MPI für Festkörperforschung / FKF Publikationen 2004 |
|Spatially selective nucleation of metal clusters on the tobacco mosaic virus|
|Authors:||Knez, M.; Sumser, M.; Bittner, A. M.; Wege, C.; Jeske, H.; Martin, T. P.; Kern, K.|
|Date of Publication (YYYY-MM-DD):||2004|
|Title of Journal:||Advanced Functional Materials|
|Issue / Number:||2|
|Review Status:||not specified|
|Abstract / Description:||Tobacco mosaic virus (TMV) is a very stable nanotube complex of a
helical RNA and 2130 coat proteins. The special shape makes it an
interesting nano-object, especially as a template for chemical
reactions. Here we use TMV as a chemically functionalized template for
binding metal ions. Different chemical groups of the coat protein can
be used as ligands or to electrostatically bind metal ions. Following
this activation step, chemical reduction and electroless plating
produces metal clusters of several nanometers in diameter. The clusters
are attached to the virion without destroying its structure. Gold
clusters generated from an ascorbic acid bath bind to the exterior
surface as well as to the central channel of the hollow tube. Very high
selectivity is reached by tuning Pd-II and Pt-II activations with
phosphate: When TMV is first activated with Pd-II, and thereafter
metallized with a nickel-phosphinate bath, 3 nm nickel clusters grow in
the central channel; when TMV from phosphate-buffered suspensions is
employed, larger nickel clusters grow on the exterior surface.
Phosphate buffers have to be avoided when 3 nm nickel and cobalt wires
of several 100 nm in length are synthesized from borane-based baths
inside the TMV channel. The results are discussed with respect to the
inorganic complex chemistry of precursor molecules and the distribution
of binding sites in TMV.
|External Publication Status:||published|
|Communicated by:||Michaela Asen-Palmer|
|Affiliations:||MPI für Festkörperforschung|
|External Affiliations:||Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
; Univ Stuttgart, Dept Mol Biol & Plant Virol, Inst Biol, D-70550 Stuttgart, Germany.
|Identifiers:||ISI:000189149200002 [ID No:1] |
ISSN:1616-301X [ID No:2]
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