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简介：ThemonolayerdispersionofcopperoxideonthesurfaceofanataseanditseffectonthepropertieshavebeenstudiedbyX-rayphotoelectronspectroscopy(XPS)andX-rayextendedabsorptionfinestructure(EXAFS).XPSresultsgiveanutmostdispersioncapacityof7.2mg/gTiO2.StronginteractionsbetweencopperoxideandanatasecanbeseenfromEXAFSresults.ThestructureofthesupportedCuOspeciesisstronglydependentontheamountofCuOloading.WhenthecontentofCuOloadingisbelowtheutmostdispersioncapacity,thesurfaceofCuO/TiO2isdominatedbythehighlydispersedCuOspecieshavingno-Cu-O-Cu-chains,Thecopperionislocatedinanoctahedralcoordinationenvironment,andtheCu－O-coordinationdistanceismuchlongerthanthatinpurecrystallineCuO,whenCuOloadingisexceedstheutmostdispersioncapacity,crystallineCuOisformedonthesurfaceofCuO/TiO2,Fromtheresultofthesturcturestudy,itisCu-OoctahedralCoordinationandcoordinationdistancechangeincomparationwithpurecrystallineCuoonthesurfaceCuO/TiO2thathavecatalyticactivity.

简介：Probingtheopticalpropertiesofmolybdenumdisulfide（MoS2）isvitaltoitsapplicationinplasmon-enhancedspectroscopy,catalysts,sensing,andoptoelectronicdevices.Inthispaper,wetheoreticallystudiedtheRamanandfluorescencepropertiesofmonolayerMoS2usingtip-enhancedspectroscopy（TES）.Inthestrong-couplingTESsystem,theRamanandfluorescenceenhancementfactorscanbeturnedtoashighas4.5×108and3.3×103,respectively,byoptimizingthetip–MoS2-filmdistance.OurtheoreticalresultsnotonlyhelptodeeplyunderstandtheTESpropertiesofmonolayerMoS2,butalsoprovidebetterguidanceontheapplicationsofthenoveltwo-dimensionalmaterial.

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简介：Ingraphene,conductanceelectronsbehaveasmasslessrelativisticparticlesandobeyananalogueoftheDiracequationintwodimensionswithachiralnature.Forthisreason,theboundingofelectronsingrapheneintheformofgeometriesofquantumdotsisimpossible.Ingaplessgraphene,duetoitsuniqueelectronicbandstructure,thereisaminimalconductivityatDiracpoints,thatis,inthelimitofzerodoping.Thiscreatesaproblemforusingsuchahighlymotivatednewmaterialinelectronicdevices.Oneofthewaystoovercomethisproblemisthecreationofabandgapinthegraphenebandstructure,whichismadebyinversionsymmetrybreaking(symmetryofsublattices).WeinvestigatetheconfinedstatesofthemasslessDiracfermionsinanimpuredgraphenebytheshort-rangeperturbationsfor"localchemicalpotential"and"localgap".Thecalculatedenergyspectrumexhibitsquitedifferentfeatureswithandwithouttheperturbations.Acharacteristicequationforboundstates(BSs)hasbeenobtained.Itissurprisinglyfoundthattherelationbetweentheradialfunctionsofsublatticeswavefunctions,i.e.,f_m~+(r),g_m~+(r),andf_m~-(r),g_m~-(r),canbeestablishedbySO(2)group.

简介：Itiswellknownthatelectrochemicaloxidationofanilinedissolvedinelectrolytesolutionsisaveryusefulmethodforpreparingpolyanilinefilmsonelectrodes’.However,itisverydifficultforthismethodtoprepareauniformmonolayerpolymersincelocalnucleationandgrowthofpolyme...

简介：Mercaptopropyltrimethoxysilane(MPTS)bearingmercaptogroupswasusedtoformself-assemblymonolayers(SAMs)onglasssubstratesbysolutionextraction.SEM,XRDandrubbingtestanalysisillustratedthattheAgfilmontheSAMs-modifiedglasswasmoredurablethanthatonthecommonly-modifiedglassandthatthecrystallinityofAgfilmontheSAMs-modifiedglasswasidenticalwiththoseoftheAgfilmonthecommonly-modifiedglassandpureAg.

