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Shape-selective synthesis of palladium nanoparticles stabilized by highly branched amphiphilic polymers

Shape-selective synthesis of palladium nanoparticles stabilized by highly branched amphiphilic polymers
Shape-selective synthesis of palladium nanoparticles stabilized by highly branched amphiphilic polymers
Despite the broad interest in such materials, the synthesis of defined structures in the size range of 10 nm to ca. 1 micrometer ("mesoscopic") is challenging. Few routes shape-selectively afford geometrically regular structures other that the typical spherical metal particles of 1 to 10 nm. Moreover, these few routes are largely restricted to aqueous systems, however, for catalysis and other applications dispersions in organic solvents are desirable. Carbon monoxide reduction of a palladium(II) compound in combination with stabilization by (readily available) amphiphilic hyperbranched ploymers surprisingly affords dispersions of hexagonal platelets selectively with average sizes of thirty to several hundred nanometers in toluene. The size can be controlled by the polymer compositions. Transmission electron microscopy (TEM), electron diffraction, and extended x-ray absorption fine structure (EXAFS) spectroscopy demonstrate these palladium(0) platelets to be extremely thin (1 - 2 nm). Despite this high aspect ratio, the platelets prove quite shear resistant.
hyperbranched polymers, nanoparticles, palladium, synthesis, shape controlled
1616-301X
999-1004
Schlotterbeck, U.
250d8616-449a-47b3-b342-1c1a8f7bfd4a
Aymonier, C.
d5a1e4f6-6f4e-41f2-96aa-43e53f98368e
Thomann, R.
f43bb7ac-a00c-4ebc-8ec5-26e3a2669f2e
Hofmeister, H.
68f8e135-944d-4433-94e7-af3677f3f423
Tromp, M.
48c1ebbb-579c-42b6-83bb-7188c668b322
Richtering, W.
ea309736-e70d-4e23-aba9-a20d467c3e29
Mecking, S.
ef91b0d1-a872-466c-9989-bef100d3623c
Schlotterbeck, U.
250d8616-449a-47b3-b342-1c1a8f7bfd4a
Aymonier, C.
d5a1e4f6-6f4e-41f2-96aa-43e53f98368e
Thomann, R.
f43bb7ac-a00c-4ebc-8ec5-26e3a2669f2e
Hofmeister, H.
68f8e135-944d-4433-94e7-af3677f3f423
Tromp, M.
48c1ebbb-579c-42b6-83bb-7188c668b322
Richtering, W.
ea309736-e70d-4e23-aba9-a20d467c3e29
Mecking, S.
ef91b0d1-a872-466c-9989-bef100d3623c

Schlotterbeck, U., Aymonier, C., Thomann, R., Hofmeister, H., Tromp, M., Richtering, W. and Mecking, S. (2004) Shape-selective synthesis of palladium nanoparticles stabilized by highly branched amphiphilic polymers. Advanced Functional Materials, 14 (10), 999-1004. (doi:10.1002/adfm.200400053).

Record type: Article

Abstract

Despite the broad interest in such materials, the synthesis of defined structures in the size range of 10 nm to ca. 1 micrometer ("mesoscopic") is challenging. Few routes shape-selectively afford geometrically regular structures other that the typical spherical metal particles of 1 to 10 nm. Moreover, these few routes are largely restricted to aqueous systems, however, for catalysis and other applications dispersions in organic solvents are desirable. Carbon monoxide reduction of a palladium(II) compound in combination with stabilization by (readily available) amphiphilic hyperbranched ploymers surprisingly affords dispersions of hexagonal platelets selectively with average sizes of thirty to several hundred nanometers in toluene. The size can be controlled by the polymer compositions. Transmission electron microscopy (TEM), electron diffraction, and extended x-ray absorption fine structure (EXAFS) spectroscopy demonstrate these palladium(0) platelets to be extremely thin (1 - 2 nm). Despite this high aspect ratio, the platelets prove quite shear resistant.

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More information

Published date: 2004
Keywords: hyperbranched polymers, nanoparticles, palladium, synthesis, shape controlled

Identifiers

Local EPrints ID: 46691
URI: http://eprints.soton.ac.uk/id/eprint/46691
ISSN: 1616-301X
PURE UUID: bd87078b-406a-4d97-9bc2-ddac321d444e

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Date deposited: 16 Jul 2007
Last modified: 15 Mar 2024 09:26

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Contributors

Author: U. Schlotterbeck
Author: C. Aymonier
Author: R. Thomann
Author: H. Hofmeister
Author: M. Tromp
Author: W. Richtering
Author: S. Mecking

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