Abstract Fe3O4 nanoparticles (NPs) with a face-centered cubic (fcc) structure and two different morphologies (nanospheres and nanoprisms) were synthesized by a facile one-step method. The synthesized Fe3O4 nanospheres and nanoprisms were monocrystalline and separable in a magnetic field. In different volume ratios of oleylamine (OAm) to dibenzyl ether, the sizes of the prepared Fe3O4 NPs ranged from 5 to 21 nm. The OAm amount in the synthesis can significantly control the morphology of Fe3O4 NPs. As the OAm content increased from 10 ml to 30 ml, the faceted nanoprisms shrank while the nanospheres enlarged. At an OAm content of 25 ml, the nanoprisms diminished while more hexagonal and sphere-like particles appeared, implying a critical point of morphology transition from triangle to hexagon. The magnetic properties also depended on the NP morphology and size. The prepared Fe3O4 NPs are promising candidates in medical applications such as magnetic resonance imaging, targeted drug delivery, blood purification, and tumor hyperthermia.

中文翻译：

---

同时获取 Fe3O4 单晶：具有各种形态的可调磁特性

摘要 通过简便的一步法合成了具有面心立方 (fcc) 结构和两种不同形态（纳米球和纳米棱柱）的 Fe3O4 纳米粒子 (NPs)。合成的 Fe3O4 纳米球和纳米棱柱是单晶的，可在磁场中分离。在油胺 (OAm) 与二苄醚的不同体积比下，制备的 Fe3O4 NPs 的尺寸范围为 5 到 21 nm。合成中的 OAm 量可以显着控制 Fe3O4 NPs 的形貌。随着 OAm 含量从 10 ml 增加到 30 ml，多面纳米棱柱缩小而纳米球扩大。在 OAm 含量为 25 ml 时，纳米棱柱减少，同时出现更多六边形和球形颗粒，这意味着从三角形到六边形的形态转变临界点。磁性还取决于纳米颗粒的形态和尺寸。制备的 Fe3O4 NPs 在医学应用中是有前景的候选者，如磁共振成像、靶向药物输送、血液净化和肿瘤热疗。