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首页> 外文期刊>ACS applied materials & interfaces >Tailoring Graphene Nanosheets for Highly Improved Dispersion Stability and Quantitative Assessment in Nonaqueous Solvent
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Tailoring Graphene Nanosheets for Highly Improved Dispersion Stability and Quantitative Assessment in Nonaqueous Solvent

机译：量身定制石墨烯纳米片，以提高非水溶剂中的分散稳定性和定量评估

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Aggregation is a critical limitation for the practical application of graphene-based materials. Herein, we report that graphene oxide (GO) nanosheets chemically modified with ethanolamine (EA), ethylene glycol (EG), and sulfanilic acid (SA) demonstrate superior dispersion stability in organic solvents, specifically EG, based on the differences in their covalent chemistries. Functionalized GO was successfully dispersed in EG at a concentration of 9.0 mg mL(-1) (0.50 vol %), the highest dispersion concentration reported to date. Moreover, our study introduces a unique analytical method for the assessment of dispersion stability and successfully quantifies the instability index based on transmission profiles under centrifugation cycles. Interestingly, GO-EG and GO-EA exhibited highly improved dispersion stabilities approximately 96 and 48 times greater than that of GO in EG solvent, respectively. This finding highlights the critical role of surface functional groups in the enhancement of chemical affinity and miscibility in the surrounding media. We anticipate that the novel structural designs and unique tools presented in this study will further the understanding and application of chemically functionalized carbon materials.
机译：聚集是石墨烯基材料实际应用的关键限制。本文中，我们报道了基于乙醇胺（EA），乙二醇（EG）和磺胺酸（SA）进行化学修饰的氧化石墨烯（GO）纳米片，基于其共价化学性质的差异，在有机溶剂（特别是EG）中显示出优异的分散稳定性。 。功能化的GO成功地以9.0 mg mL（-1）（0.50 vol％）的浓度分散在EG中，这是迄今为止报道的最高分散浓度。此外，我们的研究引入了一种独特的分析方法来评估分散体的稳定性，并根据离心循环下的传输曲线成功地量化了不稳定性指数。有趣的是，GO-EG和GO-EA分别显示出比GO在EG溶剂中高出约96和48倍的分散稳定性。这一发现突出了表面官能团在增强周围介质的化学亲和力和可混溶性方面的关键作用。我们预计本研究中提出的新颖的结构设计和独特的工具将进一步理解和应用化学功能化的碳材料。

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