Structural evolution and graphitization of metallorganic-Pt suspended nanowires under high-current-density electrical test

Gazzadi, Gian Carlo; Frabboni, Stefano
April 2009
Applied Physics Letters;4/27/2009, Vol. 94 Issue 17, p173112
Academic Journal
We present a real-time investigation of the dramatic structural evolution occurring in metallorganic-Pt suspended nanowires (SNWs) (20 nm size) under high-current-density electrical test. SNWs are fabricated by electron beam-induced deposition and consist of Pt nanograins (2–3 nm) embedded in a carbonaceous matrix. As current increases, the Pt–C granular material transforms into Pt-depleted, graphitized C with a two-stage process. First, Pt coalescence into big grains (10–15 nm) is observed, then, for current density approaching 107 A/cm2, grains are depleted by Pt electro- and thermomigration, leaving a graphitized C matrix. The graphitic-C wire eventually breaks forming a nanosize gap.


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