Synthesis of GaN nanorods using Tantalum catalyst by magnetron sputtering Hong Li, Chengshan Xue, Huizhao Zhuang, Jinhua Chen, Zhaozhu Yang and Lixia Qin Eur. Phys. J. Appl. Phys., 40 2 (2007) 129-131 Published online: 31 October 2007 DOI: 10.1051/epjap:2007146