Two-dimensional (2D) materials such as graphene, MXenes, and transition-metal dichalcogenides have recently gained substantial attention for their superlative physicochemical properties. Assembling 2D materials into functional composites is of great importance, which could be the key to breakthroughs in emerging technologies and applications. The layer-by-layer assembly technique is a powerful, versatile, facile, and potentially highly scalable processing tool that has successfully been demonstrated to bring unique materials system advantages to various fields such as energy storage, chemical sensors, nanofiltration membranes, and solar cells. The wide range of precursors (e.g., polyelectrolytes) and tuning parameters that facilitate the incorporation of nanostructured materials makes this technique particularly compelling for creating 2D-material-based composites with ordered structure and tunable material properties. In this review, we highlight the exciting works in the field that utilize 2D materials implemented in layer-by-layer assembled composites. We also discuss the challenges and opportunities toward industrialization of layer-by-layer assembled composites with perspectives on future research directions.

二维（2D）材料（例如石墨烯，MXenes和过渡金属二卤化碳）最近因其最优异的物理化学特性而受到广泛关注。将2D材料组装成功能复合材料非常重要，这可能是新兴技术和应用突破的关键。逐层组装技术是一种功能强大，用途广泛，轻便且具有高度可扩展性的加工工具，已成功证明其可将独特的材料系统优势带入各个领域，例如储能，化学传感器，纳滤膜和太阳能电池。各种各样的前体（例如，聚电解质）和有助于纳入纳米结构材料的调整参数，使得该技术特别有吸引力，可用于创建具有有序结构和可调材料特性的基于2D材料的复合材料。在这篇评论中，我们重点介绍了利用在逐层组装的复合材料中实现的2D材料在该领域中令人兴奋的作品。我们还讨论了未来研究方向的观点，探讨了层状组装复合材料工业化的挑战和机遇。