Nano-Structural Studies on C60/PMMA Composite Films
C60-PMMA复合膜的纳米结构研究

C60-polymethyl methacylate (PMMA) composite films were prepared by the chemical organic deposition method with the different weight ratios C60 to PMMA. The measurements of Fourier transform infrared (FTIR) spectra for the as-prepared films show that C60 molecules are embedded into PMMA. X-ray diffraction (XRD) and transmission electron microscope (TEM) were employed to study the structures of the films. The measurement results suggest that C60 molecules in the films tend to aggregate each other and to form some tiny C60 crystallites due to the increase in the C60 content. TEM observition shows that regular C60 crystallites of about 30~100nm are distributed homogeneously in the PMMA film. The selective area diffraction indicates that the crystallized particles in the films are single crystal ones with fcc structure. The theory of Boltzmann distribution well explains the phenomenon that C60 crystallite size increases with increasing C60 content or annealed at enhanced temperature.