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Interlayer transition in graphene carbon quantum dots

Published online by Cambridge University Press:  16 November 2020

Jorge Alberto Cuadra Aparicio ,
Hamilton Ponce  and
Carlos Rudamas
Jorge Alberto Cuadra Aparicio
Affiliation:
Universidad de El Salvador, Facultad de Ciencias Naturales y Matemáticas, Escuela de Física, Laboratorio de Espectroscopia Óptica.
Hamilton Ponce
Affiliation:
Universidad de El Salvador, Facultad de Ciencias Naturales y Matemáticas, Escuela de Física, Laboratorio de Espectroscopia Óptica.
Carlos Rudamas
Affiliation:
Universidad de El Salvador, Facultad de Ciencias Naturales y Matemáticas, Escuela de Física, Laboratorio de Espectroscopia Óptica.
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Abstract

Graphene Carbon Quantum Dots (GCQDs) are multi-layered carbon nanostructures that have attracted considerable attention due to its unique properties. Many technological applications, such as batteries, biological imaging, capacitors, solar cells, light emitting diodes, among others, could benefit from the low toxicity and the chemical and physical stability of these nanostructures. Despite much research, many optical properties, such as absorption and photoluminescence, of GCQDs are not completely understood yet. GCQD absorption spectra show a number of different bands whose origin is still on discussion. Many interpretations are made considering a single graphene layer. In this work, GCQD samples synthesized by the pyrolysis of citric acid was characterized by absorption spectroscopy measurements and Density Functional Theory simulations considering multi-layered structures. Density of States and electronic response functions calculations were also performed. From the results of these calculations, the absorption band associated to a π-π* (CC) transition could be also associated to a transition between different graphene layers.

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MRS Advances , Volume 5 , Issue 63: International Materials Research Congress XXIX , 2020 , pp. 3345 - 3352
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Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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