期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
卷 229, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2022.112412
关键词
Carbon dots; Photosensitizer; Picric acid-sensing; Quantum yield; Singlet oxygen; Heteroatom doping
资金
- UGC, New Delhi
- DST-SERB for Ramanujan fellowship
- CSIR [01 (2935) /18/EMR-II]
- BRNS [58/14/17/2020-BRNS/37215]
- SERB [CRG/2020/001769]
- IIT Indore
In this study, water-soluble nitrogen, silver, and gold co-doped bimetallic carbon dots (BCDs) were successfully prepared using the one-pot hydrothermal method. The obtained BCDs exhibited excellent emission properties and high quantum yield, showing potential applications in picric acid detection and photodynamic therapy.
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.
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