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Component-controllable Bi-Te-Se ternary nanowire and preparation method thereof

A nanowire and te-se technology, which is applied in the field of Bi-Te-Se ternary nanowires with controllable components and their preparation, can solve the problem that bismuth telluride is difficult to meet the needs of commercial applications, and achieve potential application value. , the effect of stable structure and simple preparation process

Pending Publication Date: 2021-10-29
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, to provide a Bi-Te-Se ternary nanowire with controllable composition and its preparation method, to solve the problem that bismuth telluride in the prior art is difficult to meet the existing commercial requirements. Technical issues related to application requirements

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  • Component-controllable Bi-Te-Se ternary nanowire and preparation method thereof
  • Component-controllable Bi-Te-Se ternary nanowire and preparation method thereof
  • Component-controllable Bi-Te-Se ternary nanowire and preparation method thereof

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preparation example Construction

[0036] Step 1. Preparation of Te nanowires: First, mix and dissolve 1.5mmol of tellurium oxide, 0.75g of polyvinylpyrrolidone and 10mmol of potassium hydroxide in 30mL of ethylene glycol, use magnetic stirring to make it evenly mixed, and then mix The solution was poured into a three-necked bottle, and under the conditions of nitrogen protection, circulating water cooling and magnetic stirring, the mixed solution was heated to 140°C, and 4 mL of hydrazine hydrate with a concentration of 85% was quickly injected. For solution A of elemental nanowires, lower the temperature of the solution to 90°C for use;

[0037] The preparation of step 2.Te-Se nanowires: (0.17-1.5)mmol selenous acid, the concentrated hydrochloric acid of (2.5-5)mL and (0.5-1)g polyvinylpyrrolidone that concentration is 18mol / L are dissolved in 10mL of ethylene glycol, and use magnetic stirring for 3–5min to make it evenly mixed. Then it is injected into the Te nanowire solution at 90°C in step 1 through a sy...

Embodiment 1

[0040] First, 0.2394g (1.5mmol) of TeO 2, 0.75g PVP and 5.6g (10mmol) KOH, mixed and dissolved in 30ml EG at room temperature, and fully dissolved into a transparent liquid by magnetic stirring. Then pour it into a 100ml three-neck bottle, under the conditions of nitrogen protection, circulating water cooling and magnetic stirring, heat the mixed solution to 140°C, quickly inject 4ml of hydrazine hydrate through a syringe, and keep it warm for 1 hour to obtain Te solution of nanowires. Lower the temperature of the solution to 90°C for use;

[0041] 0.0215g (0.17mmol) selenous acid (H 2 SeO 3 , 99.99%), 2.5ml of concentrated hydrochloric acid (HCl, 18mol / L) and 0.5g of PVP were dissolved in 10mL of ethylene glycol, and the solution was magnetically stirred at room temperature for 3-5min until the solute was completely dissolved and the solution appeared colorless Transparent, it is injected into the tellurium nanotube solution at a temperature of 90°C, then the temperature ...

Embodiment 2

[0048] First, 0.2394g (1.5mmol) of TeO 2 , 0.75g PVP and 5.6g (10mmol) KOH were mixed and dissolved in 30mL EG at room temperature, and fully dissolved into a transparent liquid by magnetic stirring. Then pour it into a 100ml three-necked bottle, under the conditions of nitrogen protection, circulating water cooling and magnetic stirring, heat the mixed solution to 140°C, quickly inject 4mL of hydrazine hydrate through a syringe, and keep warm for 1 hour to obtain Te For the solution A of the nanowires, the temperature of the solution is lowered to 90°C for use;

[0049] 0.0323g (0.25mmol) selenous acid (H 2 SeO 3 , 99.99%), 3ml of concentrated hydrochloric acid (HCl, 18mol / L) and 0.6g of PVP were dissolved in 10ml of ethylene glycol, and the solution was magnetically stirred at room temperature for 3-5min until the solute was completely dissolved and the solution appeared colorless and transparent shape, inject it into a solution of tellurium nanotubes at a temperature of ...

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Abstract

The invention provides a component-controllable Bi-Te-Se ternary nanowire and a preparation method thereof. According to the method, firstly, a solution containing a Te elementary substance nanowire is prepared, then, a solution of a Te-Se nanowire is prepared on the basis, finally, the Te-Se nanowire is doped with a Bi element. According to the method, the scattering effect of defects on phonons is enhanced through low dimension and multiple components, the lattice thermal conductivity of the material is reduced, and the thermoelectric performance of the material is improved. The preparation process is simple, the operation process is safe and pollution-free, and the obtained nanowire is uniform in element distribution and stable in structure and has potential application value in the field of thermoelectric materials.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a Bi-Te-Se ternary nanowire with controllable components and a preparation method thereof. Background technique [0002] Thermoelectric conversion technology can utilize the intrinsic electrical / heat transfer characteristics of materials to realize mutual conversion between thermal energy and electrical energy. This technology has the advantages of no pollution, no noise, long life and high reliability. It is an ideal green and environmentally friendly all-solid-state energy utilization method. However, the current thermoelectric technology still has the problem of low conversion efficiency. [0003] The energy conversion rate of thermoelectric materials is mainly determined by the dimensionless thermoelectric figure of merit ZT of the material, and its expression is: ZT=(α 2 σ / κ)·T, where T is the temperature, σ, α, and κ represent the electrical conductivity...

Claims

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Application Information

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IPC IPC(8): C01B19/00B82Y40/00
CPCC01B19/007B82Y40/00C01P2004/16C01P2004/04C01P2002/72C01P2004/03C01P2002/85C01P2006/32
Inventor 刘帅刘迎港陈国祥
Owner XI'AN PETROLEUM UNIVERSITY
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