Figure 1.

Synthesis and characterization of core/shell-structured CTAC@Nb₂C-MSN. (A) The scheme of the synthetic procedure and stepwise surface PEGylation/targeting modification of CTAC@Nb₂C-MSN. (B) SEM image of Nb₂C MXene as-synthesized by the first-step HF etching. (C) Low- and (D) high-magnification TEM images of as-synthesized Nb₂C MXene nanosheets. (E) Low- and (F) high-magnification TEM images of CTAC@Nb₂C-MSN composite nanosheets. Inset of (E): scheme of the microstructure of CTAC@Nb₂C-MSN.