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D Dispersión en banda a lo largo de nanocables orgánicos conjugados sintetizados en un semiconductor de óxido

Guillaume Vasseur^1,2, Mikel Abadia¹, Luis A Miccio^1,2

¹Centro de Física de Materiales (Consejo Superior de Investigaciones Científicas (CSIC)/Universidad del País Vasco (UPV)-Euskal Herriko Unibertsitatea (EHU)-Materials Physics Center (MPC) , Paseo Manuel Lardizabal 5, 20018 San Sebastián, Spain.

Journal of the American Chemical Society

|April 27, 2016

Resumen

Los investigadores sintetizaron cadenas de poli (p-fenileno) en el dióxido de titanio semiconductor utilizando la deshalogenación confinada en la superficie. Este avance permite la creación de nuevos dispositivos de moléculas semiconductoras en superficies de baja conductividad.

Área de la Ciencia:

Ciencias de los materiales
Química de las superficies
Nanotecnología

Sus antecedentes:

La deshalogenación confinada en la superficie permite la síntesis de abajo hacia arriba de nanoestructuras de carbono.
Los métodos actuales requieren superficies metálicas, lo que limita las aplicaciones en sustratos de baja conductividad.

Objetivo del estudio:

Para sintetizar cadenas ordenadas de poli (p-fenileno) en el semiconductor TiO2 (p-fenileno).
Demostrar la viabilidad de sintetizar nanoestructuras de carbono en superficies de óxido de metales de transición.

Principales métodos:

El acoplamiento homoalogenativo de los precursores de 4,4′′-dibromoterfenilo.
Difracción de electrones de baja energía (LEED) y microscopía de túnel de barrido (STM) para la identificación de fases.
Espectroscopia de fotoelectrones de rayos X (XPS) y espectroscopia de fotoemisión con resolución de ángulo (ARPES) para la caracterización química y electrónica.

Principales resultados:

Las matrices ordenadas de cadenas de poli (p-fenileno) se sintetizaron con éxito en TiO2 (p-fenileno).
La distinción entre las fases supramolecular y polimérica se logró variando la temperatura del sustrato.
El inicio de la deshalogenación se observó alrededor de 475 K.
La evidencia espectroscópica confirmó la polimerización exitosa a través de bandas altamente dispersivas.

Conclusiones:

Las nanoestructuras basadas en carbono atómicamente precisas se pueden sintetizar en superficies de óxido de metal de transición.
Esto abre perspectivas para la producción ascendente de nuevos dispositivos de semiconductores moleculares.

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