KR101388778B1 - Manufacturing method for thermoelectric nanocomposite film - Google Patents

Abstract

The present invention relates to a method for manufacturing a thermoelectric nanocomposite film and, more specifically, to a method for manufacturing a thermoelectric nanocomposite film which comprises the steps of: applying thermoelectric nanocomposite solution on a substrate; and drying the applied thermoelectric nanocomposite solution, wherein nanostructures included in the dried thermoelectric nanocomposite are oriented in a specific direction. According to the present invention, the thermoelectric nanocomposite film having high thermoelectric effect and electrical conductivity can be formed.

Description

Manufacturing Method of Thermoelectric Nanocomposite Film {MANUFACTURING METHOD FOR THERMOELECTRIC NANOCOMPOSITE FILM}

The present invention relates to a thermoelectric nanocomposite and a method of manufacturing the same. More particularly, the present invention relates to a thermoelectric nanocomposite which exhibits high thermoelectric properties and electrical conductivity, and which is produced by a simple process, and a method for producing the same.

The thermoelectric effect is a reversible, direct energy conversion between heat and electricity. Thermoelectric effects can be divided into whitening effect, Peltier effect, and Thomson effect.

The Seebeck effect is a phenomenon in which a temperature difference is directly converted into electricity, and electromotive force is generated from a temperature difference across the material. The Peltier effect is a phenomenon in which heat is generated at the upper junction and heat is absorbed at the lower junction when a current is flowed by joining two metals of different ends. The Thomson effect is an exothermic and endothermic event where the temperature changes when there is a partial temperature difference on the same metal.

The performance of the thermoelectric material can be expressed by the following equation: ZT = TS ² σ / k (T = absolute temperature, S = thermocouple constant, σ = electrical conductivity, k = thermal conductivity) (?) and the thermal conductivity (k) can be independently controlled.

However, according to the Wiedemann-Franz law (k = σLT, L = Lorenz constant), the electrical conductivity (σ) is primarily proportional to the thermal conductivity (k) (σ) also show a high value, which makes it impossible to improve the thermoelectric performance index value.

On the other hand, Dresslhaus of MIT University in the USA theoretically suggested that thermoelectric materials could be made into low-dimensional nanostructures of quantum dots and superlattices to improve thermoelectric performance (LD Hicks and MS Dresselhaus, "Effect of Quantum This theory has attracted much attention in the field of thermoelectric material development with the recent development of nanotechnology. [0003] 2. Description of the Related Art [0004]

That is, a nano-sized heterogeneous thermoelectric material is periodically inserted into the matrix in the form of a heteronucleotide of several nanometers or a superlattice structure is formed by crossing a heterogeneous thermoelectric material of several nanometers in a cycle, It is reported that the ZT value can be increased by maximizing the scattering of the phonon for heat transfer and lowering the thermal conductivity.

An object of the present invention is to provide a thermoelectric nanocomposite exhibiting high thermoelectric properties and electrical conductivity.

Another object of the present invention is to provide a simple process for producing a thermoelectric nanocomposite by dispersing a nanostructure in a polymer matrix.

It is still another object of the present invention to provide a method for producing a thermoelectric nanocomposite in the form of a film.

Method for manufacturing a thermoelectric nano composite film according to an embodiment of the present invention, the step of applying a thermoelectric nano composite solution on a substrate; And drying the applied thermoelectric nanocomposite solution, wherein the nanostructures included in the dried thermoelectric nanocomposite are oriented in a specific direction.

The thermoelectric nanocomposite solution may have a form in which the nanostructures are dispersed in a polymer matrix.

In addition, a shear force in a first direction may be applied during and / or before and after the drying step, and the nanostructures may be oriented along the first direction. The first direction may be either a casting direction or a film width direction or a bidirectional direction.

The nanostructure may include at least one of a nano particle, a nano wire, a nano sheet, and a nano tube.

The nanostructure may be formed from a solution in which a bulk material is dispersed. The bulk material may be a metal oxide, a Bi-Te system, a Pb-Te system, a Co-Sb system, a Si- ≪ / RTI > and combinations thereof.

