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Method for synthesizing monocrystal bismuth nano-wire with intense magnetic field abduction

A single crystal bismuth nanometer, strong magnetic field technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problems of complicated procedures, troublesome post-processing, unsatisfactory nanowire diameter, etc., and achieve product crystallinity. Good, simple method, high yield effect

Inactive Publication Date: 2011-02-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are many reports on the synthesis of bismuth nanowires, such as the "electrodeposition method", "vacuum pressure perfusion method", "gas phase template method", and "composite film template extrusion method" characterized by template growth. Among these methods are Some require more stringent conditions, some post-processing is more troublesome (removing templates, etc.), some processes are more complicated, and some nanowire diameters produced cannot meet the requirements of quantum wires; Solvothermal reaction, bismuth nitrate was reduced in ethylenediamine and acetone to prepare bismuth nanowires. Tsinghua University Li Yadong et al. used the solvothermal reduction method of polyols to prepare bismuth nanowires. These two methods do not require templates, and the reaction temperature is low. Simple means, easy to control

Method used

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  • Method for synthesizing monocrystal bismuth nano-wire with intense magnetic field abduction
  • Method for synthesizing monocrystal bismuth nano-wire with intense magnetic field abduction
  • Method for synthesizing monocrystal bismuth nano-wire with intense magnetic field abduction

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Embodiment 1

[0021] a. Weigh 0.2g of sodium bismuthate, add it into a beaker containing 18mL of ethylene glycol, and stir vigorously for 30 minutes;

[0022] b. Transfer the uniformly stirred mixed solution to a polytetrafluoroethylene-lined reaction kettle with a volume of 22mL, and seal it;

[0023] c. Place the reactor in an 8T magnetic field and react at 210°C for 24 hours;

[0024] d. After the reaction is completed, wait for the reaction kettle to cool down to room temperature, release the pressure, open the kettle, and centrifuge to separate the black precipitate obtained by the reaction;

[0025] e. Washing and collecting the collected black precipitates sequentially with ethanol and distilled water respectively, and drying in vacuum at 60° C. for 2 hours to obtain bismuth nanowires. See figure 1 , figure 2 , Figure 5 and Figure 6 . figure 1 The largest peak in the XRD pattern indicates the presence of single crystal bismuth; figure 2 It is a SEM photo, indicating that t...

Embodiment 2

[0027] a. Weigh 0.2g of sodium bismuthate, add it into a beaker containing 18mL of ethylene glycol, and stir vigorously for 30 minutes;

[0028] b. Transfer the uniformly stirred mixed solution to a polytetrafluoroethylene-lined reaction kettle with a volume of 22mL, and seal it;

[0029] c. Place the reaction kettle in a 4T magnetic field and react at 210°C for 24 hours;

[0030] d. After the reaction is completed, wait for the reaction kettle to cool down to room temperature, release the pressure, open the kettle, and centrifuge to separate the black precipitate obtained by the reaction;

[0031] e. Use ethanol and distilled water to wash and collect the black precipitates sequentially, and dry them in vacuum at 60°C for 2 hours to obtain bismuth nanowires, see image 3 and Figure 4 . image 3 The largest peak in the XRD pattern indicates the presence of single crystal bismuth; Figure 4 It is a SEM photo, showing the presence of bismuth nanowires.

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Abstract

The invention discloses a method for thermally synthesizing a single-crystal bismuth nanowire by solvent in a magnetic field. By utilizing the characteristic of anisotropic growth induced by the magnetic field, the single-crystal bismuth nanowire is produced through a polyhydroxy reduction reaction between sodium bismuthate and glycol. The whole reaction process is performed in the magnetic field, and the Bi nanowire produced by the synthesis has a diameter of 40 nanometers and a length of between 10 and 50 microns. The method is simple, convenient and safe, and has high repeatability, high output, and good product crystallinity; and the bismuth nanowire produced by the synthesis can be widely used in the fields such as physics, chemistry, material, micro-electronics and so on. The methodalso provides a novel idea and a novel means for materials which are disadvantageous to grow into nanowires.

Description

technical field [0001] The invention relates to a method for synthesizing single-crystal bismuth nanowires induced by a strong magnetic field, which belongs to the technical field of preparing nanometer materials under the action of a physical field. Background technique [0002] Since the discovery of carbon nanotubes, one-dimensional nanomaterials, such as metal Au, Ag and some other oxides, nitrides, sulfides, nanowires, nanorods and nanotubes, due to their unique optical properties and quantum size effects, in Related quantum components have a wide range of application prospects, and thus have received great attention from researchers. [0003] Among all metals, bismuth has the strongest diamagnetism, the smallest thermal conductivity, the largest resistance, and the largest Hall effect. Correspondingly, it exhibits special physical and chemical effects. Specifically, its Fermi level surface has a strong tendency to anisotropy, has a very low carrier concentration, a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/14B22F9/24C30B29/02C22B30/06
Inventor 任忠鸣任维丽徐永斌邓康钟云波
Owner SHANGHAI UNIV
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