Preparation method of bismuth nanocrystalline

A bismuth nanometer, bismuth hydroxide technology, applied in nanotechnology, chemical instruments and methods, single crystal growth and other directions, to achieve the effects of good stability, easy control of experimental conditions, and easy implementation

Inactive Publication Date: 2013-12-11
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of existing bismuth nanocrystal preparation methods, and provide a method for preparing bismuth nanocrystals with simple operation, low cost and high purity

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  • Preparation method of bismuth nanocrystalline
  • Preparation method of bismuth nanocrystalline

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Embodiment 1

[0015] At room temperature, 0.64g (0.002mol) BiCl 3 , 50mL of 0.5mol / L NaOH aqueous solution was added to a 100mL beaker, magnetically stirred for 30 minutes, centrifuged after the reactants no longer changed, the supernatant was discarded, and the pale yellow bismuth hydroxide precipitate was added to a 150mL deionized water In a beaker, stir well and then add 0.2g o-phenanthroline, stir at room temperature for 1 hour, use a constant pressure funnel to drop 100mL of 0.1mol / L NaBH at a rate of 1-2 drops / second 4 Aqueous solution, BiCl 3 With NaOH, o-phenanthroline, NaBH 4 The mol ratio of the solution is 1:12.5:0.5:5. After the dropwise addition, continue to stir for 2 hours, and the gained solution is centrifuged 3 times with absolute ethanol and deionized water at a speed of 4200 rpm to obtain a black precipitate. The black precipitate was dried at a constant temperature of 40° C. for 4 hours to obtain gray-black bismuth nanocrystals.

[0016] The prepared product was cha...

Embodiment 2

[0021] At room temperature, 0.64g (0.002mol) BiCl 3 , Add 20mL of 0.5mol / L NaOH aqueous solution into a 100mL beaker, stir magnetically for 60 minutes, centrifuge after the reactants no longer change, discard the supernatant, and add the pale yellow bismuth hydroxide precipitate into a 150mL deionized water In a beaker, stir well and then add 0.05g o-phenanthroline, stir at room temperature for 2 hours, use a constant pressure funnel to drop 20mL of 0.1mol / L NaBH at a rate of 1-2 drops / second 4 Aqueous solution, BiCl 3 With NaOH, o-phenanthroline, NaBH 4 The mol ratio of the solution is 1:5:0.125:1. After the dropwise addition, continue to stir for 2 hours, and the solution obtained is centrifuged 5 times with dehydrated alcohol and deionized water at a speed of 4200 rpm to obtain a black precipitate. The black precipitate was dried at a constant temperature of 40°C for 4 hours to obtain gray-black bismuth nanocrystals (see Figure 4 ).

Embodiment 3

[0023] At room temperature, 0.64g (0.002mol) BiCl 3 , Add 60mL of 0.5mol / L NaOH aqueous solution into a 100mL beaker, stir magnetically for 30 minutes, centrifuge after the reactants no longer change, discard the supernatant, and add the pale yellow bismuth hydroxide precipitate into a beaker containing 150mL deionized water In a beaker, stir well and then add 0.4g o-phenanthroline, stir at room temperature for 1 hour, add 200mL of 0.1mol / L NaBH dropwise at a rate of 1-2 drops / second with a constant pressure funnel 4 Aqueous solution, BiCl 3 With NaOH, o-phenanthroline, NaBH 4 The mol ratio of the solution is 1:15:1:10. After the dropwise addition, continue to stir for 1 hour, and the solution obtained is centrifuged 3 times with absolute ethanol and deionized water at a speed of 4200 rpm to obtain a black precipitate. The black precipitate was dried at a constant temperature of 50°C for 5 hours to obtain gray-black bismuth nanocrystals (see Figure 5 ).

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Abstract

The invention discloses a preparation method of bismuth nanocrystalline. BiCl3 is taken as a bismuth source, phenanthroline is used as a surface modifier and NaBH4 is used as a reducing agent, and the bismuth nanocrystalline is synthesized in a water phase by a liquid phase surface modifying reduction method. The preparation method of bismuth nanocrystalline provided by the invention is simple in operation steps; as the types of the raw materials used are few, the preparation method is low in cost, easy to implement, and safe and environment-friendly; the experimental equipment is simple and the experimental conditions are easy to control; the bismuth nanocrystalline prepared by the method is high in purity.

Description

technical field [0001] The invention belongs to the technical field of nanometer metal material preparation, and in particular relates to a method for preparing bismuth nanocrystals. Background technique [0002] Bismuth is a typical semimetal with a rhombohedral structure that exhibits many unique electronic properties. Such as highly anisotropic Fermi surface, larger carrier mean free path (0.4nm and 100nm at 3k and 300k, respectively), smaller effective electron mass (about 9.11×10 -34 kg), these properties make it an ideal material for studying the quantum confinement effect, volume effect and giant magnetoresistance effect. Of all the metals, bismuth has the strongest diamagnetism, the smallest thermal conductivity (except mercury), and the largest Hall effect. The larger free path of carriers is conducive to the conduction of bismuth, while its own heavy ions (element 83) are conducive to scattering phonons, and the thermal conductivity is small, so bismuth is a very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/02C30B7/14B82Y40/00
Inventor 陈晓明霍开拓
Owner SHAANXI NORMAL UNIV
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