After the discovery of sp²-hybridized graphene and even lighter borophene, the scientific quest for the thinnest metallic sheets prompts the discovery of beryllene. As beryllium lacks p-electrons, the hybridization and structural evolution of beryllene in determining electronic/excitonic behaviors are scientifically interesting. Herein, we report the experimental realization of freestanding flat beryllene sheets with a lateral dimension of ~0.2–4 μm via sonochemical exfoliation. High-resolution transmission electron microscopy establishes the existence of hexagonal, square and stripe crystallographic phases. While characteristic Raman fingerprints ~451 and ~614 cm⁻¹, and experimentally observed electrically metallic nature of beryllene (vindicated by density-functional-theory band structure calculations) establish beryllene synthesis. Room temperature magnetism in Be-G and Be-CNT hybrids (established by Raman mapping and magnetic force microscopic imaging) is an interesting finding. Beryllene was explored as a surface-enhanced Raman spectroscopy (SERS) anchor in molecular sensing, oxidation-resistant, and fire-resistant laminates. It is believed that the discovery of beryllene will lead to novel functionalities and emerging applications.

在发现 sp ²杂化石墨烯和更轻的硼烯之后，对最薄金属片的科学探索促使了铍烯的发现。由于铍缺乏 p 电子，铍的杂化和结构演化在确定电子/激子行为方面具有科学意义。在此，我们报告了通过声化学剥离实验实现了横向尺寸约为 0.2-4 μm 的独立式扁平铍片。高分辨率透射电子显微镜证实了六方晶相、方形晶相和条纹晶相的存在。而特征拉曼指纹〜451和〜614 cm ^-1，并通过实验观察到铍的电金属性质（通过密度泛函理论能带结构计算证明）建立了铍的合成。Be-G 和 Be-CNT 混合物中的室温磁性（通过拉曼图谱和磁力显微成像建立）是一个有趣的发现。铍烯被探索作为分子传感、抗氧化和防火层压板中的表面增强拉曼光谱 (SERS) 锚。据信，铍的发现将带来新的功能和新兴的应用。