The polymer matrix is polyacetylene, polyaniline, polypyrrole, polythiophene, poly (3,4-ethylenedioxythiophene), poly (3-methylthiophene), poly (para-phenylene), poly (para- Phenylenevinylene), poly (2,7-carbazolylenevinylene), blends and copolymers thereof.

According to the present invention, thermoelectric nanocomposite having high thermoelectric properties and high electrical conductivity can be formed.

Further, according to the present invention, a thermoelectric nanocomposite can be produced by a simple process.

Also, according to the present invention, the thermoelectric nanocomposite can be produced in the form of a film, and the thermoelectric property and the electric conductivity can be improved in the process of producing the film.

FIG. 1 is a view for explaining a method of manufacturing a thermoelectric nanocomposite according to an embodiment of the present invention in order of process.
FIGS. 2 to 5 are diagrams for explaining a morphology structure in which a nanostructure is dispersed in a polymer matrix. FIG.
6 is a schematic view of a conventional tape casting method.
FIGS. 7 and 8 are schematic views showing a morphology structure of a thermoelectric nanocomposite film produced by a tape casting process.
FIG. 9 is a front view of a thermoelectric device utilizing thermoelectric nanocomposite according to an embodiment of the present invention.
10 is a plan view of a thermoelectric device utilizing thermoelectric nanocomposite according to an embodiment of the present invention.

The terms used in the present specification are used to easily explain the present invention. Accordingly, the invention is not limited by the terms used herein.

On the contrary, the invention can be modified or modified without departing from the spirit and scope of the invention. Modifications or variations that do not depart from the spirit and scope of the present invention will be apparent to those skilled in the art. Accordingly, the invention includes modifications or variations that do not depart from the spirit and scope of the invention. The present invention is not limited to the following embodiments.

Hereinafter, the present invention will be described with reference to the accompanying drawings. Here, the drawings are intended to help understanding of the present invention, and the technical spirit of the present invention is not limited to the accompanying drawings. On the other hand, the same reference numerals are used for the same constituent elements in the drawings, and redundant explanations can be omitted.

The term 'nano structure' as used herein refers to a structure having a zero-dimensional point structure (for example, a nano particle, a one-dimensional linear structure (for example, (E.g., nanowire), a two dimensional planar structure (e.g., a nano sheet), or a three dimensional spatial structure (e.g., a nanotube) .

As used herein, the term " nano chain " refers to an aggregate formed by physically contacting the nanostructures with each other. For example, a nanocycle may be a structure in which one nanowire and a nanotube are in contact with each other. In another example, a nanostructure may be a structure formed by two nanosheets and one nanoparticle interposed therebetween.

Hereinafter, the thermoelectric nanocomposite according to one embodiment of the present invention will be described in detail.

The thermoelectric nanocomposite according to one embodiment of the present invention is a composite in which a nanostructure is dispersed in a polymer matrix, and may be a solution or a composite in a solid state.

In addition, the mechanism for improving thermoelectric properties of thermoelectric nanocomposite according to an embodiment of the present invention uses a nanostructure to improve the thermoelectric property, and also realizes high electrical conductivity and low thermal conductivity of the thermoelectric nanocomposite as a whole A polymer matrix is used.

The polymer matrix may be selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, poly (3,4-ethylenedioxythiophene), poly (3-methylthiophene) And at least one polymer selected from the group consisting of poly (2,7-carbazolylene vinylene) and blends thereof and co-polymers thereof. For example, a polymer poly (3,4-ethylenedioxythiophene) having high electrical conductivity and a polymer poly (para-phenylenevinylene) having low thermal conductivity may be blended. However, the polymer matrix is not limited to these materials.

The nanostructure may be at least one of a nanoparticle, a nanowire, a nanosheet, and a nanotube, and the thermoelectric nanocomposite may have at least one or more nanostructures dispersed therein.

The nanostructure can be produced from a solution in which a bulk material is dispersed, and a specific production method will be described later in the related section.

Meanwhile, the thermoelectric nanocomposite solution may further include an organic solvent to improve the dispersibility of the nanostructure to the polymer matrix.

The organic solvent may be at least one selected from the group consisting of ethanol, toluene, methylethylketone, dimethylformamide, cyclohexyl-pyrrolidinone, N- Dodecyl-pyrrolidone, benzyl benzoate, isopropanol, N-octyl-pyrrolidone, N-vinyl-pyrrolidinone, benzyl ether Benzyl ether, cyclohexanone, dimethylsulphoxide, N-methyl pyrrolidinone, acetone, isopropyl alcohol, and combinations thereof. And the like. However, the organic solvent is not limited to these materials.

