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Cuantificación de la temperatura de la superficie de las nanoestructuras termoplasmónicas

Shu Hu1, Bi-Ju Liu1, Jia-Min Feng1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (i-ChEM), The MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, Department of Chemistry, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China.

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Resumen

Este estudio introduce un nuevo método de espectroscopia de Raman mejorado en superficie para la medición precisa de la temperatura de la nanoestructura termoplasmónica. Esta técnica permite un monitoreo preciso de la temperatura de la superficie para aplicaciones en terapia fototérmica y termometría celular.

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Área de la Ciencia:

  • Nanotecnología
  • Espectroscopia
  • La biofísica

Sus antecedentes:

  • La medición precisa de la temperatura superficial de las nanoestructuras termoplasmónicas es crucial para aplicaciones como la terapia fototérmica.
  • Los métodos existentes carecen de la capacidad para la cuantificación directa de la temperatura superficial de estas nanoestructuras.

Objetivo del estudio:

  • Desarrollar un nuevo método para medir la temperatura superficial de las nanoestructuras plasmónicas utilizando la espectroscopia de Raman mejorada en la superficie.
  • Validar la precisión del método y extender su aplicación a la termometría de células vivas individuales.

Principales métodos:

  • Utilizando el cambio dependiente de la temperatura en la vibración de estiramiento de las moléculas de isocianuro de fenilo adsorbidas en nanoestructuras.
  • Utilizando la espectroscopia de Raman mejorada por superficie (SERS) para la detección sensible de la temperatura.
  • Validación del método mediante el monitoreo de la desorción inducida por láser de CO de las superficies de nanopartículas de oro.

Principales resultados:

  • Se observó un desplazamiento sensible dependiente de la temperatura de la vibración de estiramiento del fenilisocianuro (0,232 cm−1/°C), relacionado con cambios en la orientación molecular.
  • El método basado en SERS midió con precisión las temperaturas superficiales de las nanopartículas de oro durante la excitación plasmónica.
  • La técnica se aplicó con éxito para monitorear la distribución de la temperatura extracelular y los cambios de temperatura intracelular en células vivas individuales.

Conclusiones:

  • La espectroscopia de Raman mejorada con superficie ofrece un enfoque poderoso y novedoso para la medición precisa de la temperatura superficial de la nanoestructura termoplasmónica.
  • Este método proporciona una alta resolución espacial, lo que permite aplicaciones avanzadas en la termometría celular y la comprensión de los efectos térmicos en los sistemas biológicos.