Abstract
Nanoporous gold sponges are useful for a variety of applications but the kinetics of the dissolution process used to make them is not well understood.
Highlights
Nanoporous gold sponges can be produced by de-alloying AuxAl precursors by selective corrosion of the Al.[1,2,3] Sponges produced this way are o en called “Raney” sponges by analogy with the widely used catalytic RANEY® nickel sponge produced by dealloying NixAl alloys in NaOH solution
Gold sponges produced from Au–Al alloys are a sub-set of the broader class of nanoporous gold sponges that can be produced by de-alloying precursors like Au–Ag, Au–Cu–Si or Au– Sn4–7 and, catalytic efficacy has been reported[8,9] for these types of gold sponge too
We show how equivalent kinetic data for the rate of de-alloying may be more obtained by making in situ optical transmittance measurements of thin lms undergoing de-alloying
Summary
Nanoporous gold sponges can be produced by de-alloying AuxAl precursors by selective corrosion of the Al.[1,2,3] Sponges produced this way are o en called “Raney” sponges by analogy with the widely used catalytic RANEY® nickel sponge produced by dealloying NixAl alloys in NaOH solution. Gold sponges produced from Au–Al alloys are a sub-set of the broader class of nanoporous gold sponges that can be produced by de-alloying precursors like Au–Ag, Au–Cu–Si or Au– Sn4–7 and, catalytic efficacy has been reported[8,9] for these types of gold sponge too Due to their good electrical conductivity,[10] gold sponges may nd application in electrochemical capacitors,[11,12] substrates for surface enhanced Raman scattering (SERS),[13,14,15] plasmonic applications,[16,17] electrodes for solar cells, and applications as sensors.[18,19]
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