Fig. 17From: Herbal medicine derived carbon dots: synthesis and applications in therapeutics, bioimaging and sensingpH sensing of HM-CDs. a The response mechanism of pH-sensitive HM-CDs, b pH dependence for Hg2+ detection using photoluminescent CDs derived from giant knotweed rhizome. c(Hg2+): 100.0Â mM; pH: 5.8, 6.2, 6.6, 7.0, 7.4, 8.0, 9.3; ex: 320Â nm; em: 400Â nm. Each point is an average of three successive measurements. Reprinted with permission from ref. [87]. Copyright (2013) Royal Society of ChemistryBack to article page