A preparation method of gold nanorods whose aspect ratio can be adjusted in a wide range

A gold nanorod, a large-scale technology, applied in the field of preparation of gold nanorods, to achieve high yield, solve the problems of biological toxicity and biological modification, and improve the effect of properties

Inactive Publication Date: 2011-12-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experimental reports have shown that CTAB has high biological toxicity, which limits the application of gold nanorods prepared by this method in the fields of biological detection and sensing.
In addition, according to the seed growth method in the prior art, it is difficult to obtain gold nanorods with a high yield and a wide size distribution with a short aspect ratio (about 2.0)

Method used

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  • A preparation method of gold nanorods whose aspect ratio can be adjusted in a wide range
  • A preparation method of gold nanorods whose aspect ratio can be adjusted in a wide range
  • A preparation method of gold nanorods whose aspect ratio can be adjusted in a wide range

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of gold seed solution:

[0028] Under the condition of stirring at room temperature, the concentration in 20 mL is cetyltrimethylammonium bromide and In the mixed solution of tetrachloroauric acid, quickly add fully cooled in an ice-water bath 2 ml of the solution was stirred vigorously for 2 minutes and then the stirring was stopped, and a brown-yellow seed solution was obtained after the reaction.

[0029] 2) Preparation of growth solution:

[0030] Prepare the mixed solution of 10ml cetyltrimethylammonium bromide, tetrachloroauric acid and silver nitrate in a clean reactor, wherein the molar concentration of cetyltrimethylammonium bromide is , the molar concentration of tetrachloroauric acid is , the molar concentration of silver nitrate is . Finally, the mixed solution was placed in added to the water bath The crotonic acid solution was stirred evenly, and the solution changed from orange-yellow to colorless, and a growth solution...

Embodiment 2

[0035] 1) Preparation of gold seed solution:

[0036] Under the condition of stirring at room temperature, the concentration in 20mL is cetyltrimethylammonium bromide and In the mixed solution of tetrachloroauric acid, quickly add fully cooled in an ice-water bath 2 ml of the solution was stirred vigorously for 2 minutes and then the stirring was stopped, and a brown-yellow seed solution was obtained after the reaction.

[0037] 2) Preparation of growth solution:

[0038] Prepare a mixture of 10ml cetyltrimethylammonium tetrachloroauric acid and silver nitrate in a clean reactor

[0039] Mixed solution, wherein the molar concentration of cetyltrimethylammonium bromide is , the molar concentration of tetrachloroauric acid is , the molar ratio of silver nitrate and tetrachloroauric acid is 16:3, and finally the mixed solution is placed in added to the water bath The crotonic acid solution was stirred evenly, and the solution changed from orange-yellow to color...

Embodiment 3

[0043] 1) Preparation of gold seed solution:

[0044] Under the condition of stirring at room temperature, the concentration in 20mL is cetyltrimethylammonium bromide and In the mixed solution of tetrachloroauric acid, quickly add fully cooled in an ice-water bath Solution 2ml, vigorously stirred for 2 minutes, then stopped stirring, and obtained a brown-yellow seed solution after the reaction.

[0045] 2) Preparation of growth solution:

[0046] Prepare a mixture of 10ml cetyltrimethylammonium tetrachloroauric acid and silver nitrate in a clean reactor

[0047] Combined solution, wherein the molar concentration of cetyltrimethylammonium bromide is , the molar concentration of tetrachloroauric acid is , the molar concentration of silver nitrate is , and finally put the mixed solution in added to the water bath The crotonic acid solution was stirred evenly, and the solution changed from orange-yellow to colorless, and a growth solution was obtained.

[0048]...

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Abstract

The present invention is a preparation method of gold nanorods whose length-to-diameter ratio can be adjusted in a large range. The strong reducing agent sodium borohydride reduces tetrachloroauric acid to obtain gold seed solution; the preparation of growth solution: prepare the mixed solution of hexadecyltrimethylammonium bromide, tetrachloroauric acid and silver nitrate, and the mol ratio of the three is 20:1:0.1~20:1:5, add crotonic acid solution to obtain a growth solution; growth of gold nanorods: inject gold seed solution into the growth solution, react for 6-12 hours, and obtain gold nanorods. The invention adopts crotonic acid as growth solution modifier, and solves the biological toxicity and biological modification problems caused by CTAB. The yield of the short-length-diameter ratio gold nanorods prepared can be as high as about 90%, the size distribution is narrow, and the length-diameter ratio is about 1.92. The aspect ratio of the prepared gold nanorods can be adjusted in a wide range from 1.9 to 7.5.

Description

Technical field: [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing gold nanorods with adjustable aspect ratios. Background technique: [0002] The physicochemical and photoelectric properties of gold nanoparticles are closely related to their shape and size. The aspect ratio of common gold nanorods is 2-7. Due to the quasi-one-dimensional shape, the surface plasmon resonance absorption peak is split into two, near 520nm The transverse surface plasmon resonance absorption peak and a special longitudinal surface plasmon resonance absorption peak, where the position of the longitudinal surface plasmon resonance absorption peak can be adjusted by changing the aspect ratio of gold nanorods, spanning from the visible region to the near-infrared region. Gold nanorods have special nanometer characteristics, which make them have broad application prospects in the fields of biomedical chemical catalysis, optical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 王著元崔一平邵平宗慎飞
Owner SOUTHEAST UNIV
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