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1、CadmiumZincTelluride(CZT)nanowiresensorsfordetectionoflowenergygamma-raydetectionT.Gandhi,K.S.Raja,M.Misra*ChemicalandMetallurgicalEngineeringUniversityofNevada,RenoNV-89557,USA*CorrespondingauthorFax:+17753275059E-mail:Misra@unr.eduAbstract:Bulksinglecrysta
2、lsofCdZnTecompoundsemiconductorisusedforroomtemperatureradiationdetectionincommercialradiationsensors.Alargevolumeofdetectormaterialwithlowdefectdensityisrequiredforincreasingthedetectionefficiency.Manufactureofsuchabulkydetector-qualitymaterialwithlowdefect
3、densityisexpensive.Inthiscommunication,synthesisofnanowiresarraysofCdZnTethatcanbeusedfordetectinglowenergyradiationisreportedforthefirsttime.CdZnTeternarycompoundsemiconductor,referredasCZT,waselectrodepositedintheformofnanowiresontoaTiO2nanotubulartemplate
4、innon-aqueouselectrolytesusingapulse-reverseprocessat10130ºC.VeryhighelectricalresistivityoftheCZTnanowires(intheorderof10Ω-cm)wasobtained.Suchahighresistivitywasattributedtothepresenceofdeepdefectstatessuchascadmiumvacanciescreatedbytheanodiccycleofthepulse
5、-reverseelectrodepositionprocess.StacksofseriesconnectedCZTnanowirearrayswereimpressedwithdifferentbiaspotentials.TheleakagecurrentwasintheorderoftensofPicoAmperes.Whenexposedtoaradiationsource(Am-241,60keV),thecurrentflowinthecircuitincreased.Thepreliminary
6、resultsindicatethattheCZTnanowirearrayscanbeusedasradiationdetectormaterialsatroomtemperaturewithamuchlowbiaspotential(0.7–2.3V)asagainst300–500Vappliedtothebulkdetectormaterials.IntroductionTheabilitytodetecthighenergyradiationsuchasX-rays,gamma-rays,andoth
7、erchargedparticleshasimproveddramaticallyinrecentyears.RadiationdetectorshavebecomeincreasinglyimportantforthelongtermmonitoringofnuclearwastestorageMicro(MEMS)andNanotechnologiesforSpace,Defense,andSecurityIIeditedbyThomasGeorge,ZhongyangCheng,Proc.ofSPIEVo
8、l.6959,695904,(2008)0277-786X/08/$18·doi:10.1117/12.771310Proc.ofSPIEVol.6959695904-1sites,environmentalsafety,andhomelandsecurityagainstterroristthreats.Therearethreetypesofdetectors:1)GasFille
