本文關(guān)鍵詞：聚丙烯酰胺輔助溶劑熱技術(shù)制備磁性鈷納米線　出處：《遼寧師范大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 六方鈷納米線 溶劑熱 丙烯酰胺 鐵磁性

【摘要】：鈷納米材料具有優(yōu)異的光、電、磁、催化性能及六邊形密堆積的晶體結(jié)構(gòu),在高密度磁記錄、磁分離、磁流體、傳感器、生物醫(yī)藥和催化等方面具有廣闊的應(yīng)用前景。而材料的電磁性質(zhì)與材料的結(jié)構(gòu)、尺寸、形貌、晶型息息相關(guān)。因此發(fā)展一種簡單溫和、結(jié)構(gòu)和形貌可控的的合成技術(shù)制備高矯頑力的Co納米材料具有重要的科學(xué)意義。本文采用溶劑熱合成路線,通過添加表面活性劑作為結(jié)構(gòu)導(dǎo)向劑,獲得了擁有極高矯頑力的鈷納米線。具體研究內(nèi)容如下:以氯化鈷為鈷源、丙烯酰胺為模板劑,采用溶劑熱合成技術(shù)在乙二醇和乙二胺二元混合溶液中制得了高產(chǎn)率、尺度均勻、大長徑比的六方相鈷納米線。并通過XRD、EDX、SEM、TEM及HRTEM等手段考察了實驗參數(shù)(溫度、時間、丙烯酰胺的量、乙二醇和乙二胺體積比及NaOH濃度等)對產(chǎn)物晶相、形貌和尺寸的影響規(guī)律。結(jié)果表明六方相鈷納米線的最佳合成條件為:T=200℃、t=10 h、6 M NaOH、ethyleneglycol/ethylenediamine=1:5(體積比)及0.3克丙烯酰胺。利用超導(dǎo)量子干涉法(SQUID)法研究了六方相鈷納米線在室溫下的磁性質(zhì),結(jié)果表明該樣品顯示了良好的鐵磁性特征,其飽和磁化強度(Ms)為149 emu/g,剩余磁化強度(Mr)為49 emu/g,剩磁比為0.33。尤其值得注意的是:與塊狀Co相比(10 Oe)及納米Co空心球(66 Oe)和鏈?zhǔn)紺o(90 Oe、169 Oe)相比,該Co納米線具有極高的矯頑力(365 Oe),這緣于利用該方法合成的Co納米線具有大長徑比,在長軸方向上顯示磁各向異性。此材料在磁性記錄及數(shù)據(jù)儲存等領(lǐng)域具有潛在的應(yīng)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，

本文編號：1429826