%0 Journal Article
%T DependenceofphotocatalyticactivityofZnxCd1-xSquantumdotcomposition
%A Alice Hospodkov¨¢
%A Ladislav Svoboda
%A Petr Praus
%J ´ß»¯Ñ§±¨
%P 328-335
%D 2015
%R 10.1016/S1872-2067(14)60269-2
%X £¿AqueouscolloidaldispersionscontainingZnxCd1-xSquantumdots(QDs)ofdifferentxcompositionswerepreparedbyprecipitatingzincandcadmiumacetateswithsodiumsulphide,inthepresenceofacetyltrimethylammoniumbromidestabilizer.Ultraviolet-visibleabsorptionspectroscopywasusedtodeterminethetransitionenergiesoftheQDs,whichinturnwereusedtocalculatetheirsizes,whichdependedontheircomposition.TheQDsizedecreasedwithincreasingZncontent.ThephotocatalyticactivityoftheZnxCd1-xSQDswasstudiedbythedecompositionofmethyleneblueunderultravioletirradiation,atamaximumintensityat365nm(3.4eV).Threedifferentphotocatalyticactivityregionswereobserved,whichdependedontheZncontent.ThequantumlevelsoftheQDscouldbeexcitedbyincidentirradiation,andinfluencedtheresultingphotocatalyticactivity.Maximumphotocatalyticactivitywasachievedatx=0.6,wheretheQDtransitionenergywasequaltotheirradiationphotonenergy.ThephotocatalyticefficiencyoftheQDsdependedontheirsurfaceareaandarrangementofquantumlevels,becauseofthequantumsizeeffect.
%K Quantumdot
%K ZnxCd1-xS
%K Photocatalysis
%K Quantumlevel
%U http://www.chxb.cn/CN/abstract/abstract21532.shtml