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Tungsten oxide micron pipe and its preparation method

A technology of tungsten oxide and micron tubes, applied in the direction of tungsten oxide/tungsten hydroxide, etc., can solve limited problems, achieve large surface-to-volume ratio, good crystallization, and cheap raw materials

Inactive Publication Date: 2007-11-21
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently, the technology for fabricating tungsten oxide tubular structures is very limited

Method used

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  • Tungsten oxide micron pipe and its preparation method
  • Tungsten oxide micron pipe and its preparation method
  • Tungsten oxide micron pipe and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Tungsten oxide microtube and its preparation method

[0029] In this embodiment, the reaction raw materials used are general industrial tungsten (tungsten wire, tungsten sheet, etc.) and common water.

[0030] First, the tungsten substrate is electropolished to remove the oxide layer on the surface. Then rinse with clean. The shape of the tungsten substrate has no effect on the preparation of tungsten oxide microtubes. In the example shown in Figure 1, the tungsten substrate is a tungsten wire with a length of about 5mm.

[0031] 1. Load the sample

[0032] Place 10ml of water on the upwind of the heatable chamber, and place a tungsten substrate on the downwind of the heatable chamber.

[0033] 2. Pumping

[0034] After the sample is loaded into the tube-type heating furnace and sealed completely, turn on the mechanical pump to pump air, so that the pressure in the tube is less than 0.1MPa, and keep it for 5-10 minutes to check the vacuum system. The...

Embodiment 2

[0041] In this example, common industrial tungsten wire and deionized water are used as reactants, and the steps implemented are the same as those in Example 1, except that the maximum temperature is set to 1100°C for 45 minutes, and the reaction chamber The pressure in the chamber is kept at 0.35MPa, and the obtained WO 3 Microtubes are shown in Figure 6.

Embodiment 3

[0043] In this example, common industrial tungsten wire and deionized water are used as reactants, and the steps implemented are the same as those in Example 1, except that the maximum temperature is set to 1200°C for 30 minutes, and the reaction chamber The pressure in the chamber is kept at 0.45MPa, and the obtained WO 3 Microtubes are shown in Figure 7.

[0044]It can be seen from the above three examples that as long as various parameters, such as maximum temperature, pressure and holding time, are within a certain range, the prepared tungsten oxide microtubes will have the same morphology. Among them, those skilled in the art can understand that the required amount of water meets two conditions: on the one hand, it is necessary to ensure that there is a sufficiently high vapor pressure of water in the cavity during the temperature rise process; At the end of the process, the water should have been exhausted to ensure that the dehydration reaction will occur during the co...

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Abstract

A tungsten oxide micron=tube with symmetrical hexagonal shape, 1-6 microns in diameter and 5-10 microns in length is prepared through putting W substrate and water respectively in reaction cavities, filling protecting gas to remove air until the pressure is 0.35-0.45 MPa, heating at 1100-1300 deg.C for 30-45 min to grow the tungsten oxide micron-tubes WO3*XH2O on substrate, and cooling to become hexagonal micron-tubes h-WO3.

Description

technical field [0001] The invention relates to an oxide microtube and a preparation method thereof, in particular to a tungsten oxide (WO) with sixfold symmetry, good crystallization and smooth surface. 3 ) microtube and a preparation method thereof, wherein the method is to grow a tungsten oxide microstructure in situ on a tungsten substrate, which belongs to the field of crystal growth. Background technique [0002] Tungsten oxide is a typical transition metal oxide N-type semiconductor with a band gap of 2.4-2.8eV. Fully oxidized tungsten oxide usually has ReO 3 Type (Perovskite-Type) crystal structure, WO 6 The octahedron "shares" the O atoms at the top corners in space, and is arranged in a simple cubic form, so that tungsten oxide also has various crystal forms such as triclinic, monoclinic, tetragonal, and hexagonal. Even in the same crystal system, there will be several crystal phases with completely different lattice parameters. The particularity and diversity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02
Inventor 奚中和张耿民吴越郭等柱
Owner PEKING UNIV
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