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Charge-controlled assembling of bacteriorhodopsin and semiconductor quantum dots for fluorescence resonance energy transfer-based nanophotonic applications
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10.1063/1.3533392
/content/aip/journal/apl/98/1/10.1063/1.3533392
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/1/10.1063/1.3533392
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Figures

Image of FIG. 1.
FIG. 1.

Schematics of hybrid materials consisting of QDs of different surface charges and thicknesses of organic coatings and PMs containing bR. [(a) and (b)] CdSe/ZnS QDs coated with negatively charged cysteine or positively charged cysteamine self-assembled on the surface of PM. These coatings ensure thinnest QDs coatings and such hybrid materials demonstrate very efficient FRET from QD to bR. [(c) and (d)] CdSe/ZnS QDs coated with trifunctional SH-PEG-COOH and SH-PEG-OH ligands, respectively, self-assembled on the PM. These QD coatings are thicker than that for cysteine or cysteamine and demonstrate lower FRET (for SH-PEG-COOH coating) or even absence of energy transfer (for SH-PEG-OH) when QDs are assembled with the PM. (e) Absorption of bR (energy acceptor, purple line) and PL of QDs (energy donors) of different diameters (PL colors).

Image of FIG. 2.
FIG. 2.

Integrated PL in hybrid materials build from QDs of different colors or of different organic coatings as a function of bR-to-QD molar ratio. (a) Variation of integrated PL of CdSe/ZnS QD570 (PL ), QD610, and QD650 as a function of concentration of purple or white membranes. All QDs were covered with cysteine. (b) Influence of charge and thickness of QDs coating layer on PL of CdSe/ZnS QD570 as a function of bR-to-QD molar ratio. The concentration of QD was always fixed at and dilution factor and internal filter effects were taken into account. The optical densities in these experiments were always .

Image of FIG. 3.
FIG. 3.

AFM images of bR within its purple membrane and the same images for the assemblies of PM with QDs with different surface coatings. (a) AFM image of bR trimers forming hexagonal crystal lattice with a period of 6.2 nm. (b) Typical AFM image of QDs capped with trifunctional PEG derivative (SH-PEG-OH) assembled on the PM-patch. Here, QDs are self-assembled on the edges of the PM. (c) Typical image of QDs covered with the low-molecular-weight cysteine or cysteamine ligands which are quasiepitaxied at the surface of the PM-patch. (d) Zoom of (c) showing that the disposition of quasiepitaxied QDs on the surface of PM corresponds to the hexagonal crystal lattice of bR with a period constant similar to that for the period of bR trimers in (a).

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/content/aip/journal/apl/98/1/10.1063/1.3533392
2011-01-05
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Charge-controlled assembling of bacteriorhodopsin and semiconductor quantum dots for fluorescence resonance energy transfer-based nanophotonic applications
http://aip.metastore.ingenta.com/content/aip/journal/apl/98/1/10.1063/1.3533392
10.1063/1.3533392
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