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. Author manuscript; available in PMC: 2016 Aug 25.
Published in final edited form as: Carbon N Y. 2013 Jul 31;64:341–350. doi: 10.1016/j.carbon.2013.07.084

Fig. 7.

Fig. 7

ATR FT-IR spectrum of GQDs on a silicon substrate. The absorption at 1620 cm −1 is attributed to C=C bonds in aromatic carbon, the one at 1423 cm −1 is assigned to −C−H bending, and the one at 2930 cm 1 is assigned C–H stretching. The spectrum also indicates the presence of C–O and hydroxyl groups on the surface of the GQDs.