Preparation of WO3 (tungsten trioxide) nanoflower material and application of WO3 nanoflower material in gas sensor
A nanomaterial, nanoflower technology, applied in nanotechnology, nanotechnology, analytical materials, etc., can solve problems such as high price, and achieve the effects of good reversibility, good reversibility and selectivity, and high porosity
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[0036] Example 1
[0037] The present invention is a WO made of self-assembled nano-sheets synthesized from scheelite concentrate 3 Nanoflower method and its application in NO 2 Application of gas sensor. The X-ray diffraction pattern of the scheelite concentrate used in the present invention is as follows figure 1 As shown, the results show that the main useful mineral in the scheelite concentrate is CaWO 4 .
[0038] One kind of gas-sensitive coating is WO made by self-assembly of nanosheets 3 The structure diagram of the nanoflower gas sensor is as figure 2 As shown, where Ni-Cr heating wire 2 crosses Al 2 O 3 The ceramic tube 1 is welded on the heating electrode of the hexagonal base, and the gold electrode 3 is coated with Al 2 O 3 The outer surface of the ceramic tube 1 is welded to the measuring electrode of the hexagonal base through 4 platinum wires 4, and the gas-sensitive coating 5 is coated on the outer surface of the gold electrode 3 and the ceramic tube 1. The compos...
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[0054] Example 2
[0055] One kind of gas-sensitive coating is WO made by self-assembly of nanosheets 3 The structure diagram of the nanoflower gas sensor is as figure 2 Shown.
[0056] A WO made of self-assembled nano-sheets synthesized from scheelite concentrate 3 Nano flower preparation method and NO 2 Gas sensor, follow the steps below:
[0057] ①Using sodium hydroxide leaching process to extract tungsten from scheelite concentrate: place the scheelite concentrate in a NaOH solution with a concentration of 15mol / L, at a liquid-solid ratio of 2:1, reaction temperature 170℃, stirring speed 600rpm , Leaching under the experimental conditions with a holding time of 180min, filtering the obtained leaching product to obtain filtrate and leaching residue, washing the leaching residue with deionized water three times to obtain a washing solution, mixing the obtained filtrate and the obtained washing solution to contain tungsten A leaching solution of acid radical ions, where the concen...
Example Embodiment
[0064] Example 3
[0065] One kind of gas-sensitive coating is WO made by self-assembly of nanosheets 3 The structure diagram of the nanoflower gas sensor is as figure 2 Shown.
[0066] A WO made of self-assembled nano-sheets synthesized from scheelite concentrate 3 Nano flower preparation method and NO 2 Gas sensor, follow the steps below:
[0067] ①Using sodium hydroxide leaching process to extract tungsten from scheelite concentrate: place the scheelite concentrate in a NaOH solution with a concentration of 18mol / L, at a liquid-solid ratio of 3:1, reaction temperature 190℃, stirring speed 700rpm , Leaching under the experimental conditions of holding time 30min, filtering the obtained leaching product to obtain filtrate and leaching residue, washing the leaching residue with deionized water 3 times to obtain washing liquid, mixing the obtained filtrate and the obtained washing liquid to contain tungsten The leaching solution of acid radical ions, the concentration of W in the le...
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