Novel Fe3O4-CdSe nanocomposites were prepared by depositing semiconductor on monodisperse magnetic nanoparticles. First, monodisperse Fe3O4 nanoparticles were fabricated by a solvothermal process in which iron acetylacetonate (Fe(acac)3) was used as precursor, phenyl ether as reaction medium, oleic acid as surfactant and oleylamine (OAm) as both surfactant and reducing agent. Novel Fe3O4-CdSe heterostructures were prepared using 1-octadecene as high boiling solvent, cadmium oxide as Cd precursor, trioctyl phosphate (TOP)-Se as Se precursor, n-hexadecylamine (HDA) as surfactant, and stearic acid (SA) as growth promoter and nucleating agent. The structure and properties of the Fe3O4-CdSe nanocomposite were ful y characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectrometry, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), UV-Vis spectrum, and photoluminescence (PL). CdSe nanoparticles were successful y attached to the surface of Fe3O4 and grew along the c-axis to form novel jujube pit-liked and nail-liked heterostructures with a width of 3.6 nm and length of 14.5 and 32.5 nm, % 以1-十八烯作为高沸点溶剂,在磁性粒子表面沉积量子点获得新型的磁性荧光Fe3O4-CdSe纳米异质结构.首先以乙酰丙酮铁(Fe(acac)3)为前驱体,二苯醚为溶剂,油酸为表面活性剂和油胺(OAm)为表面活性剂兼还原剂,通过溶剂热法制备单分散性的Fe3O4纳米粒子.然后以1-十八烯为高沸点溶剂, CdO为镉源, TOP-Se为硒源,十六胺为表面活性剂以及硬脂酸为生长促进剂和成核剂制备得到新型的Fe3O4-CdSe纳米异质结构.通过透射电镜(TEM),傅里叶变换红外(FTIR)光谱, X射线衍射(XRD)谱, X射线光电子能谱(XPS)分析仪,振动样品磁强计(VSM),紫外-可见(UV-Vis)光谱和光致发光(PL)等手段对Fe3O4-CdSe纳米复合材料的结构和性能进行表征.结果表明, CdSe纳米粒子成功地吸附在Fe3O4纳米粒子表面,并沿着c轴生长,形成了宽3.6 nm,长分别为14.5和32.5 nm的新型枣核状和钉子状的异质结构体.这种新型的Fe3O4-CdSe纳米复合材料是由磁铁矿Fe3O4和六方形的CdSe棒状结构组成,具有较好的荧光性能和超顺磁性.随着CdSe棒长度的增加,荧光吸收峰向长波方向移动. Fe3O4纳米粒子,枣核状和钉子状的Fe3O4-CdSe纳米复合材料的饱和磁化强度分别是57.80,40.76和31.10 emu·g-1.
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