graphene-based thermal interface materials

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1、Graphene-basedThermalInterfaceMaterials(TIM)AproposalsubmittedtoCTRC(CoolingTechnologiesResearchCenter)Principleinvestigators:YongP.Chen(Physics,ECEandBirckNanotechnologyCenter)XiulinRuan(ME)TimSFisher(MEandBirckNanotechnologyCenter)PurdueUniversityWh

2、yGraphene(discovered2004)cabGraphene:extraordinarythermalconductivity~3000-5000W/mK[NanoLett.8,902–907,2008](highestamongmaterials–responsibleforthehighthermalconductivityofgraphite(ab-plane)andCNT!Graphene:buildingblockformostcarbonmaterials---incl.gr

3、aphiteandcarbonnanotubes(CNT)Recently,carbonmaterials(incl.bothgraphiteandCNT)investigatedasattractivethermalinterfacematerial(TIM)motivatedbytheirhighthermalconductivityOtheradvantagesofgraphene:Highpackingdensity[dueto2D]richshapes/geometryEasilyfunc

4、tionalizedPossibilitiestobondtosurfaceResearchObjectivesDevelophighperformanceTIMbasedongrapheneApproach1(focus):Verticallygrown(CVD)graphenesheetsbetween(andbondedto)substratesApproach2(reference):Graphitemicroplatelets/powderbetweensubstratesComponen

5、ts:material(TIM)designsynthesis/fabricationthermalmeasurementsmodelingSomekeyissues:-Bondingoffillermaterial(graphene)tosurface-AdhesionbetweenfillermaterialsMetricstoAchieve:Materialthermalconductivity>1000W/mKInterfacethermalresistance<1mm2K/WApproac

6、h1:VerticallyGrownGrapheneSheetsbyCVDMalesevicetal.,Nanotechnology’2008substratesubstrateGasprecursor(eg.CH4)CarbondepositionChemicalReactiononsurfaceCarbonPECVDapparatusavailableinPurdue/Birck(Fisher)Microwaveplasmaenhanced(PE)chemicalvapordeposition(

7、CVD)growsverticallyalignedgraphenesheetsNocatalystneededWorksonalmostanysubstrategraphenebondedtosubstratesurfacecanhaveveryhighfilling/packingdensityKeyidea:CVDgrowverticalgraphenebetweentwosubstratesasTIMsubstratesubstrateinterfacegrapheneApproach2:G

8、raphitePlatelets,PowdersandGrapheneCompositescutabcbcaGraphiteab-planehasextraordinarythermalconductivity(duetographenethermalconductivity)Makegraphite(highlyorderedpyrolyticgraphite)plateletswiththin(vertical)dimensionalongabFillsuchgr