Effect of initial sp3 content on bonding structure evolution of amorphous carbon upon pulsed laser annealing

► Amorphous carbon films with different sp3 contents are deposited by FCVA technique. ► Pulsed laser annealing is performed on a-C film with different sp3 contents. ► Visible Raman spectroscopy shows that the graphitization is influenced by the initial sp3 content. ► HRTEM shows the texture structure form as a result of graphitization. ► High initial sp3 content film presents a large contrast in electrical conductivity.