CN201156551Y

CN201156551Y - Nano pyroelectric material of core-shell construction

Info

Publication number: CN201156551Y
Application number: CNU2008200836189U
Authority: CN
Inventors: 聂秋林
Original assignee: Hangzhou Electronic Science and Technology University
Current assignee: Hangzhou Dianzi University; Hangzhou Electronic Science and Technology University
Priority date: 2008-02-26
Filing date: 2008-02-26
Publication date: 2008-11-26
Anticipated expiration: 2018-02-26

Abstract

The utility model relates to a thermoelectric nanometer material with core-shell structure. The common thermoelectric material has the low thermoelectric conversion efficiency. The thermoelectric nanometer material with core-shell structure comprises a spherical-shaped nanometer core and a shell covering at the outside of the nanometer core. The nanometer core and the shell are concentrically and tightly coordinated. The nanometer core and the shell adopt the different thermoelectric materials. The thermoelectric nanometer material with core-shell structure of the utility model has the nanometer core and the shell which are made of the thermoelectric material. Compared with the thermoelectric material with the traditional structure, the utility model 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 pyroelectric material of nucleocapsid 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 pyroelectric material of nucleocapsid 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.

The utility model comprises spherical nano inner core and is coated on the outer shell of nano inner core that nano inner core and shell closely cooperate with one heart, nano inner core and the different thermoelectric material of shell employing.

The material of described nano 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 shell 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 nano pyroelectric material of nucleocapsid structure of the present utility model, wherein nano inner core and shell are thermoelectric material.With respect to the thermoelectric material of traditional structure, the utility model can significantly strengthen phonon and transport the thermal transmission coefficient that reduces thermoelectric material, improves thermoelectric figure of merit, thereby improves the conversion efficiency of thermoelectric of material.

Description of drawings

Fig. 1 is the structural representation of the utility model core-shell structure nano pyroelectric material.

Embodiment

As shown in Figure 1, core-shell structure nano pyroelectric material comprises spherical nano inner core 1 and is coated on the outer shell 2 of nano inner core that nano inner core 1 and shell 2 closely cooperate with one heart, nano inner core 1 and the different thermoelectric material of shell 2 employings.

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

The material of shell 2 is Sb ₂Te ₃Or Bi ₂Te ₃, and the thermoelectric material that replaces and 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 raw material of Bi, Sb, Zn, Pb, Co, Fe, Sn, add distilled water, potassium borohydride, NaOH and macromolecular compound polyethylene glycol (molecular weight is 20000) then, under 50 ℃～100 ℃ conditions, reacted 12～48 hours, make the spherical nano inner core of core-shell structure nano pyroelectric material.

B. the spherical nano 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 through the spherical nano inner core after the surface treatment in the autoclave, again with in two or more adding reaction vessel in soluble-salt, tellurium powder and the selenium powder raw material 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 core-shell structure nano pyroelectric material.

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, the concentration of surface treatment auxiliary agent is 0.1wt%～20wt%.

In the utility model, the end group of surface treatment auxiliary agent can carry out complexing with elements such as the spherical nano inner core of thermoelectric material and the bismuth in the shell, antimony, zinc, lead, cobalt, iron, tin, thereby realize that spherical nano inner core and the tight of shell are connected.

Claims

1, a kind of nano pyroelectric material of nucleocapsid structure comprises spherical nano inner core and is coated on the outer shell of nano inner core that it is characterized in that nano inner core and shell closely cooperate with one heart, nano inner core adopts different thermoelectric materials with shell;

The material of described nano 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;