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Ligand exchange dynamics and temperature effects upon formation of nanocomposites based on semiconductor CdSe/ZnS quantum dots and porphyrins: Ensemble and single object measurements
National Technical University of Belarus, Department of Information Technologies and Robotics, Minsk, Belarus.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
University of Zürich, Institute for Inorganic Chemistry, Zürich, Switzerland.
Institute of Physics, National Academy of Science of Belarus, Minsk, Belarus.
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2012 (English)In: Macroheterocycles, ISSN 1998-9539, Vol. 5, no 2, 98-114 p.Article in journal (Refereed) Published
Abstract [en]

Dye molecules with pyridyl side substituents (porphyrins and heterocyclic perylene diimides) coordinatively attached to semiconductor CdSe/ZnS quantum dots (QDs) surface form quasi-stable QD-Dye nanocomposites of various geometry in the competition with capping molecules (tri-n-octyl phosphine oxide or long chain amines) exchange. This results in photoluminescence (PL) quenching of the QDs both due to Foerster resonance energy transfer and formation of non-radiative surface states. QD surface is inhomogeneous with respect to the involved attachment and detachment processes. The formation of QD-Porphyrin nanocomposites is realized at least two time scales (60 and 600 s), which is attributed to a reorganisation of tri-n-octylphosphine oxide capping shell. In a low temperature range of 220÷240 K related changes in QD absorption and emission reveal a phase transition of the capping shell (tri-n-octyl phosphine oxide and amine). In QD-Dye nanocomposites, this phase transition is enhanced considerably by only a few attached dye molecules and has impact on the QD core structure followed by changes of PL quenching and exciton-phonon coupling. A combination of ensemble and single molecule spectroscopy of QD-Dye nanocomposites reveals that few or even only one attached dye molecule change the surface distribution and energy of dye related surface trap states considerably. © ISUCT Publishing.

Place, publisher, year, edition, pages
2012. Vol. 5, no 2, 98-114 p.
Keyword [en]
Fluorescence resonant energy transfer; Ligand dynamics; Photoluminescence quenching; Porphyrins; Self-assembly; Semiconductor quantum dots; Single objects spectroscopy; Surface traps; Temperature surface phase transition
National Category
Engineering and Technology Natural Sciences
URN: urn:nbn:se:liu:diva-100947DOI: 10.6060/mhc2012.120571zOAI: diva2:664510
Available from: 2013-11-15 Created: 2013-11-14 Last updated: 2013-11-15

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