Electrical characteristics of individual FeNiCo-Au core-shell nanowires integrated into microelectrodes on plastic substrate

M. Beheshti, X. Geng, J. Choi, E. Podlaha-Murphy, S. Park
Louisiana State University,
United States

Keywords: core-shell nanowires, electrical transport measurement, transparent electronics, polymer microchips

Summary:

Synthesis, characterization and integration of single metallic nanowires with enhanced electrical and mechanical properties into plastic substrate is a vital task for the development of transparent/flexible electronics as well as nanosensors. Among the metallic nanowires, heterogeneous core-shell nanowires can provide benefits of more than one nanowire material and thus create unique properties to solve the drawbacks of respective nanowire materials. In this paper, we will show synthesis, electrical characteristics, and integration of a new FeNiCo-Au core-shell nanowire consisting of a mechanically strong FeNiCo core and highly conductive Au shell, promising both enhanced mechanical properties and electrical conductivity. A home-built alignment system based on an optical microscope and a xyz piezo positioner was developed to transfer individual nanowires into microelectrodes formed in plastic substrate with high accuracy. Electrical conductance of single FeNiCo-Au core shell nanowires was measured using the two-probe electrode. The results were compared to that of FeNiCo nanowires. By decoupling the conductance through respective FeNiCo core and Au shell in the FeNiCo-Au core shell nanowire, the conductivity of the Au shell was obtained, from which the thickness of the Au shell was estimated to be 6.2 nm. Such a thin Au shell is responsible for passage of 84% of electrical current in the FeNiCo-Au core shell nanowire.