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Conference Paper

Cu-nanoclusters produced on AuCu-Alloys with an electrochemical scanning tunneling microscope

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Maupai, S., Dakkouri, A. S., Stratmann, M., & Schmuki, P. (2002). Cu-nanoclusters produced on AuCu-Alloys with an electrochemical scanning tunneling microscope. In R. Singh, H. Hofmann, M. Senna, R. Partch, & M. Muhammed (Eds.), Nanoparticulate Materials (pp. 79-84).

Cite as: https://hdl.handle.net/21.11116/0000-0008-2E88-C
Cu-nanoclusters can be produced in an electrochemical environment by
tip-induced metal deposition using an electrochemical scanning tunneling
microscope (EC-STM). These clusters, consisting of 100-1000 atoms only,
show a surprising stability against anodic oxidation. The clusters,
which are 2-3 atomic layers in height dissolve slowly when the applied
potential is increased step by step to 200 mV positive of the reversible
Nernst potential for ``normal{''} copper dissolution. The presented work
gives evidence that the unusual stability of the clusters could be a
consequence of interfacial alloying between the cluster and the
underlying substrate. In order to study these effects Cu-nanoclusters
have been produced on pure gold substrates and on carefully prepared
Au3Cu(111)-substrates. This work compares the results obtained on both