Approaching the ideal elastic strain limit in silicon nanowires

Sci Adv. 2016 Aug 17;2(8):e1501382. doi: 10.1126/sciadv.1501382. eCollection 2016 Aug.

Abstract

Achieving high elasticity for silicon (Si) nanowires, one of the most important and versatile building blocks in nanoelectronics, would enable their application in flexible electronics and bio-nano interfaces. We show that vapor-liquid-solid-grown single-crystalline Si nanowires with diameters of ~100 nm can be repeatedly stretched above 10% elastic strain at room temperature, approaching the theoretical elastic limit of silicon (17 to 20%). A few samples even reached ~16% tensile strain, with estimated fracture stress up to ~20 GPa. The deformations were fully reversible and hysteresis-free under loading-unloading tests with varied strain rates, and the failures still occurred in brittle fracture, with no visible sign of plasticity. The ability to achieve this "deep ultra-strength" for Si nanowires can be attributed mainly to their pristine, defect-scarce, nanosized single-crystalline structure and atomically smooth surfaces. This result indicates that semiconductor nanowires could have ultra-large elasticity with tunable band structures for promising "elastic strain engineering" applications.

Keywords: Silicon nanowire; deep ultra-strength; elastic strain engineering; elasticity; ideal strength; nanomechanics; room temperature; tensile strain.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Elasticity*
  • Electronics
  • Nanotechnology*
  • Nanowires / chemistry*
  • Particle Size
  • Semiconductors
  • Silicon / chemistry*
  • Stress, Mechanical
  • Temperature
  • Tensile Strength

Substances

  • Silicon