嵌段共聚物模板法制备CoFe_2O_4纳米有序点阵列

Synthesis of CoFe_2O_4 Nanodot Arrays via Diblock Copolymer Template Method

嵌段共聚物PS-b-PMMA经离心涂膜,在丙酮蒸汽熏蒸条件下发生微相分离自组装,选择性刻蚀后制备了具有有序阵列纳米孔洞的嵌段共聚物模板。然后使用溶胶凝胶法在嵌段共聚物模板上沉积CoFe2O4前驱体,通过热处理去除交联的聚苯乙烯以及使CoFe2O4结晶化,从而制备了CoFe2O4纳米点阵列。扫描电子显微镜(SEM)、振动样品磁强计(VSM)、X射线衍射仪(XRD)被用于研究嵌段共聚物模板以及CoFe2O4磁性纳米点阵列的形貌、结构与磁性能。结果显示制备的CoFe2O4纳米点阵列中的纳米点为反尖晶石型CoFe2O4相,直径15~20nm左右、点间距100nm左右。同时,VSM测试显示CoFe2O4纳米点阵列呈铁磁性,矫顽力约为1350×79.6A/m,无明显磁性各向异性。

The PS-b-PMMA nanoporous diblock copolymer templates were synthesized via a route of spin-coating, self-assembly in acetone fumigating vapor and selective etching. Then cobalt ferrite (CoFe2O4) nanodot arrays were prepared in the nanoporous copolymer templates by a sol-get method and heat treatment. The morphology of the templates and CoFe2O4 nanodot arrays was observed using scanning electron microscope (SEM). The structure and magnetic properties of the CoFe2O4 nanodot arrays were analyzed using X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The result shows that the synthesized CoFe2O4 nanodots have an inverse spinel structure. The size of the nanodots is between 15~20 nm and the spacing of the arrays is about 100 nm. Besides, VSM test shows that CoFe2O4 nanodot arrays exhibit ferromagnetism and have a coercivity of about 1350×79.6 A/m without magnetic anisotropy.