Magnetic Prussian Blue Analog Nanowires

Magnetic Prussian Blue Analog Nanowires

Author: ChemNanoMat

Magnetic nanomaterials play a key role in research and industry. Their usefulness is most often determined by the magnetic anisotropy. Therefore, the creation and control of magnetic anisotropy is a research target.

Anne Bleuzen, Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris-Sud, Université Paris-Saclay, Orsay, France, and colleagues have used a template approach for the anisotropic assembly of coordination nanocrystals into chains. The team used an ordered mesoporous silica monolith as template. Its mesopores have a 2D-hexagonal structure (pictured). The team grew nanowires from NiFe Prussian blue analog nanoparticles (Ni4[Fe(CN)6]2,7·x H2O) within the nanochannels of the silica. The resulting nanowires are made of single chains of nanocrystals.

Macroscopic fragments of the modified monolith show a remarkably strong anisotropy in their magnetic properties. This effect is caused by a magnetic dipolar interaction along the chains of coordination nanocrystals and is spread to the macroscopic scale thanks to the long-range organization of the pores.


 

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