Enhanced structural and magnetic properties of fcc colloidal crystals of cobalt nanoparticles,Nanoscale

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Enhanced structural and magnetic properties of fcc colloidal crystals of cobalt nanoparticles
Nanoscale ( IF 5.8 ) Pub Date : 2020-11-17 , DOI: 10.1039/d0nr05517d
S. Costanzo _{1,

2,

3,

4,

5} , A. T. Ngo _{1,

2,

3,

4,

5} , V. Russier _{6,

7,

8} , P. A. Albouy _{8,

9,

10,

11} , G. Simon _{1,

2,

3,

4,

5} , Ph. Colomban _{1,

2,

3,

4,

5} , C. Salzemann _{1,

2,

3,

4,

5} , J. Richardi _{1,

2,

12,

13,

14} , I. Lisiecki _{1,

2,

3,

4,

5}

Affiliation

We report the elaboration of supercrystals made up of dodecanoic acid-coated 8.1 nm-Co nanocrystals with controlled supercrystallinity, morphology and magnetic properties. Supercrystal growth is controlled using a solvent-mediated ligand–ligand interaction strategy. Either face-centered cubic supercrystalline films or single colloidal crystals composed of cobalt nanocrystals are obtained. The change in supercrystal morphology is explained by Flory-type solvation theory using Hansen solubility colloidal parameters. The use of the same batch of Co nanocrystals for the fabrication of supercrystalline films and colloidal crystals enables accurate comparative structural and magnetic studies using (high-resolution) transmission electron microscopy, field emission gun scanning electron microscopy, grazing incidence small-angle X-ray scattering and vibrating sample magnetometry. The nearest neighbor distance between nanoparticles is interpreted using theoretical models proposed in the literature. We evidence the increase in both geometric anisotropy and magnetic dipolar interactions for colloidal crystals compared to supercrystalline films.

中文翻译：

钴纳米颗粒的fcc胶体晶体的增强的结构和磁性

我们报告了由十二烷酸涂层的8.1 nm-Co纳米晶体组成的超晶体的精细加工，该晶体具有可控的超结晶度，形态和磁性。使用溶剂介导的配体-配体相互作用策略可控制超晶的生长。获得面心立方超晶膜或由钴纳米晶组成的单个胶体晶体。使用Hansen溶解度胶体参数的Flory型溶剂化理论解释了超晶形态的变化。使用同一批Co纳米晶体制造超晶膜和胶体晶体，可以使用（高分辨率）透射电子显微镜，场发射枪扫描电子显微镜，掠入射小角X射线散射和振动样品磁强法。使用文献中提出的理论模型解释纳米颗粒之间的最近邻居距离。我们证明，与超晶膜相比，胶体晶体的几何各向异性和磁偶极相互作用都增加了。

更新日期：2020-11-27

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