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1、ShapeandSizeEffectofZnOnanocrystalsonPhotocatalyticActivityAnnaMclaren,TeresaValdes-Solis,GuoqiangLiandShikChiTsang*WolfsonCatalysisCentre,InorganicChemistryLaboratory,UniversityofOxford,Oxford,OX13QRUKE-mailaddressofcorrespondingauthor:Edman.tsang@chem.ox.ac.ukSupportingInformation1.Analytic
2、alTechniques1.1PowderX-RayDiffraction(XRD)X-raydiffractiondatawascollectedusingaPhilipsPW1729diffractometer,operatinginBragg-BrentanofocusinggeometryandusingCuKαradiation(λ=1.5418Å)fromageneratoroperatingat40kVand30mA.Sampleswerepreparedbyplacingadropofnanoparticlesuspensiononaglassslideandal
3、lowingthesolvent,hexane,toevaporate.Thisprocesswasrepeatedmanytimesuntilasmoothlayerofmaterialwasdepositedontheslidesurface.TheScherrerequationwasusedtoestimateaverageparticlesizefromthemeanvaluederivedfromthe(100),(002)and(101)takingtheinstrumentallinebroadeningintoaccount.1.2LowAngleXRDLowa
4、ngleX-raydiffractionwasusedtoobtainthediffractionpatternatlowanglesintherange1-10°2θ.Lowangledatainthisrangecangiveinformationaboutstructuralperiodicitywithd-spacingsofupto90Å.ThelowangleX-raydiffractiondatawascollectedusingaPANalyticX’PertProdiffractometer,alsooperatinginBragg-Brentanofocusi
5、nggeometry.Thesampleswerepreparedinthesamewayasforhigh-angleXRD.1.3TransmissionElectronMicroscopy(TEM)TEMimageswereobtainedusingaJEOL2010microscopewithahighresolutionpolepiece.Thesampleswerepreparedbyplacingadropofnanoparticlesuspensionontoacarbon-coatedcoppergrid,andallowingthesolvent,hexane
6、,toevaporate.1.4SamplePreparationandCatalyticTestingTheprecursorzincacetatedihydrate(1.40g,6.38mmol)wasfirstheatedinanovenat120°Covernighttoremovewater.Inastandardsynthesisthisprecursorwasthenmixedwitholeicacidinadesignatedmolarratio,in15ml(12.00g,33.93mmol)oftrioctylaminesolvent.Themixturewa
7、sheatedundernitrogento290°C.The3-neckedflaskwasattachedtoarefluxcondenser,andthemixturewasmagneticallystirredthroughout.Thesolutionturnedyellowinitially,thenthepresenceofthenanoparticleswasindicatedbythesolutionturningcloudy(within1hourofheat
