铁纳米颗粒的脉冲激光气相蒸发-液相合成研究  

Synthesis of Fe Nanoparticles by Pulsed Laser Gas Phase Evaporation-Liquid Phase Collection

作　　者：陈岁元[1] 陈双建[1] 梁京[1] 刘常升[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2012年第7期962-964,974,共4页Journal of Northeastern University(Natural Science)

基　　金：中央高校基本科研业务费专项资金资助项目(N100702001);教育部留学回国人员科研启动基金资助项目(42-1)

摘　　要：采用激光气相蒸发-液相收集新方法合成纳米Fe颗粒,主要利用扫描电镜、透射电镜和振动样品磁强计等分析方法对纳米颗粒的形貌、大小、磁性及合成机理进行了分析.结果表明：以45#钢为靶材、20%乙二醇＋80%乙醇为液相收集体系和N2为载气,在激光能量密度为42 J/mm2、脉宽3 ms、频率10 Hz和N2流量为0.5 L/min的条件下,成功制备出了Fe纳米颗粒;颗粒呈球形且呈链状连接趋势,主要粒径在20~30nm之间;纳米铁颗粒矫顽力为523 Oe,饱和磁化强度为45 emu/g;脉冲激光诱导45#钢靶材产生含Fe成分的等离子体,在气相中均匀成核,并发生一定程度的长大,然后在载气N2的带动下进入液相中进一步生长为纳米颗粒,液相中的乙二醇起到了原位分散纳米颗粒的作用.Fe nanoparticles were synthesized by a new method of pulse laser gas phase evaporation-liquid phase collection. The morphology, structure, magnetic properties and synthesis mechanism were studied by scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and vibration magnetometer. The results showed that using 45# steel as the target, 20 % ethylene glycol ＋ 80 % ethanol as the liquid collection system, and N2 as the carrier gas, Fe nanoparticles are successfully prepared under the conditions of the laser power density 42 J/mm2, pulse width 3 ms, frequency 10 Hz, and the N2 flow 0.5 L/min. The particles are spherical and show a trend of chain connectivity, the main size of the Fe particles is 20-30 nm; the coercivity of iron nanoparticles is 523 Oe, the saturation magnetization is 45 emu/g. The plasma with Fe composition was generated from 45 # steel target by pulsed laser ablation, after homogeneous nucleation and growing of crystal nucleus in the gas phase, Fe crystal nucleus grew up to nano-size Fe particles when they were carried by N2 into the liquid phase. Ethylene glycol in the liquid has played a role in the dispersion of Fe nanoparticles in situ.

关 键 词：纳米铁颗粒 激光气相蒸发-液相收集 原位分散 靶材 液相 

分 类 号：TG141[一般工业技术—材料科学与工程]