Method for preparing Bi2Te3 / carbon nano-tube composite material

A carbon nanotube and composite material technology, applied in the fields of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of long time required, complex chemical reaction, difficult control of the reaction system, etc., to improve thermoelectric performance and simple process. Effect

Inactive Publication Date: 2009-08-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-Bi synthesized by hydrothermal and solvothermal 2 Te 3 It takes a long time and the chemical reaction is complicated. In addition, the addition of carbon nanotubes will make the reaction system more difficult to control.

Method used

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  • Method for preparing Bi2Te3 / carbon nano-tube composite material
  • Method for preparing Bi2Te3 / carbon nano-tube composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Weigh a certain amount of Na 2 TeO 3 and Bi(NO 3 ) 3 ·5H 2 O, respectively dissolved in ethylene glycol to make 0.1875mmmol / l and 0.5mmol / l ethylene glycol solutions, according to Bi 2 Te 3 The mol ratio of Bi:Te determined by the chemical composition is 2:3, and 16.0ml Na 2 TeO 3 ethylene glycol solution and 4.0ml Bi(NO 3 ) 3 ·5H 2 O and ethylene glycol solution were mixed, mixed evenly and then transferred to the burette of the microwave reactor.

[0019] 2) Ultrasonic dispersion of 0.16 g of treated carbon nanotubes in ethylene glycol was transferred to a 100 ml three-neck round bottom flask, and the pH was adjusted to 13. The treatment method of carbon nanotubes is: put carbon nanotubes in concentrated nitric acid and heat them to 120°C, oxidize them for 3 hours, wash them with deionized water until neutral, remove impurities, and then ultrasonically disperse carbon nanotubes in concentrated ammonia water for 2 hours , and washed again to neutrality, p...

Embodiment 2

[0023] 1) Weigh a certain amount of TeO 2 and Bi(NO 3 ) 3 ·5H 2 O, respectively dissolved in ethylene glycol to make 0.1875mmmol / l and 0.5mmol / l ethylene glycol solutions, according to Bi 2 Te 3 The molar ratio of Bi:Te determined by the chemical composition is 2:3, and 16.0ml TeO 2 ethylene glycol solution and 4.0ml Bi(NO 3 ) 3 ·5H 2 O and ethylene glycol solution were mixed, mixed evenly and then transferred to the burette of the microwave reactor.

[0024] 2) Ultrasonic dispersion of 0.08 g of the treated carbon nanotubes in ethylene glycol was transferred to a 100 ml three-necked round bottom flask, and the pH was adjusted to 11. The treatment method of carbon nanotubes is: put carbon nanotubes in concentrated nitric acid and heat them to 120°C, oxidize them for 3 hours, wash them with deionized water until neutral, remove impurities, and then ultrasonically disperse carbon nanotubes in concentrated ammonia water for 2 hours , and washed again to neutrality, place...

Embodiment 3

[0028] 1) Weigh a certain amount of Te and BiCl 3 , respectively dissolved in ethylene glycol to make 0.1875mmmol / l and 0.5mmol / l ethylene glycol solutions, according to Bi 2 Te 3 The molar ratio of Bi:Te determined by the chemical composition is 2:3, the ethylene glycol solution of 16.0ml Te and 4.0ml BiCl 3 The ethylene glycol solution was mixed, mixed evenly and then transferred to the burette of the microwave reactor.

[0029]2) Ultrasonic dispersion of 1.6 g of treated carbon nanotubes in ethylene glycol was transferred to a 100 ml three-necked round bottom flask, and the pH was adjusted to 14. The treatment method of carbon nanotubes is: put carbon nanotubes in concentrated nitric acid and heat them to 120°C, oxidize them for 3 hours, wash them with deionized water until neutral, remove impurities, and then ultrasonically disperse carbon nanotubes in concentrated ammonia water for 2 hours , and washed again to neutrality, placed in a concentrated solution of EDTA and ...

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Abstract

The invention discloses a method for preparing Bi2Te3 carbon nano tube composite material, which adopts microwave polyol synthesis technique: 1) Bi element compound and Te element compound or Te elementary substance are respectively dissolved in glycol according to the mol ratio of Bi: Te determined by the chemical composition of Bi2Te3 and then stirred and mixed together; 2) ultrasonic dispersion is carried out on the processed carbon nano tube in the glycol, and the pH value is adjusted to be 11-14; 3) according to the mass ratio of 0.1:1-2:1 between the carbon nano tube and the Bi2Te3, the mixed solution in the step 1) is titrated in the solution of the step 2) for reaction at the temperature of 140-190 DEG C in a state of microwave radiation; after the reaction, the products are separated centrifugally and washed, and the solid products are collected and dried. The technique is simple and rapid, and the prepared Bi2Te3 carbon nano tube composite material can be used for improving the thermoelectric property of Bi2Te3-based thermoelectric material. Furthermore, the method can be widely applied to the fields such as physics, chemistry, micro-electronics, material, etc.

Description

technical field [0001] The present invention relates to Bi 2 Te 3 The invention relates to a preparation method of a carbon nanotube composite material, which belongs to the technical field of semiconductor thermoelectric materials. Background technique [0002] Thermoelectric materials (thermoelectric materials) are functional materials that can realize direct mutual conversion between thermal energy and electrical energy. Its devices have outstanding advantages such as small size, no noise, no pollution, no moving parts, and maintenance-free. The development and promotion of thermoelectric refrigeration and thermoelectric power generation technologies are of great value to energy utilization, economic development and environmental protection in my country and the world. [0003] Bi 2 Te 3 Compounds and their solid solution alloys are the earliest studied and one of the most mature thermoelectric materials. The ZT value (thermoelectric figure of merit) that characteri...

Claims

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Application Information

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IPC IPC(8): B82B3/00H01L35/34H01L35/14H01L35/16H01L35/18
Inventor 周丽娜张孝彬赵新兵朱铁军孙晨曦
Owner ZHEJIANG UNIV
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