Fabrication of GaN nanowires and nanoribbons by a catalyst assisted vapor-liquid-solid process

Subhajit Biswas, Soumitra Kar, Tandra Ghoshal, Vishal D. Ashok, Supriya Chakrabarti, Subhadra Chaudhuri

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32 Citations (Scopus)

Abstract

Wurtzite GaN nanowires and nanoribbons were produced directly from Ga metal by an Au catalyst assisted thermal evaporation process in a flowing ammonia atmosphere. We have investigated the effect of different experimental parameters on the morphology of the nanoforms. The diameters of the nanowires were varied between 20 and 40 nm while the widths of the nanoribbons were within 100-250 nm. Microstructural studies by TEM reveals the role of vapor-liquid-solid process in the nucleation of GaN nanoforms. The evolution of the ribbon like morphology was attributed to the vapor-solid process. Photoluminescence study showed UV-blue emission from the GaN nanostructures. Field emission studies indicated the possibility of these materials to be used as the cathode materials in field emission based devices.

Original languageEnglish
Pages (from-to)428-436
Number of pages9
JournalMaterials Research Bulletin
Volume42
Issue number3
DOIs
Publication statusPublished - 22 Mar 2007

Keywords

  • A. Nanostructures
  • A. Nitrides
  • B. Crystal growth
  • C. Electron microscopy
  • D. Luminescence

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