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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216208:11320/25:10510443

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/LM2023051" target="_blank" >LM2023051: Výzkumná infrastruktura CzechNanoLab</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Physics Letters

ISSN

0003-6951

e-ISSN

1077-3118

Svazek periodika

126

Číslo periodika v rámci svazku

25

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

251602

Kód UT WoS článku

001517739000020

EID výsledku v databázi Scopus

2-s2.0-105009057927