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We synthesized dodecyloxymethyl functionalized EDOT monomers and fabricated homogeneous thin films via cycle voltammetry electrochemical deposition method on platinum and ITO substrates. The PEDOT-C12 thin films showed good electrochemical activity. Meanwhile, by increasing the cyclic voltage-scan number during electrochemical deposition process, the surface roughness was also enhanced. The large surface roughness and occurrence of micro-nano surface morphologies would lead to higher water contact angles for the PEDOT-C12 thin films. The water contact angle for the PEDOT-C12 thin films with 10 deposition cyclic voltage-scans was 160° and showed superhydrophobicity. The achieved superhydrophobic PEDOT-C12 thin films would have potential applications in corrosion protecting for metal electrodes in aqueous environment.

A gradient nano-grained (GNG) surface layer is produced on a bulk coarse-grained Cu by means of a surface mechanical grinding treatment. Homogeneous grain coarsening induced by mechanical deformation is observed in the GNG Cu layer under tensile tests at both 300 K and 123 K. The concurrent grain coarsening during tensile deformation is proven to be also thermally activated, because the extent of grain coarsening of the GNG Cu layer is less significant at 123 K than at 300 K, although a higher flow stress is achieved at 123 K. During the subsequent storage at 258 K after tensile tests, no obvious change can be found for the grain size in the GNG Cu layer deformed at 300 K. In contrast, widespread abnormal grain coarsening is frequently observed in the GNG Cu layer deformed at 123 K and stored for 100 days, which may be caused by the higher stored energy in the non-equilibrium grain boundary structures.