journal article·2022-02Open access

Restriction‐In‐Motion of Surface Ligands Enhances Photoluminescence of Quantum Dots—Experiment and Theory

Justin M. Fang, Sayan Basu, Mingda Li, Kuo‐Chih Shih, Jun Wang, Mircea Cotlet, Xudong Wang, Jing Zhao, T. J. Mountziaris, Joseph J. LoTurco, Mu‐Ping Nieh

Advanced Materials Interfaces· Volume 9· Issue 6

Abstract

Abstract The relationship between emission and ligand restriction of a series of ZnSe/ZnS quantum dots (QDs) encapsulated in nanoparticles is investigated systematically via experiments and quantum theory. The QDs have a ZnSe core and a ZnS shell, capped with hydrophobic ligands (triotylphosphine oxide/hexadecylamine), allowing them to be entrapped in a model biomembrane, bicelle, made of zwitterionic dipalmitoyl and dihexanoyl phosphatidylcholines and charged dipalmitoyl phosphatidylglycerol. Enhanced photoluminescence is observed upon encapsulation, depending on the QD‐to‐lipid ratio. Transmission electron microscopy and small‐angle X‐ray scattering confirm that QDs are preferably situated at the rim of bicellar discs. A simplified quantum dissipation heat‐bath theory is proposed to correlate the enhancement with slower nonradiative processes caused by the restriction‐in‐motion (RIM) of the surface ligands. However, Förster resonance energy transfer due to QD aggregation counteracts the effect.
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Research context

OpenAlex topics: Quantum Dots Synthesis And Properties · Gold and Silver Nanoparticles Synthesis and Applications · Nanocluster Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Biomedical Engineering University of Connecticut Storrs CT 06269 USA

Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA

Polymer Program Institute of Materials Science University of Connecticut Storrs CT 06269 USA

Department of Chemical Engineering University of Massachusetts Amherst MA 01003 USA

Center for Functional Nanomaterials Brookhaven National Lab Upton NY 11973–5000 USA

Department of Chemistry University of Connecticut Storrs CT 06269 USA

Physiology and Neurobiology University of Connecticut Storrs CT 06269 USA

Department of Chemical and Biomolecular Engineering Department Polymer Program Institute of Materials Science University of Connecticut Storrs CT 06269 USA

Funding

National Science Foundation · University of Connecticut · National Institutes of Health · National Institute of General Medical Sciences · U.S. Department of Energy · Brookhaven National Laboratory

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