Magnetic and Spectroscopic Properties of Graphene-Based Materials

Graphene-based materials exhibit a rich interplay of magnetic phenomena and spectroscopic signatures stemming from their two-dimensional carbon lattice and tunable chemical modifications. Pristine graphene is inherently diamagnetic, yet the introduction of defects, heteroatom dopants or oxygen-containing functional groups can localise unpaired electrons and generate paramagnetic or even ferromagnetic responses. These emergent magnetic properties underpin promising applications in spintronics, magnetic sensing and advanced energy storage. Spectroscopic techniques—chiefly electron paramagnetic resonance (EPR), electron spin echo and complementary methods such as Raman spectroscopy and X-ray photoelectron spectroscopy—provide incisive insight into electronic structure, identify distinct paramagnetic centres and probe dynamic charge-transfer processes at defect sites. Recent advances have clarified how edge states, vacancy defects and heteroatom incorporation modulate spin density and mobility, while correlating microstructural features with macroscopic magnetic and electrochemical performance. Together, these studies highlight graphene’s versatility as a platform for next-generation magnetic materials and the essential role of high-resolution spectroscopy in guiding their rational design.

Research from Nature Portfolio

Investigations of graphite oxide have revealed spin-glass behaviour arising from magnetic frustration of delocalised π electrons embedded within sp³-hybridised regions. AC susceptibility measurements demonstrate frequency-dependent freezing of magnetic moments, while negative Curie temperatures and slow relaxation dynamics indicate competing ferromagnetic and antiferromagnetic interactions. This work establishes graphite oxide as a model system in which structural heterogeneity gives rise to unconventional magnetic phases, expanding prospects for carbon-based spintronic and sensor technologies.

Magnetic and Spectroscopic Properties of Graphene-Based Materials publication trend

The graph below shows the total number of articles in magnetic and spectroscopic properties of graphene-based materials across all publications each year (not limited to Nature Index journals).

Technical terms

Electron paramagnetic resonance (EPR): A spectroscopic method for probing unpaired electron spins via resonant microwave absorption in a magnetic field.

Spin-glass behaviour: A disordered magnetic state characterised by randomly frozen spins and slow relaxation due to competing interactions.

Paramagnetic centre: A site within a material hosting one or more unpaired electrons, contributing a net magnetic moment.

π electrons: Delocalised electrons in conjugated carbon networks that govern electrical conductivity and influence magnetic responses.

References

1. Magnetic frustration of graphite oxide. Scientific Reports (2017).
2. In situ Electron paramagnetic resonance spectroelectrochemical study of graphene-based supercapacitors: Comparison between chemically reduced graphene oxide and nitrogen-doped reduced graphene oxide. Carbon (2020).
3. Electron Spin Echo Studies of Hydrothermally Reduced Graphene Oxide. The Journal of Physical Chemistry C (2021).