Exploration of synthesizing fluorescent silicon nanoparticles and label-free detection of sulfadiazine sodium

Orange-fluorescence carbon dots employed for the quantitative analysis of silver ions and glyphosine through the off-on mode

Here we successfully developed a kind of carbon dot (CD), which emitted obvious orange-fluorescence, based on the hydrothermal method while polyacrylic acid was employed as the carbon source. The developed CDs have been equipped with multiple functional groups such as CO, -OH and -COOH, facilitating the possibility of interacting with potential targets. Meaningfully, the introduction of silver ions induced the fluorescence quenching of the as-prepared CDs. Meanwhile, the proposed CDs achieved detection of Ag⁺ with a linear range of 2.0 × 10^-6 to 1.0 × 10^-3 M at a detection limit of 1.8 × 10^-6 M. Moreover, the further addition of glyphosine gradually recovered the fluorescence accompanied by the concentration of glyphosine varying from 7 × 10^-6 to 10^-2 M with a detection limit of 6.2 × 10^-6 M. Thereby, the CDs prepared here show potential for broadening the avenues for detecting Ag⁺ and glyphosine.