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    Peptide-Mediated Constructs of Quantum Dot Nanocomposites for Enzymatic Control of Nonradiative Energy Transfer

    Year: 2011

    Journal: Nano Lett., 2011, 11 (4), 1530–1539, 20131009

    Authors: Urartu Ozgur Safak Seker, Tuncay Ozel, Hilmi Volkan Demir

    Organizations: Department of Electrical and Electronics Engineering, Department of Physics and UNAM—Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Turkey; Luminous! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Microelectronics Division, School of Physical and Mathematical Sciences, Physics and Applied Physics Division, Nanyang Technological University, 639798 Singapore

    A bottom-up approach for constructing colloidal semiconductor quantum dot (QDot) nanocomposites that facilitate nonradiative Förster-type resonance energy transfer (FRET) using polyelectrolyte peptides was proposed and realized. The electrostatic interaction of these polypeptides with altering chain lengths was probed for thermodynamic, structural, and morphological aspects. The resulting nanocomposite film was successfully cut with the protease by digesting the biomimetic peptide layer upon which the QDot assembly was constructed. The ability to control photoluminescence decay lifetime was demonstrated by proteolytic enzyme activity, opening up new possibilities for biosensor applications.