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A composite material with platinum single atoms dispersed on its surface, its preparation method, and gas-sensitive material

A composite material, atomic technology, applied in the field of chemical sensing materials, can solve problems such as the response of difficult-to-trace characteristic molecules

Active Publication Date: 2020-10-27
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limit of detection, it is currently difficult to respond to trace amounts of characteristic molecules.

Method used

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  • A composite material with platinum single atoms dispersed on its surface, its preparation method, and gas-sensitive material
  • A composite material with platinum single atoms dispersed on its surface, its preparation method, and gas-sensitive material
  • A composite material with platinum single atoms dispersed on its surface, its preparation method, and gas-sensitive material

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preparation example Construction

[0071] The present invention also provides a kind of preparation method of the composite material that is compounded with single atom, comprises the following steps:

[0072] A) After mixing the tungsten source solution and the acid, then washing with water to obtain a gel-like intermediate;

[0073] B) aging the gel-like intermediate, water and intercalation agent obtained in the above steps, and then after post-treatment and annealing treatment, to obtain tungsten oxide nanomaterials;

[0074] C) under the condition of hydrogen or hydrogen gas mixture, heat-treat the tungsten oxide nanomaterial obtained in the above steps to obtain a tungsten oxide nanomaterial with defects on the surface;

[0075] D) The tungsten oxide nanomaterials with defects on the surface obtained in the above steps are mixed again with the single atom source solution, after another post-treatment, and then reduced under the condition of hydrogen or hydrogen gas mixture, the composite compound with sin...

Embodiment 1

[0115] Preparation of Tungsten Oxide Ultrathin Nanosheets:

[0116] (1) Configure a 0.2mol / L sodium tungstate aqueous solution, add an appropriate amount of concentrated hydrochloric acid (37%) to acidify, and stir for a period of time to obtain a yellow tungstic acid sol; wherein, the molar ratio of sodium tungstate to acid is 1: 10.

[0117] (2) Centrifuge and wash the obtained tungstic acid sol with water for 3 to 5 times, and re-disperse with water; wherein, the mass ratio of water to sodium tungstate is 15:1.

[0118] (3) Add oxalic acid to the obtained tungstic acid sol, put it in an oven at 60°C, and age it for 24 hours for setting, then centrifuge and wash it for 3 to 5 times, and put it in a vacuum drying oven for 12 hours to dehydrate to obtain ultra-thin tungstic acid nanosheets ; Among them, the mass ratio of oxalic acid to sodium tungstate is 0.3:1.

[0119] (4) Put tungsten acid nanosheets into a porcelain boat, and anneal at 300° C. for 24 hours to obtain ultrat...

Embodiment 2

[0144] Preparation of Tungsten Oxide Ultrathin Nanosheets:

[0145] (1) Configure a 0.2mol / L sodium tungstate aqueous solution, add an appropriate amount of concentrated hydrochloric acid (37%) to acidify, and stir for a period of time to obtain a yellow tungstic acid sol; wherein, the molar ratio of sodium tungstate to acid is 1: 8.

[0146] (2) Centrifuge and wash the obtained tungstic acid sol with water for 3 to 5 times, and re-disperse with water; wherein, the mass ratio of water to sodium tungstate is 10:1.

[0147] (3) Add oxalic acid to the obtained tungstic acid sol, put it in an oven at 60°C, and age it for 20 hours for setting, then centrifuge and wash it for 3 to 5 times, and put it in a vacuum drying oven for 12 hours to dehydrate to obtain ultra-thin tungstic acid nanosheets ; Among them, the mass ratio of oxalic acid to sodium tungstate is 0.2:1.

[0148] (4) Put tungsten acid nanosheets into a porcelain boat, and anneal at 300° C. for 12 hours to obtain ultra...

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Abstract

The invention provides a composite material compounded with single atoms, the composite material comprises a tungsten oxide material with surface defects and the single atoms compounded on the surfaceof the tungsten oxide material. According to the invention, platinum single atoms are fixed on a tungsten oxide substrate material with manufacturing defects, so that excellent sensitivity and selectivity are brought, and the detection lower limit can reach ppb level. The composite material compounded with the single atoms shows superior response performance and selectivity in acetone gas detection, and has the advantages of fast response speed, high sensitivity, good thermal stability, simple and easy preparation method, high yield and low price. The composite material compounded with the single atoms is used for gas sensing detection for the first time, and the synthesis method may provide a new direction and strategy for chemical sensors and can promote the development of single atom gas sensing direction.

Description

[0001] This application claims the priority of the Chinese patent application submitted to the China Patent Office on February 27, 2018, the application number is 201810161263.9, and the title of the invention is "a composite material with platinum single atoms dispersed on the surface and its preparation method, and gas-sensitive material". rights, the entire contents of which are incorporated in this application by reference. technical field [0002] The invention belongs to the technical field of chemical sensing materials, and relates to a composite material compounded with single atoms and a preparation method thereof, and a gas-sensitive material, in particular to a composite material with platinum single atoms dispersed on the surface thereof, a preparation method thereof, and a gas-sensitive material . Background technique [0003] With the development of modern industry and the advancement of science and technology, serious ecological environment pollution, especial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02B82Y40/00B82Y30/00G01N33/00
CPCB82Y30/00B82Y40/00C01G41/02C01P2004/03C01P2004/20G01N33/00
Inventor 袁同伟吴宇恩
Owner UNIV OF SCI & TECH OF CHINA