Green preparation of carbon quantum dots with wolfberry as on-off-on nanosensors for the detection of Fe3+ and l-ascorbic acid. (15th May 2022)

• Record Type: Journal Article
• Authors: Gu, Lin; Zhang, Jingru; Yang, Guangxin; Tang, Yunyu; Zhang, Xuan; Huang, Xuanyun; Zhai, Wenlei; Fodjo, Essy Kouadio; Kong, Cong
• Is Part Of: Food chemistry. Volume 376(2022)
• Publication Date: 2022-05-15
• Subjects: Carbon quantum dots -- Fluorescence -- Ferrite -- l-Ascorbic acid -- Nanosensor; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2021.131898
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: A facile and green hydrothermal approach for the preparation of nitrogen-doped carbon quantum dots ( N -CQDs) with wolfberry is proposed. The N -CQDs displayed superior fluorescence characteristics of CQDs with a quantum yield up to 22%. This N -CQDs is successfully developed for 'on-off' detection of Fe 3+ and 'on-off-on' detection of l -ascorbic acid. Abstract: A green and facile hydrothermal synthesis approach is proposed for the preparation of nitrogen-doped carbon quantum dots ( N -CQDs) with wolfberry. These N -CQDs were developed as a highly sensitive fluorescent 'on-off-on' switch sensor for the sensing of Fe 3+ and l -ascorbic acid (AA). The N -CQDs displayed superior fluorescence characteristics of CQDs with a quantum yield up to 22%. The N -CQDs were demonstrated to selectively react with Fe 3+, leading to fluorescence quenching effect, which was successfully used for the detection of Fe 3+ with a limit of detection at 3 μmoLL −1 . The addition of AA is supposed to repair the surface defects, and result in the fluorescence recovery. Based on this effect, the strategy of 'on-off-on' detection of AA was established with a limit of detection at 1.8 μmoLL −1 . Furthermore, the practical application of the detection of Fe 3+ lake water and AA in medical tablet was demonstrated, promising an effective and efficient 'on-off-on' nanosensor with low-cost, green synthesis for Fe 3+ and AA detection.