Biofouling and corrosion are the two major persistent problems for artificial marine infrastructures.A variety of strategies in particular surface coating techniques have therefore been developed for constructing protection layers for the marine structures.Among the coatings,diamond-like carbon(DLC)films have been extensively explored for specific applications due to their superior anti-corrosion performances and remarkable capability of resisting effectively adsorption of biomolecules on their surfaces.Here we report transparent DLC and DLC-(0.1-39.7at.%)Cu films fabricated by a hybrid linear ion beam deposition technique for antifouling applications.Microstructure,electrochemistry,biological and anti-bacterial performances of the films were examined.Transparent DLC and Cu doped DLC films with transmission efficiency of 50-99%at the wavelength ranging from 400 to 900 nm have been successfully fabricated.Excellent sterilization performances against E.coli and Bacillus sp.bacteria were revealed for the DLC-Cu films.Confocal laser scanning microscopy observation further revealed that the films inhibits markedly adhesion and proliferation of Phaeodactylum tricornutum and Chlorella sp.on their surfaces.Corrosion resistance of the DLC-based films slightly decreases with increase in Cu content.The results shed light on potential antifouling applications of the transparent DLC films in the marine environment.