A lustrous golden thin film has been fabricated on electrode surfaces by electrophoretic deposition (EPD) of azobenzene-based organic molecular crystals (DC-azo). The molecular crystals were deposited on the anodic substrate by applying a DC voltage of 30 − 200 V in a hexane suspension. The crystal structure, electronic, and optical features of the EPD film were determined using single-crystal and powder X-ray diffraction, scanning electron microscopy, UV-vis spectroscopy, and density functional theory calculations. Cross-sectional microscopic observation indicates that plate-like DC-azo crystals are parallelly aligned to the electrode surfaces, resulting in preferential orientation along the (001) plane. Stacking of the planar faces produces the metallic luster and a relatively high specular reflectance in the range of 540 − 780 nm owing to the absorption of incident light and its multiple reflection at the surface of each plane. The lightweight and insulating DC-azo crystals demonstrate that EPD could provide a promising route to decorate a wide variety of material surfaces with metal-free, non-electroconductive textures.
|Journal||Colloids and Surfaces A: Physicochemical and Engineering Aspects|
|Publication status||Published - 20 Oct 2019|
- Density functional theory (DFT)
- Electrophoretic deposition (EPD)
- Gold luster