Method for synthesizing superfine tungsten trioxide all nanorods by use of hydrothermal process

A technology of tungsten trioxide and hydrothermal method, which is applied in the direction of tungsten oxide/tungsten hydroxide, nanotechnology, nanotechnology, etc., can solve the problems of uneven distribution and large diameter of nanorods, and achieve the effect of uniform distribution and small diameter

Inactive Publication Date: 2014-07-23
CHANGAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the deficiencies in the prior art, the object of the present invention is to provide a method for preparing ultrafine tungsten trioxide full nanorods by ...

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  • Method for synthesizing superfine tungsten trioxide all nanorods by use of hydrothermal process
  • Method for synthesizing superfine tungsten trioxide all nanorods by use of hydrothermal process
  • Method for synthesizing superfine tungsten trioxide all nanorods by use of hydrothermal process

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Embodiment 1

[0053] Weigh 9.44g (0.0031mol) of ammonium metatungstate, add 200ml of deionized water to make a solution. Then weigh 15.76g (0.075mol) of citric acid and 25.86g (0.187mol) of sodium sulfate respectively, add them to the above ammonium metatungstate solution, and stir until they are completely dissolved. Keep the molar ratio of the raw materials W element: citric acid: SO 4 2- =1:2:5. Then add hydrochloric acid to adjust the pH value to 1.5, and then place it in a stainless steel reaction kettle with a polytetrafluoroethylene substrate, and react at 180° C. for 24 hours. After taking it out, perform centrifugal cleaning with water and acetone, and finally dry to obtain tungsten trioxide nanopowder. Such as Figure 1 to Figure 4 As shown, analyzed by FESEM, TEM, HRTEM, XRD and other analysis methods, the prepared nanopowder is tungsten trioxide nanorod with a diameter of about 50 nanometers and an average length of 1.5 microns. The ratio of diameter to length is about 1:30...

Embodiment 2

[0055] Weigh 9.44g (0.0031mol) of ammonium metatungstate, add 200ml of deionized water to make a solution. Then weigh 13.4g (0.638mol) of citric acid and 25.86g (0.187mol) of sodium sulfate respectively, add them to the above ammonium metatungstate solution, and stir until they are completely dissolved. Keep the molar ratio of the raw materials W element: citric acid: SO 4 2 - =1:1.7:5. Then add hydrochloric acid to adjust the pH value to 1.2, and then place it in a stainless steel reaction kettle with a polytetrafluoroethylene substrate, and react at 180° C. for 24 hours. After taking it out, perform centrifugal cleaning with water and acetone, and finally dry to obtain tungsten trioxide nanopowder. Such as Figure 6 As shown, the prepared nanopowder is a tungsten trioxide nanorod with a diameter of about 50 nanometers and an average length of 1.5 micrometers. The diameter to length ratio is about 1:30. XRD analysis test results such as Figure 5 Shown, same as embodi...

Embodiment 3

[0057] Weigh 9.44g (0.0031mol) of ammonium metatungstate, add 200ml of deionized water to make a solution. Then weigh 16.55g (0.0783mol) of citric acid and 25.86g (0.187mol) of sodium sulfate respectively, add them to the above ammonium metatungstate solution, and stir until they are completely dissolved. Keep the molar ratio of the raw materials W element: citric acid: SO 4 2- =1:2.1:5. Then add hydrochloric acid to adjust the pH value to 1.8, and then place it in a stainless steel reaction kettle with a polytetrafluoroethylene substrate, and react at 180° C. for 24 hours. After taking it out, perform centrifugal cleaning with water and acetone, and finally dry to obtain tungsten trioxide nanopowder. Such as Figure 7 As shown, the prepared nanopowder is a tungsten trioxide nanorod with a diameter of about 50 nanometers and an average length of 1.5 micrometers. The diameter to length ratio is about 1:30. XRD analysis test results such as Figure 5 Shown, same as embodi...

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Abstract

The invention provides a method for synthesizing superfine tungsten trioxide all nanorods by use of a hydrothermal process. The method is used for preparing the superfine tungsten trioxide nanorods by taking ammonium metatungstate as a tungsten source, and citric acid and sodium sulfate in a specific ratio as composite catalysts, and by adjusting the pH value with hydrochloric acid and ammonium hydroxide, and finally, the superfine tungsten trioxide nanorods are analyzed by FESEM (Field Emission Scanning Electron Microscope), XRD (X-Ray Diffraction), TEM (Transmission Electron Microscopy) and HRTEM (High Resolution Transmission Electron Microscopy) analysis methods; an XRD analysis test result indicates that the prepared tungsten trioxide is in hexagonal crystal form WO3, the JCPDS (Joint Committee On Powder Diffraction Standards) card of the prepared tungsten trioxide is #33-1387, the diameter of the tungsten trioxide is about 30-60 nanometers and the maximum length of the tungsten trioxide is 2.5 microns. The maximum diameter-to-length ratio of the tungsten trioxide is 1:80. The superfine tungsten trioxide full nanorods prepared by the method are high-purity hexagonal crystal tungsten trioxide, the diameter of the nanorods is small and the distribution of rod shapes is even, and all superfine tungsten trioxide nanorods are present without particles in other forms.

Description

technical field [0001] The invention belongs to the field of semiconductor materials and relates to tungsten trioxide, in particular to a method for synthesizing ultrafine tungsten trioxide full nanorods by a hydrothermal method. Background technique [0002] The traditional tungsten trioxide is mostly spherical, which is mainly used for semiconductor materials and tungsten sources for the preparation of tungsten composite materials. The preparation of spherical powders is mostly prepared by the sol-gel method, which is characterized in that the method is simple, and the prepared powders are Nano powder, easy to add other oxides to prepare composite powder. [0003] Compared with traditional materials, one-dimensional semiconductor nanomaterials (such as nanowires, nanorods, and nanotubes) have potential advantages in the fields of optics and point science due to their large specific surface area, high diameter-to-length ratio, and small size effect. . Assembling one-dimen...

Claims

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Application Information

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IPC IPC(8): C01G41/02B82Y30/00B82Y40/00
Inventor 王新刚张怀龙刘丽丽李文静时斌
Owner CHANGAN UNIV
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