The classic epitaxial thin film growth has been utilized in its super confined form in the metal-catalyzed Vapor-Liquid-Solid (VLS) process where the metal catalyst acts as a material concentrator resulting in a rapid and localized nanocrystal growth at a specific site. As an extension of this approach, previously, we as well as others demonstrated the surface-directed VLS growth of nanowires, which results in horizontal growth of nanowires on a single crystal substrate [1-3]. In this presentation we discuss interactions of Au catalyst droplet on different III-V semiconductor substrates to grow different 1D-nanostructures including nanowires. Results also are presented on epitaxial relationship between the epilayer and the underlying substrate; however, despite what is observed in the non-VLS lateral growth of nanowires, here we show that the nanowire growth direction is orthogonal to the lattice match direction. We also demonstrate a rare example of Au droplet reaction with the semiconductor surfaces that results in volatile reaction products rendering formation of oriented assemblies of inverted nanowires. References [1] B. Nikoobakht, C. A. Michaels, S. J. Stranick, and M. D. Vaudin, "Horizontal growth and in situ assembly of oriented zinc oxide nanowires," Applied Physics Letters, vol. 85, pp. 3244-3246, Oct 11 2004. [2] S. A. Fortuna, J. Wen, I. S. Chun, and X. Li, "Planar GaAs Nanowires on GaAs (100) Substrates: Self-Aligned, Nearly Twin-Defect Free, and Transfer-Printable," Nano Letters, vol. 8, pp. 4421-4427, 11/12 2008. [3] D. Tsivion, M. Schvartzman, R. Popovitz-Biro, P. von Huth, and E. Joselevich, "Guided Growth of Millimeter-Long Horizontal Nanowires with Controlled Orientations," Science, vol. 333, pp. 1003-1007, Aug 2011.

Formation of 1D-nanostructures using surface-directed vapor-liquid-solid growth process

249th National Meeting (2015)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.