Stretching graphene gives quantum dots

Stretching graphene gives quantum dots – Graphene’s electronic structure is the subject of much study but it seems that this can be altered by the very scanning tunnelling microscopy (STM) tips used to probe it. When graphene is normally scanned by STM it’s supported by a substrate-like silica, but researchers decided to lift their graphene off its support and instead suspend it in the air. The idea behind the research was to remove interference from the support, but it also meant that the STM tip could deform the graphene lattice, creating a localised strain field. It turns out that that deformation is enough to separate the electronic states of the area, and with enough deformation create a quantum dot within the bulk lattice. Reference: J. Stroscio et al, Science 22 June 2012: Vol. 336 no. 6088 pp. 1557-1561 DOI: 10.1126/science.1220335

Stretching graphene gives quantum dots – Graphene’s electronic structure is the subject of much study but it seems that this can be altered by the very scanning tunnelling microscopy (STM) tips used to probe it. When graphene is normally scanned by STM it’s supported by a substrate-like silica, but researchers decided to lift their graphene off its support and instead suspend it in the air. The idea behind the research was to remove interference from the support, but it also meant that the STM tip could deform the graphene lattice, creating a localised strain field. It turns out that that deformation is enough to separate the electronic states of the area, and with enough deformation create a quantum dot within the bulk lattice. Reference: J. Stroscio et al, Science 22 June 2012: Vol. 336 no. 6088 pp. 1557-1561 DOI: 10.1126/science.1220335

Author: Robert Slinn

Robert Slinn is ChemSpy's guest columnist. You can read his chemical news updates under the banner "Slinn Pickings". Robert is a Chartered Chemist (CChem), Member of the Royal Society of Chemistry (MRSC) and is a Visiting Researcher in the Department of Chemistry at the University of Liverpool. He has extensive experience in R&D: synthesis, analysis and analytical methods development; troubleshooting, consultancy, and teaching/training methods in industry and in academia. Robert is also 'Physical Methods' author for the Specialist Periodical Report series 'Organophosphorus Chemistry', published by Royal Society of Chemistry, Cambridge, UK. Robert has worked alongside David on the Bedside Book of Chemistry and a major Thomson-Reuters report on the state of the pharmaceutical industry for the 2011 International Year of Chemistry

1 thought on “Stretching graphene gives quantum dots”

  1. I wonder if a suitably deformed lattice could be attached to a substrate with physical or electromagnetic properties that would maintain the deformation.

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