On the other hand, when the nanostructure is dispersed in the polymer matrix, the composition ratio of the nanostructure to the polymer matrix contained in the thermoelectric nanocomposite may be 1 wt% or more and 95 wt% or less. More preferably 1 wt% or more and 30 wt% or less.

At this time, the electrical conductivity of the thermoelectric nanocomposite may be preferably 0.1 S / cm or more and 5000 S / cm or less.

In addition, the thermal conductivity of the thermoelectric nanocomposite may preferably be 0.05 or more and 0.5 W / mK or less.

In addition, the value of thermoelectric performance index (ZT) of the thermoelectric nanocomposite may be at least 0.1.

That is, according to the thermoelectric nanocomposite according to one embodiment of the present invention, it is possible to produce a thermoelectric nanocomposite having a high thermoelectric effect and a high electrical conductivity.

Hereinafter, a method of manufacturing a thermoelectric nanocomposite according to an embodiment of the present invention will be described in detail.

FIG. 1 is a view for explaining a method of manufacturing a thermoelectric nanocomposite according to an embodiment of the present invention in order of process.

Referring to FIG. 1, a method of manufacturing a thermoelectric nanocomposite according to an embodiment of the present invention includes the steps of (i) providing a polymer matrix (S10), (ii) preparing a solution in which a bulk material is dispersed in the polymer matrix (S12), and iii) a step (S14) of producing a nanostructure from the solution in which the bulk material is dispersed.

First, a polymer matrix as described above is provided (S10).

Next, the bulk material having thermoelectric properties is dispersed in the polymer matrix (S12).

The thermally conductive bulk material is preferably selected from the group consisting of a metal oxide, Bi-Te, Pb-Te, Co-Sb, Si-Ge or Fe-Si It can be more than one.

The metal oxide is a compound containing at least one element selected from metal elements such as Co, Ni, Cu, Ru, Ir, Pt, and Ti and at least an oxygen element. For example, it may preferably be at least one selected from Ca ₃ CO ₄ O ₉ , NaxCoO ₂ , SrTiO _{3 and} Zn ₄ Sb ₃ .

The Bi-Te system may be a material containing at least two elements of Bi, Sb, Te and Se, and the Pb-Te system may be a material including both Pb and Te and including other elements. Further, the Co-Sb system may be a material containing one element of Co and Fe and Sb, and the Si-Ge system may be a material including both Si and Ge, and the Fe-Si system may be Fe And Si. For example, it may preferably be at least one selected from Bi ₂ Te ₃ , BiSbTe, PbTe, and Si _1-x Ge _x . However, the thermoelectric bulk material is not limited to these materials.

The bulk material having the thermoelectric property may be an n-type or p-type thermoelectric material. Examples of the n-type thermoelectric material include Bi ₂ Te ₃ , and the p-type thermoelectric material includes BiSbTe. .

Meanwhile, conventionally known methods can be used as a method of dispersing the thermally conductive bulk material in the polymer matrix.

For example, it can be dispersed using a ball-milling method. The ball-milling method is a method of mixing a conductive polymer and a bulk powder material in a solvent, and then milling the mixture in a container such as a jelly bottle together with a medium such as a zirconia ball.

In order to improve the dispersibility of the bulk material to the polymer matrix, a dispersing agent or a surfactant may be added. For example, the dispersant or the surfactant may include an anionic surfactant, a nonionic surfactant, a cationic surfactant, a positive surfactant, a silicon surfactant, a fluorine surfactant, a polymerization surfactant, and the like. Preferably, the dispersing agent is at least one selected from the group consisting of sodium hexametaphosphate, sodium lignosulphonate, sodium sulfate, sodium phosphate, and sodium sulfonate. It can be one. Also preferably, the surfactant is selected from the group consisting of anionic, nonionic and fluorine-containing DuPont? Zonyl series can be included. However, the dispersant or the surfactant is not limited to these materials.

Next, a nanostructure is formed from a solution in which the bulk material is dispersed (hereinafter referred to as a 'compound') (S14).

