Department of Biosciences and Bio-Medical Engineering, Indian Institute of Technology, Simrol, Khandwa Road, Indore 453552, India.
Department of Chemistry, Indian Institute of Technology, Simrol, Khandwa Road, Indore 453552, India.
J Photochem Photobiol B. 2022 Apr;229:112412. doi: 10.1016/j.jphotobiol.2022.112412. Epub 2022 Feb 18.
The zero-dimensional carbon nanostructure known as carbon dots showed attractive attributes such as multicolour emission, very high quantum yield, up-conversion, very good aqueous solubility, eco-friendliness, and excellent biocompatibility. These outstanding features of the carbon dots have raised significant interest among the research community worldwide. In the current work, water-soluble nitrogen, silver, and gold co-doped bimetallic carbon dots (BCDs) were prepared using the one-pot hydrothermal method with citric acid as a sole carbon source. As prepared BCDs showed size in the range of 4-8 nm and excitation-independent emission behaviour with maximum emission observed at 427 nm. Additionally, these BCDs showed a very high quantum yield value of 50% and fluorescence lifetime value of 10.1 ns respectively. Interestingly, as prepared BCDs selectively sense picric acid (PA) by exhibiting "selective fluorescence turn-off" behaviour in the presence of PA with a limit of detection value (LOD) of 46 nM. Further, as prepared BCDs were explored for photodynamic therapy to inactivate bacterial growth in the presence of light (400-700 nm) by generating singlet oxygen. Thus as prepared BCDs offer lots of potentials to use a nanoprobe to detect picric acid in an aqueous medium and to design next-generation antibacterial materials.
这种零维碳纳米结构被称为碳点，具有多色发射、高量子产率、上转换、良好的水溶性、环境友好性和出色的生物相容性等吸引人的特性。这些碳点的卓越特性引起了全球研究界的极大兴趣。在目前的工作中，使用柠檬酸作为唯一的碳源，通过一锅水热法制备了水溶性氮、银和金共掺杂的双金属碳点（BCDs）。所制备的 BCD 的尺寸在 4-8nm 范围内，具有与激发无关的发射行为，最大发射波长在 427nm 处。此外，这些 BCD 的量子产率值高达 50%，荧光寿命值为 10.1ns。有趣的是，所制备的 BCD 能够选择性地检测苦味酸（PA），在存在 PA 的情况下表现出“选择性荧光关闭”行为，检测限（LOD）值为 46nM。此外，所制备的 BCD 被探索用于光动力疗法，通过生成单线态氧来灭活细菌在光（400-700nm）下的生长。因此，所制备的 BCD 具有很大的潜力，可以用作纳米探针在水介质中检测苦味酸，并设计下一代抗菌材料。
