CN201156550Y - Nano pyroelectric material of coaxial cable construction - Google Patents

Abstract

The utility model relates to a thermoelectric material. The common thermoelectric material has the low thermoelectric conversion efficiency. The thermoelectric nanometer material with the coaxial cable structure of the utility model comprises a line-shaped nanometer inner core and a casing covering at the outside of the nanometer inner core. The nanometer inner core and the casing are tightly matched and positioned coaxially. The nanometer inner core and the casing adopt the different thermoelectric materials. The thermoelectric nanometer material with the coaxial cable structure of the utility model has the inner core and the casing which are made of the thermoelectric material. Compared with the thermoelectric material with the traditional structure, due to the unique microscopic structure and the increased interfacial area, the coaxial cable structure can remarkably strengthen the phonon transmission, decrease the heat transfer coefficient of the thermoelectric material, and promote the thermoelectric figure of merit, thereby increasing the thermoelectric conversion efficiency of material.

Description

A kind of nano thermal electric material with coaxial cable structure

Technical field

The utility model belongs to the semi-conductor thermoelectric material technical field, relates to thermoelectric material, and concrete is a kind of nano thermal electric material with coaxial cable structure.

Background technology

Thermoelectric material is that a kind of solid interior carrier moving that utilizes is realized the functional material that heat energy and electric energy are directly changed mutually, promptly utilize the Seebeck effect to realize that heat energy is directly changed into electric energy, utilize the Peltier effect to make the transfer of heat from the low-temperature end to the temperature end realize refrigeration on the contrary.Nos drive disk assembly, no dry sound move, excellent properties such as pollution-free, accurate reliable owing to have, the thermoelectric conversion device that is made up by thermoelectric material is desirable power supply and refrigerator, is widely used in oneself in many fields such as people's stone petrochemical industry, detecting instrument, Aero-Space, household electrical appliance.

Compare with traditional refrigerator or generator, the conversion efficiency of thermoelectric of thermoelectric material is on the low side (less than 10%), and this also is the maximum bottleneck of thermoelectric material development.The conversion efficiency of thermoelectric of thermoelectric material depends on nondimensional thermoelectric figure of merit ZT:ZT=S ²σ T/K, S are the Seebeck coefficient, and T is an absolute temperature, and σ is a conductivity, and K is a thermal conductivity.The thermoelectric figure of merit ZT of traditional hot electric material is all less than 1.All the time, scientists is attempted the thermoelectric figure of merit that various new approach improves thermoelectric material, solves low this long-term puzzled problem of conversion efficiency of thermoelectric, and the thermoelectric material that wherein develops new structure is important means.

Summary of the invention

The purpose of this utility model just provides a kind of thermoelectric material of new structure, can effectively solve low this problem of conversion efficiency of thermoelectric.

Nano thermal electric material with coaxial cable structure of the present utility model comprises wire nanometer inner core and is coated on the outer overcoat of nanometer inner core that nanometer inner core and overcoat closely cooperate, coaxial setting; The nanometer inner core adopts different thermoelectric materials with overcoat.

The material of described nanometer inner core is Sb ₂Te ₃Or Bi ₂Te ₃, and the thermoelectric material that replaces or partly replace Sb, Bi and Te with Sn, Se, Pb, Zn, Co, Fe.

The material of described overcoat is Sb ₂Te ₃Or Bi ₂Te ₃, and the thermoelectric material that replaces or partly replace Sb, Bi and Te with Sn, Se, Pb, Zn, Co, Fe.

Nano thermal electric material with coaxial cable structure of the present utility model, wherein inner core and overcoat are thermoelectric material.Thermoelectric material with respect to traditional structure, the coaxial cable structure thermoelectric material is owing to its unique microstructure, and the interfacial area increase, can significantly strengthen phonon and transport the thermal transmission coefficient that reduces thermoelectric material, improve thermoelectric figure of merit, thereby improve the conversion efficiency of thermoelectric of material.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

As shown in Figure 1, nano thermal electric material with coaxial cable structure comprises traditional thread binding nanometer inner core 1 and the overcoat 2 that is coated on outside the nanometer inner core 1, and nanometer inner core 1 and overcoat 2 closely cooperate, coaxial setting; Nanometer inner core 1 adopts different thermoelectric materials with overcoat 2.

The material of nanometer inner core 1 is Sb ₂Te ₃Or Bi ₂Te ₃, and the thermoelectric material that replaces or partly replace Sb, Bi and Te with Sn, Se, Pb, Zn, Co, Fe.

The material of overcoat 2 is Sb ₂Te ₃Or Bi ₂Te ₃, and the thermoelectric material that replaces or partly replace Sb, Bi and Te with Sn, Se, Pb, Zn, Co, Fe.

The concrete grammar for preparing this structure nano pyroelectric material is:

A. with in two or more adding reaction vessel in soluble-salt, tellurium powder and the selenium powder of Bi, Sb, Zn, Pb, Co, Fe, Sn, add distilled water, potassium borohydride, NaOH and surfactant then to neopelex, under 50 ℃～100 ℃ conditions, reacted 12～48 hours, make the nanometer inner core of coaxial cable structure thermoelectric material;

B. the nanometer inner core of gained is successively also dry with ethanol and distilled water washing, dried nanometer inner core is dispersed in the solvent, normal temperature stirs down and carries out surface treatment behind the adding surface treatment auxiliary agent;

C. will add in the autoclave through the nanometer inner core after the surface treatment, again with in two or more adding reaction vessel in soluble-salt, tellurium powder and the selenium powder of Bi, Sb, Zn, Pb, Co, Fe, Sn, add potassium borohydride and NaOH then, add distilled water to 70%～90% of reactor volume, under 120 ℃～200 ℃ conditions, reacted 12～48 hours, obtain nano thermal electric material with coaxial cable structure.

Wherein the soluble-salt of Bi, the Sb among step a and the c, Zn, Pb, Co, Fe, Sn is nitrate, sulfate or chloride.

Wherein the solvent among the step b is one or more the mixture in water, methyl alcohol, ethanol, acetone, the toluene.The surface treatment auxiliary agent be an end have-SH group, the other end have-functional compounds of COOH group, its concentration is 0.1wt%～20wt%.The end group of these functional compounds surface treatment auxiliary agents can carry out complexing with elements such as the inner core of thermoelectric material and the bismuth in the overcoat, antimony, zinc, lead, cobalt, iron, tin, thereby realizes being connected of inner core and overcoat.

Claims (1)

1, a kind of nano thermal electric material with coaxial cable structure comprises wire nanometer inner core and is coated on the outer overcoat of nanometer inner core, it is characterized in that nanometer inner core and overcoat closely cooperate, coaxial setting; The nanometer inner core adopts different thermoelectric materials with overcoat;

The material of described nanometer inner core is Sb ₂Te ₃Or Bi ₂Te ₃, and the thermoelectric material that replaces or partly replace Sb, Bi and Te with Sn, Se, Pb, Zn, Co, Fe;

The material of described overcoat is Sb ₂Te ₃Or Bi ₂Te ₃, and the thermoelectric material that replaces or partly replace Sb, Bi and Te with Sn, Se, Pb, Zn, Co, Fe.

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