Here, the method of producing the nanostructure may be various. For example, when the nanostructure is a nanosheet, the nanosheet may be exfoliated from the compound. Hereinafter, the case where the nanostructure is a nanosheet will be described as an example.

For example, the nanosheets can be prepared by treating the compound with an acid to effect ion exchange, and reacting the ion-exchanged metal oxide with an alkylammonium or amine compound to exfoliate the acid-treated reaction product.

Specifically, the formula [AxCoO2]: cobalt oxide represented by the above formula (A alkali metal, 0.3≤x≤1), for _{example, Ca 3 Co 4 O 9,} NaxCoO 2 by treatment with a proton acid at least a portion of the alkali metal (H < + >).

The acid used for the ion exchange may have a strength sufficient for ion exchange, and preferably at least one selected from the group consisting of HCl, HNO _3, and H ₂ So ₄ .

In addition, the ion exchange reaction may be carried out in the presence of an acid for 6 hours or more, and preferably for 2 days or more. After the ion exchange reaction, the ion exchanged cobalt oxide may be A _jk H _k CoO ₂ y H ₂ O (0? J? X, 0? K? J, 0? Y?

Next, the ion-exchanged metal oxide may be reacted with an alkylammonium or amine compound. Here, the alkylammonium may be intercalated between layers, ion exchangeable with interlayer cations, and having a sufficient molecular size so as to weaken the interlayer coupling force so that one layer can be separated. For example, the alkylammonium is preferably selected from the group consisting of tetrabutylammonium hydroxide, tetrapropylammonium hydroxide, tetraethylammonium hydroxide, tetramethylammonium hydroxide, But are not limited to, Tetramethylammonium hydroxide, Tetrabutylammonium bromide, Tetrapropylammonium bromide, Tetraethylammonium bromide, Tetramethylammonium bromide, Tetrabuthlammonium chloride, (12hd) selected from the group consisting of Tetrapethylammonium chloride, Tetraethylammonium chloride and Tetramethylammonium chloride, Or more. However, the alkylammonium is not limited to these materials.

In another example, ions may be intercalated and exfoliated between the layers of the compound, followed by treatment with ultrasonic waves to produce a solution in which the nanostructure is dispersed.

The compound may be preferably transition metal dichalcogenides compounds such as bismuth selenides / tellurides.

The intercalating ions of the compound are selected from the group consisting of alkali metals (for example, Li, Na, K, Rb and Cs), alkaline earth metals (for example, Mg, Ca, Sr and Ba) At least one.

The intercalation may be performed by an electrochemical method, dissolving in a liquid ammonia solution, heat, the use of n-butyl lithium in a hydrocarbon solvent, the use of an alkaline naphtha in an ether, The use of naphthalide, or the amalgam.

The ultrasonic treatment may be performed at an ambient temperature of 10 W or more and 500 W or less for 10 minutes to 6 hours, and it may be more preferable to irradiate ultrasound for 6 hours at an energy of 500 W at room temperature.

For example, lithium ions can be inserted into a solution of a Bi ₂ Se ₃ bulk material dispersed in a sheet of five thicknesses of atoms composed of Se-Bi-Se-Bi-Se in van der Waals force. Said inserting step is carried out in the presence of bismuth selenide (Bi ₂ Se ₃ ) and / or bismuth selenide together with its n-type derivative (Se partially replaced with Te) or a p-type derivative thereof (Sb partially substitutes Bi) Or telluride (Bi ₂ Te ₃ ) can be carried out by electrochemical methods or by enantiomerically in liquid ammonia, heat, hydrocarbon solvents (suitably hexane), enantiomeric naphthalide in ether, or amalgam. Preferably, bismuth selenide (Bi ₂ Se ₃ ) is dissolved in a liquid ammoniacal solution under the condition of -45 ° C overnight, and Li is inserted and subjected to ultrasonic treatment at 500 W for 6 hours, whereby the peeled nanostructure is dispersed Thermoelectric nanocomposite solution can be prepared. The nanostructure thus formed may have a thickness of 4 nm, a diameter of 200 nm, and a length of 1 μm.

