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Gold-doped titanium dioxide flower-like nanostructured material and preparation method and application thereof

A technology of titanium dioxide and nanostructures, applied in nanotechnology, nanotechnology, analytical materials, etc., to achieve the effects of lower working temperature requirements, low production costs, and high sensitivity

Inactive Publication Date: 2016-12-14
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Noble metals such as Pt, Pd, Au etc. doped TiO reported in existing literature 2 Nanoparticles or nanofibers can improve a certain performance index, such as increasing sensitivity, but fail to significantly improve other properties at the same time, such as operating temperature, response recovery time, etc.

Method used

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  • Gold-doped titanium dioxide flower-like nanostructured material and preparation method and application thereof
  • Gold-doped titanium dioxide flower-like nanostructured material and preparation method and application thereof
  • Gold-doped titanium dioxide flower-like nanostructured material and preparation method and application thereof

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Effect test

Embodiment 1

[0041] The preparation of gold-doped titanium dioxide flower-like nanomaterials specifically includes the following steps:

[0042]1) Mix 4.5mL 0.01mol / L chloroauric acid solution with 4.5mL 0.01mol / L trisodium citrate solution, and stir vigorously at room temperature for 2min. Add 5mL of 0.01mol / L ascorbic acid dropwise to the resulting solution, and stir while dripping, until the color of the solution gradually changes to lavender and then rapidly turns reddish brown, and continues to stir for 5 minutes at room temperature. Finally, 6 mL of 0.04 mol / L titanium tetrafluoride solution was added and stirred evenly to obtain a mixed solution.

[0043] 2) The mixed solution obtained in step 1) was diluted to 90 mL with deionized water, placed in a hydrothermal reaction kettle, and subjected to a hydrothermal reaction at 180° C. for 48 hours to obtain a precipitate and a mother liquor. After the reactor was naturally cooled, the precipitate was washed with deionized water and abs...

Embodiment 2

[0046] The preparation of gold-doped titanium dioxide flower-like nanomaterials specifically includes the following steps:

[0047] 1) Mix 0.3mL 0.01mol / L chloroauric acid solution with 4.5mL 0.01mol / L trisodium citrate solution, and stir vigorously at room temperature for 2min. Add 0.6 mL of 0.01 mol / L ascorbic acid dropwise to the resulting solution, and stir while dripping. When the color of the solution gradually changes from lavender to reddish brown, continue stirring at room temperature for 5 minutes. Finally, 6 mL of 0.04 mol / L titanium tetrafluoride solution was added and stirred evenly to obtain a mixed solution.

[0048] 2) The mixed solution obtained in step 1) was diluted to 90 mL with deionized water, placed in a hydrothermal reaction kettle, and subjected to a hydrothermal reaction at 180° C. for 48 hours to obtain a precipitate and a mother liquor. After the reactor was naturally cooled, the precipitate was washed with deionized water and absolute ethanol resp...

Embodiment 3

[0050] The preparation of gold-doped titanium dioxide flower-like nanomaterials specifically includes the following steps:

[0051] 1) Mix 1.2mL 0.01mol / L chloroauric acid solution with 4.5mL 0.01mol / L trisodium citrate solution, and stir vigorously at room temperature for 2min. Add 1.2 mL of 0.01 mol / L ascorbic acid dropwise to the obtained solution, and stir while dripping, until the color of the solution gradually changes to lavender and then rapidly turns reddish brown, and continues to stir at room temperature for 10 minutes. Finally, 4 mL of 0.04 mol / L titanium tetrafluoride solution was added and stirred evenly to obtain a mixed solution.

[0052] 2) The mixed solution obtained in step 1) was diluted to 90 mL with deionized water, placed in a hydrothermal reaction kettle, and subjected to a hydrothermal reaction at 180° C. for 36 hours to obtain a precipitate and a mother liquor. After the reactor was naturally cooled, the precipitate was washed with deionized water an...

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Abstract

The invention discloses a gold-doped titanium dioxide flower-like nanostructured material and a preparation method and an application thereof. In the nanostructured material, the average size of gold nanometer particle as a nucleus (pistil) is 20-50nm, and the average size of titanium dioxide nanoparticle as a casing (petal) is 50-100 nm. The preparation method comprises the steps of (1) mixing an auric chloride acid solution and a trisodium citrate solution, stirring, then adding a ascorbic acid solution and stirring, then adding a titanium tetrafluoride solution and stirring uniformly to obtain a mixed solution; (2) conducting high temperature hydrothermal reaction to the mixed solution obtained from step (1) for a period of time, and washing and drying a sediment obtained from the reaction to obtain a gold-doped titanium dioxide flower-like nanostructured material. The obtained material has the advantages that the size of the nanometer particles are uniform, and the disperse performance is good. The material is applied for preparing gas-sensitive elements, and has a high sensitivity and selectivity and short response recovery time to carbon monoxide.

Description

technical field [0001] The invention belongs to the technical field of nano-semiconductor sensing, and in particular relates to a gold-doped titanium dioxide flower-shaped nano-structure material and a preparation method and application thereof. Background technique [0002] Titanium dioxide (TiO 2 ) is an important wide-bandgap n-type semiconductor. As a unique functional material, it has been applied in many fields, such as photocatalysis, electrochemistry, biology, etc. Compared with other metal oxide semiconductor materials, TiO 2 It has the advantages of low cost, non-toxicity and high chemical stability. In recent years, nano-titanium dioxide has been used in the field of gas sensing, which has the advantages of high sensitivity, fast response recovery time, and good repeatability, so it has attracted extensive attention from researchers. [0003] However, the existing micron-scale pure TiO 2 As a sensitive material, there are shortcomings such as high optimal work...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24B82Y40/00B82Y30/00G01N27/00
CPCG01N27/00B82Y30/00B82Y40/00B22F9/24B22F1/0553B22F1/054
Inventor 王明玺刘海洋刘善堂肖丽周发武
Owner WUHAN INSTITUTE OF TECHNOLOGY
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