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Gold aerogels: Three-dimensional assembly of nanoparticles and their use as electrocatalytic interfaces

: Wen, Dan; Liu, Wei; Haubold, Danny; Zhu, Chengzhou; Oschatz, Martin; Holzschuh, Matthias; Wolf, André; Simon, Frank; Kaskel, Stefan; Eychmüller, Alexander


ACS nano 10 (2016), No.2, pp.2559-2567
ISSN: 1936-0851
ISSN: 1936-086X
Deutsche Forschungsgemeinschaft DFG
ERC-2013- ADG 340419; AEROCAT
Journal Article
Fraunhofer IWS ()
Au aerogels; dopamine receptors; electrocatalysis; host-guest interaction; nanoparticle assembly; porous metal

Three-dimensional (3D) porous metal nanostructures have been a long sought-after class of materials due to their collective properties and widespread applications. In this study, we report on a facile and versatile strategy for the formation of Au hydrogel networks involving the dopamine-induced 3D assembly of Au nanoparticles. Following supercritical drying, the resulting Au aerogels exhibit high surface areas and porosity. They are all composed of porous nanowire networks reflecting in their diameters those of the original particles (5–6 nm) via electron microscopy. Furthermore, electrocatalytic tests were carried out in the oxidation of some small molecules with Au aerogels tailored by different functional groups. The beta-cyclodextrin-modified Au aerogel, with a host–guest effect, represents a unique class of porous metal materials of considerable interest and promising applications for electrocatalysis.