Silica-sheathed pyrrotite nanowires: Synthesis and mechanism.
We have studied the growth of silica-sheathed 3C-Fe7S8 products on silicon substrates with FeCl2 and sulfur precursors at the temperature region of 600-800 degrees C. On the basis of the crystal structure of Fe7S8, we have proposed a model including the kinetic competition of the adsorption of silica species on Fe2-Fe3-Fe4 units at the 4Fe layer and on the Fe2-Fe3-Fe4-Fe5 units parallel to the c-axis. Using this model, we have not only explained all the experimental phenomena but also especially prepared Fe7S8 nanowires at 650 degrees C by introducing water into the reaction system.
Zhang
Hao-Xu
HX
Department of Chemistry, The Key Laboratory of Atomic and Molecular Nanoscience (Ministry of Education), Tsinghua University, National Center for Nanoscience and Nanotechnology, Beijing 100084, People's Republic of China.
Ge
Jian-Ping
JP
Wang
Jin
J
Wang
Zhe
Z
Yu
Da-Peng
DP
Li
Ya-Dong
YD