Method for preparing zinc oxide nanorod-silver microdisk composite heterostructure

A zinc oxide nanorod, heterostructure technology, applied in chemical instruments and methods, single crystal growth, polycrystalline material growth and other directions, can solve the problem of narrow light absorption range, high charge recombination rate, unfavorable electron and hole acceptors Infiltration and adsorption problems, to achieve the effects of stable product properties, broadened absorption spectrum, and controllable preparation methods

Inactive Publication Date: 2015-11-25
TONGJI UNIV
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  • Abstract
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Problems solved by technology

[0003] Most of the noble metal-zinc oxide composite materials prepared at present are (a) the noble metal is deposited in situ on the surface of the semiconductor material or (b) dispersed in the semiconductor material, these simple composite structures will have some disadvantages
The first is that the composite material has a narrow range of light absorption: the previously reported noble metal-semiconductor composite materials respond to light mainly in the ultraviolet (<400nm) and part of the visible light region (500-700nm), and the response to infrared light is very limited. (700-2500nm), which will directly affect the ability of the material to utilize long-wavelength light; secondly, the charge transport capacity in the metal-semiconductor composite structure is low, and the charge recombination rate is high: as described in (a) and (b) above In this case, because the metal or semiconductor particles are isolated from each other, there is no effective way for photogenerated electrons and holes to be efficiently transported and released, and the dense structure of the composite material is not conducive to the penetration and adsorption of electrons and hole acceptors, resulting in Increased charge recombination opportunities and reduced catalytic activity

Method used

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  • Method for preparing zinc oxide nanorod-silver microdisk composite heterostructure
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  • Method for preparing zinc oxide nanorod-silver microdisk composite heterostructure

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Experimental program
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Effect test

Embodiment 1

[0028]Weigh 0.1 gram of dextran sodium sulfate (molecular weight 40,000) and dissolve it in the mixed solution of water and formamide, then mix 0.1 milliliter of ascorbic acid and 0.1 milliliter of silver nitrate with equimolar concentration (0.2 mol / liter) successively under stirring Add it into the mixed solution and let it stand at room temperature for 24 hours to prepare a silver microdisc product with holes. The product was centrifuged, washed with water, dried and soaked in 0.1 g / L polyvinylpyrrolidone (PVP, molecular weight 12000) aqueous solution for 4 hours, so that PVP was adsorbed on the silver plate. At the same time, another 125 milliliters of 10 mmol / L zinc acetate in ethanol was added dropwise to 65 mL of 30 mmol / L potassium hydroxide in ethanol, and the mixture was continuously stirred at 60° C. for 2 hours. A zinc oxide seed solution is prepared. Then the silver microdisk that PVP is processed is dispersed in the above-mentioned zinc oxide seed crystal soluti...

Embodiment 2

[0030] Weigh 0.1 gram of dextran sodium sulfate (molecular weight 40,000) and dissolve it in the mixed solution of water and formamide, then mix 0.1 milliliter of ascorbic acid and 0.1 milliliter of silver nitrate with equimolar concentration (0.2 mol / liter) successively under stirring Add it into the mixed solution and let it stand at room temperature for 24 hours to prepare a silver microdisc product with holes. The product was centrifuged, washed with water, dried and soaked in 0.1 g / L polyvinylpyrrolidone (PVP, molecular weight 12000) aqueous solution for 4 hours, so that PVP was adsorbed on the silver plate. At the same time, another 125 milliliters of 10 mmol / L zinc acetate in ethanol was added dropwise to 65 mL of 30 mmol / L potassium hydroxide in ethanol, and the mixture was continuously stirred at 60° C. for 2 hours. A zinc oxide seed solution is prepared. Then the PVP-treated silver microdiscs were dispersed into the above-mentioned zinc oxide seed crystal solution, ...

Embodiment 3

[0032] Weigh 0.1 gram of dextran sodium sulfate (molecular weight 40,000) and dissolve it in the mixed solution of water and formamide, then mix 0.1 milliliter of ascorbic acid and 0.1 milliliter of silver nitrate with equimolar concentration (0.2 mol / liter) successively under stirring Add it into the mixed solution and let it stand at room temperature for 24 hours to prepare a silver microdisc product with holes. The product was centrifuged, washed with water, dried and soaked in 0.1 g / L polyvinylpyrrolidone (PVP, molecular weight 12000) aqueous solution for 4 hours, so that PVP was adsorbed on the silver plate. At the same time, another 125 milliliters of 10 mmol / L zinc acetate in ethanol was added dropwise to 65 mL of 30 mmol / L potassium hydroxide in ethanol, and the mixture was continuously stirred at 60° C. for 2 hours. A zinc oxide seed solution is prepared. Then the PVP-treated silver microdiscs were dispersed into the above-mentioned zinc oxide seed crystal solution, ...

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Abstract

The invention relates to a method for preparing a composite heterostructure of zinc oxide nano rods and a silver micron plate. The method includes: utilizing dextran sulphate sodium as regulating agent to prepare a perforated silver micron plate in a reaction system of silver nitrate and an ascorbic acid solution of water and methanamide; depositing zinc oxide seed crystals on the silver micron plate, coating the silver micron plate with the deposition of the zinc oxide seed crystals on an electric-conducting glass sheet in a rotating manner, cleaning, drying, placing the electric-conducting glass sheet in an ethanol solution of hexamethylene tetramine and zinc nitrate to grow a zinc oxide nano rod array on the silver micron plate, fully cleaning with water, and naturally drying to obtain the finished product. The product prepared by the method is a high-level composite heterostructure with the zinc oxide nano rod array growing on the perforated silver micron plate, wherein the diameter of the silver micron plate is about 4 microns, and the size and the structure of the zinc oxide nano rod array are adjustable and controller. The method for preparing the composite heterostructure of the zinc oxide nano rods and the silver micron plate is structurally controllable, good in repeatability and stable in product property, and has excellent photocatalytic performance.

Description

technical field [0001] The invention relates to a method for preparing a structure-controllable semiconductor-metal novel composite material, in particular to a method for preparing an advanced composite heterostructure of zinc oxide nanorods-silver microdisks. Background technique [0002] Nanocomposites with heterogeneous structures can obtain novel physical and chemical properties and multifunctional properties that single materials do not have, so they have broad application prospects in many fields "Synthesis of Branched 'nanotrees' by Controlled Seeding of Multiple Branching Events" [Dick, K.A.; ; Larsson, M.W.; Martensson, T.; Seifert, W.; Wallenberg, L.R.; Samuelson, L. Nat. Mater. 3, 380-384. (2004)]. Among them, metal-semiconductor heterojunction composites have unique optical, electrical, and magnetic properties. Taking noble metals (such as Ag) and wide bandgap oxide semiconductors (ZnO) as examples, due to the unique surface plasmon resonance effect (SurfacePla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24C30B29/16C30B29/62C30B7/14
Inventor 杨金虎秦瑶李影金超李杰时东陆
Owner TONGJI UNIV
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