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1、BULLETINInvestigationoncompositeAu/T~O~nanoparticles(1)-SynthesisandcharacterizationWANGChuanyi,LIUChunyanandSHENTaoInstituteofPhotograph~cChemistry,ChineseAcademyofSciences,Beijing100101,ChinaAbst~dctNaionietersizcdAu/Ti()zparticlesweresynthesizedbyirradiatio
2、nofaHAuChsolutioncontainingcolloidalTi%withlightofwavelength(A)>330nm.'I'lieabsorptionmaximumattributedtothesurfaceplasmonbandofgoldwasobservedat540nm,aredshiftofabout20nrnfromthrpositioninaqueoussolution.TheAuclustersaresituatedonthesurfaceofTiQintwnsofmicroc
3、rystallite,whichwasconfirmedbyHRTEM,EDSmdXRI).Theelectronicinterfactionbetweenthemetalandthesuprtwasdiscussed.Keywords:photocatalyticreduction,compositeAu/TiOznanoparticles,surfaceplasmonband.INthepastdecades,muchmoreInteresthasbeenshownintheresearchfieldofnan
4、ometer-sizedmetalandsemiconductorparticles.Theseultrafineparticlesexhibitnovelpropertiesverydifferentfromthebulkproperties,suchasuniquecatalyticbehavior,sizequantizationeffects,nonlinearopticalpropertiesandunusualluminescence'".Recently,coupledparticlesareexte
5、nsivelyinvestigatedinviewofimprovingthepropertiesofthenanostructurematerials.However,lessattentionhasbeengiventothecoupledsystemofmetal-semiconductorcomparedwiththatofmetal-metalandsemiconductor-semiconductor[21.Someworkhasbeencarriedoutoncompositemetal-semico
6、nductorparticlessincethephenomenonoftheso-calledstrongmetal-supportinteraction(SMSI)wasfirstfoundbyTausteretaL.13].ThesystemofM/Ti02,suchasv/T~o~'~',P~/T~O,'~'and~i/Ti0~["isbyfarthemostextensivelyinvestigatedcatalyticsys-tem,inwhichthesupportofTi&isbulkmateria
7、l.Inthepresentwork,thesynthesisofAu/Ti02innanometer-sizedscalewasreportedforthefirsttime,andthepreparedparticleswerecharacterizedbyatransmissionelectronmicroscope(TEM)1Experimental(1)Materials.'l'etrachloroauric(111)acid(HAuC14-4H20)andtitanium-tetraisopropoxi
8、de(Ti(O-i-C3H,)4)werepurchasedfromAldrich.Alltheotherchemicalsusedintheexperimentswereanalyticalgradereagents,andthedoublydistilleddeionizedwaterwasusedforsolutionpreparation.Collo
