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Preparation method of lead telluride nano crystal and micron crystal

A technology of nanocrystals and lead telluride, applied in chemical instruments and methods, binary selenium/tellurium compounds, single crystal growth, etc., can solve the problems of complex preparation methods and high costs, and achieve simple preparation methods, good crystallinity, The effect of high purity

Inactive Publication Date: 2009-12-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods are relatively complicated, and require some auxiliary equipment, and the cost is high

Method used

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  • Preparation method of lead telluride nano crystal and micron crystal
  • Preparation method of lead telluride nano crystal and micron crystal
  • Preparation method of lead telluride nano crystal and micron crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Weigh 9.7 grams of KOH and 10.3 grams of NaOH respectively and put them into a 50ml polytetrafluoroethylene container, then add 0.494 grams of Pb(NO 3 ) 2 and 0.239 g TeO 2 , after mixing evenly, seal the container with a cover; add 0.62 g of reducing agent KBH to another polytetrafluoroethylene container filled with the same quality of KOH and NaOH 4 , mix well and cover tightly.

[0023] 2) Preheat the above two containers in an oven at 180°C for 1.5 hours, and shake the reaction container for about 30 seconds every 20-30 minutes to promote the melting of the mixed alkali and disperse the reactants evenly in the mixed alkali melt in the liquid.

[0024] 3) Mix the reactants in the above two reaction vessels uniformly, and then make it continue to react for 45 minutes under a constant temperature state of 180°C.

[0025] 4) The reaction vessel was taken out from the oven, and naturally cooled to room temperature in air.

[0026] 5) Use hot deionized water to fu...

Embodiment 2

[0030] 1) Weigh 19.4 grams of KOH and 20.6 grams of NaOH respectively and put them into a 100ml polytetrafluoroethylene container, then add 0.494 grams of Pb(NO 3 ) 2 and 0.332 g Na 2 TeO 3 , after mixing evenly, seal the container with a cover; add 0.62 g of reducing agent KBH to another polytetrafluoroethylene container filled with the same quality of KOH and NaOH 4 , mix well and cover tightly.

[0031] 2) Preheat the above two containers in an oven at 180°C for 2 hours, and shake the reaction container for about 30 seconds every 20-30 minutes to promote the melting of the mixed alkali and disperse the reactants evenly in the mixed alkali melt in the liquid.

[0032] 3) Mix the reactants in the above two reaction vessels evenly, and then make it continue to react for 1 hour under a constant temperature state of 180°C.

[0033] 4) The reaction vessel was taken out from the oven, and naturally cooled to room temperature in air.

[0034] 5) Use hot deionized water to ful...

Embodiment 3

[0038] Step is the same as example 1, and difference is only that the reaction time in step 3) is 1.5 hours.

[0039] The resulting product morphology is quite different from Example 1. SEM observations showed that the products were mostly rod-like and flake-like nanocrystals ( figure 2 (b)). Transmission electron microscope observation shows that the product contains aggregates of nanoparticles, and contains a large number of rod-like and sheet-like nanostructures ( image 3 (b)).

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Abstract

The invention relates to a preparation method of lead telluride nano crystal and micron crystal, belonging to the thermoelectric material technical field. In the method, soluble lead salt and compound containing tellurium are taken as raw materials, borohydride of alkali metal is taken as reducing agent, mixed hydroxides are adopted as reaction medium, and reaction is carried out for 0.5-12h at 170-200 DEG C at normal atmosphere, thus obtaining the PbTe nano crystal and micron crystal. The preparation method related in the invention has the characteristics of simple device and process, low cost and high reaction speed and is easy for industrialized production. The invention can obtain nano and micron PbTe products in different appearances by simply controlling reaction time. The obtained product has good crystallinity, and the surface is clean and smoother, thus having potential application value in preparation of nano and micro thermoelectric devices.

Description

technical field [0001] The invention relates to the preparation of semiconductor thermoelectric materials, and relates to the preparation method of lead telluride nano crystals and micro crystals. Background technique [0002] With the increasingly prominent environmental and energy issues, the development of environmentally friendly clean new energy has attracted great attention from the scientific and engineering circles of various countries. Thermoelectric materials are a new class of functional materials that utilize the Seebeck effect and the Peltier effect to convert heat and electricity into each other. The application of thermoelectric devices does not require the use of transmission parts, and there is no noise, no waste during operation, and no pollution to the environment. Moreover, this material has reliable performance and long service life. It is an environmentally friendly material with wide application prospects. At present, thermoelectric materials have bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04C30B29/46
Inventor 蔡克峰李晖
Owner TONGJI UNIV
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