Inverted Temperature Gradients in Gold-Palladium Antenna-Reactor Nanoparticles
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913636725817344 |
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| author | Stete, Felix Kesarwani, Shivani Ruhmlieb, Charlotte Schulz, Florian Bargheer, Matias Lange, Holger |
| author_facet | Stete, Felix Kesarwani, Shivani Ruhmlieb, Charlotte Schulz, Florian Bargheer, Matias Lange, Holger |
| contents | In addition to enhanced fields and possible charge transfer, the concentration of photothermal energy at the nanoscale is a foundation of plasmon-driven photochemistry. We demonstrate a further enhancement of heat localization during the dissipation of energy in a bimetallic antenna--reactor system with palladium satellites attached to a gold nanoparticle. After pulsed excitation of the gold core, the satellites collect nearly all photothermal energy and heat up by 180\,K while the light-absorbing gold core remains much colder. By comparing transient absorption dynamics of a series of bimetallic nanoparticles with a three-temperature model, we can precisely assess the temperatures of the electronic and vibrational subsystems. We find a strong inverted temperature gradient that opposes the direction of energy input and concentrates the light energy at the active catalytic nanosite. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_02566 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Inverted Temperature Gradients in Gold-Palladium Antenna-Reactor Nanoparticles Stete, Felix Kesarwani, Shivani Ruhmlieb, Charlotte Schulz, Florian Bargheer, Matias Lange, Holger Soft Condensed Matter Materials Science Chemical Physics In addition to enhanced fields and possible charge transfer, the concentration of photothermal energy at the nanoscale is a foundation of plasmon-driven photochemistry. We demonstrate a further enhancement of heat localization during the dissipation of energy in a bimetallic antenna--reactor system with palladium satellites attached to a gold nanoparticle. After pulsed excitation of the gold core, the satellites collect nearly all photothermal energy and heat up by 180\,K while the light-absorbing gold core remains much colder. By comparing transient absorption dynamics of a series of bimetallic nanoparticles with a three-temperature model, we can precisely assess the temperatures of the electronic and vibrational subsystems. We find a strong inverted temperature gradient that opposes the direction of energy input and concentrates the light energy at the active catalytic nanosite. |
| title | Inverted Temperature Gradients in Gold-Palladium Antenna-Reactor Nanoparticles |
| topic | Soft Condensed Matter Materials Science Chemical Physics |
| url | https://arxiv.org/abs/2501.02566 |