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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,B) Photographs of internal Teflon reactor (A) and stainless steel housing (B) of an autoclave for the preparation of NGQDs. (C) Powder of NGQDs obtained by one-pot synthesis. (D,E) Photographs of NGQD solution (2 mg/ml) under visible (D) or 365 nm UV lights (E). (F) TEM image. Insets are HRTEM image (top) and size distribution of NGQDs. (G) AFM image. Inset shows the height profile along the red line. (H) Fluorescence emission spectra obtained at different excitation wavelengths. (I) Fluorescence lifetime spectrum.