利用乙酰丙酮铁(Fe (acac)3)和乙酰丙酮铂(Pt (acac)2)为前驱物质,油胺(Oleylamine)做表面活性剂,通过湿化学法制备了珊瑚状FePt粒子(纳米珊瑚).透射电镜(TEM)分析表明:FePt纳米粒子形貌类似珊瑚,由短棒、球粒子交叉连接在一起;粒子具有良好的分散性,尺寸均匀,是化学无序的FCC结构.借助高分辨透射电镜(HRTEM)研究,推测其生长机制为:在反应初始阶段,前驱物质被还原,形成球形的FePt晶核,晶核长大成均匀的单分散球形纳米粒子;随后在表面活性剂的作用下,当粒子界面品格取向一致时,球形粒子自组装排列到一起,并“焊接”生长成各向异性的短棒状;随着反应继续进行,球形粒子或短棒持续交叉连接、生长,最终形成FePt纳米珊瑚.
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