Issue 12, 2024

“On–off–on” fluorescent sensor based on Ti3C2 quantum dots and CoOOH nanosheets for the detection of ascorbic acid

Abstract

Titanium carbide quantum dots (Ti3C2 QDs) are derived from MXenes, an emerging layered two-dimensional material. Ti3C2 QDs exhibit better chemical stability, dispersibility, and photoluminescence than MXenes and have great application potential in biological imaging, environmental pollution, and food safety. Ascorbic acid (AA), a key coenzyme in human metabolic pathways, plays an important role in various physiological reactions. Herein, a fluorescent sensor to detect AA is designed by combining Ti3C2 QDs with cobalt oxy-hydroxide (CoOOH) nanosheets. CoOOH nanosheets, as effective fluorescence quenching agents, can considerably quench the fluorescence of Ti3C2 QDs. During the detection process, AA is oxidized to dehydroascorbic acid and CoOOH nanosheets are reduced to Co2+ and disintegrated, resulting in the recovery of the fluorescence intensity of Ti3C2 QDs. Therefore, AA is detected by monitoring the degree of recovery of the fluorescence intensity of Ti3C2 QDs. The fluorescent sensor exhibits a linear range of 0–100 μM and a detection limit of 0.19 μM for AA. Its recovery rates in commercial orange juice and watermelon juice are 97.12–103.95% and 94.46–107.32%, respectively, and it exhibits good detection reproducibility. This fluorescent sensor can be used to measure the AA concentration in fruits and beverages.

Graphical abstract: “On–off–on” fluorescent sensor based on Ti3C2 quantum dots and CoOOH nanosheets for the detection of ascorbic acid

Supplementary files

Article information

Article type
Paper
Submitted
11 Oct 2023
Accepted
26 Feb 2024
First published
28 Feb 2024

New J. Chem., 2024,48, 5258-5266

“On–off–on” fluorescent sensor based on Ti3C2 quantum dots and CoOOH nanosheets for the detection of ascorbic acid

F. Hu, Y. Mao, J. Huang, L. Wan, S. Liu, Z. Wen and F. Ai, New J. Chem., 2024, 48, 5258 DOI: 10.1039/D3NJ04736A

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