KR20160141066A - Synthetic method of nano structure using spinodal decomposition by multi-layered precursor - Google Patents

Abstract

The present invention relates to a method for synthesizing nanostructures by inducing spinodal decomposition with a multi-layered precursor, the method comprising the steps of: (a1) depositing material A on a substrate to form a first layer; (a2) depositing a first compound of the material A and material B on the first layer to form a second layer; (a3) depositing additionally the material B on the second layer to form a third layer; (a4) heating the multi-layered precursor made of the first to third layers to conduct phase separation of the first compound of the second layer into a solid state second compound of the materials A and B, and a liquid material A by spinodal decomposition; and (a5) dispersing the material A of the first layer into the second compound through the liquefied material A of step (a4) and growing the same in the shape of nanowires. The present invention has the effect of synthesizing nanostructures by inducing spinodal decomposition using a multi-layered precursor structure.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of synthesizing a nanostructure by spinodal phase separation using a multi-layered precursor,

The present invention relates to a method for synthesizing a nanostructure, and more particularly, to a method for synthesizing vertically aligned nanostructures by generating spinodal phase separation using a layered precursor.

The nanostructures have excellent electrical, optical and mechanical properties due to the quantum confinement effect, and research and practical application of the nanostructures are underway. In particular, nanowires have a large specific surface area and high crystallinity, and many researches for elementization have been carried out.

Vapor-Liquid-Solid (VLS) and Vapor-Solid (VLS) methods using metal catalysts such as gold (Au) are theoretically and experimentally widely used because they can theoretically predict the synthesis of nano- . The VLS method and the VL method have been extensively studied as methods for synthesizing materials such as silicon (Si) and germanium (Ge).

In the case of the nanowire synthesis method using gold-silicon (Au-Si), gold (Au) and silicon (Si) are melted by heat treatment to make a droplet alloy of gold-silicon (Au-Si) And is melted and heat-treated at a temperature higher than the eutectic point to produce a droplet alloy of gold-silicon (Au-Si). When silicon (Si) is continuously supplied in a vapor state, silicon in a vapor state is dissolved in a liquid gold-silicon (Au-Si) droplet alloy, and supersaturation is performed, (Si) precipitates in the form of a nanowire.

A compound such as zinc oxide (ZnO) or gallium nitride (GaN) other than a single element semiconductor such as silicon (Si) or germanium (Ge) can be synthesized through such a method, .

However, the above-mentioned method has a disadvantage that a metal catalyst such as gold (Au) is continuously remained even after the nanowire synthesis process, and therefore there is a problem that the junction characteristics of the device become poor due to the metal catalyst. In addition, there is a problem that metal impurities may be contained therein, which may interfere with the movement of electric charges, or may reduce the characteristics of the light emitting device causing charge hole pairs at the defect level in the energy band.

On the other hand, studies for synthesizing nanowires using a phase separation method without using a metal catalyst have been conventionally studied for synthesizing Zn-Sb or γ-Bi ₂ MoO ₆ . For this, Zn-Sb or Bi ₂ MoO ₆ with amorphous morphology was electrochemically deposited and annealed to synthesize nanowires.

However, after synthesis, an element containing a larger amount of Zn-Sb remains after the synthesis of the compound, resulting in a problem in manufacturing a device having a constant characteristic.

In addition, in the conventional method using the phase separation method, it is impossible to control the growth direction of the nanowire. In order to utilize the nanowire, the nanowire must be transferred after growth.

Currently, attempts to solve such technical problems in synthesis of nanowire using phase separation method have not been presented yet.

(Document 1) United States Patent No. 6,464,132 (Oct. 15, 2002) (Document 2) United States Patent No. 7,820,064 (Oct. 26, 2010)

The method for synthesizing a nanostructure by generating spinodal phase separation with the layered precursor according to the present invention has the following problems.

First, we try to synthesize nanostructures by phase separation using a stacked precursor structure.

Second, additional materials with low melting point and high vapor pressure are added, and after the synthesis of the nanowire, it is evaporated and selectively removed.

