Visualization of nano-localized and delocalized oxidation sites for plasmon-induced charge separation

Oxidation reaction sites for plasmon-induced charge separation at Au nanocubes on TiO 2 were visualized on the basis of deposition and dissolution reactions. For Pb 2+ oxidation, PbO 2 was deposited selectively at resonance sites of the nanocube, while oxidation polymerization of pyrrole to polypyrr...

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Published inNanoscale Vol. 13; no. 2; pp. 681 - 684
Main Authors Ogata, Rui, Nishi, Hiroyasu, Ishida, Takuya, Tatsuma, Tetsu
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 21.01.2021
Subjects
Dissolution
Lead oxides
Oxidation
Polypyrroles
Separation
Titanium dioxide
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Summary:Oxidation reaction sites for plasmon-induced charge separation at Au nanocubes on TiO 2 were visualized on the basis of deposition and dissolution reactions. For Pb 2+ oxidation, PbO 2 was deposited selectively at resonance sites of the nanocube, while oxidation polymerization of pyrrole to polypyrrole and oxidative dissolution of Au took place over the entire nanocube surface. The localized and delocalized reaction sites are explained in terms of a relationship between oxidation potentials of the electron donors and potentials of the entire nanocube and localized holes. Plasmonic reactions with relatively positive oxidation potentials occur locally at resonance sites, while reactions with more negative potentials proceed nonlocally.
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ISSN:2040-3364
2040-3372
DOI:10.1039/d0nr08552a