期刊
NANOSCALE
卷 14, 期 22, 页码 8183-8191出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nr01550a
关键词
-
类别
资金
- National Natural Science Foundation of China [21908121, 22071127]
- Taishan Scholar Foundation (China) [tsqn201812074]
- Natural Science Foundation of Shandong Province (China) [ZR2019YQ07]
- Scientific Research Foundation of Qingdao University of Science and Technology [210/010029031, 210/010029008]
This study presents the design of a visible-light-driven photodynamic antibacterial agent based on the conjugation of aggregation-induced emission (AIE)-featured AuAg nanoclusters (NCs) with highly luminescent carbon dots (CDs). The conjugation enhances visible-light harvest and promotes charge carrier generation/separation, resulting in the production of abundant reactive oxygen species (ROS) for bacterial killing. The obtained CDs@AuAg NCs exhibit excellent photodynamic antibacterial activity with negligible cytotoxicity.
Metal nanoclusters (NCs) have emerged as novel antibacterial agents featuring broad-spectrum antibacterial activity without drug resistance for bacteria, but suffer from fast antibacterial invalidation due to their consumption by bacteria. Herein we report the design of a visible-light-driven photodynamic antibacterial agent based on conjugating aggregation-induced emission (AIE)-featured AuAg NCs with highly luminescent carbon dots (CDs). The conjugation of CDs with AuAg NCs could not only enhance the visible-light harvest, but also promote charge carrier generation/separation via charge/energy transfer, leading to the production of abundant reactive oxygen species (ROS) for bacterial killing under visible-light irradiation. Consequently, the as-obtained CDs@AuAg NCs display excellent photodynamic antibacterial activity against both Gram-positive and Gram-negative bacteria with 4-5 orders of magnitude reduction in colony forming units, which is different from the conventional metal NC-based analogue relying on self-consumption for bacterial killing. In addition, the CDs@AuAg NCs are found to be free of cytotoxicity; the ROS capture experiments indicate that the photoproduced H2O2 by CDs@AuAg NCs is the main active species for bacterial killing, accounting for nearly 48% of the total antibacterial efficacy. This study provides a paradigm for the design of metal NC-based photodynamic antibacterial agents for diverse bactericidal applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据