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Method for rapidly preparing Au-TiO2 composite structure under acidic condition

A technology with acidic conditions and composite structures, applied in metal processing equipment, titanium oxide/hydroxide, nanotechnology for materials and surface science, etc., can solve the problem of easy aggregation of gold nanoparticles, poor repeatability, cumbersome experimental steps, etc. problems, to achieve broad-spectrum absorption performance, fast response, and easy operation

Inactive Publication Date: 2020-12-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the experimental steps of this method are cumbersome and the repeatability is poor, and in the subsequent heat treatment process, the agglomeration of gold nanoparticles is quite serious, resulting in a greatly reduced light absorption performance of the composite structure.
In an acidic environment, gold nanoparticles are easily aggregated, which will also lead to a decrease in the optical properties of the composite structure.
Therefore, the preparation of Au-TiO under acidic conditions 2 Methods for composite structures are rarely reported

Method used

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  • Method for rapidly preparing Au-TiO2 composite structure under acidic condition
  • Method for rapidly preparing Au-TiO2 composite structure under acidic condition
  • Method for rapidly preparing Au-TiO2 composite structure under acidic condition

Examples

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Effect test

Embodiment 1

[0025] Step 1: Weigh 0.5g TiO 2 And disperse it in deionized water, then add a certain amount of hydrochloric acid to make its molar concentration 23.94mmol / L, stir evenly with magnetic force, and set aside;

[0026] Step 2: Measure 1 mL of 10 mg / mL chloroauric acid solution and add 7 mL of deionized water to dilute. Then add 10 mg of polyvinylpyrrolidone (PVP), stir evenly, quickly inject 2 mL of sodium borohydride solution, so that the concentration of polyvinylpyrrolidone is 1 mg / mL, and the concentration of sodium borohydride is 0.45 mg / mL, continue to stir for 10 min, and set aside;

[0027] Step 3: Measure 5mL of the nano-gold solution prepared in step 2, and slowly add it dropwise to the solution in step 1 at a rate of 1 drop per second, stir rapidly at a stirring speed of 2600r / min for 10min, and centrifuge the product for 3 times, Finally, dry at 60°C.

Embodiment 2

[0029] Step 1: Weigh 0.5g TiO 2 And disperse it in deionized water, then add a certain amount of hydrochloric acid to make its molar concentration 23.94mmol / L, stir evenly with magnetic force, and set aside;

[0030] Step 2: Measure 1 mL of 10 mg / mL chloroauric acid solution and add 7 mL of deionized water to dilute. Then add 10 mg of polyvinylpyrrolidone (PVP), stir evenly, quickly inject 2 mL of sodium borohydride solution, so that the concentration of polyvinylpyrrolidone is 1 mg / mL, and the concentration of sodium borohydride is 0.45 mg / mL, continue to stir for 10 min, and set aside;

[0031] Step 3: Measure 10mL of the nano-gold solution prepared in step 2, and slowly add it dropwise to the solution in step 1 at a rate of 1 drop per second, stir rapidly at a stirring speed of 2600r / min for 10min, and centrifuge the product for 3 times, Finally, dry at 60°C.

Embodiment 3

[0033] Step 1: Weigh 0.5g TiO 2 And disperse it in deionized water, then add a certain amount of hydrochloric acid to make its molar concentration 23.94mmol / L, stir evenly with magnetic force, and set aside;

[0034] Step 2: Measure 1 mL of 10 mg / mL chloroauric acid solution and add 7 mL of deionized water to dilute. Then add 10 mg of polyvinylpyrrolidone (PVP), stir evenly, quickly inject 2 mL of sodium borohydride solution, so that the concentration of polyvinylpyrrolidone is 1 mg / mL, and the concentration of sodium borohydride is 0.45 mg / mL, continue to stir for 10 min, and set aside;

[0035] Step 3: Measure 15mL of the nano-gold solution prepared in step 2, and slowly add it dropwise to the solution in step 1 at a rate of 1 drop per second, stir rapidly at a stirring speed of 2600r / min for 10min, and centrifuge the product for 3 times, Finally, dry at 60°C.

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Abstract

The invention discloses a method for rapidly preparing an Au-TiO2 composite structure under an acidic condition. The method comprises the following steps: firstly, adding hydrochloric acid to adjust aTiO2 aqueous solution to be acidic; then, preparing nano gold particles which can stably exist under the acidic condition by taking sodium borohydride as a reducing agent and PVP as a protective agent; and finally, slowly dropwise adding a nano gold solution into the acidic TiO2 solution, quickly stirring, and centrifugally washing and drying to prepare the Au-TiO2 composite structure. The preparation method provided by the invention is simple to operate and high in reaction speed; and in the prepared Au-TiO2 composite structure, the nano gold particles are uniformly distributed on the surface of TiO 2. In addition, the composite structure also has wide-spectrum absorption performance covering ultraviolet and visible light regions.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a method for rapidly preparing Au-TiO under acidic conditions 2 Composite structure method. Background technique [0002] TiO 2 Because of its good physical and chemical stability, high catalytic efficiency and low cost, it has broad application prospects in solar cells, photocatalysis, and other photoelectric, photovoltaic, and photochemical fields. However, TiO 2 The nature of their own wide-bandgap semiconductors allows them to absorb only ultraviolet light in the solar spectrum. At the same time, its high electron-hole recombination rate makes it difficult for photogenerated carriers to be separated efficiently. These two points limit the TiO 2 Large-scale applications in the fields of photocatalysis and photoelectric conversion. [0003] Loading noble metal nanoparticles (Au, Ag, etc.) onto TiO 2 surface, not only can make TiO 2 The absorption range extends to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B22F1/02C01G23/047B82Y20/00B82Y30/00B82Y40/00
CPCB22F9/24C01G23/08B82Y30/00B82Y40/00B82Y20/00B22F1/16B22F1/054
Inventor 鲁颖炜杨浩邓小波
Owner HEFEI UNIV OF TECH
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