We have successfully achieved selective and efficient functionalization of sheet edges in microcrystalline multilayer γ-graphyne through two methods: cross-coupling with residual bromide edge groups and copper-catalyzed azide–alkyne cycloaddition (CuAAC) with edge terminal alkyne groups. This modification significantly enhances the ease of mechanical exfoliation and dispersibility of the sheets of γ-graphyne. Specifically, C₁₈-grafted γ-graphyne forms stable dispersions in compatible organic solvents, allowing for the imaging of atomically thin layers of γ-graphyne for the first time. Additionally, we have discovered that phenylacetylide edge groups alter the preferred stacking mode of γ-graphyne sheets. Few-layer flakes of Ph-edge γ-graphyne exhibit a preference for the R3m space group, contrasting with the aperiodic stacking of Br-edge γ-graphyne. These results open the door for scalable exfoliation of few-layer flakes of γ-graphyne with a high aspect ratio, enabling potential applications in carbon electronics.

中文翻译：

---

块状 γ-石墨炔的边缘功能化促进机械剥离并调节片材堆叠模式

我们通过两种方法成功实现了微晶多层γ-石墨烯片材边缘的选择性和高效功能化：与残留溴化物边缘基团的交叉偶联和带有边缘末端炔基的铜催化叠氮-炔环加成（CuAAC）。这种改性显着增强了 γ-石墨烯片材的机械剥离性和分散性。具体来说，C ₁₈接枝的γ-石墨烯在相容的有机溶剂中形成稳定的分散体，首次允许对γ-石墨烯的原子薄层进行成像。此外，我们发现苯乙炔边缘基团改变了γ-石墨烯片的优选堆叠模式。与 Br 边 γ-石墨烯的非周期堆积相比，Ph 边 γ-石墨烯的少层薄片表现出对R 3 m空间群的偏好。这些结果为具有高纵横比的几层γ-石墨烯薄片的可扩展剥离打开了大门，从而实现了在碳电子学中的潜在应用。