A carbon nanotube film as a radio frequency filter

Carbon43(2005)

1815–1819

doc.xuehai.net

Acarbonnanotube lmasaradiofrequency lter

NinaA.Prokudinaa,1,EvgeniiR.Shishchenkoa,2,Oh-ShimJooa,

Kyung-HeeHyungb,Sung-HwanHanb,*

a

Eco-nanoResearchCenter,KoreaInstituteofScienceandTechnology,CheongRyang,P.O.Box131,Seoul130-650,RepublicofKorea

b

DepartmentofChemistry,HanyangUniversity,Seoul133-791,RepublicofKorea

Received25March2004;accepted4February2005

Availableonline2April2005

Abstract

Thispaperproposesanewconceptfortheapplicationofcarbonnanotubestoelectronicdevices.Acarbonnanotube(150–200nmwidth,fewlmlength) lmgrownonametalsensitizedquartzsurfacewasmodeledusingatwo-polelumpedelementequivalentcircuitconsistingofacapacitor,aninductor,andtworesistors.Thecapacitorwasinserieswiththeinductorresultinginband-stop ltercharacteristicswithacentralfrequencyof18MHz.Thereactivesubcircuitwasinparallelwithoneresistorandinserieswiththeother.Themagnitudeoftheparallelresistancehadalargein uenceonthee ciencyofthereactiveelementsandthe lterqualityfactor.Atwo-dimensionalcarbonnanotube lmisexpectedtobesuitableinthedesignofminiaturizedRF lters.Ó2005ElsevierLtd.Allrightsreserved.

Keywords:Carbonnanotubes;Chemicalvapordeposition;Electrical(electronic)properties

1.Introduction

Theconstructionofnanoscaleelectronicdevicesusingcarbonnanotubeshasbecomeanimportantre-searchareaintotheapplicationsofthemanyelectronicpropertiesofcarbonnanotubes,whichrangefrommetallictosemiconducting[1–8].However,theelec-tronicandelectricalpropertiesofcollimatedcarbonnanotubesareunclear,particularlyinthehigh-fre-quencyregions.Recently,wereportedtheexistenceofinductanceincarbonnanotubes,andthediscoveryofcarbonnanotubeLCRcircuitsonnickel-sensitizedpor-ousaluminabeadsinthehigh-frequencyregion[9].Car-bonnanotubesgrownonanaluminasurfaceactasaninductor,whichgenerateamagnetic eldunderahigh

Correspondingauthor.Tel.:+82222200934;fax:+82222990762.E-mailaddress:shhan@hanyang.ac.kr(S.-H.Han).1

OnleavefromBoreskovInstituteofCatalysis,Novosibirsk,Russia.2

OnleavefromCenterofInstrumentMetrology,Novosibirsk,

Russia.

0008-6223/$-seefrontmatterÓ2005ElsevierLtd.Allrightsreserved.doi:10.1016/j.carbon.2005.02.012

*

alternatingcurrent(AC)frequencyandarecapableofstoringanelectricalcharge[10–12].Muyamotoetal.theoreticallyinvestigatedthechiralconductivityofindi-vidualnanotubesanddiscussedthestrengthofthein-ducedmagnetic eld[10].InadditionWattsetal.reportedthee ectsofmetallicparticlesonnano-electro-magneticinductorbasedonthecarbonnanotubes.However,theycouldnotevaluatetheinductanceofthecomposite lms[11].Basedonpreviouswork,car-bonnanotubeshavethedualreactivenature(capaci-tor–inductor)withresistances,whichcane ectivelyconstructRLCcircuitsinthehigh-frequencyregion.Thispaperextendsthisworktotheconstructionofaloadedband-stop lter(a lterrejectingtheselectedfre-quencieswithacentralonea ectedbythecapacitance,andinductance,andaworkingfrequencieszonea ectedbyresistance)consistingofacarbonnanotube(150–200nmwidth,fewlmlength) lmonaquartzsurface(25·5mm).

PassiveLCR ltersarestillusedextensivelyinspe-cializedapplicationse.g.whereawidedynamicrange

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