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ScientificLiteratureReadings Name StudentID 15S008154Winter2015SchoolofMechatronicsEngineering 1 ScientificLiteratureReadings TribologyofGraphene AReview Authors OleksiyPenkov Hae JinKim Hyun JonKim Dae EunKim 2 ScientificLiteratureReadings Abstract Graphenehasreceivedsignificantattentionduetoitscombinationofremarkablemechanical thermal chemicalandelectricalproperties Furthermore duetoitssuperiorstrength graphenehasgreatpotentialforuseasanultra thinprotectivecoatingforvariousprecisioncomponents Inthispaper thelatestdevelopmentsintribologicalapplicationsofgraphene theoreticalsimulationsofgraphenefrictionandpreparationmethodsarereviewed Itisshownthatvariousgraphenecoatingscanbesuccessfullyusedtodecreasefrictionandwearinnano micro andmacro mechanicalapplications However theconditionsunderwhichgrapheneservesasaneffectiveprotectivecoatingdependsontheoperatingparameters Acomprehensivereviewisprovidedwiththeaimtoassesssuchcharacteristicsofgraphene Background Conclusion 3 ScientificLiteratureReadings Tribologicalbehaviorplaysanimportantroleintheperformanceofultra precisionmechanicalsystems ABriefReviewofTribology 4 ScientificLiteratureReadings ABriefReviewofTribology Andthewearresistancedeterminesthemechanicalandcommercialviabilityofthedevice 5 ScientificLiteratureReadings However asaresultofsurfacetensioneffects classicalmethodsforreducingfrictionwithlubricatingfluidscannotbeemployedinmicrosystems LimitationsofClassicalMethod 6 ScientificLiteratureReadings Differenttypesofthincoatingssuchassoftmetals organiccompoundssuchasself assembledmonolayers bi layerandmultilayerhardcoatings diamond likecarbonfilmsandnanostructuredcoatingscanbeusedtoreducefrictionandwearinmicro devices Unfortunately despitereportsofnumerousproposedcoatings anoptimummethodforreducingthefrictionandwearofthesedeviceshasnotyetbeenidentified LimitationsofClassicalMethod 7 ScientificLiteratureReadings NewBreakthroughofTribology Thecombinationoftheremarkablemechanical thermal chemicalandelectricalpropertiesofgraphenesheetsandtheirrelativelylowproductioncostdistinguishthemfromothermaterialsusedfornano electromechanicalapplications Thus grapheneisconsideredasapromisingmaterialforfutureapplicationsinnanoelectronicandminiaturizeddevices 8 ScientificLiteratureReadings NewBreakthroughofTribology Furthermore duetoitssuperiorstrength graphenehasgreatpotentialforuseasanultra thinprotectivecoatingforvariousprecisioncomponentsexposedtocontactstress 9 ScientificLiteratureReadings PreparationofGraphene Amongthesetechniques thechemicalvapordeposition CVD growthmethodappearstobethemostpromisingforlarge scaleproductionofmono orfew layergraphenefilms 10 SimulationsandPredictions ScientificLiteratureReadings Thesesimulationstudiesrelatedtothetribologicalcharacteristicsofgraphene frictionwastheprimaryfocus Theinfluenceofvariousparametersonfriction suchasthenumberofgraphenelayers normalforce adhesionforceandslidingvelocity wereinvestigated Thepurposeoftheseworkswastoprovideinsightintothefrictionalmechanismofgraphene andthesimulationscouldsufficientlyreproducetheexperimentallyobservedtrendsofgraphenefrictionalbehavior Moreover severalresultsthatcouldnotbeobservedbyexperimentalmethods suchasthemotionofindividualatoms wereobtainedfromsimulationswhichaidedinincreasingtheunderstandingregardingthefrictionalmechanismofgraphene 11 ScientificLiteratureReadings Conclusions 1 Thekeyfactorsthatwerefoundtoinfluencethefrictionandwearbehaviorsofgraphenewerenumberoflayers depositionmethod andsubstratematerial 2 Despitetheultra thinnatureofgraphenesheets theywereeffectiveinreducingthefrictionandwearnotonlyundermicro scalecontactloadsbutalsoinrelativelyhighloads 3 Furthermore thetypeofsubstrateneededtoproducethetribologicaladvantagesofgraphenewasnotlimitedtoextremelyflatandsmoothsurfaces Graphenewasfoundtobeeffectiveevenonmetallicsubstrateswithtypicalsurfacetopography 12 ScientificLiteratureReadings FutureResearchDirection Withthedevelopmentofmoreefficientgraphenedepositionmethodsoveralargearea theuseofgrapheneintribologicalapplicationsisexpectedtogrowcontinuouslyinthefuture DepositionMethods 13 ScientificLiteratureReadings Relationships Iwilllearnandstudytribologyinthefuture ThepapergivemeaguidelineifIneedseveralspecialsolidlub
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