Figure 4: Scientific Reports

Figure 4

From: Design of Carbon Dots Photoluminescence through Organo-Functional Silane Grafting for Solid-State Emitting Devices

Figure 4

(a) FTIR absorption spectra in the range 1660–1580 cm−1 of the GPTMS – C-dots grafting sol at different reaction times: 1 hour (black line), 2 days (blue line), 5 days (green line) and 2 weeks (red line). The arrow is a guide for eyes to indicate the increase of the vinyl bands with the reaction time. (b) 1H-NMR spectra of GPTMS – C-dots grafting sol with reaction times up to 3 weeks. (c) Formation of ethylene oxide chains with grafting through epoxy-ring opening and the polymerization between GPTMS molecules at the C-dots surface.