PbTe cubic particle/grapheme composite material and preparation method and application thereof

A technology of cubic particles and composite materials, used in thermoelectric devices with thermal changes in dielectric constant, etc., can solve the problems of inability to reflect the advantages of nanomaterials, easy agglomeration of nanocrystalline particles, weakening of phonon scattering, etc., to promote effective scattering, improve Thermoelectric performance, low cost effect

Inactive Publication Date: 2012-10-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanocrystalline grains are easy to agglomerate and sinter during heat treatment, thus weakening the scattering of phonons, which cannot reflect the advantages of nanomaterials

Method used

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  • PbTe cubic particle/grapheme composite material and preparation method and application thereof
  • PbTe cubic particle/grapheme composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) The analytically pure PbCl 2 And Te powder, according to the proportion of Pb:Te atomic ratio 1:1, mix in absolute ethanol, make the mixed solution that the concentration of PbTe is 0.015mol / L, the mixed solution volume is 80 milliliters.

[0033] 2) Add 20 mg of GO to the mixture in step 1) and fully ultrasonically disperse it, then place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and then add 0.5 g of reducing agent NaBH to the solution 4 , and then add 6M NaOH aqueous solution to adjust the pH value to 10, and then seal it immediately.

[0034] 3) Heating the reactor to 180°C and reacting for 24 hours.

[0035] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a composite material powd...

Embodiment 2

[0038] 1) Analytical pure Pb(NO 3 ) 2 and Na 2TeO 3 , according to the proportion of Pb:Te atomic ratio of 1:1 and then mixed in deionized water to prepare a mixed solution with a concentration of 0.03 mol / L in terms of PbTe, and the volume of the mixed solution was 80 ml.

[0039] 2) Add 24 mg of GO to the mixture in step 1) and fully ultrasonically disperse it, then place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 2.3 g of reducing agent KBH to the solution 4 , and then add 6M KOH aqueous solution to adjust the pH value to 11, and then seal it immediately.

[0040] 3) Heating the reactor to 140°C and reacting for 48 hours.

[0041] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a co...

Embodiment 3

[0044] 1) will analyze pure PbSO 4 and K 2 TeO 3 According to the ratio of Pb:Te atomic ratio of 1:1, mix in anhydrous ethylene glycol to prepare a mixed solution with a concentration of 0.09 mol / L in terms of PbTe, and the volume of the mixed solution is 80 ml.

[0045] 2) Add 24 mg of GO to the mixture in step 1) and fully ultrasonically disperse it, then place it in a high-pressure reactor with a capacity of 100 ml (filling degree 80%, volume percentage), and add 3 grams of reducing agent NaBH to the solution 4 , then add 6M NaOH aqueous solution to adjust the pH value to 11 and seal immediately.

[0046] 3) Heating the reactor to 220°C and reacting for 36 hours.

[0047] 4) Naturally cool to room temperature after the reaction, collect the powdery reaction product at the bottom of the kettle, wash it with deionized water and absolute ethanol alternately and repeatedly for several times, then vacuum dry the powder at 110°C for 12 hours to obtain a composite material powd...

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Abstract

The invention discloses a PbTe cubic particle/grapheme composite material consisting of nano PbTe cubic particles and graphene. Owing to the dispersing, bearing and isolating functions of the graphene, the PbTe nano particles are effectively prevented from sintering in the heat treatment process, so that the grain boundary can effectively scattering phonon, and great significance on improving the thermoelectric property of the PbTe material is achieved. The composite material can serve as a thermoelectric material. The invention also discloses a preparation method of the composite material by adopting a one-step hydrothermal method or a one-step solvothermal method, and the preparation method has the advantages of simple process, low cost, short period, low energy consumption and the like.

Description

technical field [0001] The invention relates to the field of thermoelectric composite materials, in particular to a PbTe cubic particle / graphene composite material and a preparation method and application thereof. Background technique [0002] A thermoelectric material is a semiconductor material that directly converts electrical energy and thermal energy through the movement of carriers (electrons or holes). When there is a temperature difference between the two ends of the thermoelectric material, the thermoelectric material can convert heat energy into electrical energy output; or conversely, when a current is passed through the thermoelectric material, the thermoelectric material can convert electrical energy into heat energy, absorbing heat at one end and releasing heat at the other end. Thermoelectric materials have broad application prospects in the fields of power generation or refrigeration. Thermoelectric power generation devices using thermoelectric materials can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L37/02
Inventor 谢健屠芳芳刘双宇朱铁军曹高劭赵新兵
Owner ZHEJIANG UNIV
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