基于在液相加工复合材料中的应用前景,对比氧化石墨烯(GO),采用原子力显微镜(AFM)、动态光散射(DLS)、透射电镜(TEM)和X射线光电子能谱(XPS)表征了一种批量生产的石墨烯量子点(GQDs)的形貌及结构,并研究了其在17种常见溶剂及5种同/异构二醇类溶剂中的分散性能。结果表明:这种单层、平均片径7.0nm、富含O、N官能团的GQDs具有强极性的特点,除水外在二甲基亚砜(DMSO)和乙二醇中的分散性能最优,其内在原因归于溶剂极性和溶剂分子间氢键作用的影响。
Based on promising application in composite material by liquid phase processing and compared with graphene oxide (GO),the surface morphology and chemical structure of large-scale commercial graphene quantum dots (GQDs) were characterized by atomic force microscope (AFM),dynamic light scattering (DLS),transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS).And the dispersion behavior of GQDs in seventeen ordinary organic solvents and five glycol solvents with different chain length or molecular structure were investigated.The results showed that as the single-layer,7.0nm average diameter as well as a lot of O- and N-containing groups,GQDs was endowed with characteristic of strong polarity.GQDs appeared the best dispersion behavior in dimethyl sulphoxide (DMSO) and ethylene glycol besides in water,due to the solvent polarity and hydrogen bond interaction.
[1] Paredes J I,Villar-Rodil S,Martínez-Alonso A,et al.Graphene oxide dispersions in organic solvents[J].Langmuir,2008,24(19):10560-10564.
[2] Dreyer D R,Park S,Bielawski C W,et al.The chemistry of graphene oxide[J].Chem Soc Rev,2010,39(1):228-240.
[3] Goharshadi E K,Akhlamadi G,Mahdizadeh S J.Investigation of graphene oxide nanosheets dispersion in water based on solubility parameters:a molecular dynamics simulation study[J].RSC Adv,2015,5(129):106421-106430.
[4] Mehmood Ahmad R T,Hong S H,Shen T Z,et al.Water-assisted stable dispersal of graphene oxide in non-dispersible solvents and skin formation on the GO dispersion[J].Carbon,2016,98(1):188-194.
[5] Konios D,Stylianakis M M,Stratakis E,et al.Dispersion behaviour of graphene oxide and reduced graphene oxide[J].J Colloid Interface Sci,2014,430(1):108-112.
[6] Liu F,Jang M H,Ha H D,et al.Facile synthetic method for pristine graphene quantum dots and graphene oxide quantum dots:origin of blue and green luminescence[J].Adv Mater,2013,25(27):3657-3662.
[7] Jang M H,Ha H D,Lee E S,et al.Is the chain of oxidation and reduction process reversible in luminescent graphene quantum dots？[J].Small,2015,11(31):3773-3781.
[8] Li L L,Wu G H,Yang G H,et al.Focusing on luminescent graphene quantum dots:current status and future perspectives[J].Nanoscale,2013,5(10):4015-4039.
[9] Kim S,Hwang S W,Kim M K,et al.Anomalous behaviors of visible luminescence from graphene quantum dots:interplay between size and shape[J].ACS Nano,2012,6(9):8203-8208.
[10] Wang C,Wu C,Zhou X,et al.Enhancing cell nucleus accumulation and DNA cleavage activity of anti-cancer drug via graphene quantum dots[J].Sci Rep,2013,3(10):2852-2859.
[11] Li X,Rui M,Song J,et al.Carbon and graphene quantum dots for optoelectronic and energy devices:a review[J].Adv Funct Mater,2015,25(31):4929-4947.
[12] Gupta V,Chaudhary N,Srivastava R,et al.Luminscent graphene quantum dots for organic photovoltaic devices[J].J Am Chem Soc,2011,133(26):9960-9963.
[13] Sun H,Wu L,Wei W,et al.Recent advances in graphene quantum dots for sensing[J].Mater Today,2013,16(11):433-442.
[14] Zhu Z,Ma J,Wang Z,et al.Efficiency enhancement of perovskite solar cells through fast electron extraction:the role of graphene quantum dots[J].J Am Chem Soc,2014,136(10):3760-3763.
[15] Song X J,Zhou Q Z,Zhang T,et al.Pressure-assisted preparation of graphene oxide quantum dot-incorporated reverse osmosis membranes:antifouling and chlorine resistance potentials[J].J Mater Chem A,2016,4(43):16896-16905.[16] Li Q Q,Chen B L,Xing B S.Aggregation kinetics and self-assembly mechanisms of graphene quantum dots in aqueous solutions:cooperative effects of pH and electrolytes[J].Environ Sci Technol,2017,51(3):1364-1376.
[17] Liu Y,Gao B,Qiao Z,et al.Gram-scale synthesis of graphene quantum dots from single carbon atoms growth via energetic material deflagration[J].Chem Mater,2015,27(12):4319-4327.
[18] Li X,Wang X,Zhang L,et al.Chemically derived,ultrasmooth graphene nanoribbon semiconductors[J].Science,2008,319(5867):1229-1232.
[19] Xu H,Xia G,Liu H,et al.Electrochemical activation of commercial polyacrylonitrile-based carbon fiber for the oxygen reduction reaction[J].Phys Chem Chem Phys,2015,17(12):7707-7713.
[20] Pylypenko S,Queen A,Olson T S,et al.Tuning carbon-based fuel cell catalyst support structures via nitrogen functionalization.Ⅰ.investigation of structural and compositional modification of highly oriented pyrolytic graphite model catalyst supports as a function of nitrogen implantation dose[J].J Phys Chem C,2011,115(28):13667-13675.
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