2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Catalyst Selection for ZnO Nanowire Growth

A.V. Davydov, B. Nikoobakht, D. Josell, W.J. Boettinger, I. Levin, L. Robins, N. Sanford and J. Maslar
National Institute of Standards and Technology, US

Keywords:
ZnO nanowires, phase diagram, VLS growth

Abstract:
ZnO nanowires (NWs) are commonly grown by the vapor-liquid-solid method utilizing nanometer-sized catalytic metal islands as nucleation sites. Metal catalysts are often selected arbitrarily with no correlation to the resulting ZnO NW properties. We report systematic assessment of how Group IB metals and alloys influence growth and structural/electronic properties of ZnO NWs. An experimental library was designed using M-Zn-O (M=Au, Ag, Cu) phase diagram and included 3 catalytic metal compositions (Au, Ag and AuCu) and two growth temperatures (850C and 950C). The library elements were deposited on GaN/sapphire substrate followed by annealing (to study metal dewetting behavior) and by ZnO growth. The resulting set of metal islands and ZnO NWs was characterized structurally and spectroscopically. It was found that the ZnO NW growth was significantly influenced by the nature of the catalytic metal and its dewetting behavior on GaN/sapphire substrate: the comprehensive correlation of ZnO structural/spectroscopic data with catalytic metal compositions will be presented.

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