Plasmon-induced tuning of cerium oxidation states in Au@CeOx core@shell nanoparticles

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00637224" target="_blank" >RIV/68378271:_____/25:00637224 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/25:10510443
Result on the web
<a href="https://doi.org/10.1063/5.0272916" target="_blank" >https://doi.org/10.1063/5.0272916</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/5.0272916" target="_blank" >10.1063/5.0272916</a>

Result language
angličtina
Original language name
Plasmon-induced tuning of cerium oxidation states in Au@CeOx core@shell nanoparticles
Original language description
CeOx-based nanoforms are widely used in catalysis, or biomedical applications due to their redox activity and oxygen storage capacity. The key parameters determining their surface chemistry are the Ce3+/Ce4+ ratio and the ability to transition between Ce4+ and Ce3+ states. We synthesized Au@CeOx core@shell nanoparticles with different thicknesses of CeOx shells and different Ce3+/Ce4+ ratios through a photothermal reaction driven by localized surface plasmon resonances (LSPRs) at the Au nanoparticle surface induced by visible light. We introduce a way to further enhance the Ce3+/Ce4+ ratio in the shell by exposing the Au@CeOx nanoparticles to visible light using a green laser (532 nm, 50 mW). Our findings based on photoelectron spectroscopy indicate that the Ce4+-to-Ce3+ transition results from LSPR-induced superheating of the Au/CeOx interface, leading to the formation of oxygen vacancies and reduction of Ce4+ ions. This process is reversible upon air exposure suggesting that the ability to transition between the Ce4+ and Ce3+ states is retained in the Au@CeOx nanoparticles. Our study presents the CeOx-based nanoforms with a tunable cerium valence state ratio, highlighting the potential of plasmonic control in optimizing their photocatalytic and enzyme-mimetic properties.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/LM2023051" target="_blank" >LM2023051: Research infrastructure CzechNanoLab</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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