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Method for preparing SiO2-coated Au@Ag core-shell nanorod

A nanorod and core-shell technology, applied in the direction of coating, etc., can solve the problems of easy mutual aggregation of AuAg core-shell nanorods, cumbersome preparation process, strong biological toxicity, etc., and achieve good dispersion, simple method, and low biological toxicity. Effect

Inactive Publication Date: 2015-12-16
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problem that AuAg core-shell nanorods are easy to aggregate and have strong biological toxicity in the organic phase, and the existing SiO 2 The preparation process of coated AuAg core-shell nanorods is cumbersome and time-consuming, and it provides a simple and time-consuming SiO 2 Method for coating AuAg core-shell nanorods

Method used

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  • Method for preparing SiO2-coated Au@Ag core-shell nanorod
  • Method for preparing SiO2-coated Au@Ag core-shell nanorod
  • Method for preparing SiO2-coated Au@Ag core-shell nanorod

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Embodiment 1

[0027] 1. Preparation of Au nanorods by seed growth method

[0028] Add 200 μL 0.01mol / L chloroauric acid aqueous solution and 48 μL 0.1mol / L sodium borohydride aqueous solution (stored in the refrigerator at 0-4°C) to 8 mL of 0.1mol / LCTAB aqueous solution, the color becomes brownish yellow, stir evenly, and then put Standing and reacting in an oven at 30° C. for 2 hours to obtain gold seed sol.

[0029] To 20 mL of 0.1 mol / L cetyltrimethylammonium bromide aqueous solution, add 1 mL of 0.01 mol / L chloroauric acid aqueous solution, 250 μL of 0.01 mol / L silver nitrate aqueous solution, 33.5 μL of 38% hydrochloric acid aqueous solution, 160 μL of 0.1 mol / L ascorbic acid aqueous solution was stirred evenly to obtain a seed growth solution. Add 10 μL of gold seed sol to the obtained seed growth solution, stir evenly, then put it in an oven and let it stand for 12 hours at 30°C to react for 12 hours, centrifuge, wash with deionized water, and obtain Au nanorods (see figure 1 ).

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Embodiment 2

[0035] Step 1 and Step 2 of this embodiment are the same as those of Embodiment 1. In the preparation of AuAgSiO 2In step 3 of core-shell nanorods, add 2mL of AuAg core-shell nanorods into 16mL of deionized water, ultrasonically disperse evenly, add 0.05g of polyvinylpyrrolidone with a number average molecular weight of 10,000, stir at room temperature for 1 hour, add 50mL of isopropanol, and ultrasonically disperse Evenly, add 2.5mL ammonia water, and dropwise add 20μL tetraethyl orthosilicate, react at 40°C for 3.5 hours, wash with deionized water and ethanol, respectively, to obtain SiO 2 AuAgSiO coated with a thickness of about 30nm 2 Core-shell nanorods (see Figure 4 ).

Embodiment 3

[0037] Step 1 and Step 2 of this embodiment are the same as those of Embodiment 1. In the preparation of AuAgSiO 2 In step 3 of core-shell nanorods, add 2mL of AuAg core-shell nanorods into 16mL of deionized water, ultrasonically disperse evenly, add 0.05g of polyvinylpyrrolidone with a number average molecular weight of 10,000, stir at room temperature for 1 hour, add 50mL of isopropanol, and ultrasonically disperse Evenly, add 4 mL of ammonia water, and dropwise add 40 μL of tetraethyl orthosilicate, react at 40 °C for 3.5 hours, wash with deionized water and ethanol, respectively, to obtain SiO 2 AuAgSiO coated with a thickness of about 70nm 2 Core-shell nanorods (see Figure 5 ).

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Abstract

The invention discloses a method for preparing a SiO2-coated Au@Ag core-shell nanorod. The method is characterized by firstly carrying out surface modification on an Au@Ag core-shell nanorod by adopting polyvinylpyrrolidone, then adding the Au@Ag core-shell nanorod modified with polyvinylpyrrolidone to isopropanol and using tetraethyl orthosilicate as a precursor and ammonia water as a catalyst to react at 35-50 DEG C for 2-4 hours, thus obtaining the Au@Ag@SiO2 core-shell nanorod. The preparation method has the effects of not only reducing the preparation time of the SiO2-coated Au@Ag core-shell nanorod but also solving the problem that the Au@Ag core-shell nanorod has poor dispersibility in organic phases and reducing the biotoxicity of the Au@Ag core-shell nanorod and provides a basis for application of the Au@Ag core-shell nanorod to the fields of biological detection, drug delivery, photothermal therapy, surface fluorescence enhancement, catalysis, and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanomaterials, in particular to a simple and rapid preparation of SiO 2 Method for coating AuAg core-shell nanorods. Background technique [0002] Surface plasmon is a collective oscillation state formed when light interacts with free electrons in noble metals. The free electrons and the light wave electromagnetic field have the same resonance frequency. It is a non-radiative localized mode existing on the metal surface. By changing the nanostructure of the metal surface, and then changing its effect on light waves, the tuning of the surface plasmon resonance properties can be achieved, which provides the possibility for the development of new photonic devices, optical sensors, and biological detection. [0003] AuAg core-shell nanorods have unique surface plasmon resonance properties. Compared with spherical noble metal nanoparticles, AuAg core-shell nanorods can continuously adjust the s...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02
Inventor 郑海荣郭静霞董军王朝晋王瑞博李晓毅
Owner SHAANXI NORMAL UNIV
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