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Nanocristales de oro dodecaédricos: la forma platónica que faltaba.

Wenxin Niu1, Weiqing Zhang, Shaik Firdoz

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore , 4 Engineering Drive 4, Singapore 117585.

Journal of the American Chemical Society
|February 18, 2014
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Los investigadores sintetizaron nanocristales de oro dodecaédricos platónicos (Au NC) utilizando un nuevo enfoque mediado por semillas. Este avance permite la creación de esquivas formas dodecaédricas, ampliando las posibilidades para aplicaciones de nanomateriales.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Nanotecnología La nanotecnología es la nanotecnología.
  • Química Química es la química.

Sus antecedentes:

  • Los nanocristales de metales nobles platónicos (NC) se valoran por su simetría y aplicaciones en catálisis, plasmónica, detección y espectroscopia.
  • Se establece la síntesis de las NC tetraédricas, cúbicas, octaédricas e icosaédricas, pero las formas dodecaédricas siguen siendo un desafío.

Objetivo del estudio:

  • Proponer una estructura cristalina para los metales nobles dodecaédricos platónicos NCs.
  • Desarrollar un método sintético para la producción de oro dodecaédrico (Au) NCs.
  • Para explorar el control de la forma de Au NCs con simetría icosaédrica (Ih).

Principales métodos:

  • Se empleó un enfoque sintético a medida mediado por semillas.
  • Como punto de partida se utilizaron semillas Au icosaédricas multiplicadas y gemelas.
  • Se realizó un ajuste sistemático de la relación entre las facetas {111} y {110}.

Principales resultados:

  • Las Au NC dodecaédricas platónicas se han cultivado con éxito a partir de semillas Au icosaédricas.
  • Se obtuvieron NC con formas icosaédricas, icosidodecaédricas y dodecaédricas.
  • Se demostró una familia de Au NCs que exhiben simetría icosaédrica (Ih).

Conclusiones:

  • La estructura cristalina propuesta para las NC dodecaédricas está validada por síntesis.
  • El enfoque mediado por semillas ofrece control sobre la forma y simetría de la NC.
  • Este trabajo abre nuevas vías para el diseño de NC de metales nobles con geometrías platónicas específicas.