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      Graphene quantum dots: recent progress in preparation and fluorescence sensing applications

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          Abstract

          This paper reviews recent activities in the preparation and fluorescence sensing applications of graphene quantum dots.

          Abstract

          Fluorescent graphene quantum dots (GQDs) have attracted tremendous attention because of their unique 2D layered structure, large surface area, good water solubility, tunable fluorescence, high photostability, excellent biocompatibility and low toxicity, which make them promising candidates for applications in various fields. In this review, we summarize the latest progress in research on GQDs, focusing on their preparation viaboth top-down and bottom-up routes and application in fluorescence sensing of inorganic ions, organic molecules and biomaterials. This review provides insight into GQDs to inspire their further development, including their controllable preparation and use in a wider range of sensing applications, by the large community of researchers focusing on graphene.

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          Highly efficient visible-light-driven photocatalytic hydrogen production of CdS-cluster-decorated graphene nanosheets.

          Qin Li, Beidou Guo, Jiaguo Yu … (2011)
          The production of clean and renewable hydrogen through water splitting using photocatalysts has received much attention due to the increasing global energy crises. In this study, a high efficiency of the photocatalytic H(2) production was achieved using graphene nanosheets decorated with CdS clusters as visible-light-driven photocatalysts. The materials were prepared by a solvothermal method in which graphene oxide (GO) served as the support and cadmium acetate (Cd(Ac)(2)) as the CdS precursor. These nanosized composites reach a high H(2)-production rate of 1.12 mmol h(-1) (about 4.87 times higher than that of pure CdS nanoparticles) at graphene content of 1.0 wt % and Pt 0.5 wt % under visible-light irradiation and an apparent quantum efficiency (QE) of 22.5% at wavelength of 420 nm. This high photocatalytic H(2)-production activity is attributed predominantly to the presence of graphene, which serves as an electron collector and transporter to efficiently lengthen the lifetime of the photogenerated charge carriers from CdS nanoparticles. This work highlights the potential application of graphene-based materials in the field of energy conversion.
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            Blue luminescent graphene quantum dots and graphene oxide prepared by tuning the carbonization degree of citric acid

            Xiaomei Lin, Guonan Chen, Yuwu Chi … (2012)
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              Focusing on luminescent graphene quantum dots: current status and future perspectives.

              Lingling Li, Gehui Wu, Guohai Yang … (2013)
              To obtain graphene-based fluorescent materials, one of the effective approaches is to convert one-dimensional (1D) graphene to 0D graphene quantum dots (GQDs), yielding an emerging nanolight with extraordinary properties due to their remarkable quantum confinement and edge effects. In this review, the state-of-the-art knowledge of GQDs is presented. The synthetic methods were summarized, with emphasis on the top-down routes which possess the advantages of abundant raw materials, large scale production and simple operation. Optical properties of GQDs are also systematically discussed ranging from the mechanism, the influencing factors to the optical tunability. The current applications are also reviewed, followed by an outlook on their future and potential development, involving the effective synthetic methods, systematic photoluminescent mechanism, bandgap engineering, in addition to the potential applications in bioimaging, sensors, etc.
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                Author and article information

                Journal
                Journal ID (publisher-id): RSCACL
                Title: RSC Advances
                Abbreviated Title: RSC Adv.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Electronic): 2046-2069
                Publication date Created: 2016
                Publication date (Electronic): 2016
                Volume: 6
                Issue: 112
                Pages: 110775-110788
                Affiliations
                [1 ]College of Chemistry and Chemical Engineering
                [2 ]Hebei Normal University for Nationalities
                [3 ]Chengde 067000
                [4 ]China
                [5 ]Laboratory of Environmental Science and Technology
                [6 ]School of Natural Sciences and Humanities
                [7 ]Harbin Institute of Technology
                [8 ]Shenzhen 518055
                [9 ]School of Materials Science and Engineering
                Article
                DOI: 10.1039/C6RA24349E
                SO-VID: 7fa1e33a-7a0d-4866-ab9f-43f794b177ec
                Copyright © © 2016
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