Structural transitions in electron beam deposited Co–carbonyl suspended nanowires at high electrical current densities
作者： Gian Carlo Gazzadi , Stefano Frabboni
DOI: 10.3762/BJNANO.6.134
关键词: Crystallite 、 Electromigration 、 Spectroscopy 、 Nanotechnology 、 Current density 、 Electron beam-induced deposition 、 Nanowire 、 Transmission electron microscopy 、 Analytical chemistry 、 Atom 、 Materials science
摘要: Suspended nanowires (SNWs) have been deposited from Co-carbonyl precursor (Co2(CO)8) by focused electron beam induced deposition (FEBID). The SNWs dimensions are about 30-50 nm in diameter and 600-850 length. as-deposited material has a nanogranular structure of mixed face-centered cubic (FCC) hexagonal close-packed (HCP) Co phases, composition 80 atom % Co, 15 O 5 C, as revealed transmission microscopy (TEM) analysis energy-dispersive X-ray (EDX) spectroscopy, respectively. Current (I)-voltage (V) measurements with current densities up to 10(7) A/cm(2) determine different structural transitions the SNWs, depending on I-V history. A single measurement sudden burst leads polycrystalline FCC extended over whole wire. Repeated at increasing currents produce wires split structure: one half is other graphitized C. breakdown density found 2.1 × A/cm(2). role played resistive heating electromigration these discussed.
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