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Directed Immobilization Of Janus-AuNP In Heterometallic Nanogaps: A Key Step Toward Integration Of Functional Molecular Units In Nanoelectronics

N. Babajani, C. Kaulen, Melanie Homberger, M. Mennicken, R. Waser, U. Simon, S. Karthäuser
Published 2014 · Chemistry

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Forming reliable and reproducible molecule–nanoelectrode contacts is one of the key issues for the implementation of nanoparticles as functional units into nanoscale devices. Utilizing heterometallic electrodes and Janus-type nanoparticles equipped with molecules allowing selective binding to a distinct electrode material represents a promising approach to achieve this goal. Here, the directed immobilization of individual Janus-type gold nanoparticles (AuNP) between heterometallic electrodes leading to the formation of asymmetric contacts in a highly controllable way is presented. The Janus-AuNP are stabilized by two types of ligands with different terminal groups on opposite hemispheres. The heterometallic nanoelectrode gaps are formed by electron beam lithography in combination with a self-alignment procedure and are adjusted to the size of the Janus-AuNP. Thus, by choosing adequate molecular end group/metal combinations, the immobilization direction of the Janus-AuNP is highly controllable. These resul...
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