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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Imágenes de difusión de isótopos mediante espectroscopia vibratoria a escala atómica

Ryosuke Senga1, Yung-Chang Lin2, Shigeyuki Morishita3

  • 1Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan. ryosuke-senga@aist.go.jp.

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|March 3, 2022
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Resumen

Este estudio demuestra imágenes isotópicas a nivel atómico en grafeno utilizando espectroscopia vibratoria. La técnica rastreó con éxito la auto-difusión del átomo de carbono, allanando el camino para la ingeniería de isótopos a nanoescala.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Nanotecnología
  • Espectroscopia

Sus antecedentes:

  • Los métodos actuales de análisis de isótopos tienen una resolución espacial limitada (cientos de nanómetros).
  • La detección de isótopos a nivel atómico ha sido un desafío significativo.
  • La espectroscopia vibratoria con sondas de electrones ofrece una mayor resolución, pero carece de detección isotópica a nivel atómico.

Objetivo del estudio:

  • Para lograr imágenes isotópicas inequívocas a nivel atómico.
  • Para monitorear la auto-difusión de los isótopos de carbono en el grafeno.
  • Establecer una nueva metodología para la ingeniería y el rastreo de nanoisótopos.

Principales métodos:

  • Crece un dominio de átomos de carbono-12 (12C) dentro del grafeno de carbono-13 (13C).
  • El recocido de la muestra a 600 °C para facilitar la difusión.
  • Utilizando microscopía electrónica de transmisión de barrido-espectroscopia de pérdida de energía electrónica (STEM-EELS) para el mapeo isotópico.

Principales resultados:

  • Se obtuvo una imagen isotópica inequívoca de los átomos de 12C en el grafeno 13C.
  • Se observó una rápida difusión y segregación de átomos de 12C.
  • El grafeno se volvió isotópicamente homogéneo en regiones de 100 nanómetros en 2 horas, lo que indica una alta movilidad del átomo de carbono.

Conclusiones:

  • La espectroscopia vibratoria a nivel atómico permite imágenes isotópicas precisas y monitoreo de difusión.
  • Los hallazgos destacan la alta movilidad de los átomos de carbono en el grafeno a través de la auto-difusión.
  • Esta técnica proporciona una herramienta fundamental para la ingeniería, el etiquetado y el rastreo de isótopos a nanoescala.