A new carbon solid made of the world's smallest caged fullerene C20

Caged fullerene C20 solids were successfully synthesized by means of ion beam irradiation method. The characterization of structures and features of C20 crystal have been performed using various complementary analysis techniques, such as high-resolution transmission electron microscope, electron diffraction, laser desorption post-ionization, and Raman spectroscopy. These results indicate that in condensed phases C20 molecules can act as dodecahedron carbon cages; in particular the capability of acting as a building blocks of hexagonal crystal.