Structure of the thinnest most stable semiconducting and insulating nanotubes of SiOx (x=1,2)

Abhishek Kumar Singh, Vijay Kumar, Yoshiyuki Kawazoe

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The ability of silica to form different phases can be used to stabilize its nanostructures. Here we explore the stability of thin nanotubes of SiOx (x=1 and 2) using ab initio calculations with the generalized gradient approximation for the exchange-correlation energy. We find that the pentagonal nanotubes are energetically most stable. The pentagonal SiO nanotube is a semiconductor with the largest calculated band gap of 0.90 eV, which is close to the value for bulk Si. The SiO2 nanotubes are, however, insulating similar to bulk silica and could be promising as the thinnest insulating layers for nanodevices. Our results demonstrate that we can get the most important circuit elements for nanoelectronics, namely semiconducting, as well as insulating nanotubes based on silicon in the subnanometer regime.

Original languageEnglish
Article number155422
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number15
DOIs
Publication statusPublished - 2005 Oct 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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