Aligned Si(3)N(4)@SiO(2) coaxial nanocables derived from a polymeric precursor.
Well-aligned coaxial nanocables, composed of a crystalline alpha-Si(3)N(4) inner core and amorphous SiO(2) outer shell, were prepared on silicon substrates by pyrolysis of a preceramic polymer (perhydropolysilazane) with iron as catalyst. The nanocables have high density, and the longest nanocable can be up to millimeters. Photoluminescence measurement reveals a strong ultraviolet emission band centered at 360 nm and a weaker visible-light emission at 625 nm. The growth mechanism of the nanocables is discussed in detail.
Fu
Xiuli
X
Faculty of Science, Beijing University of Posts and Telecommunications, Beijing 100876, People's Republic of China. xiulifu@bupt.edu.cn
Peng
Zhijian
Z
Zhu
Na
N
Wang
Chengbiao
C
Fu
Zhiqiang
Z
Qi
Longhao
L
Miao
Hezhuo
H