Nanowire-based electrodes have been fabricated using a variety of engineering materials using both bottom-up and top-down nanomanufacturing processes (Hu et al. 1999; Yogeswaran and Chen, 2008). A detailed review of nanomanufacturing processes for nanowire fabrication can be found elsewhere (Hu et al. 1999). Nanowires can exhibit circular, hexagonal, and even triangular cross-sections. The nanowire aspect ratio, defined as the ratio of the length to width, often ranges from 1 to greater than 10 (Hu et al. 1999; Vaseashta and Dimova-Malinovska, 2005; Wanekaya et al. 2006).