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Method for preparing gold nano-rod particles coated with silica layer

A technology of gold nanorods and silicon dioxide, which is applied in the field of preparing gold nanorod particles coated with a silicon dioxide layer on the surface, can solve the problems of harsh condition control, complicated operation, and difficulty in hydrophobicizing the surface of gold nanorods, and achieves Uniform silica layer, easy control of thickness, and easy operation

Inactive Publication Date: 2008-07-30
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology

However, although the CTAB micellar environment is beneficial to the stability of gold nanorod particles, the existence of CTAB molecules brings a series of problems: (1) The stable existence of CTAB molecules on the surface of gold nanorods makes the surface of gold nanorods hydrophobic. become difficult [Nikoobakht, B. El-Sayed, M.A. Langmuir 2001, 17, 6368.]
(2) The presence of CTAB molecules on the surface of gold nanorods makes it difficult to modify the surface of gold nanorods, and CTAB molecules are biologically toxic, which severely limits the application of gold nanorods in the biological field
[0004] But in this method, there are following problems: (1) complicated operation
(2) Conditional control requirements are harsh

Method used

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  • Method for preparing gold nano-rod particles coated with silica layer

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preparation example Construction

[0016] The specific basic procedure for preparing silica-coated gold nanoparticles:

[0017] (1) Referring to literature [J.Phys.Chem.B 2005, 109, 13857.] to prepare CTAB-stabilized gold nanorod particles.

[0018] (2) Preparation of silica-coated gold nanoparticles (Au rod @SiO 2 ): centrifuging the gold nanorod particles prepared in step (1), and dispersing the precipitate in ultrapure water. Then the pH value of the gold nanorod particle solution was adjusted to ~10 with ammonia water. Then add tetraethyl orthosilicate (TEOS) ethanol solution, stir (magnetic stirring, mechanical stirring, vibration stirring, etc.), let the solution continue to react. After the reaction was completed, the Au was collected by centrifugation rod @SiO 2 , and then washed with water and ethanol, respectively, to obtain silica-coated gold nanoparticles. SiO can be regulated by controlling the amount of different TEOS added 2 shell thickness.

Embodiment 1

[0020] (1) Prepare gold nanorod particles with reference to the literature [J.Phys.Chem.B 2005, 109, 13857];

[0021] (2) Preparation of silica-coated gold nanoparticles (Au rod @SiO 2 ): 20 mL of the gold nanorod particle solution prepared in step (1) was centrifuged, and the precipitate was dispersed in ultrapure water. Then the pH value of the gold nanorod particle solution was adjusted to ~10 with ammonia water. Then add 4 mL of TEOS ethanol solution with a concentration of 1 mmol / L, and use mechanical stirring to allow the solution to continue to react. After the reaction was completed, the Au was collected by centrifugation rod @SiO 2 , and then washed with water and ethanol, respectively. Finally the silica as the shell of the Au rod @SiO 2 The nanoparticles were dispersed in ethanol to obtain gold nanorod particles coated with a silica layer with a thickness of about 6 nm. The transmission electron micrograph of gold nanorods wrapped in silicon dioxide is shown...

Embodiment 2

[0023] (1) Prepare gold nanorod particles with reference to the literature [J.Phys.Chem.B 2005, 109, 13857];

[0024] (2) Preparation of silica-coated gold nanoparticles (Au rod @SiO 2 ): 20 mL of the gold nanorod particle solution prepared in step (1) was centrifuged, and the precipitate was dispersed in ultrapure water. Then the pH value of the gold nanorod particle solution was adjusted to ~10 with ammonia water. Then add 8 mL of TEOS ethanol solution with a concentration of 1 mmol / L, and use magnetic stirring to allow the solution to continue to react. After the reaction was completed, the Au was collected by centrifugation rod @SiO 2 , and then washed with water and ethanol, respectively. Finally, the silicon dioxide-coated gold nanorod particles with a thickness of about 16 nm were obtained, as shown in FIG. 2 in a transmission electron microscope photo. It can be clearly seen from the figure that the gold nanorods are wrapped with a silicon dioxide layer.

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Abstract

The invention discloses a method for preparing golden nanorod particles coated with silicon dioxide layers on the surfaces. The method adopts the steps that ammonia water is charged into a golden nanoparticle solution with stable CTAB to form a golden nanorod solution, and the golden nanorod solution is mixed with an ethyl alcohol solution of tetraethylorthosilicate for reaction, to obtain the golden nanoparticles coated with the silicon dioxide layers on the surfaces. In the invention, even silicon dioxide layers can be prepared on the surfaces of the golden nanorods with stable CTAB without the assistance of a polymer or a polyelectrolyte, and the thickness of the silicon dioxide layers can be controlled by changing the quantity of TEOS, therefore, the invention has the advantages of simple operation and temperate condition, and has universal guiding significances for the preparation of the anisotropic nano material coated with the silicon dioxide layers.

Description

technical field [0001] The invention relates to a method for preparing gold nanorod particles whose surface is covered with a silicon dioxide layer. Background technique [0002] In recent years, various chemical methods have been developed to prepare anisotropic metal nanoparticles [J.Pérez-Juste, et al.Coord.Chem.Rev.2005, 249, 1870], the most successful of which is the use of cation The surfactant cetyltrimethylammonium bromide (CTAB) was used as a morphology-inducing agent to control size and shape. So far, the use of CTAB solution to control size and shape has been most clearly studied in the synthesis of gold nanorods. People can achieve fine adjustment of the optical properties of gold nanorods, by controlling the ratio of the long and short axes of gold nanorods, the fine adjustment of its optical properties from the visible region to the near-infrared region can be realized [B.Nikoobakht, M.A.El-Sayed, Chem. Mater. 2003, 15, 1957; J. Pérez-Juste, et al. Adv. Funct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/62C09C3/12
Inventor 马占芳
Owner CAPITAL NORMAL UNIVERSITY
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