聚丙烯酰胺辅助溶剂热技术制备磁性钴纳米线

发布时间：2018-01-15 20:01

  本文关键词：聚丙烯酰胺辅助溶剂热技术制备磁性钴纳米线　出处：《辽宁师范大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 六方钴纳米线 溶剂热 丙烯酰胺 铁磁性

【摘要】：钴纳米材料具有优异的光、电、磁、催化性能及六边形密堆积的晶体结构,在高密度磁记录、磁分离、磁流体、传感器、生物医药和催化等方面具有广阔的应用前景。而材料的电磁性质与材料的结构、尺寸、形貌、晶型息息相关。因此发展一种简单温和、结构和形貌可控的的合成技术制备高矫顽力的Co纳米材料具有重要的科学意义。本文采用溶剂热合成路线,通过添加表面活性剂作为结构导向剂,获得了拥有极高矫顽力的钴纳米线。具体研究内容如下:以氯化钴为钴源、丙烯酰胺为模板剂,采用溶剂热合成技术在乙二醇和乙二胺二元混合溶液中制得了高产率、尺度均匀、大长径比的六方相钴纳米线。并通过XRD、EDX、SEM、TEM及HRTEM等手段考察了实验参数(温度、时间、丙烯酰胺的量、乙二醇和乙二胺体积比及NaOH浓度等)对产物晶相、形貌和尺寸的影响规律。结果表明六方相钴纳米线的最佳合成条件为:T=200℃、t=10 h、6 M NaOH、ethyleneglycol/ethylenediamine=1:5(体积比)及0.3克丙烯酰胺。利用超导量子干涉法(SQUID)法研究了六方相钴纳米线在室温下的磁性质,结果表明该样品显示了良好的铁磁性特征,其饱和磁化强度(Ms)为149 emu/g,剩余磁化强度(Mr)为49 emu/g,剩磁比为0.33。尤其值得注意的是:与块状Co相比(10 Oe)及纳米Co空心球(66 Oe)和链式Co(90 Oe、169 Oe)相比,该Co纳米线具有极高的矫顽力(365 Oe),这缘于利用该方法合成的Co纳米线具有大长径比,在长轴方向上显示磁各向异性。此材料在磁性记录及数据储存等领域具有潜在的应用前景。
[Abstract]:Cobalt nanomaterials have excellent optical, electrical, magnetic, catalytic properties and hexagonal dense stacked crystal structure, in high density magnetic recording, magnetic separation, magnetic fluid, sensors. Biomedicine and catalysis have broad application prospects. The electromagnetic properties of the materials are closely related to the structure, size, morphology and crystal structure of the materials. Therefore, the development of a simple and mild. The preparation of high coercivity Co nanomaterials with controllable structure and morphology is of great scientific significance. In this paper, the solvothermal synthesis route is adopted, and surfactant is added as the structure guide agent. Cobalt nanowires with extremely high coercivity were obtained. The specific research contents are as follows: cobalt chloride as cobalt source and acrylamide as template. The hexagonal cobalt nanowires with high yield, uniform scale and large aspect ratio were prepared by solvothermal synthesis in the binary solution of ethylene glycol and ethylenediamine. The effects of experimental parameters (temperature, time, amount of acrylamide, volume ratio of ethylene glycol to ethylenediamine and concentration of NaOH) on the crystal phase of the product were investigated by TEM and HRTEM. The results show that the optimum synthesis conditions of hexagonal cobalt nanowires are as follows: (1) T ~ (2 +) ~ (200) 鈩，

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