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. 2021 Nov 17;9:774486. doi: 10.3389/fchem.2021.774486

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Copyright © 2021 Wan, Zhao, Deng, Chen, Xi and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Absorbance spectra and photographs (inset) obtained from the mixture of NGQDs and TMB in the presence of different concentrations of H₂O₂. (B) Change in absorbance at 652 nm with the increasing H₂O₂ concentration. Inset is the linear calibration plot for colorimetric detection of H₂O₂. (C) The fluorescence spectra of NGQDs in the absence or presence of H₂O₂, TMB, H₂O₂, or their combination. (D) Fluorescence spectrum of NGQDs and absorbance spectra of TMB or oxTMB. (E) Fluorescence spectra of NGQDs in TMB solution containing different concentrations of H₂O₂ (0–210 μM). (F) The linear calibration plot for fluorescent detection of H₂O₂.