Preparation of a Novel Thiol Surface Modifier and Fe₃O₄ Drug Loading Agent as well as Releasing under pH-Sensitivity

Figure 6

XPS spectra of Fe₃O₄-TIPTS-g-(PEI-co-PEG). (a) Full spectrum of Fe₃O₄-TIPTS-g-(PEI-co-PEG). (b) Peak separation of Fe. (c) Peak separation of O. (d) Peak separation of S.

(a)

(b)

(c)

(d)