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Plumbum telluride (PbTe) or graphene nanocomposite material and preparing method thereof

A nanocomposite material, graphene technology, applied in the field of PbTe/graphene nanocomposite material and its preparation, can solve problems such as gaps, and achieve the effects of low energy consumption, wide application prospect and simple process

Inactive Publication Date: 2012-07-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the ZT value of PbTe-based thermoelectric materials for commercial application is around 1, which is still far from the ZT value required for practical applications.

Method used

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  • Plumbum telluride (PbTe) or graphene nanocomposite material and preparing method thereof
  • Plumbum telluride (PbTe) or graphene nanocomposite material and preparing method thereof
  • Plumbum telluride (PbTe) or graphene nanocomposite material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of graphite oxide (GO):

[0049] 1) In the low temperature reaction stage, add 116ml of 98wt% concentrated sulfuric acid to a dry reaction vessel and cool it down to 0°C, add 5g of graphite powder and NaNO during stirring 3 2.5g, after mixing evenly, slowly add 15g of potassium permanganate, control the reaction temperature at 0-8°C, and stir for 1.5h;

[0050] 2) In the medium temperature reaction stage, place the above reaction vessel in a constant temperature water bath at 36°C and stir evenly for 30 minutes;

[0051] 3) In the high-temperature reaction stage, slowly add 250ml of warm water at 50-60°C and 30ml of hydrogen peroxide with a mass concentration of 30wt% into the container after the end of the medium temperature, and finish the reaction after stirring for 15 minutes. 4 2- (with BaCl 2 solution detection), and then freeze-dried to obtain graphite oxide.

[0052] (2) Preparation of composite materials:

[0053] 1) with Pb(CH 3 COO) 2 ...

Embodiment 2

[0061] (1) Preparation of graphite oxide (GO):

[0062] 1) In the low-temperature reaction stage, add 120ml of 98wt% concentrated sulfuric acid to a dry reaction vessel, cool to 4°C, add 5g of graphite powder and NaNO while stirring 3 1.5g, after mixing evenly, slowly add 17g of potassium permanganate, control the reaction temperature at 0-7°C, and stir for 2h;

[0063] 2) In the medium temperature reaction stage, place the above reaction vessel in a constant temperature water bath at 32°C and stir evenly for 30 minutes;

[0064] 3) In the high-temperature reaction stage, slowly add 200ml of warm water at 50-60°C and 20ml of hydrogen peroxide with a mass concentration of 30wt% into the container after the end of the medium temperature, and finish the reaction after stirring for 30 minutes. 4 2- (with BaCl 2 solution detection), and then freeze-dried to obtain graphite oxide.

[0065] (2) Preparation of composite materials:

[0066] 1) with Pb(CH 3 COO) 2 ·3H 2 O and T...

Embodiment 3

[0074] (1) Preparation of graphite oxide (GO):

[0075] 1) In the low temperature reaction stage, add 110ml of 98wt% concentrated sulfuric acid to a dry reaction vessel, cool to 4°C, add 5g of graphite powder and NaNO while stirring 3 3.5g, after mixing evenly, slowly add 20g of potassium permanganate, control the reaction temperature at 4-10°C, and stir for 1.5h;

[0076] 2) In the medium-temperature reaction stage, place the above-mentioned reaction vessel in a constant temperature water bath at 40°C, and stir evenly for 40 minutes;

[0077] 3) In the high-temperature reaction stage, slowly add 220ml of warm water at 50-60°C and 26ml of hydrogen peroxide with a mass concentration of 30wt% into the container after the end of the medium temperature, and finish the reaction after stirring for 20 minutes. 4 2- (with BaCl 2 solution detection), and then freeze-dried to obtain graphite oxide.

[0078] (2) Preparation of composite materials:

[0079] 1) with Pb(NO3 ) 2 and T...

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Abstract

The invention relates to a plumbum telluride (PbTe) or graphene nanocomposite material and a preparing method thereof. The plumbum telluride (PbTe) or graphene nanocomposite materiall is characterized by the following steps: using a compound of plumbum (Pb) and a compound of tellutide (Te) as raw materials, respectively dissolving the two compounds into deionized water according to the stoichimetric ratio of the plumbum telluride (PbTe), preparing a solution containing plumbum and a solution containing tellutide (Te) with same concentration from 0.01 mole per liter to 0.1mole per liter; dissolving graphite oxide into the deionized water, performing ultrasound for 0.5 hours to 2 hours, preparing a graphite oxide solution with a concentration from 0.5 milligram per mini liter to 2 milligrams per mini liter; adding the graphite oxide solution into the solution containing plumbum, performing ultrasound for 0.5 hours to 2 hours, adding the solution containing tellutide, adjusting potential of hydrogen (pH) to be 9 to 12 by adding strong alkali, adding reducing agent, sealing membrane, placing in warm water bath, reacting with stirring for 8 hours to 24 hours at the temperature between 60DEG C and 100DEG C, collecting products, washing by deioniaed water, drying, and obtaining the plumbum telluride (PbTe) or graphene nanocomposite material; and adding the graphite oxide at 1%-30% of the theoretical mass of the plumbum telluride (PbTe). The plumbum telluride (PbTe) or graphene nanocomposite material and thepreparing method thereof has the advantages of simple technology, low cost and the like and having small plumbum telluride (PbTe) particles with 20 nanometers to 60 nanometers and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a PbTe / graphene nanocomposite material and a preparation method thereof. Background technique [0002] Energy is the basis for human survival and development. However, with the reduction of non-renewable energy such as fossil energy and the increase of global energy demand, the energy crisis may become a major crisis in the 21st century. Finding and developing new energy materials has become a research hotspot for scientists around the world. In real life, there is a lot of wasted heat energy, such as exhaust heat from automobiles, exhaust heat from factory waste water, etc. Using thermoelectric materials, we can harness this thermal energy and turn it into a reusable source of energy. Therefore, thermoelectric materials, as a new energy material that utilizes the movement of carriers inside the material to achieve direct conversion of thermal energy a...

Claims

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Application Information

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IPC IPC(8): H01L35/16H01L35/14H01L35/34
Inventor 唐新峰董京杜李涵
Owner WUHAN UNIV OF TECH
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