Composition and Electronic Structure of La2O3/CNFs@C Core-Shell Nanoparticles with Variable Oxygen Content

Suslova, E.V.; Ulyanov, A.N.; Kozlov, A.P.; Shashurin, D.A.; Savilov, S.V.; Chelkov, G.A.

Авторы: Suslova Evgeniya V., Ulyanov Alexander N., Kozlov Alexey P., Shashurin Denis A., Savilov Serguei V., Chelkov Georgy A.
Журнал: Nanomaterials
Том: 13
Номер: 22
Год издания: 2023
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 2945
DOI: 10.3390/nano13222945
Аннотация: La2O3 nanoparticles stabilized on carbon nanoflake (CNF) matrix were synthesized and graphitized to produce core-shell structures La2O3/CNFs@C. Further oxidation of these structures by nitric acid vapors for 1, 3 or 6 h was performed, and surface-oxidized particles La2O3/CNFs@C_x(x = 1, 3, 6) were produced. Bulk and surface compositions of La2O3/CNFs@C and La2O3/CNFs@C_xwere investigated by thermogravimetric analysis and X-ray photoelectron spectroscopy. With increasing the duration of oxidation, the oxygen and La2O3 content in the La2O3/CNFs@C_x samplesincreased. The electronic structures of samples were assessed by electron paramagnetic resonance.Two paramagnetic centers were associated with unpaired localized and mobile electrons and wereregistered in all samples. The correlation between bulk and surface compositions of the samples andtheir electronic structures was investigated for the first time. The impact of the ratio between sp2 - and sp3-hybridized C atoms, the number and nature of oxygen-containing groups on the surface and the presence and proportion of coordinated La atoms on the EPR spectra was demonstrated.
Добавил в систему: Суслова Евгения Викторовна

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Composition and Electronic Structure of La2O3/CNFs@C Core-Shell Nanoparticles with Variable Oxygen Contentстатья

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