The rapid development of flexible electronic devices, especially based on 2D materials, has triggered the demand for high-strength materials. Mono- or few-layer phosphorene with excellent electronic properties has attracted extensive attention. However, phosphorene is affected by its low Young's modulus when applied to flexible electronic devices. Here, a strategy via ion intercalation to significantly improve the mechanical properties of black phosphorus to generate hydrogen-bond-bridged phosphorene films with Young's modulus as high as 316 GPa is reported. This value is several times larger than the theoretical values of 166 GPa in the zigzag direction, 44 GPa in the armchair direction, and the averaged Young's modulus among all directions of 94 GPa. The impact of intercalation on mechanical properties is also explored. Experimental nanoindentation results obtained by atomic force microscopy indicate that the relationship between the ratio of intercalated ions to phosphorus atoms and the corresponding Young's modulus satisfies the formula . Furthermore, a flexible NO₂ gas sensor device based on this ultratough material presents excellent performance, even after 10 000 bending cycles. The results provide new insight into the potential for practical applications of black phosphorus devices.

中文翻译：

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超韧氢键桥联磷烯薄膜

柔性电子器件的快速发展，尤其是基于二维材料的电子器件，引发了对高强度材料的需求。具有优异电子性能的单层或少层磷烯引起了广泛关注。然而，磷烯在应用于柔性电子器件时会受到其低杨氏模量的影响。在这里，报道了一种通过离子插层显着提高黑磷机械性能的策略，以生成杨氏模量高达 316 GPa 的氢键桥连磷烯薄膜。该值比之字形方向的理论值 166 GPa、扶手椅方向的理论值 44 GPa 和所有方向的平均杨氏模量 94 GPa 的理论值大几倍。还探讨了插层对机械性能的影响。. 此外，基于这种超坚韧材料的柔性 NO _{2气体传感器装置即使在 10 000 次弯曲循环后也表现出优异的性能。}这些结果为黑磷器件的实际应用潜力提供了新的见解。