Nickel concentration dependent structural and optical properties of electrodeposited diamond like carbon thin filmsBeauty Pandey, Jonaki Mukherjee, Bidyut Das and Asit K. KarEur. Phys. J. Appl. Phys., 66 1 (2014) 10302DOI: https://doi.org/10.1051/epjap/2014130435