Ferromagnetic stability optimization via oxygen-vacancy control in single-atom Co/TiO<sub>2</sub> nanostructures.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39556744.
- Also identified by DOI 10.1073/pnas.2409397121 and PMC identifier 11621849.
- Licence recorded as CC BY-NC-ND.
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Abstract
Oxygen vacancies and their correlation with the nanomagnetism and electronic structure are crucial for applications in dilute magnetic semiconductors design applications. Here, we report on cobalt single atom-incorporated titanium dioxide (TiO<sub>2</sub>) monodispersed nanoparticles synthesized using a thermodynamic redistribution strategy. Using advanced synchrotron-based X-ray techniques and simulations, we find trivalent titanium is absent, indicating trivalent cations do not influence ferromagnetic (FM) stability. Density functional theory calculations show that the FM stability between Co<sup>2+</sup> ions is very weak. However, electron doping from additional oxygen vacancies can significantly enhance this FM stability, which explains the observed room-temperature ferromagnetism. Moreover, our calculations illustrate enhanced FM interactions between Co<sub>Ti</sub> + V<sub>O</sub> complexes with additional oxygen vacancies. This study explores the electronic structure and room-temperature ferromagnetism using monodispersed nanocrystallites with single-atom-incorporated TiO<sub>2</sub> nanostructures. The strategies described herein offer promise in revealing magnetism in other single-atom-incorporated nanostructures.