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      Is Open Access

      Monochelic Versus Telechelic Poly(Methyl Methacrylate) as a Matrix for Photoluminescent Nanocomposites with Quantum Dots

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          Abstract

          Nanocomposites based on CdSe or CdSe/ZnS quantum dots (QDs) and poly(methyl methacrylate) (PMMA) of different molecular weights and functionality were synthesized by ligand exchange of oleic acid with RAFT-based PMMA. The successful ligand exchange was confirmed by dynamic light scattering in combination with the approach “macromolecules—ghosts” and transmission electron microscopy. Comparative study of mono- and telechelics of PMMA revealed the similarities and differences in their behavior in formation of complexes with QDs and the optical properties of the corresponding nanocomposites. Telechelics exhibited higher efficiency in the complex formation and seemed to be promising candidates for the construction of devices based on QDs and polymer matrix for optical applications.

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          Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites

          C. B. Murray, D J Norris, M. G. Bawendi (1993)
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            Optical gain and stimulated emission in nanocrystal quantum dots.

            V I Klimov, A A Mikhailovsky, S Xu … (2000)
            The development of optical gain in chemically synthesized semiconductor nanoparticles (nanocrystal quantum dots) has been intensely studied as the first step toward nanocrystal quantum dot lasers. We examined the competing dynamical processes involved in optical amplification and lasing in nanocrystal quantum dots and found that, despite a highly efficient intrinsic nonradiative Auger recombination, large optical gain can be developed at the wavelength of the emitting transition for close-packed solids of these dots. Narrowband stimulated emission with a pronounced gain threshold at wavelengths tunable with the size of the nanocrystal was observed, as expected from quantum confinement effects. These results unambiguously demonstrate the feasibility of nanocrystal quantum dot lasers.
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              The surface science of nanocrystals.

              Michael A Boles, Daishun Ling, Taeghwan Hyeon … (2016)
              All nanomaterials share a common feature of large surface-to-volume ratio, making their surfaces the dominant player in many physical and chemical processes. Surface ligands - molecules that bind to the surface - are an essential component of nanomaterial synthesis, processing and application. Understanding the structure and properties of nanoscale interfaces requires an intricate mix of concepts and techniques borrowed from surface science and coordination chemistry. Our Review elaborates these connections and discusses the bonding, electronic structure and chemical transformations at nanomaterial surfaces. We specifically focus on the role of surface ligands in tuning and rationally designing properties of functional nanomaterials. Given their importance for biomedical (imaging, diagnostics and therapeutics) and optoelectronic (light-emitting devices, transistors, solar cells) applications, we end with an assessment of application-targeted surface engineering.
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                Author and article information

                Contributors
                Hua Wu: Role: Academic Editor
                Journal
                Journal ID (nlm-ta): Molecules
                Journal ID (iso-abbrev): Molecules
                Journal ID (publisher-id): molecules
                Title: Molecules
                Publisher: MDPI
                ISSN (Electronic): 1420-3049
                Publication date (Electronic): 07 July 2021
                Publication date Collection: July 2021
                Volume: 26
                Issue: 14
                Electronic Location Identifier: 4131
                Affiliations
                [1 ]Faculty of Materials Science, M.V. Lomonosov Moscow State University, Leninskie Gory 1-73, 119991 Moscow, Russia; chlorophyta98@ 123456gmail.com
                [2 ]Faculty of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russia; bkmarianna@ 123456yandex.ru (M.Z.B.); elitmanovich@ 123456yandex.ru (E.A.L.); bugakov.miron@ 123456gmail.com (M.A.B.)
                [3 ]A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospect 29, 119991 Moscow, Russia; o-karpov777@ 123456mail.ru (O.N.K.); gosha@ 123456ips.ac.ru (G.A.S.); alexander-eshov@ 123456yandex.ru (A.A.E.)
                [4 ]Faculty of Physics, M.V. Lomonosov Moscow State University, Leninskie Gory 1-2, 119991 Moscow, Russia
                Author notes
                Author information
                https://orcid.org/0000-0002-9151-5493
                https://orcid.org/0000-0002-0987-755X
                Article
                Publisher ID: molecules-26-04131
                DOI: 10.3390/molecules26144131
                PMC ID: 8303834
                PubMed ID: 34299406
                SO-VID: 493301dd-0280-496a-b2e9-7b3849e438a8
                Copyright © © 2021 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( https://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 02 June 2021
                Date accepted : 04 July 2021
                Categories
                Subject: Article

                Keywords: quantum dots,nanocomposites,raft polymerization,photoluminescence,dynamic light scattering
                Data availability:
                Keywords: quantum dots, nanocomposites, raft polymerization, photoluminescence, dynamic light scattering

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