Figure 6From: Carboxymethyl chitosan-folic acid-conjugated Fe3O4@SiO2 as a safe and targeting antitumor nanovehicle in vitroHigh-resolution C 1s, O 1s, and N 1s X-ray photoelectron spectra. (a) High-resolution C 1s spectrum of Fe3O4@SiO2-OCMCS-FA, (b) high-resolution O 1s spectrum of Fe3O4@SiO2-OCMCS-FA, (c) high-resolution N 1s spectrum of Fe3O4@SiO2-OCMCS-FA, (d) high-resolution N 1s of OCMCS-FA, and (e) high-resolution N 1s spectrum of FA.Back to article page