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Method for preparing monodisperse bismuth nano-particles

A bismuth nano- and monodisperse technology, applied in nanotechnology and other directions, can solve the problems of complicated steps, complicated bismuth sources, and complicated methods, and achieve the effects of simple steps, easy implementation and good dispersibility.

Inactive Publication Date: 2012-10-10
EAST CHINA NORMAL UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

At present, there are few preparation methods for monodisperse bismuth nanoparticles, and the methods are relatively complicated. Generally, relatively complex bismuth sources, strong reducing agents and surfactants are used to prepare elemental bismuth nanoparticles. How to synthesize monodisperse bismuth nanoparticles simply and conveniently? Particles have long been the direction of researchers' efforts
[0003] Existing literature reports, such as Maksym Yarema et al. published a paper entitled "Highly Monodisperse Bismuth Nanoparticles and Their Three-Dimensional Superlattices" on JACS (2010 Volume 132 15158-15159) ("High monodisperse bismuth nanoparticles and their three-dimensional Superlattice"), "Large-Scale Synthesis and Characterization of the Size-Dependent Thermoelectric Properties of Uniformly Sized Bismuth Nanocrystals" published by Jae Sung Son et al. on Angew.Chem. Int. Ed (2011 Vol. 50 1363-1366) ("Large-Scale Synthesis of Bismuth Nanoparticles of Uniform Size and Characterization of Thermoelectric Properties Correlated with Particle Size"), although bismuth nanoparticles with high dispersion were obtained, the source of bismuth for their synthesis was relatively complicated, and this The bismuth source is expensive and the steps are cumbersome, which limits the practical promotion and application of this method

Method used

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  • Method for preparing monodisperse bismuth nano-particles

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preparation example Construction

[0021] The present invention proposes a kind of preparation method of monodisperse bismuth nanoparticle, comprises concrete operation steps as follows:

[0022] (1) Add glacial acetic acid to the bismuth source at room temperature, and heat the mixture to 100-180°C to synthesize a bismuth precursor;

[0023] (2) Add oleylamine or oleic acid to the bismuth precursor prepared in step (1), and fully stir evenly. Optionally, add 5–100 mL of octadecene after the stirring step;

[0024] (3) stirring and heating at 100~400° C. to prepare a bismuth nanoparticle solution;

[0025] (4) Centrifuge the solution obtained in step (3) at a speed of 8000 rpm, remove the supernatant and disperse the precipitate in the toluene solution, centrifuge for 5 to 10 times, and finally dissolve the precipitate in toluene , to obtain monodisperse elemental bismuth nanoparticles.

[0026] In the method of the present invention, nitrogen gas is passed into the solution prepared in step (2) before step ...

Embodiment 1

[0030] In this embodiment, oleylamine is used as the encapsulating agent, and the specific steps of the method for preparing monodisperse nanometer elemental bismuth particles of the present invention are as follows:

[0031] (1) At room temperature, add 1 mL of glacial acetic acid to 0.233 g of bismuth trioxide, then heat the mixture to 130°C to synthesize white bismuth acetate, and evaporate the excess acid;

[0032] (2) Add 10 mL of oleylamine to the bismuth precursor (i.e. bismuth acetate) prepared in step (1), and fully stir;

[0033] (3) Into the solution prepared in step (2), feed nitrogen protective gas, stir and heat at 310°C for 4 hours, and add the bismuth nanoparticles under the melting temperature of 285°C to the temperature of low-temperature toluene (temperature-18°C) , 50ml); in this embodiment, the technical effect of preventing oleylamine from being oxidized was achieved by introducing nitrogen protective gas; by adding bismuth nanoparticles into low-temperat...

Embodiment 2

[0037] The present embodiment uses oleic acid as surface-active stabilizer, and its specific steps are as follows:

[0038] (1) Add 1 mL of glacial acetic acid to 0.233 g of bismuth trioxide at room temperature, then heat the mixture to 130°C to synthesize white bismuth acetate, and evaporate the excess acid;

[0039] (2) Add oleic acid to the white bismuth acetate prepared in step (1), the molar ratio of bismuth acetate to oleic acid is 1:3, heat the mixed solution to 130°C and keep it for 3 hours to obtain oleic acid Bismuth; the amount of oleic acid added can also be oleic acid: bismuth precursor molar ratio = 1:6.

[0040] (3) Add 50 mL of octadecene to the solution prepared in step (2), heat at 150° C. for 2 hours, and the heating process is carried out under magnetic stirring to synthesize monodisperse bismuth nanoparticles; in this embodiment, by adding octadecene, The technical effect of controlling the size of bismuth nanoparticles is achieved.

[0041] (4) Centrifu...

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Abstract

The invention discloses a method for preparing monodisperse bismuth nano-particles. The method adopts bismuth acetate as a bismuth source and adopts oleylamine or oleic acid as a package agent and a surface activity stabilizer to be synthesized into the bismuth nano-particles in an organic phase system. The operation steps of the method are simple, the used reagents are smaller in quantity and low in cost, the implementation is easy, and the method is safe and environment-friendly. The bismuth nano-particles prepared by the method has higher yield and good stability.

Description

technical field [0001] The invention relates to a method for preparing inorganic semiconductor nanometer materials, in particular to a method for preparing monodisperse bismuth nanoparticles. Background technique [0002] Since the beginning of the last century, the preparation of monodisperse nanoparticles has become a very challenging topic in the field of sol science. These monodisperse nanoparticles can be used to synthesize basic materials and templates through self-assembly technology to further manufacture three-dimensional photonic crystals, etc. Bulk bismuth is a semimetal possessing exotic properties such as large Fermi wavelength, strong diamagnetism, and high magnetoresistance. Elemental bismuth is often used to study quantum transport and local effects, and theoretical calculations show that the thermoelectric figure of merit of nanostructured semimetal bismuth is relatively high, and nanobismuth also has good application prospects in optical applications. At ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 彭晖王志唐晓东罗春花
Owner EAST CHINA NORMAL UNIVERSITY
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