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N,S,P Co-Doped Carbon Nanodot Fabricated from Waste Microorganism and Its Application for Label-Free Recognition of Manganese(VII) and l‑Ascorbic Acid and AND Logic Gate Operation

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journal contribution
posted on 12.10.2017, 00:00 by Xiaojuan Gong, Zengbo Li, Qin Hu, Ruixin Zhou, Shaomin Shuang, Chuan Dong
A novel fluorescent probe based on N,S,P codoped carbon nanodots (N,S,P-CNDSac) is very simple and quickly fabricated by a one-step hydrothermal pyrolysis of Saccharomyces cerevisiae and utilized for label-free and “on–off–on” sequential detection of manganese­(VII) and l-ascorbic acid (l-AA). The fluorescence of N,S,P-CNDSac can be effectively quenched by Mn­(VII) based on an inner filter effect (IFE) and recovered upon the addition of l-AA due to the easy conversion of Mn­(VII) to reduced states (i.e., Mn­(IV), Mn­(II), and Mn(0)) by l-AA. This probe exhibited favorable selectivity and sensitivity toward Mn­(VII) and l-AA with detection limits of 50 nmol/L and 1.2 μmol/L, respectively. Simultaneously, an “AND” logic gate based on the as-fabricated N,S,P-CNDSac has been constructed. Also, the as-proposed fluorescent probe was extended to detect Mn­(VII) and l-AA in biosystems. Furthermore, the as-constructed fluorescent probe system was successfully applied to the analyses of Mn­(VII) in tap water, Fenhe River water, and medicinal herb samples with satisfactory results. The proposed method is simple and easily accessible, demonstrating the great potential of N,S,P-CNDSac in biosensing, disease diagnosis, cellular labeling, and environmental monitoring.

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