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X-ray Absorption Study of Structural Coupling in Photomagnetic Prussian Blue Analogue Core@Shell Particles

Published

Author(s)

Daniel M Pajerowski, Bruce D. Ravel, Carissa H. Li, Matthieu F. Dumont, Daniel R. Talham

Abstract

X-ray absorption spectroscopy experiments of core@shell, photomagnetic, Prussian blue analogue heterostructures obtain local structure around the magnetic, transition metal ions before and after illumination. Two samples, containing nickel hexacyanochromate (Ni-Cr) and cobalt hexacyanoferrate (Co-Fe) in Ni-Cr@Co-Fe and Co-Fe@Ni-Cr geometries, were studied. Both materials display the well-known photoinduced valence tautomerism of cobalt ions for Co-Fe, accompanied by a large change in cobalt to nitrogen distances. Furthermore, these experimental results show a structural coupling between the photoactive Co-Fe layer to the passive Ni-Cr layer. Finally, the strain across the heterostructured interface in Co-Fe and Ni-Cr containing core@shell models is investigated with simulations that use custom potentials derived from density functional theory calculations.
Citation
Chemistry of Materials
Volume
26

Keywords

Photoinduced magnetism, Prussian blue analogue, heterostructure, nanoparticle, X-ray, core@shell, X-ray absorption spectroscopy
Created April 22, 2014, Updated February 19, 2017