Further, an organic solvent may be further added before and / or after the ultrasonic treatment. The organic solvent may be at least one selected from the group consisting of ethanol, toluene, methylethylketone, dimethylformamide, cyclohexyl-pyrrolidinone, N- Dodecyl-pyrrolidone, benzyl benzoate, isopropanol, N-octyl-pyrrolidone, N-vinyl-pyrrolidinone, benzyl ether Benzyl ether, cyclohexanone, dimethylsulphoxide, N-methyl pyrrolidinone, acetone, isopropyl alcohol, and combinations thereof. And the like. However, the organic solvent is not limited to these materials.

In another example, ultrasonic waves may be treated between layers of the compound without an intercalating process to produce a solution in which the nanostructure is dispersed.

The ultrasonic treatment may be performed at an ambient temperature of 10 W or more and 500 W or less for 10 minutes or more for 6 hours. Further, an organic solvent as described above may be further added before and / or after the ultrasonic treatment.

Without such an inserting step, the exfoliation method by ultrasonic treatment may be advantageous in that the exfoliation and dispersion are performed in a single step, which simplifies the process.

Further, after the ultrasonic treatment by the above process, a shear force such as air milling, ball milling, rotating blade shearing, and the like at a relatively low temperature (for example, room temperature) A mechanical shearing treatment can be performed, thereby further improving the thermoelectric properties.

On the other hand, the thermoelectric nanocomposite solution in which the exfoliated nanostructure is dispersed may contain nanowires, nanoparticles, nanotubes, and the like in addition to the nanosheet.

The nanowires, nanoparticles, and nanotubes may be produced together with the nanosheet as described above, or nanowires, nanoparticles, and nanotubes may be separately generated and mixed into the thermoelectric nanocomposite solution.

Hereinafter, a morphology structure of thermoelectric nanocomposite according to an embodiment of the present invention will be described in detail.

FIGS. 2 to 6 are diagrams for explaining a morphology structure in which nanostructures are dispersed in a polymer matrix in a thermoelectric nanocomposite according to an embodiment of the present invention. FIG.

Referring to FIG. 2, a thermoelectric nanocomposite according to an embodiment of the present invention may include a plurality of nanoparticles 21 and nanosheets 23 dispersed in a polymer matrix 10.

Here, when the ratio of the area occupied by the nanostructure per unit area in the polymer matrix is 10% or more and 70% or less, the thermoelectric properties and / or the electrical conductivity of the thermoelectric nanocomposite according to one embodiment of the present invention can be optimized. That is, the electrical conductivity and thermoelectric properties of the thermoelectric nanocomposite as a whole may vary depending on the proportion of the nanostructure per unit area in the polymer matrix.

For example, when the nanostructure is dispersed in the polymer matrix, the thermoelectric characteristics of the thermoelectric nanocomposite can be improved by increasing the ratio of the thermoelectric nanostructure per unit area. This is because the thermoelectric performance index ZT indicating the thermoelectric performance of the thermoelectric material is proportional to the square of the value of the thermoelectric coefficient S of the thermoelectric material.

Alternatively, for example, when the nanostructure is dispersed in a polymer matrix having a high electrical conductivity and a low thermal conductivity, the thermoelectric properties of the thermoelectric nanocomposite can be improved by dispersing a small amount of the nanostructure. This is because the thermoelectric performance index ZT indicating the thermoelectric performance of the thermoelectric material is proportional to the electric conductivity () and inversely proportional to the thermal conductivity k.

On the other hand, when the average length of one nanocrystal dispersed in the polymer matrix is at least 100 nm, the thermoelectric properties and / or the electrical conductivity of the thermoelectric nanocomposite according to one embodiment of the present invention can be optimized. That is, the electrical conductivity and thermoelectric properties of the thermoelectric nanocomposite as a whole may also vary depending on the average length of the nanoseconds dispersed in the polymer matrix. This is because the nanoclean can provide a mean free path that is an average distance that electrons can move without colliding with other particles.

In other words, since the length of the average free path can be longer when the average length of the nanostructures is longer, electrons can move smoothly without colliding with other particles, and the electric conductivity can be increased.

