A highly selective fluorescent sensor for manganese(II) ion detection based on N, S-doped carbon dots triggered by manganese oxide. (July 2022)

• Record Type: Journal Article
• Authors: Ngeontae, Wittaya; Chaiendoo, Kanokwan; Ngamdee, Kessarin; Ruangchai, Sukhum; Saiyasombat, Chatree; Busayaporn, Wutthikrai; Ittisanronnachai, Somlak; Promarak, Vinich
• Is Part Of: Dyes and pigments. Volume 203(2022)
• Publication Date: 2022-07
• Subjects: Chemical sensors -- Fluorescent sensors -- Optical nanomaterials -- Nanoparticles -- Fluorescence enhancement -- Heavy metal ions; N, S-CDs N, S-doped carbon dots -- ACBF acetic acetate buffer; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2022.110325
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A highly selective, carbon dots (CDs)-based fluorescent sensor for manganese(II) ions (Mn 2+ ) was proposed. The synthesis of N, S-doped CDs (N, S-CDs) involved simple pyrolysis of a mixture of lactose and l -cysteine in a hot NaOH solution. The as-synthesized codoped CDs exhibited a weak fluorescent emission peak at 510 nm when excited at 430 nm. In the presence of Mn 2+, the intensity of the fluorescence signals was effectively increased with a small redshift in the spectrum. Thus, by tracing the degree of fluorescence enhancement, the material could be used as a selective probe for Mn 2+ detection. The possible sensing mechanism was based on the oxidation of the N, S-CDs by MnO2, which was generated from mixing Mn 2+ with NaOH in the N, S-CDs-containing medium. A linear relationship was established between the extent of the increase in fluorescence and the increasing Mn 2+ concentration from 0 to 5.0 μM with a limit of detection (LOD) of 0.12 μM. Remarkably, even in the presence of other cations, the developed sensor remained highly selective toward Mn 2+ . The feasibility of our developed sensor in real applications was confirmed with environmental samples, showing excellent accuracy and precision. Graphical abstract: Image 1 Highlights: A highly selective fluorescent sensor for Mn 2+ by using N, S-CDs. N, S-CDs was prepared by pyrolysis of lactose and l -cysteine in hot NaOH. The fluorescence intensity of the N, S-CDs could be effectively enhanced by Mn 2+ . The N, S-CDs exhibited high selectivity toward the detection of Mn 2+ . Mn 2+ in real water samples can be detected with excellent accuracy and precision.