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Research Article

Ultrastable and ultrasensitive pH-switchable carbon dots with high quantum yield for water quality identification, glucose detection, and two starch-based solid-state fluorescence materials

Daiyong Chao1,2, Jinxing Chen2, Qing Dong1,2, Weiwei Wu2, Desheng Qi1, Shaojun Dong1,2( )
College of Chemistry, Jilin University, Changchun 130012, China
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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Abstract

It is attractive and encouraging to develop new fluorescent carbon dots (CDs) with excellent optical properties and promising applications prospects. Herein, highly-efficient green emissive CDs (m-CDs) with a high quantum yield (QY) of 71.7% in water are prepared through a facile solvothermal method. Interestingly, the m-CDs exhibit excellent fluorescence stability in the pH range of 1-9. However, the fluorescence intensity of the m-CDs is almost completely quenched as the pH is increased from 9 to 10. The mechanism of the unique pH-responsive behavior is discussed in detail and a plausible mechanism is proposed. Owing to the unique pH-responsive behavior, the m-CDs are used as a on-off fluorescent probe for water quality identification. By combining the reversible pH-ultrasensitive optical properties of the m-CDs in the pH range of 9-10 with the glucose oxidase-mimicking (GOx-mimicking) ability of Au nanoparticles (AuNPs), glucose can be quantitatively detected. Finally, two environment-friendly starch-based solid-state fluorescence materials (powder and film) are developed through green preparation routes.

Keywords

carbon dothigh quantum yieldpH-ultrasensitive optical propertieswater quality identificationglucose detectionsolid-state fluorescence materials

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Nano Research
Volume 13 Issue 11,
November 2020
Pages 3012-3018
DOI: 10.1007/s12274-020-2965-8
Cite this article:
Chao D, Chen J, Dong Q, et al. Ultrastable and ultrasensitive pH-switchable carbon dots with high quantum yield for water quality identification, glucose detection, and two starch-based solid-state fluorescence materials. Nano Research, 2020, 13(11): 3012-3018. https://doi.org/10.1007/s12274-020-2965-8
Topics:
CarbonFluorescenceGlucoseGlucose oxidaseGlucose sensors Gold nanoparticlesOptical propertiesQuantum theory Quantum yield

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Received: 03 May 2020
Revised: 29 June 2020
Accepted: 30 June 2020
Published: 07 August 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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