The growth of GaN nanowires on sapphire substrates coated with Ni or Pt catalyst was investigated to address their behavior in a vapor-liquid-solid mechanism. Our observations revealed that both the two catalysts, which led to the growth of nanowires, behave rather complex, including diffusion and re-agglomeration from the coated films to the surface of the micro crystals that is formed in an early stage of growth by vapor-solid mechanism. GaN nanowires have a diameter and length of ~100 nm and several tens of micrometers, respectively, and tend to align epitaxially on the facets of the micro crystals.
Bibliographical noteFunding Information:
This research was supported by a grant from the National Research Laboratory program ( R0A-2007-000-20075-0 ) and Nano R&D program ( 2009-0082724 ) through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science & Technology and Seoul Research and Business Development Program (10816). E. Oh acknowledges the Korea Science and Engineering Foundation (KOSEF) grant funded by the Korea government (MEST) (Grant No. R01-2008-000-20756-0 ).
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering