Preparation method of gold nano-particle aggregate material

A technology of gold nanoparticles and aggregates, applied in the field of nanomaterials, can solve the problems of inability to obtain gold nanoparticle aggregate materials and limit the application of gold nanoparticle aggregate materials

Pending Publication Date: 2021-12-10

中红外激光研究院(江苏)有限公司

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Problems solved by technology

However, the above preparation method can only be used to prepare gold nanorods, and gold nanoparticle agg...

Abstract

The invention discloses a preparation method of a gold nano-particle aggregate material. The preparation method comprises the following steps that firstly, a gold seed solution is prepared; a growth solution A, a growth solution B and a growth solution C are prepared, wherein the pH value of C is 5-7; finally, the gold seed solution is mixed with the growth solution A and the growth solution B, so that gold nano-seeds grow gradually; and then the gold seed solution is mixed with the growth solution C, monovalent gold ions are deposited on the surfaces of gold nano-seed particles to form gold nano-particles, silver nitrate is added into the growth solution C under the condition that the pH value is 5-7, nitrate ions are provided and combined with CTA <+> on the outer layer of gold, under the combined action of a surfactant (namely hexadecyl trimethyl ammonium bromide) and the silver nitrate, therefore, repulsion between adjacent head groups on the gold surface is reduced, and the gold nano-particles are aggregated to form the gold nano-particle aggregate material. The whole preparation process is carried out under the condition of normal temperature, heating or stirring is not needed, and chemical polymers or biomolecules do not need to be additionally introduced.

Application Domain

Material nanotechnologyEnergy modified materials +2

Technology Topic

Active agentSurface-active agents +8

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Examples

Experimental program(2)

Example Embodiment

[0020] Example 1:

[0021] Step 1: Preparation of a gold seed solution: A hydride solution having a concentration of 0.01 m; an aqueous solution of ascorbic acid having a concentration of 0.1 m; a water solution having a concentration of 4 mm; aqueous solution of a concentration of 5 mm; concentration of 0.2 m Hexagonyl trimethyl bromide aqueous solution; aqueous hydrochloric acid solution of 1.2 m; aqueous sodium hydroxide solution having a concentration of 0.5 m, add 0.6 ml of borohydride aqueous solution of sodium hydrogenide to 4.5 ml of hexadecana Ammonium bromide aqueous solution and a mixed solution of 0.5 ml of aqueous chlorohydronoate aqueous solution formation of a gold seed solution;

[0022] Step 2: Preparation Solutions A, B, C: Growth Solutions A and B are 0.9 ml of hexamethyltrimetalamaded ammonium ammonium ammonium solution, 0.09 ml of aqueous chloride solution and 0.072 ml of ascorbate aqueous solutions formed mixed Solution; Growing solution C is 0.9 ml of hexadalkyltrimethyla bromide aqueous ammonium ammonium solution, 0.09 ml of chloroethylate, 0.02 ml of nitric acid solution, 0.01 ml of aqueous hydrochloric acid solution, 0.72 ml of ascorbate aqueous solution Solution; gently vibrate the mixed solution to the color disappearance, respectively, to produce growth solutions A, B, C; wherein the pH of the growth solution C is 6;

[0023] Step 3: Preparation of gold nanoparticle aggregate materials: 0.2 ml of gold seed solution was added to 1.8 ml of growth solution A to give a mixed solution A, then add 0.2 ml of mixed solution A to 1.8 ml growth solution B to obtain a mixed solution B, The mixture of 0.2 ml of mixed solution B was added to 18 ml of growth solution C, which was allowed to stand for 15 hours at a temperature of 25 ° C, and then centrifugally washed, and the gold nanoparticle aggregate material was finally obtained.

[0024] like Figure 1 to 3 As shown, the gold nanoparticle aggregate material prepared in Example 1 has a large particle connection point, and the prepared gold nanoparticle aggregate material is directly applied to the substrate, so that it can effectively meet the saturated absorber, Application requirements of photothermal therapeutic drugs, surface enhanced Raman spectroscopy and surface enhance fluorescence sensors.

Example Embodiment

[0025] Example 2:

[0026]Step 1: Preparation of a gold seed solution: A hydride solution having a concentration of 0.01 m; an aqueous solution of ascorbic acid having a concentration of 0.1 m; a water solution having a concentration of 4 mm; aqueous solution of a concentration of 5 mm; concentration of 0.2 m Hexagonyl trimethyl bromide aqueous solution; aqueous hydrochloric acid solution of 1.2 m; aqueous sodium hydroxide solution having a concentration of 0.5 m, add 0.6 ml of borohydride aqueous solution of sodium hydrogenide to 4.5 ml of hexadecana Ammonium bromide aqueous solution and a mixed solution of 0.5 ml of aqueous chlorohydronoate aqueous solution formation of a gold seed solution;

[0027] Step 2: Preparation Solutions A, B, C: Growth Solutions A and B are 0.9 ml of hexamethyltrimetalamaded ammonium ammonium ammonium solution, 0.09 ml of aqueous chloride solution and 0.072 ml of ascorbate aqueous solutions formed mixed Solution; Growing solution C is 0.9 ml of hexadalkyltrimel bromide aqueous ammonium ammonium solution, 0.09 ml of chloroethyric acid aqueous solution, 0.02 ml of nitric acid solution, 0.018 ml of sodium hydroxide aqueous solution, 0.72 ml of ascorbate aqueous solution Mixed solution; gently vibrating each mixed solution to the color disappearance, respectively, to produce growth solutions A, B, C; wherein the pH of the growth solution C is 7;

[0028] Step 3: Preparation of gold nanoparticle aggregate materials: 0.2 ml of gold seed solution was added to 1.8 ml of growth solution A to give a mixed solution A, then add 0.2 ml of mixed solution A to 1.8 ml growth solution B to obtain a mixed solution B, The mixture of 0.2 ml of mixed solution B was added to 18 ml of growth solution C, which was allowed to stand for 22 hours at a temperature of 25 ° C, and then centrifugally washed, and the gold nanoparticle aggregate material was finally obtained.

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