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The polymerization of fullerenes has been an interesting topic for almost three decades. A rich polymeric phase diagram of C60 has been drawn under a variety of pressure-temperature conditions. However, only linear or perpendicular linkages of C60 are found in the ordered phases. Here we used a unique bilayer structural solvate, C60·1,1,2-trichloroethane (C60·1TCAN), to generate a novel quasi-3D C...
There has been a long-standing search for 3D metallic, superhard carbon, stable under ambient conditions. Here, we report the discovery of a new 3D orthorhombic phase (denoted C14-diamond below) from first-principles calculations. This allotrope is metallic and superhard and is built from nano-layered sp3 carbon with the cubic diamond structure, connected by proper sp2-bonded ethene-type CC links...
Several metastable doped C60 polymers are synthesized under high pressure and high temperature (1.5 GPa, 573 K and 2 GPa, 700 K, respectively), using C60/ferrocene(Fc, Fe(C5H5)2), C60/Ni(OEP) and C60/AgNO3 as starting materials. Raman and IR spectroscopy are used to study the polymerization of these samples after HPHT treatment. It is found that the polymerization degree is always lower than that...
High pressure Raman, IR and X-ray diffraction (XRD) studies have been carried out on C 70 (Fe(C 5 H 5 ) 2 ) 2 (hereafter, “C 70 (Fc) 2 ”) sheets. Theoretical calculation is further used to analyze the Electron Localization Function (ELF) and charge transfer in the crystal and thus to understand the transformation of C 70 (Fc) 2 ...
We report a simple synthesis of C 70 microcrystals by a fast solvent-assisted evaporation method by selectively using aromatic solvents with halogen radicals as a controller. In a detailed analysis we show that depending on solvent, C 70 concentration in the solution, and synthesis temperature both C 70 microrods and microcubes can be produced. The samples were characterized...
We have encapsulated adamantane (C 10 H 16 ) in single- and multi-walled carbon nanotubes. Adamantane is a high symmetry cage like molecule with point group symmetry T d and can be considered as a hydrogen-terminated diamond fragment. We confirmed and identified the successful filling by high resolution transmission electron microscopy, 13 C nuclear magnetic resonance,...
We present a detailed study of the synthesis of C 60 nano- and microrods as well as crystals with normal shapes by the evaporation of C 60 solutions based on different aromatic solvents. C 60 nano- and microrods are grown with high yield by vaporizing C 60 solutions in meta-isomers of aromatic solvents on different substrates while para-isomers give a different type...
The effect of a new bimetallic catalyst Ho/Ni for synthesis of single-walled carbon nanotubes (SWNTs) by arc discharge has been studied. Long ribbons consisting of roughly-aligned SWNT bundles were obtained by a modified arc discharge apparatus. Ribbon lengths can reach as much as 20cm. Both elements Ho and Ni play important roles in the synthesis of SWNTs with high yield and purity. Changes in the...
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