Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles

Reaction-Driven Restructuring of Rh-Pd and Pt-Pd Core-Shell Nanoparticles

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1、REPORTSincreaseasR4.Figure4Bshowsdataconsistentseveralotherwaysbywhichenergyisdissipated:12.P.Guyot-Sionnest,M.Shim,C.Matranga,M.Hines,withthispredictedscaling.Theslowtimecon-viacouplingtoholes,intermediatetrapstates,andPhys.Rev.B60,R2181(1999).13.V.I.Klim

2、ov,A.A.Mikhailovsky,D.W.McBranch,stantincreasesfrom~10psto~1.7nsforsamplesmolecularvibrations.ThecoolingtimecouldbeC.A.Leatherdale,M.G.Bawendi,Phys.Rev.B61,withsimilarintrabandenergy(keptwithin27±tunedfromlessthan6pstolongerthan1nswithR13349(2000).3meVfora

3、llthesamples)butwithshellthick-identicalcoresanddifferentshellcompositions14.P.Guyot-Sionnest,B.Wehrenberg,D.Yu,J.Chem.Phys.nessincreasingfrom0to~3.5nm.Finally,theandthicknesses.ForemittingordetectingIRra-123,074709(2005).15.D.F.Schroeter,D.J.Griffiths,P.C

4、.Sercel,Phys.Rev.Babsolutemagnitudesoflifetimesalsoagreewithdiation,theincreaseincoolingtimebythreeor-54,1486(1996).predictionsfromtheequation.Usingp=0.3eR0dersofmagnitudeopenstheprospectofusingthe16.P.C.Sercel,Phys.Rev.B51,14532(1995).−182(whereR0isthecor

5、eradius)ands~2.10cm,intrabandtransitionsofcolloidaldots.Proposals17.Y.Toda,O.Moriwaki,M.Nishioka,Y.Arakawa,Phys.Rev.measuredinthe0.28-eVregionforthiol-passivatedtoattempttoextracttheenergyofhotcarriersfromLett.82,4114(1999).18.Y.A.Yang,H.M.Wu,K.R.Williams,

6、Y.C.Cao,CdSeQDswithR=R0=2.25nm,yieldsTnr~23ps.quantumdotstoimprovephotovoltaicyieldareAngew.Chem.Int.Ed.44,6712(2005).Ashell3.25nmthick,foratotalradiusof5.5nm,alsobettervalidated.19.A.Pandey,P.Guyot-Sionnest,J.Chem.Phys.127,wouldgiveTnr~1ps,inagreementwith

7、thedata104710(2007).inFig.3B.Thus,itislikelythatthevibrationalReferencesandNotes20.P.Reiss,J.Bleuse,A.Pron,NanoLett.2,781(2002).couplingmechanismisnowdominatingandthat1.X.Michaletetal.,Science307,538(2005).21.SeesupportingmaterialonScienceOnline.2.V.I.Klim

8、ov,D.W.McBranch,Phys.Rev.Lett.80,402822.S.Sauvageetal.,Phys.Rev.Lett.88,177402(2002).evenlongerlifetimeswillbeachievedbyusing(1998).23.O.Verzelen,G.Bastard,R.Ferreira,Phys.Rev.B66,ligandswithlowerIRactivity,m

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