0000000000336235

AUTHOR

Xiangxing Xu

showing 3 related works from this author

Bio serves nano: biological light-harvesting complex as energy donor for semiconductor quantum dots.

2012

Light-harvesting complex (LHCII) of the photosynthetic apparatus in plants is attached to type-II core-shell CdTe/CdSe/ZnS nanocrystals (quantum dots, QD) exhibiting an absorption band at 710 nm and carrying a dihydrolipoic acid coating for water solubility. LHCII stays functional upon binding to the QD surface and enhances the light utilization of the QDs significantly, similar to its light-harvesting function in photosynthesis. Electronic excitation energy transfer of about 50% efficiency is shown by donor (LHCII) fluorescence quenching as well as sensitized acceptor (QD) emission and corroborated by time-resolved fluorescence measurements. The energy transfer efficiency is commensurable …

Light-Harvesting Protein ComplexesSulfidesPhotochemistryAbsorptionLight-harvesting complexQuantum DotsElectrochemistryCadmium CompoundsGeneral Materials ScienceAbsorption (electromagnetic radiation)Selenium CompoundsSpectroscopyFluorescent Dyesbusiness.industryChemistryPeasSurfaces and InterfacesCondensed Matter PhysicsFluorescenceAcceptorNanocrystalEnergy TransferSemiconductorsAbsorption bandQuantum dotZinc CompoundsOptoelectronicsTelluriumbusinessVisible spectrumLangmuir : the ACS journal of surfaces and colloids
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Assembly and Separation of Semiconductor Quantum Dot Dimers and Trimers

2011

Repeated precipitation of colloidal semiconductor quantum dots (QD) from a good solvent by adding a poor solvent leads to an increasing number of QD oligomers after redispersion in the good solvent. By using density gradient ultracentrifugation we have been able to separate QD monomer, dimer, and trimer fractions from higher oligomers in such solutions. In the corresponding fractions QD dimers and trimers have been enriched up to 90% and 64%, respectively. Besides directly coupled oligomers, QD dimers and trimers were also assembled by linkage with a rigid terrylene diimide dye (TDI) and separated again by ultracentrifugation. High-resolution transmission electron micrographs show that the …

ChemistrySurface PropertiesDimerAnalytical chemistryTrimerGeneral ChemistrySubstrate (electronics)PhotochemistryBiochemistryCatalysisSolventchemistry.chemical_compoundColloidColloid and Surface ChemistryMonomerSemiconductorsDiimideQuantum DotsDensity gradient ultracentrifugationParticle SizeDimerization
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Comparison of quantum dot-binding protein tags: Affinity determination by ultracentrifugation and FRET

2013

Abstract Background Hybrid complexes of proteins and colloidal semiconductor nanocrystals (quantum dots, QDs) are of increasing interest in various fields of biochemistry and biomedicine, for instance for biolabeling or drug transport. The usefulness of protein–QD complexes for such applications is dependent on the binding specificity and strength of the components. Often the binding properties of these components are difficult and time consuming to assess. Methods In this work we characterized the interaction between recombinant light harvesting chlorophyll a / b complex (LHCII) and CdTe/CdSe/ZnS QDs by using ultracentrifugation and fluorescence resonance energy transfer (FRET) assay exper…

ChemistryBinding proteinBiophysicsNanoparticleProtein tagBiochemistryCrystallographyB vitaminsFörster resonance energy transferQuantum dotQuantum DotsFluorescence Resonance Energy TransferNanoparticlesUltracentrifugeChlorophyll Binding ProteinsUltracentrifugationMolecular BiologyBinding selectivityProtein BindingBiochimica et Biophysica Acta (BBA) - General Subjects
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