La(1-x)SrxMnO3/ZnO纳米复合粒子的合成  

Synthesis of La_(1-x)Sr_xMnO_3/ZnO Composite Nanoparticles

作　　者：方宁[1] 贺宏举 程文正[1] 吴君华 刘红玲[1] 

机构地区：[1]河南省多酸化学重点实验室,河南大学化学化工学院,分子与晶体工程研究所,河南开封475004 [2]河南化工技师学院,河南开封475004 [3]南方科技大学,材料科学与工程研究所,广东深圳518055

出　　处：《河南大学学报（自然科学版）》2016年第3期321-326,共6页Journal of Henan University:Natural Science

基　　金：国家自然科学基金(51172064);河南省教育厅科研基金(16A150002)

摘　　要：采用球磨法将La_(1-x)Sr_xMnO_3纳米粒子与ZnO混合研磨成功制备了La_(1-x)Sr_xMnO_3/ZnO纳米复合粒子.通过透射电子显微镜(TEM)、X射线衍射仪(XRD)、紫外可见分光光度计(UV-Vis)、荧光光谱仪(PL)、振动样品磁强计(VSM)和超导量子干涉仪(SQUID)对La_(1-x)Sr_xMnO_3/ZnO纳米复合粒子进行结构和性质研究,结果表明该法合成的La_(1-x)Sr_xMnO_3/ZnO纳米复合粒子平均粒径为12.1nm,几乎呈球形,大小较为均匀,室温下显示良好的光学和磁学性能,有望在光学、磁学和生物医药等领域得到应用.La1-X SrXMnO3/ZnO composite nanoparticles were successfully synthesized by milling the mixture of La1- x Srx MnO3 and ZnO with the ball-milling method. La1-x Srx MnO3 nanoparticles were synthesized via non- aqueous nanoemulsion method using the triblock copolymer poly （ethylene oxide）-poly （propylene oxide）-poly （ethylene oxide） （PEO-PPO-PEO） as the surfactant, lanthanum （III） acetylacetonate （La（acac）3）, strontium （II） acetylacetonate （Sr（acac）2） and manganese （III） acetylaeetonate （Mn（acac）3） as precursors, 1,2-hexadecanediol as the reducing agent. The morphology of the Lal x SrxMnO3/ZnO composite nanoparticles was analyzed by transmission electron microscopy （TEM）. The La1-x Srx MnO3/ZnO composite nanoparticles are virtually uniform and nearly spherical in shape with an average diameter about 12.1 nm and a narrow size distribution. The structures of the La1-x Srx MnO3/ZnO composite nanoparticles were confirmed by X-ray powder diffraction （XRD）. The well- defined, strong, distinct peaks show that the Lal-x SrxMnOa/ZnO composite nanoparticles are in a highly crystalline state. The optical properties of the La1-x Srx MnO3/ZnO composite nanoparticles were investigated using an ultraviolet-visible spectrophotometer （UV-Vis） and a photoluminescence spectrophotometer （PL）. The UV-Vis spectrum of La1-x Sr; MnO3/ZnO shows a well-behaved absorption band locating at - 377 nm from ZnO and a nearly indiscernible plateau between - 330 and - 500 nm from the Lal - SrxMnO3. The PL emission spectrum reveals that the La1-x Srx MnO3/ZnO composite nanoparticles manifest multiple visible fingerprint photoluminescent emissions with two strong emission peaks at -393 and -465 nm, and a weak emission peak at -555 nm. The magnetic properties of the La1-x Srx MnO3/ZnO composite nanoparticles were studied by a vibrating sample magnetometer （VSM） and a superconducting quantum interference device （SQUID）. The hysteresis curve acquired clearly shows that the La1-x S

关 键 词：磨法 La1—xSr MnO3/ZnO纳米复合粒子 光学性质 磁学性质 

分 类 号：TU414.18[建筑科学—岩土工程]