16 September 2014 SAD-GLAD core-shell nanorod arrays for fuel cell, photodetector, and solar cell electrode applications
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Abstract
The glancing angle deposition (GLAD) technique, unlike a conventional physical vapor deposition (PVD) process, incorporates a flux of atoms that are obliquely incident on a tilted and rotating substrate. Instead of a continuous thin film coating, these atoms can form arrays of three-dimensional nanostructures due to a shadowing effect. By simply controlling the deposition angle and substrate rotation speed, nanostructures of a large variety of materials in the shapes of rods, screws, or springs can be obtained easily that are otherwise difficult to produce by conventional lithographical techniques. In this study, a brief overview of the growth mechanisms of GLAD nanostructures is presented. In addition, a new small angle deposition (SAD) technique as a simple means of conformally coating nanorod or nanowire arrays is described. SAD utilizes a small tilt angle during PVD on nanostructured substrates, which allows the effective exposure of nanorod sidewalls to the incoming flux and leads to enhanced thin film conformality. In this work, some recent results on core-shell nanorod arrays obtained by coating GLAD nanorods with a SAD shell will be presented. It will be shown that core-shell nanostructured geometries obtained by the simple SAD-GLAD method can significantly enhance catalyst activity for fuel cell electrodes, and charge carrier collection efficiency in photoconductive/semiconductor nanostructured materials.
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H. Cansizoglu, H. Cansizoglu, M. F. Cansizoglu, M. F. Cansizoglu, M. Yurukcu, M. Yurukcu, W. J. Khudhayer, W. J. Khudhayer, N. Kariuki, N. Kariuki, D. J. Myers, D. J. Myers, A. U. Shaikh, A. U. Shaikh, T. Karabacak, T. Karabacak, } "SAD-GLAD core-shell nanorod arrays for fuel cell, photodetector, and solar cell electrode applications", Proc. SPIE 9174, Nanoepitaxy: Materials and Devices VI, 917411 (16 September 2014); doi: 10.1117/12.2063117; https://doi.org/10.1117/12.2063117
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