A method for green synthesis of sulfur, nitrogen co-doped photoluminescence carbon dots (S,N/CDs) originating from two natural biomass was proposed. By simple hydrothermal heating of bean pod and onion, blue emission CDs were prepared. Ag can effectively quench the as-prepared S,N/CDs. Under optimized conditions, the linear range of the established method for Ag detection was 0.1-25 μM, and the detection of limit based on 3S/N was 37 nM. More interestingly, the addition of Ag can induce an evident color change of S,N/CDs from yellow to brown under sunlight. The developed method was applied for detection of Ag in river water and tap water samples. Satisfied recoveries ranging from 96.0 to 102.0% with precision below 4.1% were obtained. S,N/CDs showed low toxicity toward 4T1 cells, which also can be extended to cellular imaging and intracellular Ag detection. The simple and green approach proposed here could meet the requirements for bioimaging and environmental monitoring.
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| http://dx.doi.org/10.1021/acsomega.9b03198 | DOI Listing |
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