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 language | English |
|---|---|
| Pages (from-to) | 428-436 |
| Number of pages | 9 |
| Journal | Materials Research Bulletin |
| Volume | 42 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published (in print/issue) - 22 Mar 2007 |
Funding
The authors thank Department of Science and Technology (DST), New Delhi, for financial assistance under the programme of Nano Science and Technology Initiative. Two of the authors (T. G. and V. D. A.) express their sincere gratitude to the Council of Scientific and Industrial Research (CSIR, Government of India) for sanction of research fellowship during the tenure of the work.
Keywords
- A. Nanostructures
- A. Nitrides
- B. Crystal growth
- C. Electron microscopy
- D. Luminescence