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Preparation method of composite hollow microspheres with improved triethylamine detection performance

A technology of hollow microspheres and triethylamine, which is applied in the preparation of microspheres, microcapsule preparations, measuring devices, etc., to achieve the effects of high sensitivity, low cost, and wide-concentration linear response

Active Publication Date: 2019-04-16
QINGDAO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no W for improving the detection performance of triethylamine. 18 o 49 / Co 3 o 4 Related reports on the preparation process and application of composite hollow microspheres

Method used

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  • Preparation method of composite hollow microspheres with improved triethylamine detection performance
  • Preparation method of composite hollow microspheres with improved triethylamine detection performance
  • Preparation method of composite hollow microspheres with improved triethylamine detection performance

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Embodiment 1

[0027] In this embodiment, 0.2g W 18 O 49 The hollow microsphere powder sample was dispersed in 20mL Co(NO 3 ) 2 In the ethanol solution, put it in an oven to volatilize the ethanol to obtain a powder sample, which is calcined and dried for 2 hours in an air atmosphere at 300°C to obtain W 18 O 49 / Co 3 O 4 Composite hollow microspheres.

[0028] W 18 O 49 / Co 3 O 4 TEM characterization of composite hollow microspheres, the results are as follows Figure 5 As shown, the sample has a hollow structure, the spherical shell has a typical layered structure, the diameter of the microspheres is 400-600 microns, but the tube wall is relatively thick; the HRTEM characterization results show that Image 6 As shown, the spherical shell has a highly crystalline structure, and the lattice fringes correspond to W 18 O 49 (010) and Co 3 O 4 The (220) crystal plane; the gas sensitivity test on it, the result is as Figure 7 As shown, the sample has better response-recovery characteristics to 0.1-5...

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Abstract

The invention belongs to the technical field of semiconductor metal oxide gas sensors, and relates to a preparation method of composite hollow microspheres with improved triethylamine detection performance. The preparation method comprises: preparing a W18O49 hollow microsphere structure by using tungsten hexachloride and acetic acid as reaction raw materials and using ethanol as a solvent througha hydrothermal synthesis technology, placing the W18O49 hollow microspheres in a Co(NO3)2 ethanol solution, stirring until the solvent is completely evaporated, collecting the powdery material, and calcining to obtain the W18O49 / Co3O4 composite hollow microspheres. According to the present invention, the prepared W18O49 / Co3O4 composite hollow microspheres have the porous layered sphere shell, andhave the large specific surface area so as to provide more active sites for surface gas sensing reactions and increase the diffusion and transport of gas molecules inside the material; the surface ofthe obtained W18O49 / Co3O4 composite hollow microspheres contains a large amount of Co3O4 nanoparticles to construct a large number of p-n heterogeneous interfaces, such that the enhancement of the gas-sensitive response of triethylamine is promoted; and the obtained W18O49 / Co3O4 composite hollow microspheres have advantages of low cost, small size, flexibility and portable property, and are suitable for the actual detection of triethylamine.

Description

Technical field: [0001] The invention belongs to the technical field of semiconductor metal oxide gas sensors, and relates to a method for preparing composite hollow microspheres for improving the detection performance of triethylamine, in particular to a W 18 O 49 / Co 3 O 4 Preparation method of composite hollow microspheres. Background technique: [0002] As an important chemical raw material, triethylamine is widely used in medicine, pesticide, high-energy fuel and other industries. Triethylamine is a toxic, flammable, and corrosive volatile compound. Inhalation of triethylamine vapor can cause serious health hazards, such as skin corrosion, decreased vision, respiratory system, blood circulation system, and central nervous system. The nervous system, liver and other mucosal tissues are malfunctioning. The European Union stipulates that in working environments where the air contains triethylamine, the allowable exposure concentration is 1 ppm. Therefore, a detection techniqu...

Claims

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Application Information

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IPC IPC(8): B01J13/04G01N27/12
CPCB01J13/043G01N27/127
Inventor 张军刘相红徐永善郭向欣
Owner QINGDAO UNIV
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