Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.
International Institute for Nanotechnology, Northwestern University, Evanston, IL, 60208, USA.
Angew Chem Int Ed Engl. 2017 Jun 19;56(26):7625-7629. doi: 10.1002/anie.201703296. Epub 2017 May 16.
Multicomponent nanoparticles can be synthesized with either homogeneous or phase-segregated architectures depending on the synthesis conditions and elements incorporated. To understand the parameters that determine their structural fate, multicomponent metal-oxide nanoparticles consisting of combinations of Co, Ni, and Cu were synthesized by using scanning probe block copolymer lithography and characterized using correlated electron microscopy. These studies revealed that the miscibility, ratio of the metallic components, and the synthesis temperature determine the crystal structure and architecture of the nanoparticles. A Co-Ni-O system forms a rock salt structure largely owing to the miscibility of CoO and NiO, while Cu-Ni-O, which has large miscibility gaps, forms either homogeneous oxides, heterojunctions, or alloys depending on the annealing temperature and composition. Moreover, a higher-ordered structure, Co-Ni-Cu-O, was found to follow the behavior of lower ordered systems.
多组分纳米粒子可以通过均相或相分离结构来合成，具体取决于合成条件和所包含的元素。为了了解决定其结构命运的参数，使用扫描探针嵌段共聚物光刻法合成了由 Co、Ni 和 Cu 组成的多组分金属氧化物纳米粒子，并通过相关电子显微镜进行了表征。这些研究表明，多组分金属氧化物纳米粒子的混合性、金属成分的比例和合成温度决定了纳米粒子的晶体结构和形貌。Co-Ni-O 系统主要由于 CoO 和 NiO 的混合性而形成岩盐结构，而具有较大混合间隙的 Cu-Ni-O 则根据退火温度和组成形成均匀氧化物、异质结或合金。此外，还发现具有较高有序度的 Co-Ni-Cu-O 遵循较低有序度体系的行为。
