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1、AbstractGrapheneisatwo．dimensional(2D)crystalconsistingofasinglelayerofsp"hybridizedcarbonatomsarrangedinsix-memberedrings．Ithasfascinatedthealmostmaterialscientificcommunityduetoitsextraordinarypropertiesandpotentialapplications．Firstly,wehaveexploredtheoptimumconditionsofthesynthesisof
2、few—layeredgraphene．AccordingtothecharacterizationresultsofSEMandXRD，wecanfindthattheefficientexfoliationofthegraphiterequiresahighercurrentdensityinI-12-Hebuffergases．However，whenthearccurrentistoomuchhigh，thesamplesareeasytosinterandagglomerate，andas-obtainedgraphenehavealargethickness
3、andinhomogeneity．Onlywhenthevolumecontentofhydrogenrangesfrom25％to75％incontainingH2buffergases，fewer-layerdgraphenenanosheetswithhighqulityCanbeenachievedbyarcdischargemethod．Inaddition，totalpressurehavelittleeffectonthemorphologyandstructuresofthegrapheneinI-I：。Hebuffergases,onlysomedif
4、ferencesinthesizeofthegraphenenanosheets，andthelesstotalpressure，thesmallersize．Secondly，wehaveinvestigatedtheinfluenceofdifferentbuffergasesonsynthesisofgraphene．Tobeginwith，few—layeredgraphenesheetsweresynthesizedbYdirectcurrentarcdischargeusingdifferentbuffergases．Then，Avarietyofchara
5、cterizationsofthesampleswereconducted，suchasSEM，TEM，AFM，Raman，BETandTGA(thermogravimetricanalysis)et．a(chǎn)1．Moreover,thehydrophobilityandthefieldemissionpropertiesofthesprayed—coatinggraphenefilmspreparedbyadirectsolutionprocesswerestudied．Asaresult，thegenerationofgraphenesheetsshowsstrongde
6、pendenceonthecompositionofbuffergasesandcontainingI-12buffergasesarenecessarytopreparefew—layeredgraphenesheets．ThegraphenesheetsproducedinH2．HebuffergaseshavebettercrystallinityandhigherspecificsurfaceareacomparedwiththoseproducedinotherscontainingHEbuffergases．T11eas．obtainedgraphenesh
7、eetsaremainlynomorethan5layersandtheirlateraldimensionsareabout40．200nm．Thegraphenesheetsshowexcellentthermalstabilityandthereisonlylessthan3wt．％weightlossupto800oCinN2atmosphere．ThegraphenesheetsCanbeeasilydispersedintoethanolandtheas-obtainedsuspensioncanbestableformore
