Pore-size control dynamics of nanoporous metals based on in-situ observations and atomic simulation

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In-situ transmission electron microscopic observations of nanoporous Au at high temperatures were conducted. Nonuniform coarsening occured even in an identical sample which had been fabricated by sputtering of Au-Ag and subsequent dealloying. Therefore it is suggested that the estimation of coarsening behavior is difficult because of this nonuniformness.As a probe for surface area of nanoporous metals, catalytic properties of nanoporous Au for decoloration of organic dyes were examined. The reaction kinetic constant for decomposition of methyl orange was not proportional to the surface area estimated by cyclic voltammetry. Therefore the atomic defects on ligament surface of nanoporous Au serve as specific points for the catalytic reaction. The role of surface atomic defects is also supported by the electronic structure by atomic defects on the Au (111) surface simulated by first-principles calculations.