For example, as shown in FIG. 3, the average length L1 of the first nanocolumns 30 is A, the direction of movement of electrons is X, Is B, and the movement direction of the electrons may be X '. In this case, when the average length of the nanochain is A > B, the electric conductivity of the first nanochain may be higher than that of the second nanochain. However, if the thermoelectric number of the nanostructures constituting the second nanostructure is larger than the thermostatic number of the nanostructures constituting the first nanostructure, the thermoelectric effect of the second nanostructure may be higher.

Also, for example, in the case of a Bi ₂ Te ₃ thermoelectric material, the phonon has an average free path of several nm, and the electrons can have an average free path of several hundred nm, which is much longer than the phonon Therefore, a high thermoelectric effect can be exhibited.

In addition, a nanostructure having two nanosheets shown in FIG. 3 and one nanoparticle interposed therebetween, or a nanostructure composed only of nanosheets as shown in FIG. 4, may be formed.

In addition, as shown in Fig. 5, a nanocycle may be formed in which two nanosheets, one nanoparticle, two nanosheets, and one or more nanowires are interposed.

However, when the nanostructures are dispersed excessively, the electrical conductivity may be lowered. Therefore, it is preferable that the average length of one nanostructure dispersed in the polymer matrix is 100 nm or more and 50 m or less.

Here, it is preferable that the thermoelectric nanocomposite has an electrical conductivity of at least 0.1 S / cm or more and a thermal conductivity of at least 0.05 W / mK or more.

Also, the electrical conductivity and thermoelectric properties can be improved when the nanostructures form a nanostructure, rather than when the nanostructures are dispersed in the same polymer matrix.

Hereinafter, a method of producing a thermoelectric nanocomposite according to an embodiment of the present invention in the form of a film will be described in detail.

That is, a thermoelectric nanocomposite material (hereinafter referred to as a thermoelectric nanocomposite film) in the form of a film can be manufactured using the thermoelectric nanocomposite produced by the above-described method. Hereinafter, a tape casting process will be described as a typical method of manufacturing the thermoelectric nanocomposite film with reference to the drawings.

FIG. 7 is a schematic view of a conventional tape casting method, and FIG. 8 is a schematic view of a morphology structure of a thermoelectric nanocomposite film produced by a tape casting process.

Referring to FIG. 7, the slurry contained in the dam 110 of the tape casting apparatus 100 may be tape cast onto the polymer base film on the conveyor through a height adjustable blade 120. The slurry applied by the tape casting apparatus 100 fixedly mounted on the polymer base film on the conveyor can be dried and passed through a drying tunnel (not shown) equipped with a heater to complete a film.

That is, the dam 110 may store the thermoelectric nanocomposite solution described above, and the thermoelectric nanocomposite solution may be tape-cast onto the polymer base film on the conveyor. Accordingly, the thermotropic nanocomposite solution applied on the polymer base film on the conveyor may be dried to form a film.

At this time, when the thermotropic nanocomposite solution is cast on the polymer base film, a shearing stress in a certain direction may be applied during and / or after the heat treatment. The predetermined direction can be stretched in either one direction or both directions of the casting direction (D1) or the film width direction (D2), and the stretched direction can be adjusted to produce an oriented film.

For example, referring to FIG. 8, the nanostructures can be oriented in the direction D1 by the shear force in the casting direction D1.

Further, referring to FIG. 9, for example, the nanostructures can be oriented in the D3 direction by applying a shear force in both directions of the casting direction D1 and the film width direction D2.

Therefore, the electric conductivity can be improved by allowing the smooth movement of electrons according to the orientation of the nanostructures by the shear force.

When the thermoelectric nanocomposite solution is produced in the form of a film by a tape casting process, it is possible to produce a composite device in which the nanostructures are oriented in a specific direction to exhibit high thermoelectric properties and at the same time, electric conductivity is improved.

Hereinafter, a thermoelectric device utilizing a thermoelectric nanocomposite solution or a thermoelectric nanocomposite film according to an embodiment of the present invention will be described.

FIG. 9 is a front view of a thermoelectric device according to an embodiment of the present invention, and FIG. 10 is a plan view of a thermoelectric device according to an embodiment of the present invention.

