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Enhancement of antioxidant activity of well dispersed core-shell structured CeO2 coating Au nanorods under visible light irradiation.

07:00 EST 13th February 2020 | BioPortfolio

Summary of "Enhancement of antioxidant activity of well dispersed core-shell structured CeO2 coating Au nanorods under visible light irradiation."

Gold nanoparticles (AuNPs) modification shows great advantages in improving the antioxidant activity of nanoCeO2. However, the improved effect of AuNPs modification become smaller and even results the decrease of antioxidant ability due to the severe aggregation with the increase of nanomaterials' concentration. Additionally, the effects of photo-properties of AuNPs on the antioxidant activity of nanoCeO2 have not been studied. In response to these problems, a core-shell shaped Au@CeO2 was synthesized which took Au nanorods (AuNRs) as carriers and with a layer of CeO2 nanoparticles (NPs) coating. The antioxidant activity of Au@CeO2 was evaluated by UV-vis method in MV-Fenton system. Results showed that AuNRs could improve the antioxidant activity of nanoCeO2 due to the increase of Ce3+ amount on the surface of nanoCeO2, and the enhancing effect was remained across the whole experimental concentration range due to the good dispersibility of AuNRs. Additionally, a further increase of the antioxidant ability of Au@CeO2 has been found with 5 min visible light irradiation, and continuous irradiation during a 25 min time reaction resulted in more obvious enhanced antioxidant ability. This phenomenon was attributed to the localized surface plasmon resonance (LSPR) of AuNRs triggered by photons which induced charge transfer from AuNRs to nanoCeO2, thus making the recycle become easier between Ce3+ and Ce4+.

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This article was published in the following journal.

Name: Nanotechnology
ISSN: 1361-6528
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