Graphene oxide (GO)-based gels are attractive because of their ability to retain individual nanosheet properties in a three-dimensional (3D) bulk material. The final morphology and properties of these 3D gel networks depend strongly on the type and density of cross-links, and these gels can be dried and annealed to form aerogels with both high conductivity (560 S/m) and high surface area (1700 m²/g). The results show that both ammonia content and the parent nanosheet morphology (crumpled vs flat) have a strong influence on the cross-linked structure and composition; notably, nitrogen is found in the gels, suggesting that ammonia actively participates in the reaction rather than as a mere catalyst. The GO nanosheet morphology may be altered using spray-drying to obtain crumpled GO (cGO) nanosheets and form cGO gels; this allows for an additional handle in the creation of GO-based gels with tunable density, electrical conductivity, and surface area.

中文翻译：

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石墨烯氧化物凝胶中的定制网络形成

基于氧化石墨烯（GO）的凝胶之所以具有吸引力，是因为它们能够在三维（3D）块状材料中保留单个纳米片的性能。这些3D凝胶网络的最终形态和性能在很大程度上取决于交联的类型和密度，并且可以将这些凝胶干燥并退火以形成具有高电导率（560 S / m）和高表面积（1700 m）的气凝胶。^2个/G）。结果表明，氨含量和母体纳米片的形态（压扁与平整）都对交联结构和组成有很大影响。值得注意的是，在凝胶中发现了氮，这表明氨积极地参与了反应，而不仅仅是作为催化剂。可使用喷雾干燥法改变GO纳米片的形貌，以获得皱缩的GO（cGO）纳米片并形成cGO凝胶。这为创建具有可调密度，电导率和表面积的GO型凝胶提供了额外的便利。