简介：AnovelphotoelectrochemicalbiosensorincorporatingnanosizedCdSsemiconductorcrystalswithenzymetoenhancephotochemicalreactionhasbeeninvestigated.CdSnanoparticlesweresynthe-sizedbyusingdendrimerPAMAMasinnertemplates.TheCdSnanoparticlesandglucoseoxidase(GOD)wereimmobilizedonPtelectrodevialayer-by-layer(LbL)techniquetofabricateabiological-inorganichybridsystem.Underultravioletlight,thephoto-effectoftheCdSnanoparticlesshowedenhancementofthebiosensortodetectglucose.PtnanoparticlesweremixedintotheNafionfilmtoimmobilizetheCdS/enzymecompositesandtoimprovethechargetransferofthehybrid.Experimentalresultsdemon-stratethedesirablecharacteristicsofthisbiosensingsystem,e.g.asensitivityof1.83A/(mMcm2),lowerdetectionlimit(1M),andacceptablereproducibilityandstability.

简介：CdSnanocrystalsofvariousshapesweresynthesizedbyusingcadmiumethyldithiocarbonatio(xanthate)asasingleprecursorundersolvothermalcondition.Thereactiontemperature,cadmiumconcentration,andsolventsdeterminetheCdSmorphology.MultipodalCdSstructuresofdifferentfractionsofallparticleswereobtainedattemperaturesrangingfrom100to180℃withthecorrespondingprecursorconcentrationsinethylenediamine(EDA)solution.Thisapproachisdifferentfromthatreportedintheliterature,whereEDAisregardedasasolventfavorabletotheformationofCdSnanorodsinsteadofpods.UniformCdSmultipodswerepreparedat160℃with1.0gofcadmiumxanthate.TheformationofCdSmultipodsinEDAsolutionmaybeattributedtoasynergisticeffectbetweenthereactiontemperatureandCdconcentration,i.e.,thermodynamicailyandkineticallycontrolledgrowthoftheCdSwurtzite(WZ)andzincblende(ZB)phases,asconfirmedbythestructuralcharacterizationofthecomponentCdScrystals.EDAandxanthateligandsactasco-assistedcappingagentsinthegrowthofCdSmultipods.WhenusingN,N-dimethylformamide(DMF)andethyleneglycol(EG)assolvents,theCdSappearsastriangularparticlesandflower-likemicrospheresassembledbypolyhedrons,respectively.