum (FWHM) of the nanocomposite is calculated to be 98 nm, while that for N-GQDs is 80 nm that detects recombination in the hybrid structures of N-GQDs and CIS/ZnS QDs. − There are two approaches to quenching the emission of QDs. First, the N-GQDs are bound to the surface of the CIS/ZnS QDs and serve as ligands instead of MPA. − Second, the carboxylate groups in MPA are bonded with N-GQDs and lead to energy transfer between N-GQDs and CIS/ZnS QDs.…”

“…The full width at half-maximum (FWHM) of the nanocomposite is calculated to be 98 nm, while that for N-GQDs is 80 nm that detects recombination in the hybrid structures of N-GQDs and CIS/ZnS QDs. − There are two approaches to quenching the emission of QDs. First, the N-GQDs are bound to the surface of the CIS/ZnS QDs and serve as ligands instead of MPA. − Second, the carboxylate groups in MPA are bonded with N-GQDs and lead to energy transfer between N-GQDs and CIS/ZnS QDs. Consequently, N-GQDs can act as a capping agent with MPA on the CIS core. , The results thus suggest that a lower concentration of CIS/ZnS with 0.5 favors and produces an optimum fluorescence in the nanocomposite.…”