AVS 58th Annual International Symposium and Exhibition
    Advanced Surface Engineering Division Tuesday Sessions
       Session SE+TF-TuA

Paper SE+TF-TuA8
Heterogeneous Nanorod Arrays Fabrication by a Two-Source Dynamic Shadowing Growth System

Tuesday, November 1, 2011, 4:20 pm, Room 104

Session: Glancing Angle Deposition (GLAD) II
Presenter: Yiping Zhao, University of Georgia
Authors: Y.P. He, University of Georgia
Y.P. Zhao, University of Georgia
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There are increasing interests in designing and engineering nanostructured materials to improve their performances in various applications. Among many nanostructure fabrication and synthesis techniques, the dynamic shadowing growth can offer an unique advantage by sculpturing nanorod-based structures through computer programing using the self-shadowing effect. The geometry shadowing effect is the dominant growth mechanism resulting in the formation of topologically engineered nanostructure arrays, such as tilted, C-shape, S-shape, L-shape, zigzag, matchstick, helical, and vertical nanorods, by programming the substrate rotation in polar and/or azimuthal directions. Such a topological design can be further advanced through compositional engineering. A co-deposition provides a way to evaporate two or more materials simultaneously to form homogeneous composite/doped nanostructures by controlling the relative ratio of the deposition rates of two or more sources. Recently, we have constructed a two-source dynamic shadowing growth (DSG) and demonstrated that various topologically and compositionally engineered nanostructures can be designed by multilayer glancing angle deposition (GLAD) and/or glancing angle co-deposition (GLACD) techniques. Here, we will highlight some of the recent progress in designing heterostructured nanorod arrays through a two-source dynamics shadowing growth system. In particular, Vanadium catalyst doped Mg nanorod arrays fabricated through the oblique angle co-deposition show very different morphology compared to the Mg nanoblades formed by oblique angle deposition. The kinetics of the hydrogen storage performance of the doped Mg nanostructures can be greatly improved compared to that of the Mg nanoblades. The composition-graded CuSi nanorod array can be designed through dynamically changing the deposition rates of the two sources. The Li+ battery performance of these nanostructures compared to that of pure Si nanorods will be discussed.