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Respuesta plasmónica a la transición de fase líquido-sólido en nanopartículas individuales de galio
Michal Horák1, Michael Foltýn1, Vojtěch Čalkovský1,2
1Central European Institute of Technology, Brno University of Technology, Purkyňova 123, Brno 612 00, Czech Republic.
The journal of physical chemistry letters
|August 21, 2025
Resumen
Las nanopartículas de galio
Área de la Ciencia:
- Las plasmónicas
- Los nanomateriales
- Química Física
Sus antecedentes:
- Las nanopartículas de galio exhiben propiedades plasmónicas sintonizables en todo el espectro UV-Vis-NIR.
- El comportamiento único de cambio de fase del galio presenta oportunidades para nuevas aplicaciones.
Objetivo del estudio:
- Investigar el impacto de la transición de la fase líquida a la sólida en los plasmónicos de nanopartículas de galio.
- Para analizar los cambios de propiedades plasmónicas a nivel de una sola partícula utilizando microscopía avanzada.
Principales métodos:
- Se empleó la microscopía electrónica de transmisión analítica (TEM).
- Las nanopartículas de galio individuales se estudiaron a través de un rango de temperaturas criogénicas.
Principales resultados:
- Transición de fase de líquido a beta-gallio observada con punto de congelación a -135 °C y punto de fusión a -20 °C.
- Se confirmó la sintonización de resonancia de plasma de superficie localizada (LSPR) a través del tamaño de UV a visible.
- Se encontraron diferencias menores en las energías LSPR entre las nanopartículas de galio líquido y sólido.
Conclusiones:
- El rendimiento de las nanopartículas de galio en los estudios plasmónicos dependientes de la temperatura no se ve afectado por el cambio de fase.
- Los hallazgos apoyan el uso de nanopartículas de galio para suprimir la recombinación no radiativa en la espectroscopia Raman criogénica mejorada por superficie (SERS).
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