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Issue 5, 2019
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Concentration-dependent multicolor fluorescent carbon dots for colorimetric and fluorescent bimodal detections of Fe3+ and L-ascorbic acid

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Abstract

We present a green and facile strategy for fabrication of concentration-dependent multicolor fluorescent carbon dots (CDs) by using coffee, salvia, and urea as the starting material via a one-step hydrothermal method. The obtained CDs emit three different colors of fluorescence (i.e. orange, yellow, and blue) with their concentration reduction. Moreover, yellow fluorescent CDs (Y-CDs) are utilized as a platform for colorimetric and fluorescent dual-mode detections of Fe3+ and L-ascorbic acid (L-AA) with high selectivity and sensitivity. The fluorescence of Y-CDs can be effectively quenched by Fe3+ based on static quenching and subsequently recovered upon the addition of L-AA due to the competitive complexation of L-AA with Fe3+. Therefore, the as-prepared Y-CDs could serve as a highly efficient fluorescent probe for “on–off–on” sequential determination of Fe3+ and L-AA. It is more attractive that Fe3+ and L-AA can also be visualized by this nanosensor via evident color changes under daylight. Furthermore, the designed nanosensor can be extended to detect intracellular Fe3+ and L-AA with outstanding biocompatibility and cellular imaging capability, which holds great promise in biomedical applications.

Graphical abstract: Concentration-dependent multicolor fluorescent carbon dots for colorimetric and fluorescent bimodal detections of Fe3+ and l-ascorbic acid

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Publication details

The article was received on 14 Nov 2018, accepted on 23 Dec 2018 and first published on 27 Dec 2018


Article type: Paper
DOI: 10.1039/C8AY02486C
Citation: Anal. Methods, 2019,11, 669-676

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    Concentration-dependent multicolor fluorescent carbon dots for colorimetric and fluorescent bimodal detections of Fe3+ and L-ascorbic acid

    L. Shi, Z. Hou, C. Zhang, G. Zhang, Y. Zhang, C. Dong and S. Shuang, Anal. Methods, 2019, 11, 669
    DOI: 10.1039/C8AY02486C

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