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      Capping nanoparticles with graphene quantum dots for enhanced thermoelectric performance†

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          Abstract

          The general capability of graphene quantum dots to serve as capping ligands exchanging native organic stabilizers for various types of semiconductor nanoparticles affords the opportunity to engineer functional nanocomposites with remarkable thermoelectric properties.

          Abstract

          Graphene quantum dots (GQDs) are shown to serve as phase transfer agents to transfer various types of nanoparticles (NPs) from non-polar to polar solvents. Thorough characterization of the NPs proves complete native ligand exchange. Pellets of this GQD–NP composite show that the GQDs limit the crystal size during spark plasma sintering, yielding enhanced thermoelectric performance compared with NPs exchanged with inorganic ions. A photoluminescence study of the GQD–NP composite also suggests energy transfer from GQDs to NPs.

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          Low-temperature processed electron collection layers of graphene/TiO2 nanocomposites in thin film perovskite solar cells.

          Jacob Wang, James Ball, Eva Barea … (2014)
          The highest efficiencies in solution-processable perovskite-based solar cells have been achieved using an electron collection layer that requires sintering at 500 °C. This is unfavorable for low-cost production, applications on plastic substrates, and multijunction device architectures. Here we report a low-cost, solution-based deposition procedure utilizing nanocomposites of graphene and TiO2 nanoparticles as the electron collection layers in meso-superstructured perovskite solar cells. The graphene nanoflakes provide superior charge-collection in the nanocomposites, enabling the entire device to be fabricated at temperatures no higher than 150 °C. These solar cells show remarkable photovoltaic performance with a power conversion efficiency up to 15.6%. This work demonstrates that graphene/metal oxide nanocomposites have the potential to contribute significantly toward the development of low-cost solar cells.
          Article 0 comments Cited 287 times – based on 0 reviews     Review now
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            Upconversion and downconversion fluorescent graphene quantum dots: ultrasonic preparation and photocatalysis.

            Shujuan Zhuo, Mingwang Shao, Shuit-Tong Lee (2012)
            A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconverted emission is presented. The as-prepared GQDs exhibit an excitation-independent downconversion and upconversion photoluminescent (PL) behavior, and the complex photocatalysts (rutile TiO(2)/GQD and anatase TiO(2)/GQD systems) were designed to harness the visible spectrum of sunlight. It is interesting that the photocatalytic rate of the rutile TiO(2)/GQD complex system is ca. 9 times larger than that of the anatase TiO(2)/GQD complex under visible light (λ > 420 nm) irradiation in the degradation of methylene blue.
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              Structural, optical, and electrical properties of self-assembled films of PbSe nanocrystals treated with 1,2-ethanedithiol.

              Qing Song, J Luther, Susan L. Perkins … (2008)
              We describe the structural, optical, and electrical properties of high-quality films of PbSe nanocrystals fabricated by a layer-by-layer (LbL) dip-coating method that utilizes 1,2-ethanedithiol (EDT) as an insolubilizing agent. Comparative characterization of nanocrystal films made by spin-coating and by the LbL process shows that EDT quantitatively displaces oleic acid on the PbSe surface, causing a large volume loss that electronically couples the nanocrystals while severely degrading their positional and crystallographic order of the films. Field-effect transistors based on EDT-treated films are moderately conductive and ambipolar in the dark, becoming p-type and 30-60 times more conductive under 300 mW cm(-2) broadband illumination. The nanocrystal films oxidize rapidly in air to yield, after short air exposures, highly conductive p-type solids. The LbL process described here is a general strategy for producing uniform, conductive nanocrystal films for applications in optoelectronics and solar energy conversion.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Chem Sci
                Journal ID (iso-abbrev): Chem Sci
                Title: Chemical Science
                Publisher: Royal Society of Chemistry
                ISSN (Print): 2041-6520
                ISSN (Electronic): 2041-6539
                Publication date (Print): 15 July 2015
                Publication date (Electronic): 13 April 2015
                Volume: 6
                Issue: 7
                Pages: 4103-4108
                Affiliations
                [a ] CAS Key Lab for Nanosystem and Hierarchy Fabrication , National Center for Nanoscience and Technology , Beijing , 100190 , China . Email: lucg@ 123456nanoctr.cn ; Email: zytang@ 123456nanoctr.cn
                [b ] Key Laboratory of Synthesis and Natural Functional Molecular Chemistry of Ministry of Education , College of Chemistry & Materials Science , Northwest University , Xi'an , 710069 , China . Email: xiegang@ 123456nwu.edu.cn
                [c ] Carbon Research Laboratory , Center for Nano Materials and Science , State Key Laboratory of Fine Chemicals , School of Chemical Engineering and Key Laboratory for Micro/Nano Technology of Liaoning Province , Dalian University of Technology , Dalian 116024 , China
                Article
                Publisher ID: c5sc00910c
                DOI: 10.1039/c5sc00910c
                PMC ID: 5497257
                SO-VID: 8300ca24-785c-4a18-a5cb-fc87437a9048
                Copyright © This journal is © The Royal Society of Chemistry 2015
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution 3.0 Unported License ( http://creativecommons.org/licenses/by/3.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 12 March 2015
                Date accepted : 13 April 2015
                Categories
                Subject: Chemistry

                Notes

                †Electronic supplementary information (ESI) available. See DOI: 10.1039/c5sc00910c


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