Supplementary material from "Carbon dots functionalized papers for high-throughput sensing of 4-chloroethcathinone and its analogues in crime sites"

Figure S1. HRTEM image of C-dots; Figure S2. Deconvoluted XPS spectra of C-dots; Figure S3. FTIR spectra of the C-dots and arginine; Figure S4. Structures for some tested abused drugs; Figure S5. Stern-Volmer plot of C-dots for 4-chloroethcathinone; Figure S6. Fluorescence lifetime decay curves of C-dots; Figure S7. Absorption spectra of cocaine, 4-chloroethcathinone, and ephedrine.