Electron microscopy study of novel Pt nanowires synthesized in the spaces of silica mesoporous materials.
Structures of Pt-nanowires, synthesized in channels of silica mesoporous materials MCM-41, SBA-15 and MCM-48, were investigated by transmission electron microscopy. One dimensional (1D) Pt-nanowires were formed inside the channels of the MCM-41, and were single crystals with a length of several tens to several hundreds nanometers and a diameter of ca. 3 nm pt-nanowires synthesized in SBA-15 formed a new 3D-network following 3D-pore geometry of SBA-15; that is, the main 1D-channels are interconnected to each other through randomly distributed tunnels. These Pt-nanowires showed a well single crystalline. MCM-48 has two non-intersecting chiral channels, and Pt-networks were mostly formed in one of the two channels. Therefore the networks were also chiral; however, the chirality of Pt-networks remained to be determined. It was shown that all Pt-nanowires were formed following the channel geometries of silica mesoporous materials used.
Terasaki
Osamu
O
Department of Physics & CIR, Tohoku University, Sendai 980-8578, Japan.
Liu
Zheng
Z
Ohsuna
Tetsu
T
Shin
Hyun June
HJ
Ryoo
Ryong
R
D003460:Crystallization; D004559:Electric Wiring; D004581:Electronics; D021621:Imaging, Three-Dimensional; D008854:Microscopy, Electron / Q000379:methods; D036103:Nanotechnology; D010984:Platinum / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*
D010984:Platinum; D012822:Silicon Dioxide