Substantial narrowing on the width of “concentration window” of hydrothermal ZnO nanowires via ammonia addition

D. Sakai, K. Nagashima, H. Yoshida, M. Kanai, Y. He, G. Z. Zhang, X. X. Zhao, T. Takahashi, T. Yasui, T. Hosomi, Y. Uchida, S. Takeda, Y. Baba and T. Yanagida