SiO2 nanoparticle composite cage compound thermoelectric material and preparation method thereof

A cage compound and nanoparticle technology, which is applied in the direction of thermoelectric device node lead wire materials, thermoelectric device manufacturing/processing, etc., can solve the problems of easy agglomeration and difficult dispersion of composite particles, so as to improve thermoelectric performance and simple preparation method Ease of operation and reduction in electrical transport performance

Active Publication Date: 2011-02-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide SiO 2 Nanoparticle composite cage compound thermoelectric material and preparation method thereof, SiO 2 Nanoparticles are compounded into the cage compound to optimize its thermoelectric properties, while overcoming the disadvantages of easy introduction of other impurities during the preparation process, and the difficulty of dispersion and agglomeration of composite particles

Method used

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  • SiO2 nanoparticle composite cage compound thermoelectric material and preparation method thereof
  • SiO2 nanoparticle composite cage compound thermoelectric material and preparation method thereof
  • SiO2 nanoparticle composite cage compound thermoelectric material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] Tetraethyl orthosilicate Si(OC 2 h 5 ) 4 Dissolve in absolute ethanol to configure tetraethyl orthosilicate alcohol solution with a volume percentage of 5%; mix absolute ethanol and distilled water to configure an ethanol solution with a concentration of 75%, and dissolve a 25% analytically pure ammonia solution with a concentration of In this ethanol solution, configure ammonia solution II with a volume percentage of 1%; after stirring for 30 minutes, use a peristaltic pump to slowly drop solution I into solution II at a rate of 1.25 ml / min to obtain a suspension; continue stirring the After 5 hours of suspension, it was sedimented for 10 hours, then centrifuged, followed by vacuum drying at 60°C for 5 hours, and then vacuum drying at 120°C for 5 hours to obtain SiO 2 Powder particles.

[0033] The SiO was observed using a SEM, field emission scanning electron microscope 2 Powder particles, obtained as figure 1 As shown in the SEM picture, it can be seen that the ...

Embodiment 2

[0038] 2.79ml tetraethyl orthosilicate Si(OC 2 h 5 ) 4 Dissolved in 22.2ml of absolute ethanol, the configuration volume percentage is 11.1% tetraethyl orthosilicate alcohol solution 1; the concentration is 25% analytical pure ammonia solution mixed with 6.8ml water and 17.6ml of absolute ethanol, the configuration volume percentage is 2.5% ammonia solution II; after stirring for 30 minutes respectively, use a peristaltic pump to slowly drop solution I into solution II at a rate of 1.25 ml / min to obtain a suspension; continue to stir the suspension for 5 hours and settle it 10 h, followed by centrifugation, followed by vacuum drying at 60 °C for 5 h, followed by vacuum drying at 120 °C for 5 h to obtain SiO 2 Powder particles.

[0039] Observe the SiO using SEM 2 powder particles, to obtain similar figure 1 The SEM picture shown, indicates that the SiO 2 The particle size of the powder particles is nanoscale, specifically 50nm-200nm.

[0040] Weigh 3 grams of type I cag...

Embodiment 3

[0043] Tetraethyl orthosilicate Si(OC 2 h 5 ) 4 Dissolve in absolute ethanol to configure tetraethyl orthosilicate alcohol solution 1 with a volume percentage of 5%; mix absolute ethanol and distilled water to configure an ethanol solution with a concentration of 80%, and dissolve a 25% analytically pure ammonia solution with a concentration of Configure volume percent in this ethanol solution and be 5% ammonia solution two, take 4g Ba simultaneously 8 Ga 16 Ge 30 Put the powder in 25ml solution 2; after stirring for 30 minutes, use a peristaltic pump to slowly drop 3ml solution 1 into solution 2 at a rate of 1.0 ml / min to obtain SiO 2 The clathrate compound suspension composed of particles; continue to stir the suspension for 5 hours, then settle it for 10 hours, then centrifuge, and then dry it in vacuum at 60°C for 5 hours to obtain SiO 2 Particle Composite Ba 8 Ga 16 Ge 30 Powder: The target powder is subjected to hot-press sintering. The specific hot-press sinteri...

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Abstract

The invention relates to the technical field of thermoelectric materials and discloses a SiO2 nanoparticle composite cage compound thermoelectric material and a preparation method thereof. In the invention, 50 to 300 nanometer SiO2 nanoparticles are mixed with a cage compound, the regulation of the electron transport performance of the cage compound thermoelectric material and the considerable reduction of lattice thermal conductivity are realized by adding a proper amount of the SiO2 nanoparticles, and finally the hermoelectric property of the cage compound thermoelectric material is improved. In addition, the preparation method of the SiO2 nanoparticle composite cage compound thermoelectric material is simple and easy to implement, overcomes the drawbacks of introducing other impurities easily and preventing the mixed second-phase particles from dispersing and agglomeration easily of the traditional preparation method, and makes the nano SiO2 particles uniformly dispersed and mixed with the cage compound thermoelectric material.

Description

technical field [0001] The invention relates to the technical field of thermoelectric materials, in particular to SiO 2 Nano particle composite cage compound thermoelectric material and preparation method thereof. Background technique [0002] Due to the increasingly serious problems of fossil energy shortage and environmental pollution, thermoelectric conversion technology has attracted more and more attention. Thermoelectric power generation and thermoelectric refrigeration have broad application prospects in the reuse of low-quality industrial waste heat, such as industrial production, transportation, waste incineration, etc., as well as special power supplies in space. [0003] The thermoelectric conversion system has the characteristics of no transmission parts, no noise, small system volume, and no emission of pollutants. It is a kind of green system that conforms to the concept of "low-carbon economy". = S 2 σT / κ, where S is the Seebeck coefficient, σ is the electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/14C22C1/05H01L35/34
Inventor 蒋俊陈建敏张婷吴敬华石文杰熊震李炜许高杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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