One-step Synthesis of Sulfur-and Nitrogen-co-doped Carbon Quantum Dots for Fe(Ⅲ) Detection
Not only do the photoluminescence ( PL) properties of carbon quantum dots ( CQDs) de-pend on their sizes, but also rely on their surface states. Accordingly, the PL behaviors of CQDs could be tuned by doping and/or grafting heteroatoms and groups. In this work, sulfur-and nitrogen-co-doped carbon quantum dots ( SN-CQDs) were firstly synthesized by one-step hydrothermal meth-od using p-aminobenzenesulfonicacid as carbon source. Experimental results indicate that the ob-tained SN-CQDs have a uniform size and are modified by amine and sulphonic acid groups at their surface. Unlike previous reports, the SN-CQDs show the excitation-wavelength-independent photolu-minescence behavior and their fluorescence can be quenched by Fe3+ ions. There is a good linear relationship between the Fe3+ concentrations within 0-10 -3 mol·L-1 and the fluorescence quench-ing rates of SN-CQDs. The detecting limit for Fe3+ ions is about 10 -7 mol·L-1 . The obtained SN-CQDs have the ability of high selectivity, high sensitivity and good anti-jamming capability to ferric iron ions. Accordingly, SN-CQDs can be used for the detection of Fe3+ ions in the environment and organism.
carbon quantum dotsferric iron ionfluorescence quenching
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