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Dielectrophoretic growth of platinum nanowires: Concentration and temperature dependence of the growth velocity

: Nerowski, A.; Poetschke, M.; Bobeth, M.; Opitz, J.; Cuniberti, G.


Langmuir. The ACS journal of surfaces and colloids 28 (2012), Nr.19, S.7498-7504
ISSN: 0743-7463
ISSN: 1520-5827
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

The growth velocity of platinum nanowires in an aqueous solution of K 2PtCl 4 is investigated as a function of the metal complex concentration and temperature. The solution is specially prepared to provide mainly the neutral complex cis-[PtCl 2(H 2O) 2] for growing nanowires by dielectrophoresis. The measured growth velocities indicate diffusion-limited nanowire growth at low concentration and high temperature in qualitative agreement with a theoretical analysis that includes the diffusion of metal complexes and the dielectrophoretic force on the complexes. At concentrations greater than 100 M and low temperature, different behavior is observed, suggesting the growth rate to be limited by the deposition reaction of platinum at the nanowire tip. The enhancement of the K + concentration is found to support nanowire growth. Possible reasons for a rate limitation and for the difference between observed and calculated nanowire growth velocities are discussed.