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1、物理化学学报(WuliHuaxueXuebao)JulyActaPhys.鄄Chim.Sin.,2008,24(7):1219-12241219[Article]www.whxb.pku.edu.cn簇形和花形CdS纳米结构的自组装及光催化性能鄢许迪高爱梅邓文礼(华南理工大学材料科学与工程学院,广州510640)摘要:通过可控溶剂热法,利用乙二胺作为模板制备出簇形和花形硫化镉(CdS)纳米结构.通过X射线衍射(XRD)和扫描电镜(SEM)观测其形貌和结构特征.XRD谱线显示,簇形CdS为六方晶体结构,而花形CdS纳米结构则为立方晶体.实验结果表明,整个自组装过程是由成核以及成核竞争
2、引起的不同生长过程所组成的,并且乙二胺的模板功能起了重要的作用.通过不同时间和温度的实验,深入探讨了簇形和花形CdS纳米结构的自组装机理.室温光致发光谱(PL)显示这两种纳米结构在433nm和565nm附近有较强的发射峰,分别对应激子发射和表面缺陷发光.通过Brunauer鄄Emmett鄄Teller(BET)方法测试其比表面积.研究了高压汞灯照射下,簇形和花形CdS纳米结构在甲基橙(MeO)溶液中的光催化性能.结果显示,由于其较大的比表面积,花形CdS纳米结构的光催化性能要远优于其它CdS材料.关键词:硫化镉;纳米棒簇;花形纳米结构;自组装;光催化中图分类号:O649;O643S
3、elf鄄AssemblyandPhotocatalyticPropertiesofClusteredandFlowerlikeCdSNanostructures鄢XUDiGAOAi鄄MeiDENGWen鄄Li(CollegeofMaterialsScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,P.R.China)Abstract:ClusteredandflowerlikeCdSnanostructuresweresynthesizedviathecontrollablesolventth
4、ermalmethodusingethylenediamineasthestructure鄄directingtemplate.ThephasestructuresandmorphologiesweremeasuredbyX鄄raydiffraction(XRD)andscanningelectronmicroscopy(SEM).XRDpatternsdemonstratedthattheCdSnanorodclustersamplewashexagonalcellandtheflowerlikeCdSnanostructurewascubiccell.Experimentalr
5、esultsshowedthatthewholeself鄄assemblyprocesswasmade鄄upofnucleationandgrowth,whichwasduetothecompetitioninthenucleation.Andthetemplatefunctionofethylenediamineplayedanimportantroleintheself鄄assembly.Theself鄄assemblymechanismsofformingtheclusteredandflowerlikenanostructureswereinvestigatedontheb
6、asisofthetime鄄andtemperature鄄dependentexperimentsandwerebrieflydiscussed.Atroomtemperature,photoluminescence(PL)spectrumexperimentsrevealedthatCdSnanostructureshadtwovisibleemissionpeaksrespectivelyatthewavelengthsof433nmandnearly565nm,whichshouldariserespectivelyfromtheexcitonicemissionandsur
7、face鄄defect.ThespecificsurfaceareaswerecharacterizedbytheBrunauer鄄Emmett鄄Teller(BET)method.ThephotocatalysisofclusteredandflowerlikeCdSnanostructuresinmethylorange(MeO)underhigh鄄pressuremercurylampilluminationwasinvestigated.Theexperime