Small 2010 band gap open by water

《Small 2010 band gap open by water》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、GrapheneTunableBandgapinGraphenebytheControlledAdsorptionofWaterMoleculesFazelYavari,ChristoKritzinger,ChuramaniGaire,LiSong,HemtejGullapalli,TheodorianBorca-Tasciuc,PulickelM.Ajayan,andNikhilKoratkar*Graphene,asingle-atom-thicklayerofsp2-hybridizedcarbonedgedisorder,suchasvariableedgeroughne

2、ss,wasproposedatoms,hasgeneratedconsiderableexcitementinthescien-asthemechanismresponsibleforthebandgapopening.tificcommunityduetoitspeculiarelectronicbandstructure,InthisCommunication,wereportafaciletechniquetowhichleadstounusualphenomenasuchastheanomalousopenabandgapingraphenebasedonwaterads

3、orptiontoquantumHalleffect,[1,2]spin-resolvedquantuminterfer-thegraphenesurface.Anenvironmentalchamberwithpre-ence,[3]ballisticelectrontransport,[4]andbipolarsupercur-cisecontroloftheabsolutehumiditylevelisusedtocon-rent.[5]However,pristinegrapheneisasemimetalwithzerotroltheamountofwateradsor

4、bedtothegraphenesurface.bandgap;thelocaldensityofstatesattheFermileveliszeroAbandgapof≈0.206eVcanbeopenedbysimplyexposingandconductioncanonlyoccurbythethermalexcitationofthesampletoanabsolutehumiditylevelof≈0.31kgkg−1electrons.[2]Thislackofanelectronicbandgapisthemajor(i.e.,0.31kgofwaterper1k

5、gofdryair)inanenvironmentalobstaclelimitingtheutilizationofgrapheneinnano-elec-chamber.Theeffectisreversibleandthebandgapreducestotronicand-photonicdevices,[6,7]suchasp–njunctions,tran-≈0.029eVinvacuum.Thistechniquedoesnotrequireanysistors,photodiodes,andlasers.complicatedengineeringormodifica

6、tionofthegrapheneThegraphenebandstructureissensitivetolatticesym-surfaceanddoesnotrelyonchemicaldopingordefectgen-metryandseveralmethodshavebeendevelopedtobreakeration.Itshouldbenotedthathumiditycanbepreciselythissymmetryandopenanenergygap.Thesemethodsarecontrolledonlyinaconfinedspaceandthisha

7、simportantbasedonavarietyoftechniques,suchasdefectgeneration,[8]implicationsfordeviceimplementation.However,withrapiddoping(e.g.,withpotassium[9]),appliedbias,[10–12]andinterac-advancesinmicropackagingofmicro-electromechanicaltionwithgases[13