Metal-organic framework (MOF) nanosheets and covalent organic framework (COF) nanosheets as emerging porous materials nanosheets have captured increasing attention owing to their attractive properties originating from the advantages of large lateral size, ultrathin thickness, tailorable physiochemical environment, flexibility and highly accessible active sites on surface, and the applications of them have been explored in a wide range of fields. Although MOF and COF nanosheets own many similar properties, their applications in various fields show significant differences, probably due to their different compositions and bonding modes. Hence, we summarize the recent progress of MOF and COF nanosheets by comparative analysis on their advantages and limitations in synthesis and applications, providing a more profound and full-scale perspective for researchers or beginners to understand this field. Herein, the categories of preparation methods of MOF and COF nanosheets are firstly discussed, including top-down and bottom-up methods. Secondly, the applications of MOF and COF nanosheets for separation, catalysis, sensing and energy storage are summarized. Finally, based on current achievements, we put forward our personal insights into the challenges and outlooks on the synthesis, characterizations, and promising applications for future research of MOF and COF nanosheets.

金属有机骨架（MOF）纳米片和共价有机骨架（COF）纳米片作为新兴的多孔材料纳米片由于具有诱人的特性而吸引了越来越多的关注，这些特性源于大尺寸的横向尺寸，超薄的厚度，可定制的理化环境，灵活性和高度可访问性表面上的活性位点及其应用已在广泛领域中得到了探索。尽管MOF和COF纳米片具有许多相似的特性，但它们在各个领域的应用却显示出显着差异，这可能是由于其成分和键合方式不同所致。因此，我们通过比较分析MOF和COF纳米片在合成和应用中的优势和局限性，总结了MOF和COF纳米片的最新进展，为研究人员或初学者提供了更深刻和全面的视角，以了解该领域。在此，首先讨论了MOF和COF纳米片的制备方法的种类，包括自上而下和自下而上的方法。其次，总结了MOF和COF纳米片在分离，催化，传感和能量存储中的应用。最后，基于当前的成就，我们对合成，表征和在MOF和COF纳米片的未来研究中的应用前景和挑战提出了自己的见解。总结了传感和能量存储。最后，基于当前的成就，我们对合成，表征和在MOF和COF纳米片的未来研究中的应用前景和挑战提出了自己的见解。总结了传感和能量存储。最后，基于当前的成就，我们对合成，表征和在MOF和COF纳米片的未来研究中的应用前景和挑战提出了自己的见解。