首页|Preparation of nanoporous gold particles on diamond facets via galvanic replacement and dealloying
Preparation of nanoporous gold particles on diamond facets via galvanic replacement and dealloying
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NSTL
Elsevier
? 2022 Elsevier B.V.In the present work, methods of depositing gold particles of different morphologies on the facets of synthetic diamond microcrystals have been proposed. When diamond crystals with silver particles selectively deposited on the {100} facets are treated by chloroauric acid HAuCl4 solution, partial galvanic replacement of silver by gold leads to the formation of hollow porous hemispheres of an Ag–Au alloy. Upon annealing of the diamond crystals with particles, in which silver was partially replaced by gold, an Ag–Au solid solution forms on the {100} facets. Selective dissolution of silver from the Ag–Au solid solution results in the formation of nanoporous gold via a dealloying process. Gold particles can also be formed by sputtering gold on the surface of the diamond crystals with silver particles adhered to the {100} facets, annealing the modified crystals and dealloying. In that case, gold particles are found on all facets of diamond. However, the morphological features of the particles depend on the crystallographic orientation of the facet. Nanoporous gold particles are found only on the {100} facets of diamond.
NSTL
Elsevier
