We show the experimental achievement of dry GO membranes with interlayer spacings in the range from 7.09 Å to 8.72 Å, tuned and fixed by salts. We found that the interlayer spacings were dominated by the anions or the groups with negative charges in between the GO membranes. Density functional theory (DFT) calculations reveal that the highly efficient tuning of the interlayer spacing in dry GO membranes is due to ion‐π interactions on the graphene sheets, together with the steric effects of anions in between the GO sheets. The findings are helpful for extending their potential applications including chemical sensors, nanomaterial devices preparation, chemical catalysis and synthesis, and gas separation.

中文翻译：

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通过离子调整干氧化石墨烯膜的层间距。

我们展示了干燥的GO膜的实验成果，该膜的层间距在7.09Å至8.72Å范围内，并通过盐调节和固定。我们发现，GO膜之间的阴离子或带有负电荷的基团决定了层间距。密度泛函理论（DFT）计算表明，干燥的GO膜中层间距的高效调节是由于石墨烯片上的离子-π相互作用以及GO片之间阴离子的空间效应。这些发现有助于扩大其潜在的应用领域，包括化学传感器，纳米材料器件的制备，化学催化和合成以及气体分离。