Regensburg 2007 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

SYSE: Symposium Strain-Engineering for New Functional Structures

SYSE 1: Strain engineering in semiconductors

SYSE 1.1: Hauptvortrag

Montag, 26. März 2007, 14:30–15:00, H1

Wavy and Buckled Nanoribbons and Nanotubes: Mechanics and Applications — •John Rogers — University of Illinois at Urbana/Champaign, 1304 W. Green St, Urbana, IL 61801, USA

Control over the compositions, shapes, spatial locations and/or configurations of semiconductor nanowires, nanoribbons and other nanostructures is important for nearly all applications of these materials. Although methods exist for defining some of these properties, there are relatively few approaches for controlling the two- and three-dimensional (2D and 3D) layouts of individual elements. This talk describes a mechanical strategy for creating certain classes of 3D shapes in nanoribbons that would be difficult to generate in other ways. The approach involves geometrically controlled strain coupling of these elements to elastomeric substrates. The structures that can be produced range from small amplitude, periodic one and two dimensional *wavy* geometries to periodic or aperiodic large scale buckled formations. We show that these configurations can be created in nanoribbons and nanomembranes of GaAs and Si and in individual single walled carbon nanotubes, and that these geometries can be described quantitatively with analytical and finite element models of the mechanics. As one application example, we show that certain of these structures provide a route to electronics (and optoelectronics) with extremely high levels of stretchability (up to ~100%), compressibility (up to ~25%) and bendability (with curvature radius down to ~5 mm).