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简介：Insituphotochromicprocessinthemonolayerofaphotochromicspiropyranderivativewithoutlongalkylchain,wasinvestigated.Thephotochromismattheair/waterinterfaceunderdiffernetsurfacepressureswasstudiedbysurfacepressure-areaisotherms,surfacepressure-timecurves,area-timecurvesandBrewsteranglemicroscopy.Bothformsofthecompoundwerefoundtoformmonolayersattheair/waterinterfacealthouhgitdoesnothavelongalkylchain.Alargeareaexpansioninthemonolayercorrespondingtoazreo^thorderreactionwasfoundattheinitialstageoftheUVlightirradiation.Aseriesofdynamicinvestigationsrevealedthatathighpressureafterphasetransitioninthemonolayer,thesurfacepressurechangesgreatlyumderalternativeirradiationofUVandvisiblelight.Anobviousmorphologicalchangeaccompanyingwiththephotochromismwasobservedinsitu.

简介：Entangledphotonsarethefundamentalresourceinquantuminformationprocessing.Howtoproducethemefficientlyhasalwaysbeenamatterofconcern.HereweproposeanewwaytoproducecorrelatedphotonsefficientlyfrommonolayerWS2basedonboundstatesinthecontinuum(BICs).TheBICsofradiationmodesinthemonolayerWS2arerealizedbydesigningthephotoniccrystalslab-WS2-slabstructure.Thegenerationefficiencyofcorrelatedphotonpairsfromsuchastructurehasbeenstudiedbyusingarigorousquantummodelofspontaneousparametricdown-conversionwiththeplanewaveexpansionmethod.ItisfoundthatthegenerationefficiencyofcorrelatedphotonpairsisgreatlyimprovedifthesignalandidlerfieldsarelocatedattheBICsdeterminedbytheinversescatteringmatrixofthestructure.Thisisincontrasttotheparametricdown-conversionprocessfortheenhancedgenerationofnonlinearwavesifthepumpfieldislocatedattheBICsdeterminedbythescatteringmatrixofthestructure.Thegenerationrateofthecorrelatedphotonpairscanbeimprovedby7ordersofmagnitudeinsomedesignedstructures.Thegeneratedquantumsignalsaresensitivetothewavelengthandexhibitnarrowedrelativelinewidth,whichisverybeneficialforquantuminformationprocessing.

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简介：Aself-assembledmonolayerfilm(SAM)ofrutheniumphthalocyanine(RuPc)fabricatedonasilversubstratepremodifiedwithanSAMofterephthalonitrile(TPN)wasstudiedbymeansofsurface-enhancedRamanscattering(SERS)andultraviolet-visible(UV-Vis)spectroscopies.TPNwasusedasaligandtolinkRuPcsinceitcannotonlymodifythesilversubstratebutalsodeliverthenitrilegroupsprotrudingfromthesilversurface.Therefore,wecanexploretherelationshipbetweenthestructureandtheorientationofRuPcandtheTPN-modifiedsubstrate.TheUV-VisspectraindicateastronginteractionbetweenRuPcandTPNinthecompositefilm.TheresultisfurtherconfirmedbytheSERSspectraofRuPc-TPNSAM,inwhichthevibrationalbandsarisingfromboththeRuPcandTPNmoietiesappearclearly,indicatingthattheRuPcissuccessfullyassembledontheTPNfilm.

简介：Thefundamentalmomentumconservationrequirementq~0fortheRamanprocessisrelaxedinthenanocrystallites(NCs),andphononsawayfromtheBrillouin-zonecenterwillbeinvolvedintheRamanscattering,whichiswell-knownasthephononconfinementeffectinNCs.ThisusuallygivesadownshiftandasymmetricbroadeningoftheRamanpeakinvariousNCs.Recently,theA'_1modeof1LMoS2NCsisfoundtoexhibitablueshiftandasymmetricbroadeningtowardthehigh-frequencyside[Chem.Soc.Rev.44(2015)2757andPhys.Rev.B91(2015)195411].Inthiswork,wecarefullycheckthisissuebystudyingRamanspectraof1LMoS2NCspreparedbytheionimplantationtechniqueinawiderangeofion-implanteddosage.ThesameconfinementcoefficientisusedforbothE'andA'_1modesin1LMoS_2NCssincethephononuncertaintyinanNCismainlydeterminedbyitsdomainsize.TheasymmetricalbroadeningneartheA′_1andE′modesisattributedtotheappearanceofdefect-activatedphononsatthezoneedgeandtheintrinsicasymmetricalbroadeningofthetwomodes,wheretheanisotropyofphonondispersioncurvesalongΓ-KandΓ-Misalsoconsidered.Thephotoluminescencespectraconfirmtheformationofsmalldomainsizeof1LMoS_2nanocrystallitesintheion-implanted1LMoS_2.Thisstudyprovidesnotonlyanapproachtoquicklyprobephonondispersiontrendsof2DmaterialsawayfromΓbytheRamanscatteringofthecorrespondingNCs,butalsoareferencetocompletelyunderstandtheconfinementeffectofdifferentmodesinvariousnanomaterials.