Figure 3. Raman measurements of (A) GO and (B) GO-CuO

From

Graphene-CuO nanocomposite for Efficient Photocatalytic Reduction of Pb (II) under Solar Light Irradiation

B. Prashanti, I. Sreevani, B. Suresh, T. Damodharam

Applied Ecology and Environmental Sciences. 2019, 7(5), 176-181 doi:10.12691/aees-7-5-3