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Cited by 173

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Multimetallic Aerogels by Template-Free Self-Assembly of Au, Ag, Pt, and Pd Nanoparticles

Herrmann, Anne-Kristin, Formanek, Petr, Borchardt, Lars, Klose, Markus, Giebeler, Lars, Eckert, Jürgen, Kaskel, Stefan, Gaponik, Nikolai, Eychmüller, Alexander·2014·Chemistry of Materials
DOI 10.1021/cm4033258
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Abstract

Nanostructured, porous metals are of great interest for material scientists since they combine high surface area, gas permeability, electrical conductivity, plasmonic behavior, and size-enhanced catalytic reactivity. Here we present the formation of multimetallic porous three-dimensional networks by a template-free self-assembly process. Nanochains are formed by the controlled coalescence of Au, Ag, Pt, and Pd nanoparticles in aqueous media, and their interconnection and interpenetration leads to the formation of a self-supporting network. The resulting noble-metal-gels are transformed into solid aerogels by the supercritical drying technique. Compared to previously reported results, the technique is facilitated by exclusion of additional destabilizers. Moreover, temperature control is demonstrated as a powerful tool, allowing acceleration of the gelation process as well as improvement of its reproducibility and applicability. Electron microscopy shows the nanostructuring of the network and its high porosity. XRD and EDX STEM are used to investigate the alloying behavior of the bimetallic aerogels and prove the control of the alloying state by temperature induced phase modifications. Furthermore, the resulting multimetallic aerogels show an extremely low relative density (<0.2%) and a very high surface area (>50 m 2 /g) compared to porous noble metals obtained by other approaches. Electrically conductive thin films as well as hybrid materials with organic polymers are depicted to underline the processability of the materials, which is a key factor regarding handling of the fragile structures and integration into device architectures. Owing to their exceptional and tunable properties, multimetallic aerogels are very promising materials for applications in heterogeneous catalysis and electrocatalysis, hydrogen storage, and sensor systems but also in surface enhanced Raman spectroscopy (SERS) and the preparation of transparent conductive substrates.

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Metadata

Authors
Herrmann, A.-K., Formanek, P., Borchardt, L., Klose, M., Giebeler, L., Eckert, J., Kaskel, S., Gaponik, N., & Eychmüller, A.
Venue
Chemistry of Materials
Publisher
American Chemical Society (ACS)
Published
2013-12-17
Volume
26
Issue
2
Pages
1074-1083
ISSN
  • 0897-4756 (ISSN-L)
  • 1520-5002
DOI
10.1021/cm4033258
OpenAlex
W2312582886
Cited by
173
References
5
FWCI
6.00
Type
journal article
Language
en
Open access
closed

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