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عنوان فارسی مقاله:
سوسپانسیون گرافون چند لایه بسیار متمرکز و پایدار در حلال های آلی خالص و فرار
عنوان انگلیسی مقاله:
Highly concentrated and stable few-layers graphene suspensions in pure and volatile organic solvents
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Graphene has attracted much attention as a new nano-carbon form with a unique structure and exceptional physical properties [1]. Commercial applications for graphene are expected in many areas from high-frequency electronics [2] to smart coatings [3]. While some of those applications will require coverage of large areas with single layer graphene of high structural quality, many others such as printed electronics [4], transparent electrodes [5] or conductive coatings [6] will demand low-cost graphene suspensions able to be processed by simple methods in large quantities and in a wide range of media. In this context, liquid phase exfoliation (LPE) of graphite is expected to fill this gap [7,8]. However, the preparation of graphene suspensions is still very limited. Probably the most promising LPE procedure is based on the graphite exfoliation using N-methyl-2-pyrrolidone (NMP) as solvent [9]. Despite having high quality graphene layers in graphene-NMP suspensions, the stability of the suspensions and even industrial scale-up [10], are the main drawbacks due to the features of NMP, which is a non-green solvent [11] with a high boilingpoint that may prevent the processability of the graphene suspensions. Therefore, it seems obvious the need for the search of alternative solvents that could overcome these features. Following this idea, graphene dispersions in high boiling point solvents have been successfully transferred into volatile solvents by solvent exchange. However, these procedures yield to low concentration graphene suspensions [12]. In addition, a direct method based on sonication at very low power during long time of graphite in choloroform or isopropanol has allowed the formation of stable graphene suspensions with high graphene concentration [13]. Despite this interesting result, the long sonication time required to obtain the mentioned graphene suspensions limited the scalability of the process. Finally, recent reports showed the possibility of use mixtures acetone/water [14] and ethanol/water in graphite liquid phase exfoliation [15–17]. In a different approach, graphene suspensions have been obtained by reducing graphene oxide suspensions [18]. Although interesting, this is a not desirable strategy from different perspectives. In one hand, the atom economy of this approach is quite low which has a negative impact both environmentally and economically. On the other hand, commonly the physical properties of graphene are not completely restored after reduction of graphene oxide due to the defects produced in the chemical manipulation that results in a low quality graphene [19]. Thus, it is convenient to distinguish clearly those methods based on graphene oxide reduction and those that imply direct graphiteexfoliation, which up to this date implied the use of a limited number of solvents and working conditions that hampered its massive application. In this work we have produced, by a simple two-steps procedure, graphene powders readily re-dispersable in water-free volatile organic solvents such as ethanol, tetrahydrofurane, chloroform, acetone or toluene. These graphene powders offer an unprecedented tool to obtain highly concentrated few-layers graphene suspensions in a wide range of organic solvents. The stability of these suspensions vs time has been evaluated showing an excellent performance.As a proof-of-concept ofthe potential applications of these suspensions, spray-on technique has been used to prepare transparent and conductive glasses.
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کلمات کلیدی:
Highly concentrated and stable few-layers graphene ... - CiteWeb citeweb.info/20161103825 Autors: Mohammad-Reza Azani; Azin Hassanpour; V. Carcelen; Carlos Gibaja; Daniel Granados; Rubén Mas-Ballesté; Félix Zamora. CiteWeb id: 20161103825. High stability of few layer graphene nanoplatelets in various solvents ... iopscience.iop.org/article/10.1088/1757-899X/191/1/012015 by X Xu - 2017 High stability of few layer graphene nanoplatelets in various solvents. X Xu1, J ... High-concentration suspensions using our facile dispersion method could be of ... Environmental Synthesis of Few Layers Graphene Sheets ... - PLOS journals.plos.org/plosone/article?id=10.1371/journal.pone.0152699 by M Noroozi - 2016 - Cited by 4 - Related articles Apr 11, 2016 - High concentration and stable few-layer graphene dispersions prepared by the exfoliation of graphite in different organic solvents. Production of High-Concentration Graphene Dispersions in Low ... pubs.acs.org/doi/abs/10.1021/jp4008009 by L Xu - 2013 - Cited by 47 - Related articles Apr 26, 2013 - High-concentration graphene dispersion stabilized by block copolymers in ... Liquid-Phase Exfoliation of Few-Layer Graphene and Effect of ... Solvent-Exfoliated Graphene at Extremely High Concentration ... pubs.acs.org/doi/abs/10.1021/la201797h?src=recsys Jun 15, 2011 - Solvent-Exfoliated Graphene at Extremely High Concentration ...... High concentration and stable few-layer graphene dispersions prepared by ... Environmental Synthesis of Few Layers Graphene ... - NCBI - NIH https://www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC) by M Noroozi - 2016 - Cited by 4 - Related articles Apr 11, 2016 - In this paper, we report how few layers graphene that can be produced in ... Additionally, concentrated acids are needed in oxidisation and the harsh ... that could disperse highly stable graphene sheets in large quantities. High yield production and purification of few layer graphene by Gum ... www.nature.com › Scientific Reports › Articles by V Chabot - 2013 - Cited by 82 - Related articles Mar 12, 2013 - High yield production and purification of few layer graphene by Gum Arabic assisted ... Further, the multistep process, the concentrated acids used in ... GA has been used to debundle SWNT in solution, forming stable ink ...
