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Hot carrier photocatalysis using bimetallic Au@Pt hemispherical core–shell nanoislands

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Abstract

We report the fabrication of core–shell Au@Pt nanoislands grown on glass substrates using a facile and reproducible combination of magnetron sputtering and thermal annealing. Au@Pt NPs exhibit a lattice strain of ~ 0.2% and a slightly positively charged Au core due to electron transfer from Au to Pt during equilibration. The localized surface plasmon resonance peak of Au redshifts incrementally from 2.13 to 2.0 eV and broadens in a controllable manner with the addition of ultrathin Pt shells (1–3 nm). This has been linked to the hemispherical morphology of the nanoislands and the high index glass substrate with subsequent resonance peak broadening as a consequence of the high annealing temperatures utilized. The quality factor of the LSPR resonance decreased gradually from ~ 13 to ~ 3 as bare Au nanoislands were coated with 3 nm of Pt. The Au@Pt nanoislands demonstrated superior methylene blue degradation performance (up to efficiencies of 31%) due to the hot hole injection from the bimetallic nanoparticle into the dye molecule despite the absence of any semiconducting photocatalytic support. Raman thermometry studies involving Stokes and anti-Stokes spectra helped shed light on the hot electron dynamics of the composite system and validated hot carrier injection from Au to Pt.

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Acknowledgements

This research was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC), Future Energy Systems (FES) CFREF, and the National Research Council – National Institute for Nanotechnology (NRC-NINT).

Author information

Author notes

  1. Pawan Kumar

    Present address: Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive, NW, Calgary, AB, Canada

Authors and Affiliations

  1. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, T6G 1H9, Canada

    Ajay P. Manuel, Saralyn Riddell, Harshitha Rajashekhar, Damini Vrushabendrakumar, Kazi M. Alam, Pawan Kumar & Karthik Shankar

  2. Nanotechnology Research Center, National Research Council Canada, 11421 Saskatchewan Drive, Edmonton, AB, T6G 2M9, Canada

    Kazi M. Alam, Sergey Gusarov & Alexander E. Kobryn

  3. Department of Chemistry, University of Alberta, Edmonton, AB, T6G 2G2, Canada

    Mustafa Supur & Richard L. McCreery

Authors
  1. Ajay P. Manuel
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  2. Saralyn Riddell
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  3. Harshitha Rajashekhar
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  4. Damini Vrushabendrakumar
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  5. Kazi M. Alam
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  6. Pawan Kumar
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  7. Sergey Gusarov
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  8. Alexander E. Kobryn
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  9. Mustafa Supur
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  10. Richard L. McCreery
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  11. Karthik Shankar
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Contributions

APM: Conceptualization, Methodology, Formal analysis, Investigation, Writing—Original Draft, Visualization. SR: Methodology, Investigation. HR: Methodology, Formal analysis, Investigation, Writing—Original Draft. DV: Methodology, Formal analysis, Investigation. KMA: Methodology, Formal analysis, Investigation, Writing—Original Draft, Visualization. PK: Formal analysis, Investigation, Writing—Original Draft, Review & Editing. SG: Methodology, Investigation, Supervision, Project administration, Funding acquisition. AEK: Methodology, Investigation, Supervision, Investigation, Visualization. MS: Methodology. RLM: Supervision, Resources. KS: Supervision, Project administration, Methodology, Investigation, Writing—Review & Editing, Funding acquisition, Resources.

Corresponding author

Correspondence to Karthik Shankar.

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Manuel, A.P., Riddell, S., Rajashekhar, H. et al. Hot carrier photocatalysis using bimetallic Au@Pt hemispherical core–shell nanoislands. J Mater Sci: Mater Electron 33, 18134–18155 (2022). https://doi.org/10.1007/s10854-022-08671-2

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  • DOI: https://doi.org/10.1007/s10854-022-08671-2

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