Stacking-configuration-preserved Graphene quantum dots electrochemically obtained from CVD Graphene

Barrionuevo, Santiago D. ; Fioravanti, Federico ; Núñez, Jorge M. ; Muñeton Arboleda, David ; Lacconi, Gabriela I. ; Bellino, Martín G. ; Aguirre, Myriam H. (Universidad de Zaragoza) ; Ibáñez, Francisco J.

Resumen: The layer stacking morphology in nanocarbons is paramount for achieving new properties and outperforming applications. Here, we demonstrate that graphene quantum dots (GQDs) retain crystallinity and a stacking structure from CVD graphene grown on Ni foam. Our results reveal that GQD subdomains comprise a few-layer graphene structure in the AB···AB and ABC···ABC stacking configuration. HR-TEM images along with a multiple-approach characterization (XRD, XPS, UV–vis, AFM, and ATR-IR) exhibit ∼3.0 to ∼8.0 nm crystalline GQDs with 2–6 graphene layers thick indicating a disk-shape structure. The UV–vis profiles show changes in color of the dispersion (from colorless to red) during and after the electrochemistry, suggesting a systematic electrooxidation of graphene into smaller, highly crystalline, and more complex sp2/sp3 structures. Importantly, a control experiment performed under the same conditions but with a graphitic rod exhibited large, polydisperse, and multilayer carbon structures. This work demonstrates a relatively easy electrochemical synthesis to obtain GQDs which retain the pristine and, in turn, distinctive structure of graphene grown on Ni foam.

Idioma: Inglés

DOI: 10.1021/acs.jpcc.3c06871

Año: 2024

Publicado en: Journal of physical chemistry. C. 128, 3 (2024), 1393-1403
ISSN: 1932-7447

Financiación: info:eu-repo/grantAgreement/EC/H2020/101007825/EU/ULtra ThIn MAgneto Thermal sEnsor-Ing/ULTIMATE-I
Financiación: info:eu-repo/grantAgreement/EC/H2020/872631 /EU/Memristive and multiferroic materials for emergent logic units in nanoelectronics/MELON

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)