Method for carrying out controlled synthesis of nano-gold collosol by utilizing thioalcohol

A nano-gold sol and thiol technology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of precise control of the monodispersity of nanoparticle size and other problems to be explored, and achieve simple technical solutions Effect

Inactive Publication Date: 2017-08-08
SHANGHAI INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the influence of the concentration of different types of organic phases on the precise

Method used

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  • Method for carrying out controlled synthesis of nano-gold collosol by utilizing thioalcohol

Examples

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Effect test

Embodiment 1

[0021] Preparation and characterization of 15nm gold particles synthesized by thiol heating method:

[0022] (1) Preparation of 2.5 nanometer gold seeds:

[0023] First 3.0 grams of tetraoctylammonium bromide form an organic phase in 160 milliliters of toluene, then add 50 milliliters of 1.92 grams of reactant tetrachloroauric acid, then add 11 mg of decylthiol, and finally add 25 milliliters of reducing agent 0.38 grams of sodium borohydride solution was stirred for 12 hours to obtain gold seeds (2.5 nanometers) assembled on the surface of the particles by replacing tetraoctyl ammonium bromide with mercaptan, and dispersed in the toluene solution;

[0024] (2) Different concentrations of thiols control the growth of gold seeds

[0025] In the above-mentioned 235 milliliters of gold seeds / toluene solution, add decyl mercaptan 8.60g (0.21 mol / liter in the system), i.e. 10 milliliters of pure decyl mercaptan, and 112 mg of reactant tetrachloroauric acid solution (0.0014 mol / lit...

Embodiment 2

[0027] Preparation and characterization of 9nm gold particles synthesized by thiol heating method:

[0028] (1) Preparation of 2.5 nanometer gold seeds: the present invention is in order to investigate the influence of mercaptan variation factors in the growth process of gold seeds on the particle size, therefore reducing the amount of variation without changing the synthetic steps of gold seeds, that is, the method is the same Example 1. The types and concentrations of reagents used remained unchanged.

[0029] (2) Different concentrations of thiols control the growth of gold seeds

[0030] Consider that the present invention is in order to investigate the influence of the mercaptan variation factor in the gold seed growth process on the particle size, so reduce the variable amount, do not change the kind of mercaptan, that is: in the above-mentioned 235 milliliters of gold seeds / toluene solution In, add the decanethiol of 13.32g (0.325 mol / liter in the system), promptly 15...

Embodiment 3

[0032] Preparation and characterization of 6nm gold particles synthesized by thiol heating method:

[0033] (1) Preparation of 2.5 nanometer gold seeds: the present invention is in order to investigate the influence of mercaptan variation factors in the growth process of gold seeds on the particle size, therefore reducing the amount of variation without changing the synthetic steps of gold seeds, that is, the method is the same Example 1. The types and concentrations of reagents used remained unchanged.

[0034] (2) Different concentrations of thiols control the growth of gold seeds

[0035] Consider that the present invention is in order to investigate the influence of the mercaptan variation factor in the gold seed growth process on the particle size, so reduce the variable amount, do not change the kind of mercaptan, that is: in the above-mentioned 235 milliliters of gold seeds / toluene solution In, add 40.97g decyl mercaptan (1.0 mol / liter in the system), that is, 48.7 mi...

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Abstract

The invention discloses a method for carrying out controlled synthesis of nano-gold collosol by utilizing thioalcohol. The method comprises the following steps: firstly, filling thioalcohol on the surface of gold seeds coated with protective agent; then changing concentration of thioalcohol in a heating process of growing seeds by utilizing reducing agent to realize different growth degrees. All in all, the using amount of thioalcohol in the synthesis process of the seeds is extremely small, thioalcohol is needed to develop a main action in the growth process of the seeds, and therefore, the using amount is dramatically increased. According to the method, the size of nano-gold particles can be accurately controlled, and relatively good monodispersity can be obtained; by means of scanning electron microscopy, the size and the shape of the nano-gold can be obtained, and finally, association between the concentration of thioalcohol and the particle size of the nano-gold is built; and therefore, important guiding significance on selection of surface controlling agent of nano-particles and controlled preparation of nano-particles in the nanotechnology can be achieved.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a method for controllably synthesizing nano-gold sol by utilizing thiol. Background technique [0002] Many studies have shown that the development of the surface properties of nanoparticles is closely related to their particle size monodispersity. Technology matters. Synthetic methods for the preparation of gold nanoparticles using seed crystals in aqueous solution have been reported many times. For example, gold seeds prepared by gold salt reduction in the presence of citrate as capping agent. Whereas in seed growth, the fundamental understanding of the growth mechanism is the reduction of Au(III) on the surface of smaller nanoparticles by citrate or hydroxylamine as reducing agents at room temperature. This type of growth mechanism has been considered for the synthesis of Au nanorods (20–100 nm) in the presence of trace amounts of silver ions. [000...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0545
Inventor 成汉文陈浩天翟森茂钱爽马林燕罗谨
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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