Atomic force microscopy (AFM) was used to study the nanoscopic structure and topography of buck-minsterfullerene (C 60) and a conjugate of C 60 with generation four, amine-terminated, poly(amido amine) dendrimer (PAMAM-G4). The conjugate contains a PAMAM-G4 core and C 60 shell formed by reacting PAMAM-G4 with an excess of C 60. 1 Fractal patterns of C 60 were observed in nanoscopic AFM images when solutions of different concentrations of C 60 in pyridine or toluene were dried at room temperature. In contrast, no fractal patterns were detected in the AFM images of the dendrimer-C 60 nanoconjugate, prepared from pyridine solution in a similar manner. Thus, the C 60-shell alone is not sufficient to impart the same fractal patterns on the conjugate.
- Fractal pattern