Chang Hogeun, Kim Byung Hyo, Lim Suk Gyu, Baek Hayeon, Park Jungwon, Hyeon Taeghwan
Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea.
School of Chemical and Biological Engineering and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea.
Inorg Chem. 2021 Apr 5;60(7):4261-4268. doi: 10.1021/acs.inorgchem.0c03567. Epub 2021 Jan 31.
Ternary oxide nanoparticles have attracted much interest because of their intriguing properties, which are not exhibited by binary oxide nanoparticles. However, the synthesis of ternary oxide nanoparticles is not trivial and requires a fundamental understanding of the complicated precursor chemistry that governs the formation mechanism. Herein, we investigate the role of the chemical composition of precursors in the formation of ternary oxide nanoparticles via a combination of mass spectrometry, electron microscopy with elemental mapping, and thermogravimetric analysis. Mn, Co, and Ni ions easily form bimetallic-oxo clusters with Fe ions with a composition of MFeO(oleate) (M = Mn, Co, Ni). The use of clusters as precursors leads to the successful synthesis of monodisperse metal ferrite nanoparticles (MFeO). On the contrary, zinc- or copper-containing complexes are formed independently from iron-oxo clusters in the precursor synthesis. The mixture of complexes without a bimetallic-oxo core yields a mixture of two different nanoparticles. This study reveals the importance of the precursor composition in the synthesis of ternary oxide nanoparticles.
三元氧化物纳米颗粒因其具有二元氧化物纳米颗粒所不具备的有趣特性而备受关注。然而，三元氧化物纳米颗粒的合成并非易事，需要对控制形成机制的复杂前驱体化学有深入的理解。在此，我们通过质谱分析、带有元素映射的电子显微镜以及热重分析相结合的方法，研究前驱体的化学成分在三元氧化物纳米颗粒形成过程中的作用。锰、钴和镍离子容易与铁离子形成组成为MFeO(油酸盐)（M = 锰、钴、镍）的双金属氧簇。使用这些簇作为前驱体能够成功合成单分散的金属铁氧体纳米颗粒（MFeO）。相反，在前驱体合成过程中，含锌或含铜的配合物是独立于铁氧簇形成的。没有双金属氧核心的配合物混合物会产生两种不同纳米颗粒的混合物。这项研究揭示了前驱体组成在三元氧化物纳米颗粒合成中的重要性。
