Figure 1.

Examples of gadolinium‐containing carbon nanomaterials. (A) Scheme of the synthesis of water‐soluble polyhydroxylated gadofullerenes (Gd@C₈₂(OH)_n). Reprinted with permission from,12 copyright 2001 American Chemical Society. (B) Images of gadonanotubes. (a) Depiction of a single US‐tube loaded with hydrated Gd³⁺ ions and its (b) HRTEM and (c) Cryo‐TEM images. Reprinted with permission from,13 copyright 2005 Royal Society of Chemistry. (C) Structural drawing of a gadonanodiamond. Gd(III) complexes are employed for nanodiamond functionalization. Reprinted with permission from,37 copyright 2010 American Chemical Society. (D) Scheme of the structure of a gadographene: GO‐PEG‐FA/Gd/DOX. DOX, doxorubicin; DTPA, diethylenetriamine‐pentaacetic acid; FA, folic acid; GO, graphene oxide; PEG, polyethylene glicol. Reprinted with permission from,38 copyright 2012 Wiley & Sons