The study of wettability in reduced graphene oxide film on copper substrate using electrostatic spray deposition technique

Abstract

We report the preliminary study of wettability properties of reduced-graphene oxide (rGO) film prepared by electrostatic spray deposition technique. Wettability is an important property in surface material that can drive the direction of development for various applications. The experiments were performed using copper plate as substrate and graphene oxide (GO) solution of 4 mg/ml as coating material. We examined and investigated the effect of various high voltages to surface morphology and wettability of rGO. The voltages are varied at 1.0 and 1.5 kV and substrate temperature was fixed at 150°C. The rGO film was obtained through thermal treatment of GO film at 200°C for 1 hour. The surface morphology of rGO films were examined using optical microscope and scanning electron microscope. The wettability was examined using static contact angle method to determine water contact angle. The results show that the surface roughness and water contact angle of rGO film was affected by deposition voltage. The highest water contact angle of rGO film of 123.98° that indicated good hydrophobic properties was obtained for deposition condition on 1.5 kV.