Single-step electrodeposition of superhydrophobic black NiO thin films

Ahmad Bahramian (1) , Marielle Eyraud (1) , F. Vacandio (1) , V. Hornebecq (1) , T. Djenizian (2) , P. Knauth (1)

1 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie
2 Mines Saint-Etienne, Center of Microelectronics in Provence, Department of Flexible Electronics, 13541 Gardanne

Black finished surfaces have extensive applications in many domains, such as optics, solar cells, and aerospace. The single step electrodeposition of superhydrophobic black NiO films from a dimethyl sulfoxide based electrolyte is described in this paper. The physicochemical properties of the obtained film were characterized using Scanning Electron Microscopy, X-ray Diffraction, and electrochemical tests (Electrochemical Impedance Spectroscopy and potentiodynamic polarization). A rough surface with a low reflection of light was formed after the deposition process that increased the contact angle of water from about 87º (for bare Cu) to 163º (in presence of the black coating), which improved the corrosion resistance of the Cu substrate by about 30%. The formed black NiO film revealed a notably high stability and kept its appearance even after corrosion tests.

Keywords: Black NiO; Superhydrophobic; Corrosion; Electrodeposition; thin films

Domains: Chemical Sciences; Material chemistry

Ahmad Bahramian, Marielle Eyraud, F. Vacandio, V. Hornebecq, T. Djenizian, et al.. Single-step electrodeposition of superhydrophobic black NiO thin films. Journal of Applied Electrochemistry, 2019, 49 (6), pp.621-629. ⟨10.1007/s10800-019-01305-2⟩. ⟨hal-02470700⟩