Fig. 1From: Effect of graphene oxide/ poly-L-lactic acid composite scaffold on the biological properties of human dental pulp stem cellsCharacterization of composite scaffolds. (A) The general appearance of GO/PLLA scaffolds. (B, C, D) The surface structure of GO, PLLA, and GO/PLLA scaffold was observed under scanning electron microscopy (SEM). Scale bar: 2 μm. (E) Fourier transform infrared (FTIR) spectroscopy analysis of GO, PLLA, and GO/PLLA scaffoldBack to article page