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时间:2020-03-26
《反应性模板法合成硫化银中空球-银纳米粒子异质结构.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学~(WuliHuaxueXuebao)OctoberActaPhys.一Ch{m.Sin.2012,28lo),2487-24922487[Article]doi:10.3866/PKU.WHXB201209031www.whxb.pku.edu.cn反应性模板成硫化银中空球.银纳米粒子异质结构高继宁赵华博齐利民(北京大学化学与分子工程学院,分子动态与稳态结构国家重点实验室,北京分子科学国家实验室,北京100871)△去、、口.,摘要:以CuS中空球为反应性模板,通过在水溶液中与银离子的阳离子交换和氧化还原反应制备了大小均匀的Ag2S中空球-Ag纳
2、米粒子异质结构,即AgS-Ag异质中空球.该异质结构中每个Ag2S中空球的直径约为600nm,壁厚约20-30nm,其表面均附着一个Ag纳米粒子.采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)~I能量色散X射线谱(EDS)对所得AgS.Ag异质中空球的结构和组成进行了表征.若以CuS中空球为反应性模板,在相似转化条件下则主要得到不含Ag粒子的AgS中空球.该结果表明,CuS中的Cu0)的还原性在AgzS-Ag异质中空球的形成中发挥了重要作用.通过对所制备的AgS.Ag异质中空球进行二次生长,还可以得到AgS中空球的半球表面均被A
3、g膜所包覆的AgS-Ag异质中空球.关键词:硫化银:中窄球;银纳米粒子;异质结构:反应性模板:化学转化:硫化亚铜中图分类号:0648SynthesisofSilverSulfideHollowSphereliverNanoparticleHeterostructuresBasedonReactiveTemplatesGAOJi—NingZHAOHua—BoQILi—Min(BeijingNationalLaboratoryforMolecularSciences.StateKeyLaboratoryfo,StructuralChemistryofUnstab
4、leandStableSpecies,CollegeoyChemistryandMolecularEngineering,PekingUniversity,Bering100871,R.China)Abstract:Silversulfidehollowsphere-silvernanoparticleheterostructureswerepreparedbythesimultaneouscationexchangeandoxidation—reductionreactionsofCu2ShollowsphereswithAgionsinaqueousso
5、lution.TheobtainedAg2S-AghybridhollowspheresconsistedofAg2Shollowspheresabout600nmindiameterand20-30nminthicknesswithasingleAgnanopa~icleattachedtotheoutersurfaceofeachAg2Shollowsphere.Theproductswerecharacterizedbyscanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM)
6、,X-raydifraction(XRD),andenergydispersiveX-rayspectroscopyfEDS).WhenCUShollowsphereswereusedasthereactivetemplateinsteadofCU2Shollowspheres,Ag2Shollowsphereswerethepredominantproductundersimilarreactionconditions.jndicatingthattheCu(I)intheCu2Shollowspheressewedasareductantforreduc
7、ingAgiORStometallicAg,andhenceplayedakeyroleintheformationoftheAg2S—Aghybridhollowspheres.Furthermore.seconda~depositionofAgontheAgeS-AghybridhollowspheresresultedintheformationoflargerAg2S-AghybridhollowspheresconsistingofAg2ShollowsphereswitharoundahalfofthesurfacecoatedbyaAgf¨m.
8、KeyWords:Silversulfide;Hol
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