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1、CRYSTALGROWTHCopperDendrites:Synthesis,MechanismDiscussion,and&DESIGNApplicationinDeterminationofL-Tyrosine2008XiaojunZhang,*,,GuangfengWang,,§XiaowangLiu,,HuaqiangWu,,andVOL.8,NO.4,§BinFang1430–1434CollegeofChemistryandMaterialsScience,AnhuiNormalUniVersity,Wuhu
2、241000,P.R.China,AnhuiKeyLaboratoryofFunctionalMolecularSolids,AnhuiNormalUniVersity,Wuhu241000,P.R.China,andAnhuiKeyLaboratoryofChem-Biosensing,AnhuiNormalUniVersity,Wuhu241000,P.R.ChinaReceiVedNoVember7,2007;ReVisedManuscriptReceiVedJanuary12,2008ABSTRACT:Highl
3、yuniformcopperdendritesweresuccessfullypreparedinlargequantitiesusingafacilehydrothermalapproach,whichwaspreparedfromthereactionofcupreousnitrateandsodiumhypophosphitewithdifferentratiosofdiethanolamine(DEA)/water.Well-definedassemblyofuniformdendriteswithanaverag
4、esizeof20µmcanbeobtainedafterasimplesize-selectionprocess.TheinfluencesoftheratioofDEA/water,anddifferentreactiontimesandtemperatureshavebeendiscussed.Inaddition,agoldelectrodemodifiedwithcopperdendriteswasconstructedandcharacterizedbyelectrochemicalimpendancespect
5、rum(EIS)andcyclicvoltammetry(CV).TheresultingcopperdendritemodifiedgoldelectrodewasusedtodetectL-tyrosineinthesolution.TheresultsshowedthatthecopperdendritesmaybeofgreatpotentialinthedeterminationofL-tyrosine.IntroductionMetalnanostructureshavebeenwidelyexploitedf
6、oruseinphotography,catalysis,biologicallabeling,photonics,optoelectronics,surface-enhancedRamanscattering(SERS),1andformulationofmagneticferrofluids.Theintrinsicpropertiesofametalnanostructurearedeterminedbyitssize,2shape,morphology,composition,andcrystallinity.To
7、date,muchefforthasbeenmadetodesignnanocrystalswithwell-definedsizes,shapes,andcrystallinity.Quitealotofnanostructures,suchasdiscretecobaltdisks,rods,andcubes,platonicgoldnanocrystalsandothershapes,silverprisms,cubes,rods,andhexagonalplates,havebeensynthesizedvia3e
8、fficientsolution-phasereductionmethods.Self-assembledhierarchicalandrepetitivesuperstructuresarefascinatingFigure1.XRDpatternofthesample.becauseoftheirpromising
