title: Self-assembled silicon nanotubes under supercritically hydrothermal conditions.
abstract: Self-assembled silicon nanotubes with one-dimensional structure have been synthesized from silicon monoxide powder under supercritically hydrothermal conditions with a temperature of 470 degrees C and a pressure of 6.8 MPa. The silicon nanotubes were identified by transmission electron microscopy and high-resolution transmission electron microscopy. The results show that the silicon nanotubes (SiNT) have closed caps. The structures of the silicon nanotubes are hollow inner pore, crystalline silicon wall layers with a 0.31 nm interplanar spacing and 2-3 nm amorphous silica outer layers. Pure crystalline silicon nanotubes survive after etching the silicon nanotubes with 5% HF acid for enough time to imply that the self-assembled silicon nanotubes are stable. A possible theoretical reason for the growth of SiNTs from SiO under supercritically hydrothermal conditions was also proposed.
authors.affiliation: College of Materials Science and Engineering, Hunan University, Changsha 410082, People's Republic of China. yhtang@hnu.cn
authors.forename: Y H
authors.initials: YH
authors.lastname: Tang
authors.forename: L Z
authors.initials: LZ
authors.lastname: Pei
authors.forename: Y W
authors.initials: YW
authors.lastname: Chen
authors.forename: C
authors.initials: C
authors.lastname: Guo