Fig. 10. (A) The preparation of the multi-functionalized GO-based anticancer drug-carrier with dual-targeting function and pH sensitivity. (B) (i) The release of Dox on GO-Fe₃O₄-FA at different pH values. (ii) Relative cellular viability of HeLa cells after treatment with GO, GOFe₃O₄, Dox, GO–Fe₃O₄–Dox and GO–Fe₃O₄–FA–Dox [this figure has been reproduced from ref. 176 with permission from RSC, Copyright 2011].