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The abuse of conventional antibiotics leads to increasing bacterial resistance. Nanozyme is a new kind of ultra-efficient and safe nanomaterial with intrinsic enzyme-like activities, showing remarkable potential as a next generation nanobactericide. Graphdiyne (GDY) is a burgeoning two-dimensional (2D) carbon allotrope with intriguing physicochemical properties, holding a great promise as a metal-free nanozyme. In this study, a boron doped GDY nanosheet (B-GDY) was constructed to simulate the performance of peroxidase (POD). By promoting the decomposition of H2O2 to produce reactive oxygen species (ROS), the bactericidal efficacies against both Gram-positive and Gram-negative bacteria were substantially enhanced attributed to the extremely high catalytic activity of B-GDY. In-depth density functional theory (DFT) calculations illuminate that doping of boron can introduce more active B-defect sites as well as lower Gibbs free energy during the H2O2 decomposition reaction. Notably, B-GDY contributes to significant wound healing and excellent biocompatibility, reducing the biological burden. The design of this nanozyme opens a new avenue for the development of alternative antibiotics.
The authors acknowledge Prof. Dongqin Yang (Fudan University) for kindly providing the animal experiments. Animal experiments and care were approved by the Animal Care and Use Committee of Fudan University. This work was supported by the National Natural Science Foundation of China (Nos. 31800800, 21790052, and 21501106), Natural Science Foundation of Shandong Province China (Nos. ZR2019BC101 and ZR2020MB026).