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Flexible all-biomass gas sensor based on doped carbon quantum dots/nonwoven cotton with discriminative function

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Abstract

Carbon quantum dots (CQDs) co-doped with N, P and S derived from expired milk was prepared by a simple hydrothermal method. By dipping pure cotton face towel (PCFT) into CQDs ink, a flexible all-biomass CQDs/PCFT sensor was prepared for the first time. Due to the heteroatom doping, extremely small particle size of CQDs and excellent permeability of CQDs/PCFT film, the flexible CQDs/PCFT sensor showed the high sensitivity and bending stability. In the range of 0–60° bending states, the responses of CQDs/PCFT sensor to four target analytes changed by less 5.0%. After 3000 bending of 60°, the maximum change of the response to the target analytes was only 6.4%. Interestingly, due to the abundant functional groups and defects of CQDs, the flexible CQDs/PCFT sensor displayed sensing curves of different shapes for different target analytes. In this way, by establishing a database of sensing curves of target analytes, multiple analytes can be detected discriminatively by relying only on single sensor with the help of image recognition. This work provided a reference for the development of cotton fiber based all biomass flexible gas sensor.

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Acknowledgments

This research was funded by National Natural Science Foundation of China (21964016, 11664038, 61864011), Natural Science Foundation of Xinjiang Uygur Autonomous Region (2019D01C019, XJEDU2020Y004) and Tianshan Innovation Team Program of Xinjiang Uygur Autonomous Region (2020D14038).

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ZW and MZ conceived and designed the experiment; SC, LW and ZQ carried out the experiment, processed the data and wrote the first draft; ZW, MZ, FZ and HD contributed to scientific discussion and modification of the manuscript.

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Correspondence to Min Zhang or Haiming Duan.

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This study following Compliance with Ethical Standards; this study does not involve human participants, animals, and potential conflicts of interest.

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Wu, Z., Zhang, M., Cao, S. et al. Flexible all-biomass gas sensor based on doped carbon quantum dots/nonwoven cotton with discriminative function. Cellulose 29, 5817–5832 (2022). https://doi.org/10.1007/s10570-022-04633-3

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  • DOI: https://doi.org/10.1007/s10570-022-04633-3

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