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Microwave-assisted synthesis of fluorescent carbon dots from nanocellulose for dual-metal ion-sensor probe: Fe (III) and Mn (II)

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Abstract

A simple one-step microwave-assisted synthesis approach for preparing fluorescent carbon dots (CDs) with an average diameter of 7.86 nm from 2,2,6,6-tetramethylpiperidine-1-oxyl radical-mediated-oxidized cellulose nanofiber (TEMPO-CNF) and 4,7,10-Trioxa-1,13-tridecanediamine is reported in this study. The synthesized TEMPO-CDs exhibited excitation-dependent emission, with optimal excitation and emission wavelengths of 390 nm and 449 nm (bright blue ray), respectively. The fluorescence properties of the synthesized TEMPO-CDs were successfully and selectively quenched by Fe3+ within seconds and by Mn2+ after 10 min. Thus, this phenomenon is further applicable to the development of a fluorescence-sensing system for the quantitative detection of Fe3+ and Mn2+ using the same CD probe; this is the first time such findings have been reported in the CD-related literature.

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Acknowledgments

The authors would like to thank the Open Facility Center for Science and Technology, University of Tsukuba, for allowing us to use their facilities; Nippon Paper Industries Co., Ltd., Japan, for providing TEMPO-CNF; and Chuetsu Pulp & Paper Co., Ltd., Japan, for providing ACC-CNF.

Funding

This work was supported by the Japanese Society of Printing Science and Technology (JSPST) Printing Technology Granted Research Fund (2018), JSPS KAKENHI Grant Number 17KT0069, and the operating budget of the University of Tsukuba (for language editing).

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Conceptualization: DH, TE; Methodology: DH, TE; Formal analysis and investigation: DH, K-HL, YX; Writing—original draft preparation: DH; Writing—review and editing: MK, MAN, KO, T; Funding acquisition: TE; Resources: MK, TE; Supervision: MK, MAN, KO, TE.

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Correspondence to Donghao Hu.

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Hu, D., Lin, KH., Xu, Y. et al. Microwave-assisted synthesis of fluorescent carbon dots from nanocellulose for dual-metal ion-sensor probe: Fe (III) and Mn (II). Cellulose 28, 9705–9724 (2021). https://doi.org/10.1007/s10570-021-04126-9

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  • DOI: https://doi.org/10.1007/s10570-021-04126-9

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