Dumbbell-shaped gold nano bipyramid/titanium dioxide nano composite material and preparation method thereof

A nanocomposite material, titanium dioxide technology, applied in the field of material chemistry, can solve the problems of narrow absorption wavelength range, low solar energy utilization, low quantum conversion efficiency and so on

Inactive Publication Date: 2018-10-26
HUANGHE S & T COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, titanium dioxide photocatalysts also have some shortcomings, such as a narrow range of light absorption wavelengths, most of which are in the ultraviolet region, and low utilization of solar energy; and the recombination rate of carriers is high, and the quantum conversion efficiency is low.

Method used

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  • Dumbbell-shaped gold nano bipyramid/titanium dioxide nano composite material and preparation method thereof
  • Dumbbell-shaped gold nano bipyramid/titanium dioxide nano composite material and preparation method thereof
  • Dumbbell-shaped gold nano bipyramid/titanium dioxide nano composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of a dumbbell-shaped gold nano-bicone / titanium dioxide nanocomposite material, comprising the steps of:

[0020] (1) Preparation of gold nano bicone seeds: Add 0.25mL 0.01mol / L trisodium citrate solution and 0.125mL 0.01mol / L chloroauric acid solution into 9.625mL ultrapure water in sequence, and mix well A mixed solution was obtained. Then add 0.15 mL of 0.01 mol / L sodium borohydride solution newly prepared into the mixed solution, stir rapidly, the solution turns from yellow to light red, and stand at room temperature for 2 hours to obtain the seed solution.

[0021] (2) Growth of gold nanobicones: 2mL 0.01mol / L chloroauric acid solution, 0.4mL 0.01mol / L silver nitrate solution, 0.8mL 1mol / L hydrochloric acid solution, 0.32mL 0.1mol / L ascorbic acid The solution was sequentially added to 40 mL of 0.1 mol / L cetyltrimethylammonium bromide solution, and mixed uniformly to obtain a growth solution. Then add the seed solution therein, stir for 10 seco...

Embodiment 2

[0028] A preparation method of a dumbbell-shaped gold nano-bicone / titanium dioxide nanocomposite material, comprising the steps of:

[0029] (1) Prepare gold nano-bicones by seed method (the method is the same as in Example 1), add 0.4mL seeds, and synthesize gold nano-bicones with a longitudinal plasmon resonance peak of 746nm; centrifuge the original solution of gold nano-bicones at 7000rpm for 10 minutes , remove the supernatant, and disperse the precipitate in 10mL ultrapure water to obtain a gold nano-bipyramid solution; mix 0.5mL gold bipyramid solution with 0.3 mM 1.5mL cetyltrimethylammonium bromide solution to obtain a mixed solution;

[0030] (2) Disperse 0.2 mL of titanium trichloride solution in 5 mL of ultrapure water, stir slowly, add 1.2 mL of 0.93 mol / L sodium bicarbonate solution dropwise to adjust the pH to 2.5, and obtain the hydrolysis of titanium trichloride liquid;

[0031](3) Add the mixed solution obtained in step (1) to the solution obtained in step ...

Embodiment 3

[0034] A preparation method of a dumbbell-shaped gold nano-bicone / titanium dioxide nanocomposite material, comprising the steps of:

[0035] (1) Prepare gold nano-bicones by seed method (the method is the same as in Example 1), add 0.4mL seeds, and synthesize gold nano-bicones with a longitudinal plasmon resonance peak of 746nm; centrifuge the original solution of gold nano-bicones at 7000rpm for 10 minutes , remove the supernatant, and disperse the precipitate in 10mL ultrapure water to obtain a gold nanobiconical solution; mix 0.5mL gold biconical solution with 0.8mM 1.5mL cetyltrimethylammonium bromide solution to obtain a mixed solution;

[0036] (2) Disperse 0.2mL of titanium trichloride solution in 4 mL of ultrapure water, stir slowly, add 1.2mL of 0.93 mol / L sodium bicarbonate solution dropwise to adjust the pH to 2.5, and obtain the hydrolysis of titanium trichloride liquid;

[0037] (3) Add the mixed solution obtained in step (1) to the solution obtained in step (2)...

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Abstract

The invention discloses a dumbbell-shaped gold nano bipyramid / titanium dioxide nano composite material and a preparation method thereof, which belongs to the field of material chemistry. By adopting awet chemical method, by virtue of TiCl3 hydrolysis, TiO2 is generated on two ends of gold nano bipyramid, and a dumbbell-shaped structure is obtained. The gold nano bipyramid is compounded with titanium dioxide, and an absorption spectrum of titanium dioxide is enlarged to a visible light and a near-infrared zones, so that the charge separation of metal thermal electrons can be maximally improved. Compared with a core-shell structure, by adopting the dumbbell-shaped space separation structure, the middle portion of the gold bipyramid is exposed, under the illumination of the visible light andthe near infrared light, the generated SPR thermalelectrons span a schottky barrier and are transferred onto titanium dioxide, so that the thermalelectrons can be effectively separated from the goldnano bipyramid, and the remaining positive charge can directly react with an electron donor on the surface of the gold bipyramid to have the oxidation reaction.By adopting the dumbbell-shaped nano composite material, the generation of the thermal electrons and the photocatalytic performance of the thermalelectrons can be effectively improved.

Description

technical field [0001] The invention belongs to the field of material chemistry. Specifically disclosed is a dumbbell-shaped gold nano bicone / titanium dioxide composite material and a preparation method thereof. The nanocomposite material has broad application prospects in the fields of photocatalysis, solar cells, photothermal therapy and the like. Background technique [0002] Gold nanocrystals have been widely used in solar energy harvesting, biotechnology, disease diagnosis and nanomedicine due to their unique physicochemical and plasmonic properties. Among gold nanocrystals, elongated gold nanocrystals like gold rods are widely used in various research fields due to their mature synthesis methods and tunable plasma wavelength. [0003] In addition to gold nanorods, gold nanobicones are another elongated gold nanocrystal with tunable longitudinal plasmon resonance wavelength (LSPR) (Adv. Funct. Mater. 2016, 26, 341). Gold nanobicones consist of two pentagonal prisms co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/02H01L31/04H01L31/02
CPCB01J23/52B01J35/02H01L31/02H01L31/04Y02E10/50
Inventor 何广莉张守仁杨保成殷航高凤丽
Owner HUANGHE S & T COLLEGE
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