选用十二烷基苯磺酸钠(SDBS)作为表面活性剂,采用软液相合成法(soft-solution approach),通过控制表面活性剂十二烷基苯磺酸钠(SDBS)与FePt前驱体的摩尔比(SDBS/FePt),成功制备出了形貌各向异性的FePt纳米颗粒.XRD,TEM表征结果显示:调节摩尔比SDBS/FePt分别为7∶1,9∶1,11∶1时,所制备纳米颗粒均显示化学无序的面心立方(FCC)结构,但颗粒形貌却分别呈现出球形、不规则片状和树枝状结构.振动样品磁强计(VSM)检测结果显示:室温下,所制备颗粒矫顽力显示为零,均表现超顺磁性；惰性气体Ar保护下,500℃保温30 min热处理后,颗粒由超顺磁性转化为铁磁性；当调节摩尔比SDBS/FePt分别为7∶1,9∶1,11∶1时,矫顽力分别显示4489,30429,18457A·m-1；饱和磁化强度也大大改善,分别显示6.65,22.45,11.43 Am2 ·kg-1.由此可以看出:当调节摩尔比SDBS/FePt为9∶1时,磁能积相对最大.FePt纳米颗粒的磁性能是颗粒尺寸、形貌、组分、结晶性、结构等因素综合作用的结果,推测该结果主要与FePt纳米颗粒的各向异性形貌有关.通过改变表面活性剂的用量可以调节纳米颗粒的形貌,从而改善颗粒的磁性能,这为FePt纳米颗粒的形貌控制以及磁性能的调节提供了一条新途径.
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