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Issue 9, 2007
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Photophysics of (CdSe)ZnS colloidal quantum dots in an aqueous environment stabilized with amino acids and genetically-modified proteins

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Abstract

Using a combination of two amino acids, histidine and N-acetyl-cysteine, to replace the original organic capping groups of (CdSe)ZnS quantum dots, water-soluble and highly luminescent (CdSe)ZnS quantum dots have been successfully prepared at pH 8. Characterization by steady-state and time-resolved photoluminescence spectroscopy, and transient absorption spectroscopy, demonstrate that the electronic properties of these quantum dots exceed those of the original as-synthesized samples dissolved in a more-conventional organic solvent. Furthermore, these amino acid-stabilized quantum dots have been assembled onto a cellulose substrate viacellulose bindingproteins that specifically bind to cellulose and was genetically engineered to harbor dual hexahistidine tags at the N- and C-termini to confer binding with the zinc(II) on the quantum dot surface. The spectroscopic measurements show that the protein-bound quantum dots continue to retain their desirable electronic properties when bound on the substrate. Meanwhile, the specific and very selective binding properties of the proteins have remained effective.

Graphical abstract: Photophysics of (CdSe)ZnS colloidal quantum dots in an aqueous environment stabilized with amino acids and genetically-modified proteins

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Publication details

The article was received on 30 Apr 2007, accepted on 27 Jun 2007 and first published on 10 Jul 2007


Article type: Paper
DOI: 10.1039/B706471C
Citation: Photochem. Photobiol. Sci., 2007,6, 1027-1033
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    Photophysics of (CdSe)ZnS colloidal quantum dots in an aqueous environment stabilized with amino acids and genetically-modified proteins

    X. Ai, Q. Xu, M. Jones, Q. Song, S. Ding, R. J. Ellingson, M. Himmel and G. Rumbles, Photochem. Photobiol. Sci., 2007, 6, 1027
    DOI: 10.1039/B706471C

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