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1、AbstractCHEMICALSYNTHESISANDFoRⅣ隊TIoNMECHANISMoFGRAPHENENANoSHEETSBYASUBSTRATE．FREESTRATEGYABSTRACTGraphene-atwo—dimensionalcarbonmaterial-hasultrahighelectronperformance(electronmobility，aroom—temperattirefractionalquantumHalleffect)，extraordinarymechanicalproperty(highfracturestrength，
2、modulus)，surfacechemistry(highspecificsurfacearea，lubrication，friction)andgoodbiocompatibility．Grapheneisalsoapromisingmaterialinapplicationssuchasnano-composites，energy—storagematerials(hydrogenstoragematerials)，relatedderivatives，liquidcrystaldevices(transistor)，transducers，analyticals
3、ciencesandbiomedicalsciences．In2004，AndreGeimwhoobtainedsingle-·layergraphenehavebeenmadethetwo--dimensionalmaterialgraphenecometorealityandcaughtSOmuchattentioninscientificresearch．Therearemainlyfourtraditionalmethodstopreparegraphene：micromechanicalexfoliation，reductionofgraphiteoxide，
4、epitaxialgrowthandchemicalvapordeposition。However，thesefourtraditionalpreparationmethodsaredifficultinlargescaledgrapheneproduction．Inthispaper，wereportedanewwaytosynthesisgraphene-asubstrate—freestrategy．Graphenesheetswasproducedbyonlytwomainlyreactants(ferroceneandIII1,2，4一trichloroben
5、zene)withnitrogenprotectionandthechlorinationplaysanincreasingimportantroleinmakingthegraphenesheetsself-assembleonthefewlayersgraphenesheets．Andbychangingtheprocessparameters，suchasreactiontemperature，reactantsratio，reactantsamount，etc)，weexplorethemorphologychangerules，growthmechanism，
6、optimumreactconditionsalsobestudied．Oursynthesishashighproduction，highcontrollabilityandlowcosttopreparegraphene，layingagoodfoundationforresearchanddevelopmentTheresultsshowthatinferrocene／1，2，4一trichlorobenzenesystem，graphenesheetscanbemadebetween400-700℃．Theoptimalproportionofferrocene
7、and1,2，4-trichlorobenzeneratiois1：1and450℃istheperfecttemperature．Underthiscondition，lamelladimensioncanbe2-15pm，singleorseverallayer(1essthan5layers)and40％uptoaproductivityWiththeincreasingoftemperatures，theareaofcarbonsheetsincreasesandself-crimpingdecreasesforthethicke
