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Estimation of Number of Graphene Layers Using Different Methods: A Focused Review

Graphene, a two-dimensional nanosheet, is composed of carbon species (sp(2) hybridized carbon atoms) and is the center of attention for researchers due to its extraordinary physicochemical (e.g., optical transparency, electrical, thermal conductivity, and mechanical) properties. Graphene can be synt...

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Autores principales: Kumar, Vineet, Kumar, Anuj, Lee, Dong-Joo, Park, Sang-Shin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8399741/
https://www.ncbi.nlm.nih.gov/pubmed/34443113
http://dx.doi.org/10.3390/ma14164590
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author Kumar, Vineet
Kumar, Anuj
Lee, Dong-Joo
Park, Sang-Shin
author_facet Kumar, Vineet
Kumar, Anuj
Lee, Dong-Joo
Park, Sang-Shin
author_sort Kumar, Vineet
collection PubMed
description Graphene, a two-dimensional nanosheet, is composed of carbon species (sp(2) hybridized carbon atoms) and is the center of attention for researchers due to its extraordinary physicochemical (e.g., optical transparency, electrical, thermal conductivity, and mechanical) properties. Graphene can be synthesized using top-down or bottom-up approaches and is used in the electronics and medical (e.g., drug delivery, tissue engineering, biosensors) fields as well as in photovoltaic systems. However, the mass production of graphene and the means of transferring monolayer graphene for commercial purposes are still under investigation. When graphene layers are stacked as flakes, they have substantial impacts on the properties of graphene-based materials, and the layering of graphene obtained using different approaches varies. The determination of number of graphene layers is very important since the properties exhibited by monolayer graphene decrease as the number of graphene layer per flake increases to 5 as few-layer graphene, 10 as multilayer graphene, and more than 10 layers, when it behaves like bulk graphite. Thus, this review summarizes graphene developments and production. In addition, the efficacies of determining the number of graphene layers using various characterization methods (e.g., transmission electron microscopy (TEM), atomic force microscopy (AFM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra and mapping, and spin hall effect-based methods) are compared. Among these methods, TEM and Raman spectra were found to be most promising to determine number of graphene layers and their stacking order.
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spelling pubmed-83997412021-08-29 Estimation of Number of Graphene Layers Using Different Methods: A Focused Review Kumar, Vineet Kumar, Anuj Lee, Dong-Joo Park, Sang-Shin Materials (Basel) Review Graphene, a two-dimensional nanosheet, is composed of carbon species (sp(2) hybridized carbon atoms) and is the center of attention for researchers due to its extraordinary physicochemical (e.g., optical transparency, electrical, thermal conductivity, and mechanical) properties. Graphene can be synthesized using top-down or bottom-up approaches and is used in the electronics and medical (e.g., drug delivery, tissue engineering, biosensors) fields as well as in photovoltaic systems. However, the mass production of graphene and the means of transferring monolayer graphene for commercial purposes are still under investigation. When graphene layers are stacked as flakes, they have substantial impacts on the properties of graphene-based materials, and the layering of graphene obtained using different approaches varies. The determination of number of graphene layers is very important since the properties exhibited by monolayer graphene decrease as the number of graphene layer per flake increases to 5 as few-layer graphene, 10 as multilayer graphene, and more than 10 layers, when it behaves like bulk graphite. Thus, this review summarizes graphene developments and production. In addition, the efficacies of determining the number of graphene layers using various characterization methods (e.g., transmission electron microscopy (TEM), atomic force microscopy (AFM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra and mapping, and spin hall effect-based methods) are compared. Among these methods, TEM and Raman spectra were found to be most promising to determine number of graphene layers and their stacking order. MDPI 2021-08-16 /pmc/articles/PMC8399741/ /pubmed/34443113 http://dx.doi.org/10.3390/ma14164590 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Review
Kumar, Vineet
Kumar, Anuj
Lee, Dong-Joo
Park, Sang-Shin
Estimation of Number of Graphene Layers Using Different Methods: A Focused Review
title Estimation of Number of Graphene Layers Using Different Methods: A Focused Review
title_full Estimation of Number of Graphene Layers Using Different Methods: A Focused Review
title_fullStr Estimation of Number of Graphene Layers Using Different Methods: A Focused Review
title_full_unstemmed Estimation of Number of Graphene Layers Using Different Methods: A Focused Review
title_short Estimation of Number of Graphene Layers Using Different Methods: A Focused Review
title_sort estimation of number of graphene layers using different methods: a focused review
topic Review
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8399741/
https://www.ncbi.nlm.nih.gov/pubmed/34443113
http://dx.doi.org/10.3390/ma14164590
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