Method for rapidly and continuously preparing size and feature controllable metal nano particles

A technology of metal nanoparticles and metal ions is applied in the field of preparation of metal nanoparticles to achieve the effects of low preparation cost, wide temperature range and overcoming uneven heating of the solution

Inactive Publication Date: 2011-06-08
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many ways to synthesize metal nanoparticles, but for a specific method, only single-morphology metal nanoparticles can be synthesized. Using the same method, the controllable preparation of multi-morphology metal nanoparticles only by adjusting experimental parameters is still

Method used

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  • Method for rapidly and continuously preparing size and feature controllable metal nano particles
  • Method for rapidly and continuously preparing size and feature controllable metal nano particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] See figure 1 .

[0035]The PVP solution B and ethanol C of 0.2mmol / L chloroauric acid solution A, 2mmol / L, respectively pass through metal ion solution feed pipe A, stabilizer solution feed pipe B, reducing agent solution feed pipe C simultaneously and continuously Inject it into the reactor whose pressure is always maintained at atmospheric pressure, adjust the three solution flow rates VA, VB and VC of A, B and C, so that the flow rates of the three are the same, and the mol ratio of chloroauric acid to PVP in the obtained reaction solution is 1 : 10, while using microwaves with a frequency of 900 to 4500 MHz to heat the reactor, the reaction temperature in the reactor is set between room temperature and less than 100 ° C, and the reaction solution is stirred at a stirring rate of 800 rpm, so that Gold ions, PVP and ethanol are in full contact, and redox reactions occur; keep the reaction solution in the reactor and experience microwave irradiation for 1 minute to ob...

Embodiment 2

[0037] See figure 1 .

[0038] The PVP aqueous solution B of 0.6mmol / L chloroauric acid solution A, 6mmol / L and 3mmol / L sodium citrate solution C are fed through metal ion solution feeding tube A, stabilizer solution feeding tube B and reducing agent solution respectively. Feed pipe C is continuously injected into the reactor under atmospheric pressure all the time simultaneously, adjusts A, B and C three solution flow rates, makes the flow rate of the three identical, and in the obtained reaction solution, chloroauric acid: PVP: sodium citrate The molar ratio is 1:10:5, and the microwave heating reactor with a frequency of 900-4500 MHz is used at the same time, so that the reaction temperature in the reactor is set between room temperature and less than 100 ° C, and the stirring rate is 500 rpm. Stir the reaction solution so that the gold ions, PVP and sodium citrate are in full contact, and a redox reaction occurs; keep the reaction solution in the reactor and experience mi...

Embodiment 3～5

[0040] See figure 1 .

[0041] Put 0.2mol / L chloroauric acid aqueous solution A, 20mol / L PVP aqueous solution B and 0.2mol / L sodium citrate solution C through metal ion solution feeding tube A, stabilizer solution feeding tube B, and reducing agent solution respectively. At the same time, the feed pipe C is continuously injected into the reactor whose pressure is always maintained at atmospheric pressure, and the flow rates of A, B and C three solutions VA, VB and VC are adjusted to obtain the reaction liquid in the reactor, and the utilization frequency is 900-4500MHz at the same time The microwave heating reactor is used to set the reaction temperature in the reactor between room temperature and less than 100°C, and the reaction solution is stirred at a stirring rate of 300 rpm to fully contact the gold ions, PVP and sodium citrate , a redox reaction occurs; keep the reaction solution in the reactor and experience microwave irradiation for 3 minutes to obtain solution E, in...

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Abstract

The invention belongs to the field of preparation of metal nano particles, and in particular relates to a method for rapidly and continuously preparing size and feature controllable metal nano particles. In the invention, through controlling a relative flow velocity of a continuously flowing metal complex solution or metal salt solution and a reducing agent solution, the proportion of a metal salt to a reducing agent in a reactor is strictly controlled, metal nano particle sol with required size and feature is prepared in the reactor by using a chemical reducing method, a target solution in the reactor is discharged through introducing nitrogen or air so that the influence of the generated metal nano particle sol to subsequent products is avoided, therefore, the continuous preparation of different sizes and features of metal nano particles is realized.

Description

technical field [0001] The invention belongs to the field of preparation of metal nanoparticles, in particular to a rapid and continuous method for preparing metal nanoparticles with controllable size and shape. Background technique [0002] The atomic and electronic structures of metal nanoparticles are different from metal particles with the same chemical composition. Metal nanoparticles show strong volume effect, quantum size effect, surface effect and macroscopic quantum tunneling effect. They are widely used in optoelectronics, catalysis, chemical sensors, magnetic materials There is a wide range of application prospects in the fields of biological detection and biological detection. For example, silver nanoparticles used in conductive coatings in electronic devices can be sintered at 100 ° C, and circuits can be prepared on resins, plastics and other materials as substrates. The demand for metal nanoparticles has increased substantially. [0003] At present, a few ind...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 李明珠宋延林
Owner INST OF CHEM CHINESE ACAD OF SCI
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