9 and 10, a thermoelectric device according to an embodiment of the present invention includes a substrate 40, an insulating layer 42 formed on the substrate, a plurality of electrodes 44 formed on the insulating layer, And the P-type thermoelectric nanocomposite 50 and the N-type thermoelectric nanocomposite 60 may be attached to the electrode 44. Here, the P-type thermoelectric nanocomposite 50 may be composed of a P-type nanostructure and a P-type conductive polymer, and the N-type thermoelectric nanocomposite 60 may include an N-type nanostructure and an N-type conductive polymer ≪ / RTI >

Specifically, in the method of manufacturing the thermoelectric element, a metal thin film (not shown) is patterned on a separable substrate 40 to a predetermined size.

The material of the detachable substrate 10 may be a polymer, in particular an organic polymer, glass, or the like, and may preferably be a polyimide or liquid crystal polymer film. As a method for forming the metal thin film on the substrate 10, there is a thin film manufacturing method such as direct bonding, plating, pasting, and vapor deposition.

Next, the metal thin film is patterned to a predetermined size on the detachable substrate 40, and then the thermoelectric nanocomposites 50 and 60 are deposited on the metal thin film using a shadow mask (not shown) or by screen printing do. Examples of the deposition method include thermal evaporation, E-beam, sputtering, CVD (Chemical Vapor Deposition) and the like, but it may be preferable to use thermal deposition or ion beam deposition .

Alternatively, as another method of manufacturing the thermoelectric element, a method of applying the thermoelectric nanocomposite solution onto the metal thin film by an inkjet method may be possible.

Alternatively, a method of directly attaching the thermoelectric nanocomposite film on the metal thin film may be possible.

Therefore, according to the method of manufacturing a thermoelectric nanocomposite device according to an embodiment of the present invention, since the position of the thermoelectric nanocomposite material can be determined at the time of assembly, the process can be simplified compared to the case of general etching.

On the other hand, such a thermoelectric element can be applied to a power generation field by utilizing a phenomenon that an electromotive force is generated by an electromotive force at both ends when a temperature difference is applied to both ends of the material. When current is supplied through the dissimilar metals at both ends, It can be applied to a cooling field by using a shape in which cooling or heat is generated.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings. In addition, the embodiments described in this document can be applied to not only the present invention, but also all or some of the embodiments may be selectively combined so that various modifications can be made.

10: polymer matrix 21: nanoparticle < RTI ID = 0.0 >
23: nanosheet 30, 32: nanochain,
40: substrate 42: insulating layer
44: Electrode 50: P-type thermoelectric nanocomposite
60: N type thermoelectric nano composite

Claims (9)

Applying a thermoelectric nanocomposite solution on the substrate; And
Including; drying the applied thermoelectric nanocomposite solution;
The method of manufacturing a thermoelectric nanocomposite film, characterized in that the nanostructures contained in the dried thermoelectric nanocomposite are oriented in a specific direction.
The method of claim 1, wherein the thermoelectric nano composite solution,
A method of manufacturing a thermoelectric nanocomposite film in which the nanostructures are dispersed in a polymer matrix.
The method of claim 1,
A method of manufacturing a thermoelectric nanocomposite film to which a shear force in a first direction is applied during the drying step or before and after the drying step.
The method of claim 3,
The nanostructures are oriented in the first direction, characterized in that the manufacturing method of the thermoelectric nanocomposite film.
The method of claim 3, wherein the first direction,
The manufacturing method of the thermoelectric nanocomposite film which is the direction of a casting direction or the film width direction, or bidirectional.
2. The nanostructure according to claim 1,
A method of manufacturing a thermoelectric nanocomposite film comprising at least one of nanoparticles, nano wires, nano sheets, nano sheets, and nano tubes.
The method of manufacturing a thermoelectric nanocomposite film according to claim 1, wherein the nanostructure is produced from a solution in which bulk materials are dispersed.
The thermoelectric material of claim 7, wherein the bulk material is selected from the group consisting of metal oxides, Bi-Te-based, Pb-Te-based, Co-Sb-based, Si-Ge-based, Fe-Si-based, and combinations thereof. Method of producing a nanocomposite film.
The method of claim 2, wherein the polymer matrix,
Polyacetylene, polyaniline, polypyrrole, polythiophene, poly (3,4-ethylenedioxythiophene), poly (3-methylthiophene), poly (para-phenylene), poly (para-phenylenevinylene) And at least one selected from the group consisting of poly (2,7-carbazolylenevinylene), blends and copolymers thereof.

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