SINGLE CRYSTAL TUNGSTEN OXIDE NANOTUBE, SINGLE CRYSTAL TUNGSTEN OXIDE NANOWIRE, AND METHOD FOR MANUFACTURING THEM

摘要

PROBLEM TO BE SOLVED: To provide single crystal tungsten oxide nanotubes and single crystal tungsten oxide nanowires which are useful as functional materials used in displays for information-apparatuses, various sensors, recording devices, or the like; and to provide methods for manufacturing them.;SOLUTION: The single crystal tungsten oxide nanotubes, each being a tubular single crystal tungsten oxide having an outer diameter of 150-350 nm, an inner diameter of 50-150 nm and a length of ≥1 μm, are manufactured by heating a tungsten foil to 1,000-1,050°C and a tantalum wafer to 600-700°C, then keeping them at respective temperatures for 15-25 min under a pressure of ≤0.2 Torr, and further keeping them for 30-60 min after controlling the pressure to be ≤10 Torr. The single crystal tungsten oxide nanowires, each being a linear single crystal tungsten oxide having a diameter of 20-100 nm and a length of ≥1 μm, are manufactured by heating a tungsten foil to 1,000-1,050°C and a tantalum wafer to 600-700°C and keeping them at the respective temperatures for 50-80 min under a pressure of 8-15 Torr.;COPYRIGHT: (C)2005,JPO&NCIPI