Abstract
S, N-co-doped carbon quantum dots (S, N-CQDs) as the fluorescent source and β piezoelectric phase inducer were implanted into a poly (vinylidene) fluoride-hexafluoropropylene (PVDF-HFP) microporous film to prepare the fluorescent and piezoelectric S,N-CQDs/PVDF-HFP composite film based on sensitization technology. The results showed that S, N-CQDs were uniformly anchored into the PVDF-HFP skeletons. This promoted the polarization effect and prevented solid-state luminescence quenching, further ensuring the coupling of fluorescent and piezoelectric bifunctions in the composite film. Since the induced polarization effect, the β piezoelectric phase in the composite film climbed from 65.8% to 86.6% with an amplitude of 31.6%, which caused the increase in piezoelectric constant (d33) from 15.4 to 21.6 pC N−1 with an amplitude of 40.26%. Because of the absence of solid-state luminescence quenching, the light cyan fluorescence from S, N-CQDs was successfully realized in the composite film. The application of the composite film in the flexible pressure sensor (FPS) enabled to achieve an outstanding sensitivity of 267.75 mV N−1, exceeding that (191.73 mV N−1) when using the pure PVDF-HFP film. Moreover, the embedding of S, N-CQDs endowed the FPS with several new functions mainly owning to the ultraviolet excited fluorescence of the composite film.
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Funding
This research was supported by the National Natural Science Foundation of China (Grant No. 52264035), Zhejiang Provincial Natural Science Foundation of China (grant no. LY24E020007), Natural Science Foundation of Jiangxi (Grants Nos. 20224BAB214023 and 20232BAB204010) and Science and Technology Project of Huzhou (Grant No. 2023GZ59).
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SX contributed toward conceptualization; YL and YL contributed toward supervision; YW, PH, and SX contributed toward methodology; YW, and PH contributed toward formal analysis; YW, PH, and SX contributed toward investigation; YW, PH, and SX contributed toward data curation; YW and SX contributed toward writing-original draft; YL and YL contributed toward Writing-review and editing of the draft. All authors have read and agreed to the published version of the manuscript.
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Wang, Y., Huang, P., Xu, S. et al. Coupling of fluorescent and piezoelectric bifunctions in PVDF-HFP microporous film with highly dispersed carbon dots. J Mater Sci: Mater Electron 35, 1119 (2024). https://doi.org/10.1007/s10854-024-12829-5
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DOI: https://doi.org/10.1007/s10854-024-12829-5