Langmuir. 2018 Jul 24;34(29):8550-8559. doi: 10.1021/acs.langmuir.8b00637. Epub 2018 Jul 11.
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 m/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.
氧化石墨烯（GO）基凝胶因其能够在三维（3D）块状材料中保留单个纳米片的特性而备受关注。这些 3D 凝胶网络的最终形态和性能强烈依赖于交联的类型和密度，并且这些凝胶可以干燥和退火，形成具有高导电性（560 S/m）和高比表面积（1700 m/g）的气凝胶。结果表明，氨含量和原始纳米片形态（褶皱与平整）对交联结构和组成有很强的影响；值得注意的是，凝胶中发现了氮，表明氨积极参与反应，而不仅仅是作为催化剂。可以使用喷雾干燥来改变 GO 纳米片的形态，以获得褶皱 GO（cGO）纳米片并形成 cGO 凝胶；这为具有可调密度、电导率和比表面积的基于 GO 的凝胶的创建提供了更多的处理方法。
