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Te/Bi or Te/Bi2Te3 nucleocapsid heterojunction structure nanometer wire and method for preparing same

A nanowire and heterojunction technology, applied in the field of thermoelectric materials and its preparation, to achieve the effect of complicated operation and high cost

Inactive Publication Date: 2008-11-26
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, nothing about thermoelectric materials Bi and Bi 2 Te 3 Related reports on the one-dimensional core-shell heterojunction structure and its preparation technology

Method used

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  • Te/Bi or Te/Bi2Te3 nucleocapsid heterojunction structure nanometer wire and method for preparing same
  • Te/Bi or Te/Bi2Te3 nucleocapsid heterojunction structure nanometer wire and method for preparing same
  • Te/Bi or Te/Bi2Te3 nucleocapsid heterojunction structure nanometer wire and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: Synthesis of Te / Bi core-shell heterostructure nanowires

[0035] 1) Synthesis of single crystal Te nanowires

[0036] 0.6 g polyvinylpyrrolidone (PVP) 0.48 g TeO 2 Disperse the powder in 50 ml of ethylene glycol, heat until the solution is clear, transfer the prepared solution to a three-necked flask with a capacity of 250 ml, and increase the temperature to 150 degrees Celsius; add 0.5-1 ml of hydrazine hydrate at this temperature, Te nanowire colloidal solution (named as intermediate product 1) can be obtained after reacting for 20 minutes at 100°C; after natural cooling, the reaction product solution is taken out, the product is separated by centrifugation, and the product is washed with distilled water and absolute ethanol for 3 times, Te nanowire samples were obtained.

[0037] The morphology and microstructure of the samples were observed by Hitachi H-800 transmission electron microscope (TEM) and JEOL-2010 high-resolution transmission electron micros...

Embodiment 2

[0050] Example 2: Te / Bi 2 Te 3 Synthesis of Core-Shell Heterostructure Nanowires

[0051] 1) Synthesis of elemental Te single crystal nanowires

[0052] The preparation method is the same as Step 1 in Example 1. The difference is that the TeO added in this example 2 The amount of the powder was 0.2394 g; the obtained Te nanowire solution was named as the intermediate product 1 of Example 2.

[0053] 2) Te / Bi 2 Te 3 Synthesis of Core-Shell Heterostructure Nanowires

[0054] 0.3 g of PVP, 0.485 g of Bi(NO 3 ) 3 ·5H 2 O powder, 0.135 g H 2 C 2 o 4 powder and 0.2394 g TeO 2 Disperse the powder in 25 ml of ethylene glycol, stir until a uniform white milky turbid solution is formed, named Bi-Te precursor solution; after ultrasonically dispersing the white milky turbid solution for 10-20 minutes, pour it into the solution at 150 degrees Celsius In Example 2, the intermediate product 1 was incubated for 40 minutes to obtain Te / Bi 2 Te 3 The colloidal solution of the pr...

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Abstract

The invention relates to a core-shell heterojunction structure nano-wire of Te / Bi or a Te / Bi2Te3 and a preparation method thereof. The nano-wire is characterized in that the preparation method applies liquid phase epitaxial method with glycol as solvent, PVP as an organic additive and a Te nano-wire as an in-situ template to synthesize the Te / Bi and the Te / Bi2Te3 core-shell heterojunction structure nano-wires; the nano-wire grows along the direction of and lt;001andgt;, and takes simple substance Te single crystal nano-wire with a hexagonal structure as core material, and has single crystal coating material formed by the extension of simple substance Bi with a hexagonal structure and alloy Bi2Te3; the extension relation between the simple substance and the alloy is as follows: Te(100) crystal plane is parallel to Bi(100) crystal plane or Bi2Te3 (100) crystal plane, and Te and lt;001 and gt; direction axis is parallel to Bi and lt;001and gt; direction axis or Bi2Te3 and lt;001and gt; direction axis. The heterojunction structure nano-wire of the invention can improve the thermoelectric properties of materials and quicken the application of thermoelectric materials.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials and their preparation, in particular to Te / Bi and Te / Bi 2 Te 3 Core-shell heterostructure nanowire and its preparation method. Background technique [0002] Since the discovery of the thermoelectric effect by German physicist Seebeck in 1823, thermoelectric materials have attracted much attention as an important energy material. At present, the biggest challenge in the field of thermoelectric materials is how to improve the thermoelectric properties of materials, so as to realize the popularization and application of thermoelectric materials and solve the energy crisis. American Chemical Society "Nano Letters" (Nano Letters, 2005, Vol. 5, No. 6, pp. 1111-1115) and American Physical Union "Applied Physics Letters" (Applied Physics Letters, 2006, No. 89, Page 063121) successively reported through theoretical calculations that one-dimensional heterojunction nanomaterials with a co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B29/62
Inventor 章根强汪伟李晓光
Owner UNIV OF SCI & TECH OF CHINA
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