Fig. 2From: Carbon Nanodots as Dual-Mode Nanosensors for Selective Detection of Hydrogen Peroxide a, b Fluorescence decay of CDs before (a) and after (b) adding 0.5 M H2O2. c, d XPS (N1s) of CDs before (c) and after (d) adding 0.5 M H2O2 Back to article page