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Self-assembly preparation of one-dimensional nano-structure

A nanostructure and self-assembly technology, applied in the field of self-assembly preparation of Au or Ag nanoparticles, can solve the problems of restricting one-dimensional nanostructure research, complicated product separation steps, and difficult to repeat the process, which is beneficial to repetition and environmental protection. , easy to repeat and apply, easy to manipulate effects

Inactive Publication Date: 2014-01-22
TIANJIN POLYTECHNIC UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, so far, the preparation of one-dimensional nanostructures is still limited to the template method or the addition of small molecules as linkers, such as organic compounds with mercapto groups. These methods have difficulties such as high cost, complicated product separation steps, and difficult to repeat the process, which are difficult to overcome. It also greatly limits the study of one-dimensional nanostructures

Method used

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  • Self-assembly preparation of one-dimensional nano-structure

Examples

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Embodiment 1

[0027] Take 50mL of deionized water and add it to a three-neck flask, then add about 2mL of HAuCl 4 (concentration of 25mM) solution, stirred, heated to about 100 degrees, refluxed, then added 5mL of sodium citrate solution (concentration of 38.8mM), reacted for about 10min to obtain a colloidal solution of Au. Take about 2mL of gold colloidal solution and centrifuge to obtain a precipitate, disperse it in 5mM NaCl solution, add ethanol, the mixed solution of ethanol / water with a volume ratio of 9:1, let it stand for 60min, then add 0.5mL ammonia water in ethanol solution, Stir to obtain a one-dimensional gold nanostructure ( figure 1 ). UV-vis spectrum ( figure 2 ) proves that the one-dimensional structure has two obvious SPR absorption peaks, and the absorption peak located at about 600nm is the long-axis plasmon coupling peak, which proves the formation of one-dimensional structure, while the transmission electron microscope picture ( image 3 ) fully demonstrates that ...

Embodiment 2

[0029] Take 50mL of deionized water and add it to a three-neck flask, then add about 2mL of HAuCl 4 (concentration of 25mM) solution, stirred, heated to about 100 degrees, refluxed, then about 1.5mL of sodium citrate solution (concentration of 38.8mM) was added and reacted for about 10min to obtain a colloidal solution of Au. Take about 2mL of gold colloidal solution and centrifuge to obtain a precipitate, disperse it in 15mM NaCl solution, add ethanol, the mixed solution of ethanol / water with a volume ratio of 9:1, let it stand for 60min, then add 0.5mL ammonia water in ethanol solution, stir A one-dimensional gold nanostructure was obtained. UV-Vis spectra ( Figure 4 ) proves that the one-dimensional structure has two obvious SPR absorption peaks, and the absorption peak above 700nm is the long-axis plasmon coupling peak, which proves the formation of a one-dimensional structure and fully demonstrates that most of the particles are assembled into a one-dimensional nanostru...

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Abstract

The invention relates to self-assembly preparation of a one-dimensional nano-structure. According to the self-assembly preparation, (1) precious metal nano-particles are synthesized in an aqueous solution system according to the liquid phase synthesis method; (2) the obtained precious metal nano-particles are dispersed in a mixed solution of inorganic salt and alcohol; (3) a certain amount of an alkaline solution such as an ethanol solution of ammonium hydroxide is taken and added to the mixed solution, the mixed solution is stirred for a certain time and centrifuged, and therefore the metal nano-structure which is of a self-assembly chain shape is obtained. According to the self-assembly preparation of the one-dimensional nano-structure, the one-dimensional chain-shaped nano-structure with different particle sizes can be assembled, any template does not needed, the assembly process is simple and easy to control, separation is easy, a preparation system is environmentally friendly, no toxic and harmful solution is added, the technologies in the preparation process and the assembly process are simple, the preparation cost is low, a solution system is low in price, the application range is wide, and the one-dimensional nano-structure is easy to prepare in a large scale.

Description

technical field [0001] The invention relates to the self-assembly preparation of one-dimensional nanostructure of noble metal nanoparticles, in particular to the self-assembly preparation method of Au or Ag nanoparticles. Background technique [0002] Noble metal nanoparticles, especially Au or Ag nanoparticles with surface plasmon resonance (SPR), have been widely concerned by many researchers in industry and scientific research, especially Au or Ag nanoparticles. More complex advanced structures, such as one-dimensional nanostructures, can be formed through self-assembly. In this way, the coupling of electrons or plasmonic effects can be formed between particles, and this structure is expected to be widely used in photoelectric conversion, biothermotherapy, biosensors, surface Raman enhanced spectroscopy, nanodevices and other fields. [0003] The self-assembly of metal nanoparticles has become a hotspot in the preparation and application of nanostructures, especially the...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82B3/00B82Y40/00
Inventor 尹振高建谭小耀
Owner TIANJIN POLYTECHNIC UNIV
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