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a hexagonal phase 3 Nanotubes and methods of making them

A technology of nanotube and hexagonal phase, applied in the field of hexagonal phase WO3 nanotube and its preparation, can solve the problem of no tubular nanostructure and the like, and achieve the effects of easy availability of raw materials, small size and high yield

Inactive Publication Date: 2016-06-15
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the literature survey is concerned, the currently prepared hexagonal phase WO 3 The morphology is mainly rod-like, nanosheets, nanowires, nanobelts and microspheres, but there are no reports of tubular nanostructures.

Method used

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  • a hexagonal phase <sub>3</sub> Nanotubes and methods of making them
  • a hexagonal phase <sub>3</sub> Nanotubes and methods of making them
  • a hexagonal phase <sub>3</sub> Nanotubes and methods of making them

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A hexagonal phase WO of the present invention 3 Nanotubes are prepared by a one-step hydrothermal synthesis method, and the specific process is as follows:

[0025] (1) Weigh 3mmoL sodium tungstate dihydrate (Na 2 WO 4 2H 2 O), join in the beaker of 50 milliliters;

[0026] (2) Weigh 12mmoL oxalamine ((NH 4 ) 2 C 2 o 4 ) into the above-mentioned beaker, then add 20 milliliters of distilled water, and magnetically stir for 10 minutes;

[0027] (3) add 10 milliliters of concentration again and be the hydrochloric acid solution of 8mol / L, continue to stir for 40 minutes;

[0028] (4) Transfer the resulting reaction mixture to a 40 ml stainless steel reaction kettle with a polytetrafluoroethylene liner, seal it and place it in an oven, set the temperature at 200°C, and react for 24 hours;

[0029] (5) After the reaction is finished, cool naturally to room temperature, filter the precipitate, wash with absolute ethanol and distilled water for 3 to 5 times respective...

Embodiment 2

[0034] A hexagonal phase WO of the present invention 3 Nanotubes are prepared by a one-step hydrothermal synthesis method, and the specific process is as follows:

[0035](1) Weigh 3mmoL sodium tungstate dihydrate (Na 2 WO 4 2H 2 O), join in the beaker of 50 milliliters;

[0036] (2) Weigh 14mmoL oxalamine ((NH 4 ) 2 C 2 o 4 ) into the above-mentioned beaker, then add 20 milliliters of distilled water, and magnetically stir for 15 minutes;

[0037] (3) adding 10 milliliters of concentration is the hydrochloric acid solution of 8mol / L again, continue to stir for 35 minutes;

[0038] (4) Transfer the resulting reaction mixture to a 40 ml stainless steel reaction kettle with a polytetrafluoroethylene liner, seal it and place it in an oven, set the temperature at 195°C, and react for 28 hours;

[0039] (5) After the reaction is finished, cool naturally to room temperature, filter the precipitate, wash with absolute ethanol and distilled water for 3 to 5 times respectively...

Embodiment 3

[0042] A hexagonal phase WO of the present invention 3 Nanotubes are prepared by a one-step hydrothermal synthesis method, and the specific process is as follows:

[0043] (1) Weigh 3mmoL sodium tungstate dihydrate (Na 2 WO 4 2H 2 O), join in the beaker of 50 milliliters;

[0044] (2) Weigh 12mmoL oxalamine ((NH 4 ) 2 C 2 o 4 ) into the above-mentioned beaker, then add 20 milliliters of distilled water, and magnetically stir for 10 minutes;

[0045] (3) adding 10 milliliters of concentration is the hydrochloric acid solution of 8mol / L again, continue to stir for 50 minutes;

[0046] (4) Transfer the resulting reaction mixture to a 40 ml stainless steel reaction kettle with a polytetrafluoroethylene liner, seal it and place it in an oven, set the temperature at 205°C, and react for 24 hours;

[0047] (5) After the reaction is finished, cool naturally to room temperature, filter the precipitate, wash with absolute ethanol and distilled water for 3 to 5 times respectivel...

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Abstract

The invention discloses a hexagonal phase WO 3 Nanotubes and methods of making the same. Weigh 3 mmol of sodium tungstate dihydrate (Na 2 WO 4 ·2H 2 O) into a 50 ml beaker; add an appropriate amount of oxalic amine ((NH) 4 ) 2 C 2 O 4 ) and 20 milliliters of distilled water, magnetically stirred for 10-15 minutes; then add 10 milliliters of hydrochloric acid with a concentration of 8 mol / L, and continue stirring for 30-50 minutes; the reaction mixture is transferred to 40 milliliters of stainless steel reaction with a polytetrafluoroethylene lining In the kettle, set a certain temperature to react for 20-30 hours; naturally cool to room temperature to obtain the hexagonal phase WO of the present invention 3 nanotube. Hexagonal Phase WO 3 Nanotubes are produced in high yield, small in size and uniform in distribution. The outer diameter of the tube is between 8 and 12 nm, the thickness of the tube wall is between 2 and 4 nm, and the length is between 50 and 200 nm. The invention has the advantages of simple process, simple operation, good repeatability, green environmental protection and clean energy.

Description

technical field [0001] The invention relates to the technical field of preparation of nanomaterials, in particular to a hexagonal phase WO 3 Nanotubes and methods of making them. Background technique [0002] As an important n-type metal oxide, tungsten trioxide (WO 3 ) has a relatively narrow band gap of 2.5-2.8eV, and is widely used in electrochromic devices, photochromic devices, electronic devices, information displays, optical devices, sensors, smart windows, flat panel displays, field emitters and catalysis Wide range of applications. In recent years, it has also been found that tungsten trioxide-based sintered ceramics are expected to be used as varistor materials because of their certain nonlinear voltage-current characteristics. WO 3 It has a variety of crystal structures, mainly including four phases: orthorhombic phase, monoclinic phase, hexagonal phase and cubic phase. Among them, the hexagonal phase WO 3 It has a layered structure, and the WO of each layer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02B82Y30/00B82Y40/00
Inventor 胡寒梅徐俊婵
Owner ANHUI UNIVERSITY OF ARCHITECTURE