| Alternative title | 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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| Download | - View final version: 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 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1021/acsami.0c18580 |
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| Author | Search for: Kisslinger, Ryan1ORCID identifier: https://orcid.org/0000-0003-2456-396X; Search for: Riddell, Saralyn; Search for: Manuel, Ajay P.1; Search for: Alam, Kazi M.1; Search for: Kalra, Aarat P.1ORCID identifier: https://orcid.org/0000-0002-1877-0439; Search for: Cui, Kai1; Search for: Shankar, Karthik1ORCID identifier: https://orcid.org/0000-0001-7347-3333 |
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| Affiliation | - National Research Council of Canada. Nanotechnology
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| Format | Text, Article |
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| Subject | oxides; metal nanoparticles; gold; anodization; annealing (metallurgy) |
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| Abstract | 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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| Publication date | 2021-01-17 |
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| Publisher | American Chemical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRC-NANO 132 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 066a166c-6d39-4605-b038-bfa1afee171b |
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| Record created | 2021-05-07 |
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| Record modified | 2021-09-21 |
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