| Autre titre | Nonlithographic formation of Ta2O5 nanodimple arrays using electrochemical anodization and their use in plasmonic photocatalysis for enhancement of local field and catalytic activity |
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| Téléchargement | - Voir la version finale : Nonlithographic formation of Ta₂O₅ nanodimple arrays using electrochemical anodization and their use in plasmonic photocatalysis for enhancement of local field and catalytic activity (PDF, 8.8 Mio)
- Voir les données supplémentaires : Nonlithographic formation of Ta₂O₅ nanodimple arrays using electrochemical anodization and their use in plasmonic photocatalysis for enhancement of local field and catalytic activity (PDF, 3.1 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.1021/acsami.0c18580 |
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| Auteur | Rechercher : Kisslinger, Ryan1Identifiant ORCID : https://orcid.org/0000-0003-2456-396X; Rechercher : Riddell, Saralyn; Rechercher : Manuel, Ajay P.1; Rechercher : Alam, Kazi M.1; Rechercher : Kalra, Aarat P.1Identifiant ORCID : https://orcid.org/0000-0002-1877-0439; Rechercher : Cui, Kai1; Rechercher : Shankar, Karthik1Identifiant ORCID : https://orcid.org/0000-0001-7347-3333 |
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| Affiliation | - Conseil national de recherches du Canada. Nanotechnologie
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| Format | Texte, Article |
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| Sujet | oxides; metal nanoparticles; gold; anodization; annealing (metallurgy) |
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| Résumé | We demonstrate the formation of Ta₂O₅ nanodimple arrays on technologically relevant non-native substrates through a simple anodization and annealing process. The anodizing voltage determines the pore diameter (25–60 nm), pore depth (2–9 nm), and rate of anodization (1–2 nm/s of Ta consumed). The formation of Ta dimples after delamination of Ta₂O₅ nanotubes occurs within a range of voltages from 7 to 40 V. The conversion of dimples from Ta into Ta₂O₅ changes the morphology of the nanodimples but does not impact dimple ordering. Electron energy loss spectroscopy indicated an electronic band gap of 4.5 eV and a bulk plasmon band with a maximum of 21.5 eV. Gold nanoparticles (Au NPs) were coated on Ta₂O₅ nanodimple arrays by annealing sputtered Au thin films on Ta nanodimple arrays to simultaneously form Au NPs and convert Ta to Ta₂O₅. Au NPs produced this way showed a localized surface plasmon resonance maximum at 2.08 eV, red-shifted by ∼0.3 eV from the value in air or on SiO₂ substrates. Lumerical simulations suggest a partial embedding of the Au NPs to explain this magnitude of the red shift. The resulting plasmonic heterojunctions exhibited a significantly higher ensemble-averaged local field enhancement than Au NPs on quartz substrates and demonstrated much higher catalytic activity for the plasmon-driven photo-oxidation of p-aminothiophenol to p,p′-dimercaptoazobenzene. |
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| Date de publication | 2021-01-17 |
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| Maison d’édition | American Chemical Society |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | NRC-NANO 132 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 066a166c-6d39-4605-b038-bfa1afee171b |
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| Enregistrement créé | 2021-05-07 |
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| Enregistrement modifié | 2021-09-21 |
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