Due to the increasing drug resistance of bacteria and the limitations of antibacterial nanomaterials through photodynamical and photothermal routes, it is necessary to develop novel nanomaterials with outstanding enzyme-like activities and bacteria-binding capability to produce reactive oxygen species (ROS) to kill bacteria. Herein, we report the synthesis of two kinds of Cu₉S₅ nanoflowers composed of assemblies of nanosheets, abbreviated as Cu₉S₅-1 and Cu₉S₅-2, which possess predominantly V_CuSCu and V_CuSS vacancies, respectively, as confirmed by the positron annihilation spectra. Both experimental and theoretical calculation results reveal that Cu₉S₅-2 exhibits excellent enzyme-like activities because of stronger bacteria-binding ability and higher electron affinity that endow it with a superior antibacterial activity compared to Cu₉S₅-1. This study provides a deeper understanding of nanomaterials with vacancy-type-dependent enzyme-like activities and insights for the rational design of high-performance antibacterial agents in the future.

由于细菌耐药性的增加以及抗菌纳米材料通过光动力和光热途径的局限性，有必要开发具有出色的类酶活性和细菌结合能力的新型纳米材料，以产生活性氧（ROS）来杀死细菌。在此，我们报告了两种由纳米片集合组成的 Cu ₉ S ₅纳米花的合成，缩写为 Cu ₉ S ₅ -1 和 Cu ₉ S ₅ -2，它们主要具有V _CuSCu和V _CuSS分别由正电子湮没光谱证实。实验和理论计算结果均表明，Cu ₉ S ₅ -2 表现出优异的类酶活性，因为与Cu ₉ S ₅ -1相比，它具有更强的细菌结合能力和更高的电子亲和力，使其具有优异的抗菌活性。该研究提供了对具有空位类型依赖性酶样活性的纳米材料的更深入理解，并为未来合理设计高性能抗菌剂提供了见解。