Selected Papers : Formation of Nanoporous Anodic Gold Oxide Films in Carboxylic Acids and Spontaneous Reduction to Nanoporous Gold

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<jats:title>Abstract</jats:title> <jats:p>We investigated anodization of gold in aquaous solutions of carboxylic acids as a continuation of anodization of gold in oxalic acid. In contrast to the anodization in aquaous oxalic acid, in which nanoporous gold film is formed, nanoporous gold oxide (Au3+) films are formed in other aquaous carboxylic acids. The orange oxide films were unstable at room temperature: the films blackened within a week and then lightened in color about a month after the anodization. Although the nanoporous framework looked unchanged by SEM observation during the changes in the color, reduction of gold oxide and growth of nanoparticulate gold proceeded in the film. The isothermal adsorption measurement of the nanoporous gold, which was formed in citric acid and kept more than a month at room temperature, revealed that the mean pore size and specific surface area were 13 nm and 60 m2 g−1, respectively. These results demonstrated that bulk gold is easily anodized in aqueous carboxylic acids to form nanoporous gold oxide film. Then, it spontaneously reduces to nanoporous gold at room temperature owing to the noble redox properties of the gold.</jats:p>

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