Abstract
Mesoporous gold (Au) films with tunable pores are expected to provide fascinating optical properties stimulated by the mesospaces, but they have not been realized yet because of the difficulty of controlling the Au crystal growth. Here, we report a reliable soft-templating method to fabricate mesoporous Au films using stable micelles of diblock copolymers, with electrochemical deposition advantageous for precise control of Au crystal growth. Strong field enhancement takes place around the center of the uniform mesopores as well as on the walls between the pores, leading to the enhanced light scattering as well as surface-enhanced Raman scattering (SERS), which is understandable, for example, from Babinet principles applied for the reverse system of nanoparticle ensembles.
Highlights
Mesoporous gold (Au) films with tunable pores are expected to provide fascinating optical properties stimulated by the mesospaces, but they have not been realized yet because of the difficulty of controlling the Au crystal growth
PS-b-PEO diblock copolymer was completely dissolved in tetrahydrofuran (THF), being a good solvent for the PS block, as its unimer
No micelles and/or aggregates were detected in the clear PS-b-PEO/ THF solution by dynamic light scattering
Summary
Mesoporous gold (Au) films with tunable pores are expected to provide fascinating optical properties stimulated by the mesospaces, but they have not been realized yet because of the difficulty of controlling the Au crystal growth. As far as we know, only one pathway to prepare mesoporous/nanoporous Au materials has been reported by dealloying treatment[34,35,36], which is a selective dissolution process of less-noble metals in alloys[37,38] This dealloying approach provides limited control over structural parameters and requires multistep processes under stringent experimental conditions, and the resulting pores are irregular in size and shape. HAuCl4 is dissolved into H3O þ and AuCl4À ions and interacts with the EO shells of the micelles through
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