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. 2021 May 24;10(6):623. doi: 10.3390/antibiotics10060623

Figure 7.

Figure 7

XPS spectra of carbon quantum dots prepared from natural carbon sources: (A) XPS spectra of carbon quantum dots derived from Artemisia argyi leaves. Reproduced with permission from Ref. [78], copyright Royal Society of Chemistry, 2020. (B) XPS spectra of carbon quantum dots derived from flour. Reproduced with permission from Ref. [83], copyright Elsevier. (C) XPS spectra of carbon quantum dots derived from Lactobacillus plantarum bacteria. Ratios presented are between at% of the elements indicated. Reproduced with permission from ref. [23], copyright Frontiers, 2018.