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Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets

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Long-Range Magnetic Order in Nickel Hydroxide-Functionalized Graphene Quantum Dots.

Lukáš Michal¹, Rajarshi Roy¹, David Holec²

¹CEITEC, Masaryk University, Kamenice 5, 62500Brno, Czech Republic.

The Journal of Physical Chemistry Letters

|December 8, 2022

Summary

Chemically synthesized nickel-doped graphene quantum dots (GQDs) exhibit antiferromagnetic ordering. This magnetic behavior arises from d-p mixing hybridization, leading to tunable spin properties in these magnetic nanomaterials.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Graphene quantum dots (GQDs) are typically paramagnetic.
Controlling magnetic properties of nanomaterials is crucial for advanced applications.

Purpose of the Study:

To synthesize and investigate the magnetic properties of transition metal (Ni) doped GQDs.
To elucidate the mechanism behind the observed magnetic ordering.

Main Methods:

Chemical synthesis of nickel hydroxide-doped GQDs.
Magnetic susceptibility measurements (M-T profile).
Ab initio simulations for theoretical validation.

Main Results:

Observed antiferromagnetic ordering in Ni-doped GQDs around 10 K.
Spin exchange coupling changed from J = 1/2 to J = 1 due to d-p mixing hybridization.
Ab initio simulations confirmed spin polarization and asymmetry around the Fermi level.
Net magnetic moment was found to be site-dependent on carbon atoms (surface/edge).

Conclusions:

Nickel doping induces significant magnetic properties in GQDs.
d-p mixing hybridization is the key mechanism for magnetic ordering.
Site-dependent magnetic moments offer potential for tailored spintronic devices.