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Nanohojas cuadradas en espiral ensambladas a partir de racimos de Ru

Haohui Hu¹, Xiao Han¹, Geng Wu¹

¹Center of Advanced Nanocatalysis, Department of Applied Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.

Journal of the American Chemical Society

|May 24, 2023

Resumen

Los investigadores desarrollaron un nuevo método utilizando la dislocación de tornillo para crear nanohojas ensambladas en espiral en 2D (CAN) a partir de racimos de rutenio (Ru). Estas nanoestructuras espirales únicas muestran un prometedor rendimiento de conversión fototérmica en la región del infrarrojo cercano.

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Área de la Ciencia:

Ciencias de los materiales
Nanotecnología
Química

Sus antecedentes:

Las nanohojas espirales bidimensionales (2D) poseen propiedades únicas debido a sus estructuras retorcidas.
La formación de estructuras jerárquicas 2D a través del autoensamblaje de clústeres es ideal, pero es un desafío para las nanohojas espirales.

Objetivo del estudio:

Informar sobre un nuevo método para sintetizar nanohojas ensambladas en espiral 2D (CAN) con morfología cuadrada uniforme.
Investigar la estructura, el montaje y las propiedades de estas nuevas nanohojas espirales.

Principales métodos:

Utilizó un método de ensamblaje con dislocación de tornillo.
Las celdas de ruenio (Ru) en espiral preparadas en 2D (aprox. 4 μm de longitud, 20,7 ± 3,0 nm de espesor por capa) de racimos de Ru de 1 a 2 nm y Pluronic F127.
Se utilizó la criomicroscopia y el HAADF-STEM para confirmar la dislocación del tornillo.
Se analizó la especiación y coordinación de los grupos utilizando la estructura fina de absorción de rayos X (XAFS).
Interacciones no covalentes investigadas (enlace de hidrógeno, interacciones hidrófilas) a través de FT-IR y RMN 1H.

Principales resultados:

Se ha sintetizado con éxito una espiral cuadrada uniforme de Ru CAN.
Confirmó la presencia de dislocación de tornillo en las estructuras espirales ensambladas.
Agrupaciones de Ru identificadas como especies Ru3+ coordinadas con Cl (número de coordinación 6.5).
Se determinó que las interacciones no covalentes impulsan el proceso de ensamblaje.
Demostró un excelente rendimiento de conversión fototérmica en la región del infrarrojo cercano (NIR).

Conclusiones:

Un nuevo método de ensamblaje que implica la dislocación del tornillo permite la formación de CAN espirales 2D.
Los CAN Ru-F127 sintetizados poseen características estructurales únicas y exhiben prometedoras capacidades de conversión fototérmica NIR.