Fig. 1.

Characterization of GCE/siRNA. (A) The chemical structure of GO, CS, GO-COOH, GO-CS and GCE were determined by FTIR spectra. (B) AFM images of GO (a) and GCE (b). (C) The zeta potential value of GO (a), GO-CS (b), GCE (c) and GCE/siRNA (30:1, w/w) (d), the particle size of GO (e), GO-CS (f), GCE(g) and GCE/siRNA (30:1, w/w) (h). (D) TEM of GO (a) and GCE (b). The data were presented as the mean ± SD, n = 3 (For interpretation of the references to color in this figure, the reader is referred to the web version of this article.).