Evidence for formation of multi-quantum dots in hydrogenated graphene

Chiashain Chuang, Reuben K. Puddy, Malcolm R. Connolly, Shun-Tsung Lo, Huang De Lin, Tse Ming Chen, Charles G. Smith, Chi Te Liang

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11 Scopus citations

Abstract

We report the experimental evidence for the formation of multi-quantum dots in a hydrogenated single-layer graphene flake. The existence of multi-quantum dots is supported by the low-temperature measurements on a field effect transistor structure device. The resulting Coulomb blockade diamonds shown in the color scale plot together with the number of Coulomb peaks exhibit the characteristics of the so-called 'stochastic Coulomb blockade'. A possible explanation for the formation of the multi-quantum dots, which is not observed in pristine graphene to date, was attributed to the impurities and defects unintentionally decorated on a single-layer graphene flake which was not treated with the thermal annealing process. Graphene multi-quantum dots developed around impurities and defect sites during the hydrogen plasma exposure process.

Original languageEnglish
Article number459
JournalNanoscale Research Letters
Volume7
DOIs
StatePublished - 17 Sep 2012

Keywords

  • Coulomb peaks
  • Multi-quantum dots
  • Single-layer graphene flake

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