Method for preparing flower-shaped CuO microsphere and application of flower-shaped CuO microsphere in formaldehyde gas sensor

A sensor and microsphere technology, applied in the field of preparation of CuO microspheres, can solve problems such as large-scale application and expensive detection equipment, and achieve good response-recovery characteristics and selectivity, good crystallization, and good dispersion

Active Publication Date: 2017-07-25
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the common detection method for volatile organic compounds is an off-line detection method using solid-state extraction and gas chromatography combined analysis with reference to national standards, which has high technical requirements for operators, and the detection equipment is expensive and cannot be applied on a large scale

Method used

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  • Method for preparing flower-shaped CuO microsphere and application of flower-shaped CuO microsphere in formaldehyde gas sensor
  • Method for preparing flower-shaped CuO microsphere and application of flower-shaped CuO microsphere in formaldehyde gas sensor
  • Method for preparing flower-shaped CuO microsphere and application of flower-shaped CuO microsphere in formaldehyde gas sensor

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] (1) The preparation method of the flower-shaped CuO microspheres comprises the following steps:

[0024] Step 1: A certain amount of Cu(NO 3 ) 2 •3H 2 O, urea, and PEG20000 were dissolved in 80 mL of deionized water. Stir magnetically at room temperature for 30 minutes, and prepare a hydrothermal synthesis precursor reaction solution.

[0025] Step 2: Transfer the precursor reaction solution prepared in Step 1 into a polytetrafluoroethylene-lined stainless steel autoclave with a filling degree of 80% and seal it. Keep the temperature at 120-200°C for 12 hours, then cool down to room temperature with the furnace to obtain the reaction product.

[0026] Step 3: The reaction product obtained in Step 2 is centrifuged, washed repeatedly with distilled water and absolute ethanol, and then dried.

[0027] Step 4: Put the dried product in Step 3 into a muffle furnace and calcinate at 400° C. for 3 hours to obtain flower-shaped CuO microspheres.

[0028] (2) The steps of p...

Embodiment 1

[0034] (1) Preparation of flower-like CuO microspheres:

[0035] Step 1: 0.483 g Cu(NO 3 ) 2 ·3H 2 O, 0.36 g of urea, and 1.784 g of PEG20000 were dissolved in 80 mL of deionized water, and magnetically stirred at room temperature for 30 minutes to prepare a reaction solution of the precursor for hydrothermal synthesis.

[0036] Step 2: Transfer the precursor reaction solution prepared in Step 1 into a polytetrafluoroethylene-lined stainless steel autoclave with a filling degree of 80%, and seal it.

[0037] Step 3: Put the reaction kettle in Step 2 in an oven, keep it warm at 180° C. for 12 hours, and then cool it down.

[0038] Step 4: Centrifuge the reactant solution prepared in Step 3 to obtain a black precipitate, which is then repeatedly washed with distilled water and absolute ethanol.

[0039] Step 5: Place the product of Step 4 in a drying oven at a constant temperature at 80° C. for 24 hours for drying.

[0040] Step 6: Put the dried product in step 5 into a cle...

Embodiment 2

[0045] (1) Preparation of flower-like CuO microspheres:

[0046] Step one, two are with embodiment 1.

[0047] Step 3: Place the reaction kettle in Step 2 in an oven, keep it warm at 120° C. for 12 hours, and then cool it down.

[0048] Steps 4, 5 and 6 are the same as in Example 1.

[0049] (2) Structural characterization of flower-like CuO microspheres

[0050] The morphology of the product was characterized by scanning electron microscopy. Such as image 3 As shown in (a), the product is a bulk material composed of nanoblocks.

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Abstract

The invention discloses a method for preparing a flower-shaped CuO microsphere and application of the flower-shaped CuO microsphere in a formaldehyde gas sensor, and relates preparation of the flower-shaped CuO microsphere and application of the flower-shaped CuO microsphere in a gas sensor, Cu (NO3) 2 . 3H2O is used as a copper source, urea and PEG20000 are used as auxiliary agents, and the flower-shaped CuO microsphere assembled by nano strips can be obtained by hydrothermal reaction. The preparation method has the advantages that the whole production process is simple and practical, the product purity is high, and the cost is low, and the method is suitable for large-scale industrial production. The flower-shaped CuO microsphere prepared by the method has an unique spatial structure, increases the specific surface area of materials, also can be used to form a developed hierarchical pore channel, and facilitates rapid adsorption and desorption of formaldehyde gas molecules, so that the sensor shows high sensitivity, good selectivity and response-recovery characteristics, and has wide application prospects in the manufacture of the gas sensor.

Description

technical field [0001] The invention relates to a method for preparing CuO microspheres and its application in gas sensors, in particular to a method for preparing flower-shaped CuO microspheres and its application in formaldehyde gas sensors. Background technique [0002] Copper oxide (CuO) is a typical P-type narrow-band semiconductor material with a forbidden band width of 1.2eV. Because CuO has unique electrical, magnetic, and catalytic properties, it can be used as a multifunctional inorganic material with a wide range of uses: it has a wide range of applications in the fields of gas sensing, magnetic phase conversion, superconductivity, and catalysis. With the development of nanomaterial science and technology becoming more and more mature, nanotechnology has been applied to the preparation of CuO nanomaterials with better performance. Compared with conventional size CuO, nanoscale CuO material exhibits some unique properties, such as small size effect and quantum tun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/02G01N33/00
CPCC01G3/02C01P2002/72C01P2004/03C01P2004/32C01P2004/61G01N33/0047
Inventor 孟丹张硕彭耀嘉牛文雪
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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