Method for preparing silver/silver sulfide nanowire with core shell structure

A core-shell structure, nanowire technology, applied in the field of photoelectrochemistry, can solve complex problems

Inactive Publication Date: 2015-09-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above methods have successfully prepared silver sulfide nanowires, they all need to use more complicated devices and take a long time to react, so it is still necessary to develop some mild and convenient general methods to prepare Ag 2 S nanowire

Method used

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  • Method for preparing silver/silver sulfide nanowire with core shell structure
  • Method for preparing silver/silver sulfide nanowire with core shell structure

Examples

Experimental program
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Effect test

Embodiment 1

[0016] A certain amount of polyvinylpyrrolidone was weighed, dissolved in secondary water, and silver nanowires were dispersed therein (the molar ratio of polyvinyl monomer to silver nanowires was 3:1). To prepare the ferric chloride solution, slowly add the ferric chloride solution (the molar ratio of ferric chloride to silver is 1:1) dropwise into the mixture. After continuing to stir for 30 min, centrifuge and wash 3 times with secondary water. Then take the same amount of polyvinylpyrrolidone and fully dissolve it in water, and evenly disperse the nanowires converted into silver silver chloride, slowly add sodium sulfide solution (half of the molar amount of ferric chloride) dropwise, react for 30min and then centrifuge and wash. Disperse in 60mL of water, put into 180℃ oven for 12h. After the end, take out and wash by centrifugation to obtain silver silver sulfide nanowires.

example 1

[0017] The scanning electron micrograph of the silver sulfide nanowire of example 1 gained is as figure 1 . It can be seen from the figure that the morphology of the obtained silver silver sulfide nanowires is relatively uniform, the length is 5-10 μm, and the surface becomes rough due to the reaction. Its composition changes can be seen from the XRD pattern ( figure 2 ), silver nanowires were oxidized by ferric chloride and converted to silver silver chloride, and then replaced with sufficient sodium sulfide to form silver silver sulfide.

Embodiment 2

[0019] A certain amount of polyvinylpyrrolidone was weighed, dissolved in secondary water, and silver nanowires were dispersed therein (the molar ratio of polyvinyl monomer to silver nanowires was 3:1). To prepare the ferric chloride solution, slowly add the ferric chloride solution (the molar ratio of ferric chloride to silver is 1:2) dropwise into the mixture. After continuing to stir for 30 min, centrifuge and wash 3 times with secondary water. Then take the same amount of polyvinylpyrrolidone and fully dissolve it in water, and evenly disperse the nanowires converted into silver silver chloride, slowly add sodium sulfide solution (half of the molar amount of ferric chloride) dropwise, react for 30min and then centrifuge and wash. Disperse in 60mL of water, put into 180℃ oven for 12h. After the end, take out and wash by centrifugation to obtain silver silver sulfide nanowires.

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Abstract

The invention relates to a method for preparing a silver/silver sulfide nanowire with a core shell structure. The method for preparing the material comprises the first step of scattering a silver nanowire regular in shape in a water solution containing a macromolecule protective agent, adding ferric chloride water solution to oxidize the surface of a silver wire to obtain a silver/silver chloride nanowire with a core shell structure; the second step of scattering the generated silver/silver chloride nanowire in the water solution, adding a water solution containing a sulphur source (thioacetamide, sodium sulfide or potassium sulfide), obtaining the silver/silver sulfide nanowire with the core shell structure; and the third step of performing hydrothermal crystallization on the obtained silver/silver sulfide nanowire. The method for preparing the silver/silver sulfide nanowire with the core shell structure has the advantages of being simple in preparation process and controllable in shape. The nanowire with the silver/silver sulfide core shell structure can be used for the fields of photoelectrodes and photocatalysis and the like.

Description

technical field [0001] The invention relates to a method for preparing a core-shell structure silver-silver sulfide nanowire which can be used for preparing photoelectrode materials, and belongs to the field of photoelectrochemistry. Background technique [0002] The nanomaterials of the core-shell mechanism can combine the characteristics of different materials to obtain more excellent properties to meet different application requirements. Among them, one-dimensional nano-core-shell materials have attracted extensive attention of researchers due to their superior physical and chemical properties. So far, many methods have been developed for the preparation of one-dimensional core-shell nanomaterials. Among them, the most direct and general method is the template-directed method, which is to directly generate a shell of other materials on the surface of the nanowire. [0003] Among the many sulfide semiconductors, the inherent narrow band gap (1.0eV) of silver sulfide leads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C01G5/00B82Y40/00B82Y30/00
Inventor 田宝柱吴佩倚岳申之张金龙刘亚相开强吴强芳张萍
Owner EAST CHINA UNIV OF SCI & TECH
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