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Tungstic trioxide nano-slice and preparation method thereof

A technology of tungsten trioxide and nanosheets, which is applied in the field of nanotechnology and new materials, can solve the problems that the preparation method of two-dimensional tungsten oxide has not been reported, and achieve the effect of large production scale, high efficiency and high dispersion

Inactive Publication Date: 2008-12-10
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, the two-dimensional tungsten oxide (WO 3 ) nanosheet and its preparation method have not been reported

Method used

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  • Tungstic trioxide nano-slice and preparation method thereof
  • Tungstic trioxide nano-slice and preparation method thereof
  • Tungstic trioxide nano-slice and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 10g, about 20mmol of H 2 W 2 o 7 2.5H 2 O dispersed in 66 mL of CH 3 (CH 2 ) 7 NH 2 with 330 mL of CH 3 (CH 2 ) 5 CH 3 NH 2 In the mixed solution, react at room temperature at 22°C under continuous stirring for 72 hours; centrifuge to obtain a white solid product, which is washed twice with hexane and ethanol respectively; the washed solid product is dried under reduced pressure at room temperature for 5 hours to obtain a white solid intermediate product. The X-ray diffraction spectrum of the product is as figure 1 As shown in e, it has typical two-dimensional layered structure characteristics, and the layer spacing is 2.59nm; its representative morphology is as follows figure 2 As shown in c, it is a quasi-one-dimensional band structure; its Fourier infrared spectrum is as follows image 3 , indicating that the obtained product is a tungstic acid-based organic / inorganic hybrid. Thermogravimetric analysis indicated that the blend had an inorganic content...

Embodiment 2

[0039] About 2 grams of WO, dried at 120°C 3 ·H 2 O nanosheets into Al 2 o 3 Crucible (covered); then put the crucible in an ordinary electric furnace, heat treatment in air atmosphere at 350°C for 5h, and control the heating rate at 2°C min -1 , and finally naturally cooled to room temperature to obtain 1.9 g of product. Its X-ray diffraction spectrum is as Figure 9 , indicating that the obtained product is also monoclinic tungsten oxide (WO 3 ).

Embodiment 3

[0041] 2.37 g of WO, dried at 120°C 3 ·H 2 O nanosheets into Al 2 o 3 Crucible (covered); then put the crucible in an ordinary electric furnace, heat treatment in an air atmosphere at 250°C for 5h, and control the heating rate at 2°C min -1 , and finally naturally cooled to room temperature to obtain 2.22 g of product. The X-ray diffraction spectrum and transmission electron microscope analysis result of gained product are respectively as follows Figure 10 , Figure 11 , indicating that the obtained product is monoclinic tungsten oxide (WO 3 ) nanosheets, and a single nanosheet is a single crystal.

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Abstract

The invention relates to a tungsten trioxide (WO3) nano-plate and a preparation method thereof. The tungsten trioxide (WO3) nano-plate is characterized in that: the tungsten trioxide (WO3) nano-plate is monocrystal and monoclinic phase (JCPDS No.43-1035), and is shaggy and flocculent; the area is (100-800)nmx(100-800)nm; the apparent thickness is between 5 and 40 nanometers; and the BET specific surface area can reach 100-250 square meters per gram. The preparation method for the tungsten trioxide (WO3) nano-plate comprises the following steps that: a tungstenic acid organic or inorganic laminated mixed micron / nano belt (pipe) is taken as a precursor, and organic substances between precursor layers are removed through oxidation by a nitric acid, and then a tungstenic acid (WO3.H2O) nano-plate is prepared; the reaction temperature is between 15 and 50 DEG C, and the reaction time is between 5 and 120 hours; the tungstenic acid (WO3.H2O) nano-plate is heated up to between 250 and 600 DEG C at a heating rate of between 1 and 5 DEG C per minute, undergoes heat insulation for 1 to 5 hours, and finally naturally cooled to the room temperature so as to remove crystal water, and the tungsten trioxide nano-plate is prepared. The method has a simple technological process, a large variation range of operating parameters, strong adaptability, low facility requirement, controllable appearance of products, high repeatability, high efficiency and low cost.

Description

technical field [0001] The invention relates to a two-dimensional tungsten trioxide (WO) based on intercalation chemical technology 3 ) nanosheet, also relates to a kind of this tungsten trioxide (WO 3 ) The preparation method of the nanosheet belongs to the field of nanotechnology and new materials. Background technique [0002] In recent years, there have been a large number of literatures on the preparation of nanostructures (zero-dimensional quantum dots, one-dimensional nanowires or nanorods, nanoneedles, and two-dimensional nanosheets) such as oxides, sulfides, metal elements, nitrides, and carbides. reports. The preparation methods can be summarized as wet chemical method, high temperature gas phase method and mechanochemical method. For the first two methods, although the specific technical routes adopted are very different, the growth of nanocrystals generally uses atomic or molecular substances containing target elements as precursors, and the growth process can...

Claims

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Application Information

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IPC IPC(8): C01G41/02B82B3/00
Inventor 陈德良张锐王海龙卢红霞许红亮
Owner ZHENGZHOU UNIV
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