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Preparation method of pH-regulated bismuth telluride nanowire

A technology of bismuth telluride nanometer and bismuth chloride, which is applied in the direction of nanotechnology, binary selenium/tellurium compound, metal selenide/telluride, etc., can solve the problems of poor stability, complicated preparation process, and low product purity, and achieve High stability, high purity, good dispersion effect

Active Publication Date: 2021-11-26
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the present Bi2Te3 nano material preparation process complex, low product purity , poor stability, etc., a method for preparing bismuth telluride nanowires with pH control is provided. In the synthesis process of this method, Bi2 with high stability is prepared through pH control without any shape modifier sub>Te3 nanomaterials

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  • Preparation method of pH-regulated bismuth telluride nanowire
  • Preparation method of pH-regulated bismuth telluride nanowire
  • Preparation method of pH-regulated bismuth telluride nanowire

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specific Embodiment approach 1

[0025] Specific embodiment 1: This embodiment records a method for preparing pH-regulated bismuth telluride nanowires. The method includes the following steps:

[0026] Step 1, using bismuth chloride and potassium tellurite respectively as Bi 2 Te 3 For the Bi and Te sources of nanowires, add deionized water as a solvent (the amount of deionized water added is regulated by the filling degree of the reactor volume), stir for 10 to 30 minutes, mix well, add glucose reducing agent, and prepare The mixed solution was stirred at room temperature for subsequent use;

[0027]The present invention uses deionized water as a solvent and glucose as a reducing agent. Organic substances such as ethylene glycol are not used as solvents, which reduces production costs, simplifies the post-treatment process of products, and reduces the impact on the environment. At the same time, relatively cheap glucose is used as a weak reducing agent, which is more friendly to the human body and the env...

specific Embodiment approach 2

[0032] Specific embodiment 2: A pH-regulated bismuth telluride nanowire preparation method described in specific embodiment 1. In step 1, the molar ratio of the Bi source to the Te source is 2:3, and the Bi source and the glucose reduction The molar ratio of the agent is 0.2:1~5mmol, and the precise control of the stoichiometric ratio of the reaction from the precursor of bismuth telluride can effectively avoid the occurrence of many side reactions under high temperature and high pressure environment, improve the utilization rate of raw materials, and at the same time can Improve sample purity.

specific Embodiment approach 3

[0033] Specific embodiment three: a kind of pH regulation and control bismuth telluride nanowire preparation method described in specific embodiment one, in step two, the regulation and control of the pH of precursor solution is to add acid liquid, and described acid liquid is HCl or H 2 SO 4 , and its concentration can be configured according to requirements. These acids are commonly used acids in industry, and are easy to obtain and cheap.

[0034] Embodiment 4: In Embodiment 1, a method for preparing bismuth telluride nanowires with pH control, in step 3, the filling degree of the reactor is 50% to 80%, the reaction temperature is 150 to 200°C, and the reaction time is 16~32h. Using hydrothermal reaction, the reproducibility of the experiment is good, and the business of mass production in industry can be realized. The filling degree is set to 50%-80%, and the bismuth telluride nanowire sample can be obtained. A filling degree lower than 50% cannot form a closed critica...

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Abstract

The invention discloses a preparation method of a pH-regulated bismuth telluride nanowire, and belongs to the technical field of morphological regulation of functional nano materials. The method comprises the following steps: taking bismuth chloride and potassium tellurite as a Bi source and a Te source of a Bi2Te3 nanowire, adding deionized water, stirring for 10-30 minutes, fully and uniformly mixing, adding glucose, and stirring at room temperature for later use; under the conditions of stirring and cold bath, dropwise adding an acid solution to control the pH value of the solution to be 0-6; placing the solution in a polytetrafluoroethylene lining, placing the lining in a stainless steel reaction kettle, tightening and sealing the reaction kettle, and then placing the reaction kettle in a drying oven for heating; after the reaction is finished, naturally cooling to room temperature, putting a product into a centrifugal tube, adding an ethanol solution, then centrifuging, collecting a lower-layer precipitate sample, washing for multiple times, and finally drying. The Bi2Te3 nanowire product disclosed by the invention is good in dispersity, high in stability and high in purity. The whole synthesis method is green, environment-friendly, relatively simple, mild in reaction condition, good in safety and reliability, cheap and easily available in raw materials and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of shape regulation of functional nanomaterials, and in particular relates to a preparation method of pH regulation bismuth telluride nanowires. Background technique [0002] One-dimensional nanomaterials are considered ideal materials for directional electron transport because of their orientation characteristics along a certain direction. They are the smallest dimensional structures that can be used for the effective transport of electrons and photoexcitons, such as field effect transistors, resonant tunnel diodes, etc. nanoelectronic devices. One-dimensional nanostructures have become a research hotspot due to the integration of good electrical, optical and chemical properties, and have been widely used in various fields. [0003] As a typical semiconductor material, bismuth telluride (Bi 2 Te 3 ) have attracted much attention due to their excellent thermoelectric properties. Compared with other semic...

Claims

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Application Information

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IPC IPC(8): C01B19/04B82Y40/00
CPCC01B19/007B82Y40/00C01P2004/16C01P2004/03C01P2002/85C01P2002/72
Inventor 王金忠赵晨晨王东博
Owner HARBIN INST OF TECH