Synthesis of N, Zn-doped carbon dots for the detection of Fe3+ ions and bactericidal activity against Escherichia coli and Staphylococcus aureus

Publication date: Available online 6 December 2019Source: Journal of Photochemistry and Photobiology B: BiologyAuthor(s): Sai Kumar Tammina, Yang Wan, Yan Yan Li, Yaling YangAbstractA simple and one-step microwave digestion method was utilized to synthesize the highly photoluminescent glucosamine derived nitrogen and zinc doped carbon dots (N, Zn-CDs) with a bluish-green luminescence property. The synthesized N, Zn-CDs inherited a good photoluminescence property with a quantum yield of 74% and which were characterized with XPS, XRD, TEM, FT-IR, UV–Vis, and fluorescence spectrometry. More importantly N, Zn-CDs served as a fluorescence sensor for the detection of Fe3+ ions, under optimal conditions, a good linear relationship was established in the concentration range of 0.25–125 μM. Also, the experimental results showed the detection limit of N, Zn-CDs against Fe3+ was 0.15 μM, this could be a promising assay for sensing Fe3+ ions. In addition, the role of zinc doping was also explored by conducting the detection under the similar experimental conditions in the absence of zinc, reports revealed the reason for high photoluminescence was due to the zinc doping. Along with the sensing application, our group had investigated the bactericidal property of synthesized N, Zn-CDs against gram-negative (Escherichia coli) and gram-positive pathogens (Staphylococcus aureus). N, Zn-CDs displayed good bactericidal activity against both pathogens under light condition, but Escheric...
Source: Journal of Photochemistry and Photobiology B: Biology - Category: Speech-Language Pathology Source Type: research