Size Reduction of CdSe/ZnS Quantum Dots by a Peptidic Amyloid Supergelator

Anchoring of a self-assembling dipeptide on the surface of core/shell CdSe/ZnS quantum dots resulted in a competition between coordination of the surface atoms of the QDs and the strong tendency for the dipeptide to self-assemble in toluene. This resulted in a mild QD etching and in a corresponding...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2012-03, Vol.4 (3), p.1178-1181
Main Authors: Zaman, Md. Badruz, Bardelang, David, Prakesch, Michaël, Leek, Donald M, Naubron, Jean-Valère, Chan, Gordon, Wu, Xiaohua, Ripmeester, John A, Ratcliffe, Christopher I, Yu, Kui
Format: Article
Language:English
Subjects:
Amyloid - chemistry
Cadmium Compounds - chemistry
Chemical Sciences
Circular Dichroism
Gels - chemistry
Ligands
Magnetic Resonance Spectroscopy
Microscopy, Electron, Transmission
Particle Size
Peptides - chemistry
Quantum Dots
Selenium Compounds - chemistry
Spectrophotometry, Infrared
Spectrum Analysis
Sulfides - chemistry
Temperature
Time Factors
Toluene - chemistry
Zinc Compounds - chemistry
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Summary:Anchoring of a self-assembling dipeptide on the surface of core/shell CdSe/ZnS quantum dots resulted in a competition between coordination of the surface atoms of the QDs and the strong tendency for the dipeptide to self-assemble in toluene. This resulted in a mild QD etching and in a corresponding increase in the band gap of the nanocrystals whose photoluminescent emission gradually turns blue with time. The FmocLeuLeuOH dipeptide supergelator self-assembles in fibrils in which the Fmoc groups are surrounded by the pendant isobutyl side chains of the leucine residues with vibrational circular dichroism (VCD) and liquid- and solid-state NMR attributes of twist anti-parallel β-sheets.
ISSN:1944-8244
1944-8252
DOI:10.1021/am3001715