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MM: Fachverband Metall- und Materialphysik

MM 23: Electron Microscopy I - Nanomaterials

MM 23.1: Vortrag

Dienstag, 1. April 2014, 10:15–10:30, IFW D

Analytical EDX studies at different temperatures of Boron/Ni composite nanowires — •Daniela Sudfeld, Bastian Barton, Oleg Lourie, and Bert Freitag — FEI Electron Optics B. V., Eindhoven, The Netherlands

Analytical EDX studies at different temperatures were performed in a S/TEM, FEI Talos[TM] with ChemiSTEM[TM] Technology [1]. Fast chemical maps of B/Ni composite nanowires on nanometer scale by EDX (energy-dispersive X-ray spectroscopy) were done with the new Velox[TM] software. Successful synthesis of crystalline nanowires composed of the refractory light materials such as Boron can enable novel applications for nanoelectronics [2-4]. Boron/Nickel composite nanostructures were prepared by a CVD-based synthetic procedure with a Ni-based compound catalyst; naturally blended with high conductivity and refraction index. The properties of this binary nanomaterial at room temperature are compared to those achieved from heating experiments with temperatures up to 1000 deg C. 2D-3D EDX chemical mappings show clearly the core-shell structure of the wires: B in the shell and Ni in the core. This is amplified at elevated temperatures of ca. 500 deg C. At ca. 1,000 deg C EDX maps reveal also that Ni vanishes from the core, leaving behind hollow B nanowire (nanotube) structures. [1] P. Schlossmacher et al., Microscopy Today 18(4) (2010) 14. [2] CJ Otten, et al., J Am Chem Soc. 2002 May 1;124(17):4564. [3] D. Wang et al., APL 2003, 183(25):5280. [4] W. Ding et al., Mech, Comp. Sci. and Techn. 2006, 66:1109.