Fig. 2. Characteristics of RGO-CPCs (A) morphological analysis. RGO-CPCs became darker as the RGO concentration increased (inset). According to the FESEM results, the surface of RGO-CPCs aggregated more with the increased RGO concentration. Scale bars = 3 μm. (B) XRD results. HA specific peaks were present in all samples. In 0.1 and 1% RGO, new peak representing RGO was present at approximately 25°. (C) Raman spectroscopy results. Hydroxyapatite specific peaks were shown in all samples. The peaks representing RGO were clearly shown in 1% RGO. FESEM: field emission scanning electron microscopy, XRD: X-ray diffraction.