Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-12-01

Journal: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE

Included Journals: Scopus、EI、SCIE

Volume: 210

Issue: 12

Page Number: 2689-2692

ISSN: 1862-6300

Key Words: Au; Ni catalyst; GaN; nanowires; NH3; N-2 flow rate

Abstract: GaN nanowires (NWs) were grown on Ni- and Au/Ni-coated Si (100) substrate by chemical vapor deposition via reaction of metallic Ga and NH3. It was found that the Au/Ni layer tends to form liquid droplets with more uniform size distribution and regular spherical shape under annealing, which facilitates the growth of straight and long NWs. The effects of NH3/N-2 ratio on NW growth are different for Ni and Au/Ni catalysts, due to the competition between the vapor-solid (VS) and vapor-liquid-solid (VLS) growth. The XRD analyses indicate that with decreasing NH3 flow rate, [0001] axial growth becomes dominant with the formation of NiGa4 catalyst.