钴掺杂的磁性氧化铁纳米粒子的可控合成

引用本文: 李振湖, 马玉荣, 齐利民. 钴掺杂的磁性氧化铁纳米粒子的可控合成[J]. 物理化学学报, 2012, 28(10): 2493-2499. doi: 10.3866/PKU.WHXB201209071 shu

Citation: LI Zhen-Hu, MA Yu-Rong, QI Li-Min. Controlled Synthesis of Cobalt-Doped Magnetic Iron Oxide Nanoparticles[J]. Acta Physico-Chimica Sinica, 2012, 28(10): 2493-2499. doi: 10.3866/PKU.WHXB201209071 shu

钴掺杂的磁性氧化铁纳米粒子的可控合成

基金项目:
国家自然科学基金(50902002, 51121091) (50902002, 51121091)

高等学校博士学科点专项科研基金(20090001120015)资助项目 (20090001120015)

摘要:

通过油酸盐前驱体高温热解法制备出大小均匀的钴掺杂四氧化三铁球形纳米粒子, 其钴/铁摩尔比可以通过调节油酸钴与油酸铁的比例进行调变. 当产物中钴/铁摩尔比从0.024增加到0.156, 所制备的氧化铁纳米粒子的饱和磁矩从39 emu·g^-1逐渐减小到30 emu·g^-1, 而矫顽力从0 Oe升至190 Oe. 在305℃下, 随着反应体系的热解时间由0.5 h 增加到3 h, 所制备出的氧化铁纳米粒子尺寸逐渐由7 nm增加到14 nm. 热解时间较短时, 以高价态的四氧化三铁的晶型为主, 辅之以少量的氧化亚铁; 热解时间增加至2 h, 产物的晶型为四氧化三铁和氧化亚铁的复合物; 而继续增加热解时间至3 h, 除四氧化三铁和氧化亚铁之外, 还出现少量的零价态的CoFe合金, 说明铁(钴)元素经历了由三价到二价, 最后被还原为零价的过程. 随着反应温度的升高, 产物的尺寸逐渐增大, 同时产物中氧化亚铁的含量增多.

关键词:

钴掺杂
/ 磁性
/ 氧化铁
/ 可控合成
/ 热解

English

Controlled Synthesis of Cobalt-Doped Magnetic Iron Oxide Nanoparticles

1.
Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering,Peking University, Beijing 100871, P.R. China
Received Date: 31 July 2012
Available Online: 26 September 2012
Fund Project:
国家自然科学基金(50902002, 51121091)

高等学校博士学科点专项科研基金(20090001120015)资助项目

Abstract:

Uniform sphere-like Co-doped iron oxide nanoparticles were synthesized by the thermolysis of iron oleate and cobalt oleate precursors in octadecene in the presence of oleic acid. The Co/Fe mole ratios in the final Co-doped iron oxide can be controlled by changing their ratios in the reaction precursors. With the increase of Co/Fe mole ratios from 0.024 to 0.156 in the final iron oxide nanoparticles, the magnetic saturation values of the nanoparticles slightly decreased from 39 to 30 emu·g^-1, while their coercivity values increased from 0 to 190 Oe. The sizes of the Co-doped iron oxide nanoparticles increased from 7 to 14 nm when the thermolysis time was increased from 0.5 to 3 h with a thermolysis temperature 305℃. Generally, with increasing thermolysis time the metal elements in the final nanoparticles were partially reduced. The domain polymorph of the final nanoparticles was magnetite with a very small amount of ferrous oxide for thermolysis time less than 1 h, while the phases were a mixture of magnetite and wüstite ferrous oxide for thermolysis time longer than 2 h. Further increasing thermolysis time to 3 h, except Fe₃O₄ and FeO, CoFe alloys appear too. It indicates that the iron (cobalt) elements were reduced from trivalence to bivalence, and finally to zero valence. The sizes of the iron oxide nanoparticles increased and more ferrous oxide appeared in the final products with increasing the thermolysis temperature.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

钴掺杂的磁性氧化铁纳米粒子的可控合成

English

Controlled Synthesis of Cobalt-Doped Magnetic Iron Oxide Nanoparticles

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

钴掺杂的磁性氧化铁纳米粒子的可控合成

English

Controlled Synthesis of Cobalt-Doped Magnetic Iron Oxide Nanoparticles

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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