Figure 1.

Synthesis and characterization of GO and UA-rGO by ultraviolet-visible spectroscopy. Spectra of GO exhibited a maximum absorption peak at approximately 230 nm, which corresponds to a π–π transition of aromatic C–C bonds. The absorption peak for reduced GO was red-shifted to 260 nm. At least three independent experiments were performed for each sample, and the results were reproducible. This figure shows the results of a representative experiment.