Abstract: This paper reports two binary-solvent systems, i.e. dimethylformamide/n-butylalcohol system and dimethylformamide/ethanol system that facilitate higher concentration and improved stability of graphene dispersion. Hydrogen bond was introduced to explain the exfoliation mechanism and stabilizing mechanism. At the same time, it was found that Hansen solubility theory was not suitable for the chosen binary solvent systems. Furthermore, the topography and nanostructure of graphene were characterized by atomic force microscopy (AFM), transmission electron microscopy (TEM) and Raman spectroscopy. The absorbance coefficient of graphene dispersion was obtained by UV-Vis spectra. Finally, a graphene dispersion that predominantly containing single-layer graphene was obtained after 6 000 r/min centrifugation.
Novoselov K S, Geim A K, Morozov S V, et al.Electric field effect in atomically thin carbon films[J]. Science,2004,306(5696):666.
[2]
He Dafang, Wu Jian, Liu Zhanjian, et al.Recent advances in preparation of graphene for applications[J]. J Chem Ind Eng(China), 2015, 66(8):2888 (in Chinese).何大方, 吴健, 刘战剑, 等. 面向应用的石墨烯制备研究进展[J]. 化工学报,2015,66(8):2888.
[3]
Bolotin K I, Sikes K J, et al.Ultrahigh electron mobility in suspended graphene[J]. Solid State Commun,2008,146(9-10):351.
[4]
Balandin A A, Ghosh S, Bao W, et al.Superior thermal conductivity of single-layer graphene[J]. Nano Lett,2008,8(3):902.
[5]
Lee C, Wei X, Kysar J W, et al.Measurement of the elastic properties and intrinsic strength of monolayer graphene[J]. Science,2008,321(5887):385.
[6]
Chae H K, Siberio-Pérez D Y, Kim J, et al. A route to high surface area, porosity and inclusion of large molecules in crystals[J]. Nature,2004,427(6974):523.
[7]
Stoller M D, Park S, Zhu Y, et al.Graphene-based ultracapacitors[J]. Nano Lett,2008,8(10):3498.
[8]
Eda G, Chhowalla M.Graphene-based composite thin films for electronics[J]. Nano Letters,2009,9(2):814.
[9]
Hernandez Y,et al.High-yield production of graphene by liquid-phase exfoliation of graphite[J].Nat Nanotech-nol,2008,3(9):563.
[10]
Matsumoto M, et al.Ultrahigh-throughput exfo-liation of graphite into pristine ‘single-layer' graphene using microwaves and molecularly engineered ionic liquids[J]. Nat Chem,2015,7(9):730.
[11]
Raccichini R, Balducci A, et al. Method of producing graphene by exfoliation of graphite: WO, 2015/131933[P]. 2015-09-11.
[12]
Niazi M B K. Effect of concentration of surfactant on the exfoliation of graphite to graphene in aqueous media[J]. Nanomater Nanotechnol,2016,6(14):1.
[13]
Cui J, Song Z, Xin L, et al.Exfoliation of graphite to few-layer graphene in aqueous media with vinylimidazole-based polymer as high-performance stabilizer[J]. Carbon,2016,99:249.
[14]
Chia J S Y, Tan M T T, et al. A novel one step synthesis of graphene via sonochemical-assisted solvent exfoliation approach for electrochemical sensing application[J]. Chem Eng J,2014,249:270.
[15]
Chen J, et al.A binary solvent system for improved liquid phase exfoliation of pristine graphene materials[J]. Carbon,2015,94:405.
[16]
Posudievsky O Y, Khazieieva O A, et al.High yield of graphene by dispersant-free liquid exfoliation of mechanochemically delaminated graphite[J]. J Nanoparticle Res,2013,15(11):1.
[17]
Hernandez Y, Lotya M, Rickard D, et al.Measurement of multicomponent solubility parameters for graphene facilitates solvent discovery[J]. Langmuir ACS J Surf Colloids, 2010, 26(5):3208.
[18]
Zhou K G, Mao N N, Wang H X, et al.A mixed-solvent strategy for efficient exfoliation of inorganic graphene analogues[J]. Angew Chem,2011,50(46):10839.
[19]
Hansen C M.Hansen solubility parameters: A user's handbook [M]. Boca Raton: CRC Press, 2007:323.
Ferrari A C.Raman spectroscopy of graphene and graphite: Disorder, electron-phonon coupling, doping and nonadiabatic effects[J]. Solid State Commun,2007,143(1-2):47.
[22]
Ferrari A C, Meyer J C, Scardaci V, et al.Raman spectrum of graphene and graphene layers[J]. Phys Rev Lett,2006,97(18):13831.
[23]
Stengl V, Henych J, Ecorchard P, et al.A green method of graphene preparation in an alkaline environment[J]. Ultrasonics Sonochem,2014,24:65.
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2017, Vol. 31 
