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Mercaptosilane-Passivated CuInS2 Quantum Dots for Luminescence Thermometry and Luminescent Labels
Department of Molecular Sciences and Nanosystems, Università Ca’ Foscari Venezia, Venezia-Mestre, Italy. Institut National de la Recherche Scientifique, Centre Énergie, Matériaux, Télécommunications (INRS−EMT), Université du Québec, Varennes, Québec, Canada.
Unit of Nanomaterials Chemistry, University of Namur, Department of Chemistry, Namur, Belgium.
Institut National de la Recherche Scientifique, Centre Énergie, Matériaux, Télécommunications (INRS−EMT), Université du Québec, Varennes, Québec, Canada.
CNR-IMM Sezione di Bologna, Bologna, Italy.
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2019 (English)In: ACS Applied Nano Materials, ISSN 2574-0970, Vol. 2, no 4, p. 2426-2436Article in journal (Refereed) Published
Abstract [en]

Bright and nontoxic quantum dots (QDs) are highly desirable in a variety of applications, from solid-state devices to luminescent probes in assays. However, the processability of these species is often curbed by their surface chemistry, which limits their dispersibility in selected solvents. This renders a surface modification step often mandatory to make the QDs compatible with the solvent of interest. Here, we present a new synthetic approach to produce CuInS2 QDs compatible with organic polar solvents and readily usable for the preparation of composite materials. 3-Mercaptopropyl trimethoxysilane (MPTS) was used simultaneously as solvent, sulfur source, and capping agent for the QD synthesis. The synthesized QDs possessed a maximum photoluminescence quantum yield around 6%, reaching approximately 55% after growing a ZnS shell. The partial condensation of MPTS molecules on the surface of QDs was probed by solid-state nuclear magnetic resonance, whose results were used to interpret the interaction of the QDs with different solvents. To prove the versatility of the developed QDs, imparted by the thiolated silane molecules, we prepared via straightforward procedures two nanocomposites of practical interest: (i) silica nanoparticles decorated with QDs and (ii) an inexpensive polymeric film with embedded QDs. We further demonstrate the potential of this composite film as a luminescence thermometer operational over a broad temperature interval, with relative thermal sensitivity above 1% K–1 in the range of biological interest.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 2, no 4, p. 2426-2436
Keywords [en]
CuInS2, silane, quantum dots, composites, luminescent films, thiolates, luminescence thermometry
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Experimental Physics
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URN: urn:nbn:se:ltu:diva-74420DOI: 10.1021/acsanm.9b00317ISI: 000466443000072OAI: oai:DiVA.org:ltu-74420DiVA, id: diva2:1323437
Note

Validerad;2019;Nivå 2;2019-06-12 (johcin)

Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-06-12Bibliographically approved

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Enrichi, Francesco

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