液体中激光烧蚀法制备纳米材料课件.ppt

1、Group members：Ou Qian,Chao Zhang,Dan Jia,Yanping Su,Lulu Wen,Gangfeng Wei,Yongkui Wang,Dongfang Wang,Xiangyang Song,Wen Wang,Haiying Zheng.Nanomaterials Generated by Laser Ablation in LiquidsBasic mechanism of LAL(laser ablation in liquids)Sketch of the main stages of LALPhys.Chem.Chem.Phys.,2013,15

2、,3027-3046Basic mechanism of LALSketch of the plasma plume formed by laser ablation of a metal target.*Denotes excited and/or ionized statesPhys.Chem.Chem.Phys.,2009,11,38053821Basic mechanism of LALFeO Nanoparticles by LALAdv.Funct.Mater.2012,22,13331353Nanoparticles Derived from LAL methodMetastab

3、le structureUltra-small size distributionUnoccupied/charged surfacesEasy-functionalizationNew structures and propertiesQuantum size effectsHigh activity and reactivityLAL-inducedNPsStable and surface passivated Nanoparticles Synthesized by Chemical Routes Capped with various stable reagents to preve

4、nt aggregation or reactionA(assemble or growth)A+B=C New compounds=AB Composites Activity and Reactivity CBAAB+A+AAAAAorExamples1.LAL-based to fabricate carbon-encapsulated metal carbides2.LAL-based synthesis of ternary oxides3.LAL-based complex oxidenoble metal nanocompositespulse laseracetonetarge

5、tTantalum target1.LAL-based to fabricate carbon-encapsulated metal carbidesTaCC NPsCarbon,2013,55,108115 NbCC MoxCC Co3CCMo in ethonalNb in ethonalCo in acetoneMore products can be synthesizedthe formation process of carbon-encapsulated metal carbides2.LAL-based synthesis of ternary oxidesJ.Mater.Ch

6、em.,2012,22,1721017214Design for ternary oxides based on A+B=Cvarious ternary oxidesMorphology,structure and size can be modifiedReaction temperatureReaction timepH value3.LAL-based complex oxidenoble metal nanocompositesAdv.Mater.2013,25,20402044Brief Summary LAL-generated NMs present unique activity,beneficial for obtaining new properties and new structures LAL-generated NMs display unique reactivitycan be used as precursors for preparing new materials Laser-generated NMs show unique applicationin catalyst,biosensor etc.