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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.13236 |
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| _version_ | 1866917170927108096 |
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| author | Martín-Sáncheza, Camino Sánchez-Iglesias, Ana Barreda-Argüeso, José Antonio Itié, Jean-Paul Chauvigne, Paul Liz-Marzán, Luis M. Rodríguez, Fernando |
| author_facet | Martín-Sáncheza, Camino Sánchez-Iglesias, Ana Barreda-Argüeso, José Antonio Itié, Jean-Paul Chauvigne, Paul Liz-Marzán, Luis M. Rodríguez, Fernando |
| contents | We report on the high-pressure optical and mechanical properties of penta-twinned gold nanoparticles (PT-AuNPs) of different geometries: decahedra, rods and bipyramids. Our results show that, unlike single-crystal (SC-AuNPs), PT-AuNPs preserve both their non-cubic crystal structures and their overall morphology up to 30 GPa. This structural integrity under compression is related to an enhanced mechanical resilience of PT-AuNPs, despite exhibiting bulk moduli comparable to those of SC-AuNPs. Notwithstanding, comparable pressure-induced localized surface plasmon resonance redshifts - for all nanoparticle geometries - were observed. Our analysis indicates that these shifts are primarily caused by changes in the refractive index of the surrounding medium, with electron density compression playing a minor role, contrasting with the behavior in SC-AuNPs, where electron density compression has a greater influence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_13236 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Penta-twinned gold nanoparticles under pressure: a comprehensive study Martín-Sáncheza, Camino Sánchez-Iglesias, Ana Barreda-Argüeso, José Antonio Itié, Jean-Paul Chauvigne, Paul Liz-Marzán, Luis M. Rodríguez, Fernando Materials Science We report on the high-pressure optical and mechanical properties of penta-twinned gold nanoparticles (PT-AuNPs) of different geometries: decahedra, rods and bipyramids. Our results show that, unlike single-crystal (SC-AuNPs), PT-AuNPs preserve both their non-cubic crystal structures and their overall morphology up to 30 GPa. This structural integrity under compression is related to an enhanced mechanical resilience of PT-AuNPs, despite exhibiting bulk moduli comparable to those of SC-AuNPs. Notwithstanding, comparable pressure-induced localized surface plasmon resonance redshifts - for all nanoparticle geometries - were observed. Our analysis indicates that these shifts are primarily caused by changes in the refractive index of the surrounding medium, with electron density compression playing a minor role, contrasting with the behavior in SC-AuNPs, where electron density compression has a greater influence. |
| title | Penta-twinned gold nanoparticles under pressure: a comprehensive study |
| topic | Materials Science |
| url | https://arxiv.org/abs/2506.13236 |