Microstructure-dependent oxidation-assisted dealloying of Cu0.7Al0.3 thin films

TL;DR

This study investigates how microstructure influences oxidation-assisted dealloying of Cu0.7Al0.3 films, enabling controlled fabrication of CuO porous nanostructures with tailored properties.

Contribution

It reveals the impact of microstructure on corrosion morphology and provides a method to control pore features in CuO nanostructures through OAD.

Findings

Microstructure affects corrosion morphology significantly.

Controlled fabrication of CuO porous nanostructures is possible.

Different microstructures lead to distinct corrosion mechanisms.

Abstract

In this paper, the oxidation-assisted dealloying (OAD) of Cu0.7Al0.3 films with different microstructures which were obtained by high vacuum annealing at different temperatures were studied using powder X-ray diffraction, field-emission scanning electron microscopy and energy dispersive X-ray analysis. It was observed that different microstructures such as eutectic mixture or solid solution, the grain size of Cu or Al component in eutectic-mixture Cu0.7Al0.3 films affected the corrosion morphology greatly. It thus provided a practical route to fabricate flexible CuO porous nanostructure-films (PNFs) with controllable pore size, porosity, block size and shape. Further, the underlying OAD mechanisms for the structure-resultant different corrosion morphologies of Cu0.7Al0.3 films were also explored. In these senses, the study is suggestive and crucial to both the mechanism understanding of OAD process and the technical controlling of PNF fabrication.