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Process for producing golden nano stick with short length-diameter ratio

A technology of short and long gold nanorods, which is applied in the field of preparation of gold nanorods, can solve problems such as the difficulty of biological modification of the surface of gold nanorods, the difficulty of hydrophobicizing the surface of gold nanorods, and the biological toxicity of CTAB molecules, achieving high yield, Product size distribution is narrow, reducing the effect of post-treatment

Inactive Publication Date: 2009-01-14
BEIHANG UNIV
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Problems solved by technology

However, in the seed growth method disclosed in the above literature, although the CTAB micellar environment is beneficial to the stability of gold nanorod particles, the presence of a large number of CTAB molecules in the growth solution has brought some problems: (1) a large number of CTAB molecules in the growth solution The surface of gold nanorods exists stably, making it difficult to hydrophobize the surface of gold nanorods [Nikoobakht, B.; EI-Sayed, M.A. Langmuir 2001, 17, 6368]; (2) A large number of CTAB molecules exist stably on the surface of gold nanorods , making it more difficult to modify the surface of gold nanorods, and CTAB molecules are biotoxic, which seriously affects the application of gold nanorods in the biological field
[0004] Moreover, according to the seed growth method in the prior art, it is difficult to obtain gold nanorods with a higher yield and a wider size distribution with a short aspect ratio (about 2)

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  • Process for producing golden nano stick with short length-diameter ratio
  • Process for producing golden nano stick with short length-diameter ratio

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preparation example Construction

[0034] The preparation method of the short aspect ratio gold nanorod of the present invention is realized through the following steps:

[0035] 1). Preparation of gold seed solution: under stirring at room temperature, add a strong reducing agent solution to the mixed solution of cetyltrimethylammonium bromide and tetrachloroauric acid at a concentration of (0.05-0.1mol / L) to control The molar ratio of reducing agent to tetrachloroauric acid is 1.2, the molar concentration of cetyltrimethylammonium bromide in the mixed solution is 0.05~0.1mol / L, and the molar concentration of tetrachloroauric acid is 1×10 -4 ~5×10 -3 mol / L, a strong reducing agent reduces tetrachloroauric acid to obtain a seed solution. Continue to stir the seed solution prepared above for 30 min to escape excess H 2 .

[0036] 2). Preparation of growth solution: prepare a mixed solution of DDAB, tetrachloroauric acid and silver nitrate, the mixed solution is orange-yellow. The molar concentration of DDAB ...

Embodiment 1

[0039] 1). Preparation of gold seed solution:

[0040] Under stirring conditions at room temperature, add 0.01mol / L NaBH fully cooled in an ice-water bath at 0°C to 10ml of a mixed solution of 0.1mol / L cetyltrimethylammonium bromide and 0.0005mol / L tetrachloroauric acid 4 The solution was 0.6ml, and a brown-yellow seed solution was obtained after the reaction. Continue to stir the seed solution prepared above for 30 min to escape excess H 2 .

[0041] 2). Preparation of growth solution: prepare a mixed solution of 10ml DDAB, tetrachloroauric acid and silver nitrate in a clean reactor, wherein the molar concentration of DDAB is 0.005mol / L, and the molar concentration of tetrachloroauric acid is 0.0005mol / L L, the molar concentration of silver nitrate is 10 -4 mol / L, the molar ratio of silver nitrate to tetrachloroauric acid is 0.2. Finally, 80 μL of 0.1 mol / L ascorbic acid solution was added to the mixture, the molar ratio of ascorbic acid to tetrachloroauric acid was contr...

Embodiment 2

[0044] 1). Preparation of gold seed solution: under stirring at room temperature, add 0.1 mol / L hexadecyltrimethylammonium bromide and 0.005 mol / L tetrachloroauric acid mixed solution into 0 ℃ ice-water bath to fully Cooled 0.1mol / L potassium borohydride solution 0.6ml, reacted to obtain a brownish yellow seed solution. Continue to stir the seed solution for 30 min to escape excess H 2 .

[0045] 2). Preparation of growth solution: Prepare 10ml of DDAB, tetrachloroauric acid and silver nitrate mixed solution in a clean reactor, the molar concentration of DDAB in the mixed solution is 0.01mol / L, and the molar concentration of tetrachloroauric acid is 0.005mol / L , the molar concentration of silver nitrate is 0.002mol / L, and the molar ratio of silver nitrate and tetrachloroauric acid is 0.4. Finally, 1.25 mL of 0.1 mol / L ascorbic acid solution was added to the mixture, the molar ratio of ascorbic acid to tetrachloroauric acid was controlled to be 2.5, and the solution was shake...

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Abstract

The invention discloses a short length-diameter ratio gold nanometer rod preparation method. A strong reducing agent of sodium borohydride is added in a hexadecyl trimethyl ammonium bromide surface modifying agent solution to reduce gold acid chloride and obtain a gold seed solution; a mixed fluid of didodecyl dimethyl ammonium bromide, gold acid chloride and silver nitrate is prepared, and an ascorbic acid solution is added thereto for obtaining a growth solution; the seed solution of a certain amount is filled into the growth solution to react for 5 to 12 hours, so as to obtain the short length-diameter ratio gold nanometer rod. The operation of the method is simple, the gold nanometer rod production rat is high, and the size distribution is narrow.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of gold nanorods. 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 biomedicine, chemical catalysis, optical devices, and optoel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/02C30B29/62C30B7/14B22F9/24
Inventor 郭林李静
Owner BEIHANG UNIV
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