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1、PERGAMONCarbon39(2001)279±285ReviewElectromagneticinterferenceshieldingeffectivenessofcarbonmaterialsD.D.L.Chung*CompositeMaterialsResearchLaboratory,StateUniversityofNewYorkatBuffalo,Buffalo,NY14260-4400,USAReceived23March2000;accepted22July2000AbstractCarbonmaterialsforelec

2、tromagneticinterference(EMI)shieldingarereviewed.Theyincludecompositematerials,colloidalgraphiteandˉexiblegraphite.Carbon?lamentsofsubmicrondiameterareeffectiveforuseincompositematerials,especiallyafterelectroplatingwithnickel.FlexiblegraphiteisattractiveforEMIgaskets.ó2001El

3、sevierScienceLtd.Allrightsreserved.Keywords:A.Carboncomposites,Carbon?bers,Carbon?laments,Exfoliatedgraphite;D.Electricalproperties1.Introductionincludingnon-structuralandstructuralcomposites,colloi-dalgraphite,aswellasEMIgasketmaterials.Electromagneticinterference(EMI)shield

4、ingreferstothereˉectionand/oradsorptionofelectromagneticradia-tionbyamaterial,whichtherebyactsasashieldagainst2.Mechanismsofshieldingthepenetrationoftheradiationthroughtheshield.Aselectromagneticradiation,particularlythatathighfre-TheprimarymechanismofEMIshieldingisusuallyque

5、ncies(e.g.radiowaves,suchasthoseemanatingfromreˉection.Forreˉectionoftheradiationbytheshield,thecellularphones)tendtointerferewithelectronics(e.g.shieldmusthavemobilechargecarriers(electronsorcomputers),EMIshieldingofbothelectronicsandradia-holes)whichinteractwiththeelectroma

6、gnetic?eldsinthetionsourceisneededandisincreasinglyrequiredbyradiation.Asaresult,theshieldtendstobeelectricallygovernmentsaroundtheworld.TheimportanceofEMIconducting,althoughahighconductivityisnotrequired.shieldingrelatestothehighdemandoftoday'ssocietyonForexample,avolumeresi

7、stivityoftheorderof1Vcmisthereliabilityofelectronicsandtherapidgrowthofradiotypicallysuf?cient.However,electricalconductivityisnotfrequencyradiationsources[1±9].thescienti?ccriterionforshielding,asconductionrequiresEMIshieldingistobedistinguishedfrommagneticconnectivityinthec

8、onductionpath(percolationincaseofshielding,whichreferstotheshielding