Advances in Natural Sciences Nanoscience and Nanotechnology · 2012 · 36 citations · 8 references
Natural SciencesChemistryMaterials ScienceBiophotonicsNanomaterialsOptical MaterialsFluorescence SpectroscopyInorganic NanoparticlesLuminescent MaterialsQuantum DotsQuantum Dots In BiologySemiconductor NanomaterialsBovine Serum AlbuminOptical PropertiesPh StabilityPhotoluminescencePhotoluminescence SpectroscopyPhysiological Ph EffectsQuantum Dot PhotophysicsSurfactant Effects
Abstract Water soluble CdSe/CdS quantum dots (QDs) have been synthesized directly in aqueous solution with sodium citrate as surfactant agent. The QDs are mono-dispersed in water and have strong luminescent emission intensity under excitation of ultraviolet light. The emission maxima of the QDs can be tuned in a wider range from 555 to 615 nm in water by changing synthesis conditions. The result of the synthesis of water-soluble CdSe and CdSe/CdS QDs shows the high quality of the QDs with the quite narrow luminescence emission band and photostability. The results show the strongest intensity of photoluminescence emission in media with pH value at about from 8–8.5, which are pH physiological environments. The luminescence intensity increases when the QDs are coated with a polyethylene glycol (PEG) or bovine serum albumin (BSA) protein layer, the lifetime also increases.
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B. O. Dabbousi, J. Rodríguez‐Viejo, Frederic V. Mikulec et al. · The Journal of Physical Chemistry B · 1997 · 4.2K citations
Natural Sciences, Materials Engineering, Materials Science +17