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Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication

Owing to its unique properties, graphene has attracted tremendous attention in many research fields. There is a great space to develop graphene synthesis techniques by an efficient and environmentally friendly approach. In this paper, we report a facile method to synthesize well-dispersed multilayer...

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Detalles Bibliográficos
Autores principales: Lin, Zaw, Karthik, Paneer Selvam, Hada, Masaki, Nishikawa, Takeshi, Hayashi, Yasuhiko
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5485772/
https://www.ncbi.nlm.nih.gov/pubmed/28555015
http://dx.doi.org/10.3390/nano7060125
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author Lin, Zaw
Karthik, Paneer Selvam
Hada, Masaki
Nishikawa, Takeshi
Hayashi, Yasuhiko
author_facet Lin, Zaw
Karthik, Paneer Selvam
Hada, Masaki
Nishikawa, Takeshi
Hayashi, Yasuhiko
author_sort Lin, Zaw
collection PubMed
description Owing to its unique properties, graphene has attracted tremendous attention in many research fields. There is a great space to develop graphene synthesis techniques by an efficient and environmentally friendly approach. In this paper, we report a facile method to synthesize well-dispersed multilayer graphene (MLG) without using any chemical reagents or organic solvents. This was achieved by the ozone-assisted sonication of the natural graphite in a water medium. The frequency or number of ozone treatments plays an important role for the dispersion in the process. The possible mechanism of graphene exfoliation and the introduction of functional groups have been postulated. The experimental setup is unique for ozone treatment and enables the elimination of ozone off-gas. The heat generated by the dissipation of ultrasonic waves was used as it is, and no additional heat was supplied. The graphene dispersion was stable, and no evidence of aggregation was observed---even after several months. The characterization results show that well-dispersed MLG was successfully synthesized without any significant damage to the overall structure. The graphene obtained by this method has potential applications in composite materials, conductive coatings, energy storage, and electronic devices.
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spelling pubmed-54857722017-06-29 Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication Lin, Zaw Karthik, Paneer Selvam Hada, Masaki Nishikawa, Takeshi Hayashi, Yasuhiko Nanomaterials (Basel) Article Owing to its unique properties, graphene has attracted tremendous attention in many research fields. There is a great space to develop graphene synthesis techniques by an efficient and environmentally friendly approach. In this paper, we report a facile method to synthesize well-dispersed multilayer graphene (MLG) without using any chemical reagents or organic solvents. This was achieved by the ozone-assisted sonication of the natural graphite in a water medium. The frequency or number of ozone treatments plays an important role for the dispersion in the process. The possible mechanism of graphene exfoliation and the introduction of functional groups have been postulated. The experimental setup is unique for ozone treatment and enables the elimination of ozone off-gas. The heat generated by the dissipation of ultrasonic waves was used as it is, and no additional heat was supplied. The graphene dispersion was stable, and no evidence of aggregation was observed---even after several months. The characterization results show that well-dispersed MLG was successfully synthesized without any significant damage to the overall structure. The graphene obtained by this method has potential applications in composite materials, conductive coatings, energy storage, and electronic devices. MDPI 2017-05-27 /pmc/articles/PMC5485772/ /pubmed/28555015 http://dx.doi.org/10.3390/nano7060125 Text en © 2017 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lin, Zaw
Karthik, Paneer Selvam
Hada, Masaki
Nishikawa, Takeshi
Hayashi, Yasuhiko
Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication
title Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication
title_full Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication
title_fullStr Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication
title_full_unstemmed Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication
title_short Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication
title_sort simple technique of exfoliation and dispersion of multilayer graphene from natural graphite by ozone-assisted sonication
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5485772/
https://www.ncbi.nlm.nih.gov/pubmed/28555015
http://dx.doi.org/10.3390/nano7060125
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