Aluminium (Al) films roughened by hot water treatment were used to investigate the impact of their roughness on hydrophobicity upon their derivatization via self-assembled monolayers (SAMs) of a fluoroalkyl phosphonic acid (FPA). Superhydrophobicity was achieved for FPA-derivatized Al films that had been treated in hot water briefly (e.g. 60–180 s), while for prolonged treatment times (e.g. beyond 240 s) degraded hydrophobicity was observed. The observed degradation of hydrophobicity is attributed to surface morphology changes causing water to enter the pores of the roughened Al films. Also studied is the surface chemistry of the FPA SAMs derivatized on Al films, including their thermal stability and a possible mechanism that improves the hydrophobicity. Our results demonstrate that an Al surface immersed in hot water for a couple of minutes generates a porous morphology suitable for rendering superhydrophobicity upon derivatization of the robust FPA SAMs.
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