Nanotube Formation from Self-Bending Nanofilms Driven by Atomic-scale Surface Stress Imbalance

ORAL

Abstract

We present a novel mechanism for fabricating nanotubes by self-bending of nanofilms under intrinsic surface stress imbalance due to surface reconstruction. A freestanding Si nanofilm may spontaneously bend itself into a nanotube without external stress load, and a bilayer SiGe nanofilm may bend into a nanotube with Ge as the inner layer, opposite of the normal bending configuration defined by misfit strain. Such rolled-up nanotubes can accommodate a high level of strain, even beyond the magnitude of lattice mismatch, greatly modifying the tube electronic and optoelectronic properties.

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Authors

  • Ji Zang

    Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112, University of Utah

  • Minghuang Huang

    Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112

  • Feng Liu

    Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112, University of Utah, Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112 USA, Department of Materials Science and Engineering, Univeristy of Utah, Salt Lake City, UT 84112, Department of Material Science and Engineering, University of Utah, Salt Lake City, UT 84112-0610, USA, Department of Material Science and Engineering, University of Utah, Salt Lake City, UT 84112