Unlock instant, AI-driven research and patent intelligence for your innovation.

Tungsten oxide nano-material and method for preparing same

A tungsten oxide nanowire, aluminum oxide film technology, applied in chemical instruments and methods, tungsten oxide/tungsten hydroxide, polycrystalline material growth and other directions, can solve the complex process of nanowire synthesis, difficult to mass production, increase energy consumption and other problems, to achieve the effects of easy control of process parameters, peculiar appearance, and low energy consumption

Inactive Publication Date: 2011-06-29
TSINGHUA UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method WO 3 The synthesis process of nanowires is very complicated and consumes a lot of energy. For example, the hydrothermal temperature in the early stage was as high as 200°C, and the hydrothermal time was as long as 24 hours.
Andrea Ponzoni et al. (AndreaPonzoni et al. Applied Physics Letters, 88: 203101-1-203101-3, 2006) prepared WO by evaporating tungsten powder at 1400-1450°C 3-X Nanowire network structure, the nanowire network structure is composed of nanowires with a diameter of tens of nanometers to 200nm, but parameters such as temperature, pressure, and evaporation time must be strictly controlled during the preparation process, and the entire reaction is carried out in a vacuum chamber. A certain flow rate of argon gas is introduced, and the preparation temperature is as high as 1400-1450 ° C, which greatly increases energy consumption and is difficult to achieve large-scale production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Tungsten oxide nano-material and method for preparing same
  • Tungsten oxide nano-material and method for preparing same
  • Tungsten oxide nano-material and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, the raw materials used to prepare the sol are superior pure anhydrous ethanol and WCl produced by ALDRICH with a purity of 99.9+%. 6 and a triblock copolymer P123 with a molecular weight (Mn) of 5800.

[0027] First, it is necessary to wax the figure 1 The anodized aluminum template shown in ( figure 2 The energy spectrum of the template) is fixed and sealed in a sand funnel, and then the gas inside the hole of the AAO template is discharged under a certain negative pressure, in order to make the filling process of the sol easier.

[0028] 1. Preparation of sol

[0029] Accurately weigh a certain amount of P123, WCl 6 And superior pure anhydrous ethanol, make P123, WCl 6 The weight ratio of P123 and superior grade pure absolute ethanol is 0.5:1:10. Dissolve the weighed P123 in the weighed superior grade pure absolute ethanol and carry out magnetic stirring until the P123 is completely dissolved. Weighed WCl 6 Slowly add to the above-mentioned P1...

Embodiment 2

[0040] 1. Accurately weigh a certain amount of P123 and WCl when preparing the sol 6 And superior pure anhydrous ethanol, make P123, WCl 6 The weight ratio with superior grade pure dehydrated alcohol is 0.55: 1.2: 14;

[0041] 2. Fill the sol just prepared in the above 1 into the AAO template that has been subjected to negative pressure treatment under the pressure of -0.2Mpa;

[0042] 3. Rinse the template filled with sol three times with absolute ethanol and deionized water, and then dry it in a vacuum oven at 65°C for 8 hours;

[0043] 4. The highest sintering temperature is 450°C, the heating rate is 100°C / hour, and the holding time at 450°C is 6 hours; the flow rate of high-purity argon is 0.3 cubic decimeters / minute, that is, the tungsten oxide nanowires are produced Materials, the prepared tungsten oxide nanowires such as Figure 6shown.

Embodiment 3

[0045] In this embodiment, the steps implemented are the same as in Embodiment 1, the difference is:

[0046] 1. Accurately weigh a certain amount of P123 and WCl when preparing the sol 6 And superior pure anhydrous ethanol, make P123, WCl 6 The weight ratio with superior grade pure dehydrated alcohol is 0.4: 0.8: 7;

[0047] 2. Fill the sol just prepared in the above 1 into the AAO template that has been subjected to negative pressure treatment under the pressure of -0.08Mpa;

[0048] 3. Rinse the template filled with the sol three times with absolute ethanol and deionized water, and then dry it in a vacuum oven at 55°C for 12 hours;

[0049] 4. The highest sintering temperature is 550°C, the heating rate is 100°C / hour, and the holding time at 550°C is 4 hours; the flow rate of high-purity argon gas is 0.4 cubic decimeters / minute, and the tungsten oxide nanowires are produced Material.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a tungsten oxide nanowire material with a diameter being 10-80 nanometer and a length being 200 nanometers to 5 microns; a chrysanthemum shaped nanowire is developed on AAO surface; the valency of the tungsten is +6. A triblock copolymer P123, WCl6 and a superior level pure absolute ethyl alcohol are confected into sol, according to a weight ratio of (0.4-0.55): (0.8-1.2):(7-14); under a pressure of -0.08- -0.2MPa, the sol is padded in an AAO template hole, rinsed and dried, and then sintered under an atmosphere of high purity argon of 0.3-0.4 cdm / min and the temperature of 450-550 DEG C for 4-6 hours, thus obtaining the tungsten oxide nanowire. The procedures of the preparation method of the invention are simple; the technical parameter in the process of the preparation is easy to control; the energy consumption in the whole preparation process is very low; the feature of the prepared tungsten oxide nanowire is peculiar; a big specific surface is possessed. Important application significance is possessed in fields like a gas sensor, etc.

Description

technical field [0001] The invention relates to a tungsten oxide nanowire material and a preparation method thereof, belonging to the technical field of preparation of one-dimensional nanometer oxide materials. Background technique [0002] Tungsten oxide is an n-type semiconductor, which is a typical transition metal oxide. As a functional material, [0003] In recent years, it has been found that tungsten-based oxides not only serve as catalysis, electrochromism, battery electrodes, solar energy absorbing materials and stealth materials, but also have the properties of heat-sensitive, pressure-sensitive and gas-sensitive semiconductor functional materials. Tungsten oxide nanocrystalline film The application and research in gas sensor, photocatalysis, photoconductivity, etc. are attracting more and more people's attention, especially in the application field of oxide semiconductor gas sensor, tungsten oxide-based materials have been considered to be the most effective way ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/16C30B29/62C01G41/02
Inventor 唐子龙徐宇兴张中太
Owner TSINGHUA UNIV