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HL: Halbleiterphysik

HL 42: Quantum dots and wires: Preparation and characterization I

HL 42.1: Vortrag

Donnerstag, 30. März 2006, 11:00–11:15, POT 51

Silicon Dioxide Nanowires with Embedded Au/Si Nanoparticles — •Florian M. Kolb, Andreas Berger, Herbert Hofmeister, Eckhard Pippel, Margit Zacharias, and Ulrich Gösele — Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle(Saale)

By combining SiO evaporation with the VLS mechanism (1), apart from crystalline silicon nanowires with an amorphous oxide shell, also amorphous nanowires with chains of periodically embedded nanoparticles can be observed. We found that this unusual nanowire morphology consists of pure SiO₂ with embedded Au/Si nanoparticles, using Energy-Dispersive X-Ray Spectroscopy (EDXS), Electron Energy-Loss Spectroscopy (EELS) and High-Resolution TEM (HRTEM). Experimental results suggest that the formation of the nanoparticle chains is induced by oxygen. Combined with the SiO-VLS growth, we propose a model for the formation mechanism of the nanoparticle chains, in which the nanoparticles originate from the liquid Au/Si nanowire tip. Possible applications for this special nanowire morphology are discussed.
(1) F. M. Kolb, H. Hofmeister, R. Scholz, M. Zacharias, U. Gösele, D. D. Ma, S.-T. Lee. J. Electrochem. Soc. 151 (7) G472 (2004)