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Nano-oxide Formation by In Situ Oxidation of Copper Thin Films

Oxidation is not only critical for environmental stability but also presents a fascinating opportunity for nano-oxide processing. The ability to form oxide nanostructures of controlled shapes , sizes and distributions have tremendous potential for a wide variety of applications – ranging from novel electronic, magnetic, optical performance to utilization as biological templates. Our goal is the fundamental understanding of the complex kinetics and energetics of oxidation, via in situ ultra-high vacuum transmission electron microscopy (UHV-TEM), that will provide crucial insights in tailoring corrosion resistance or oxide processing at the nanoscale. In our earlier investigations, we discovered that surfaces are key to the initial oxidation processes, where the transport, nucleation and growth of Cu2O islands on Cu(100) were controlled by the surface diffusion of oxygen [1-2]. In the present study, we are systematically investigated the effects of thermodynamic variables, such as temperature and pressure, as well as crystallographic orientation on nano-oxidation mechanisms.