Structure and electronic properties of sp 2/sp 3 mixed nano-carbon systems

Structures and electronic properties are presented for three types of sp 2 /sp 3 mixed nano-carbon systems. Nano-diamond/nano-graphite conversion takes place around 1600°C, which changes the magnetism from sp 3 -defect-dominated one to π-edge state originating one. Fluorination in the initial stage, which prefers edge carbon sites of nano-graphites, destroys the π-edge states, and the succeeding fluorination generates sp 3 -defects with surrounding σ-non-bonding state at the interior carbon sites. Diamond-like-carbon has non-equilibrium sp 2 /sp 3 mixed structure with atomic scale disorders, which is easily converted to 3D random network of nano-graphite domains by heat-treatment