The solution of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

The present invention relates to a method of synthesizing a nanostructure by generating spinodal phase separation with a layered precursor, comprising the steps of: (a1) depositing a substance A on a substrate to form a first layer; (a2) depositing a first compound of material A and material B on a first layer to form a second layer; (a3) further depositing material B over the second layer to form a third layer; (a4) a layered precursor consisting of a first layer to a third layer is subjected to a heat treatment so that the first compound in the second layer is converted into a solid phase second compound of the substance A and the substance B via the spinodal phase separation, Performing phase separation; And (a5) diffusing the substance A of the first layer into the second compound through the liquefied substance A in the step (a4), and growing it into a nanowire shape.

 The first compound according to the present invention is preferably a material capable of spinodal phase separation and is preferably selected from the group consisting of antimony-celin (Sb-Se), lead sulfide (PbS), lead selenium (PbSe) and tellurium tin It is more preferable to use either one.

The first compound according to the present invention is preferably an anisotropic structure.

In the present invention, the substance B preferably has a lower melting point and a higher vapor pressure than the substance A.

In the present invention, it is preferable that the substance A is antimony (Sb), the substance B is selenium (Se), the first compound is antimony-celin (Sb-Se) and the second compound is Sb ₂ Se ₃ .

In the present invention, it is preferable that the deposition method of step (a1) and step (a2) is electrodeposition.

In the present invention, the deposition method of step (a3) is preferably a thermal evaporation method.

In the present invention, the heat treatment in step (a4) is preferably rapid thermal annealing (RTA).

In the present invention, the heat treatment temperature is preferably 100 ° C to 450 ° C, and the heat treatment time is preferably 1 minute or more.

In the present invention, the heat treatment temperature is preferably 350 占 폚, and the heat treatment time is preferably 30 minutes or more.

In the present invention, the temperature rise is preferably 10 ° C / min or more, more preferably 20 ° C / min.

In the present invention, it is preferable that the pressure is maintained at a level at which the sublimation of the substance A, the substance B and the second compound is not performed during the heating treatment.

In the present invention, it is preferable to further include a step (a6) of providing a vacuum atmosphere after the step (a5) to evaporate and selectively remove the remaining material B.

In the present invention, it is preferable to maintain the pressure lower than the vapor pressure of the substance B.

The present invention relates to a method for synthesizing a nanostructure by generating spinodal phase separation using a layered precursor, comprising the steps of: (b1) depositing antimony (Sb) on a substrate to form a first layer; (b2) depositing a compound (Sb-Se) of antimony (Sb) and selenium (Se) on the first layer to form a second layer; (b3) further depositing selenium (Se) on the second layer to form a third layer; (b4) The compound of the second layer (Sb-Se) is subjected to spinodal phase separation to form a solid phase compound of antimony (Sb) and selenium (Se) by heating the layered precursor consisting of the first to third layers (Sb ₂ Se ₃ ) and liquid selenium (Se); (b5) a step of using an antimony (Sb) of selenium (Se) layer is the liquefaction of the first layer of antimony (Sb) is diffused into the growing Sb ₂ Se ₃ to nanowire shape; And (b6) providing a vacuum atmosphere to evaporate and selectively remove the remaining selenium (Se).

The present invention relates to a method for synthesizing a nanostructure by generating spinodal phase separation with a layered precursor, comprising the steps of: (c1) depositing a substance A on a substrate to form a first layer; (c2) depositing material B on the first layer to form a second layer; (c3) subjecting the layered precursor consisting of the first layer to the second layer to heat treatment to form a solid phase compound of substance A and substance B and a liquid phase substance A through spinodal phase separation; And (c4) diffusing the material A of the first layer into the solid-phase compound in the step (c3) through the liquefied material A in the step c3 to form the nanowire-shaped material.

The method of synthesizing a nanostructure by generating spinodal phase separation with the layered precursor according to the present invention has the following effects.

First, there is an effect of synthesizing a nanostructure by spinodal phase separation using a stacked precursor structure.

Secondly, it is possible to synthesize a pure nanostructure by additionally supplying a substance having a low melting point and a high vapor pressure, selectively removing the nanowire by evaporating it after synthesis.

Third, since vertical orientation is possible relatively, there is an effect that elementization can be performed without a transfer process.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a conceptual diagram illustrating a method of synthesizing a nanostructure according to the present invention.
2 is SEM image data showing that the nanowires are synthesized after the heat treatment according to the present invention.
Fig. 3 is a partially enlarged view of the point P1 in Fig. 2; Fig.
Fig. 4 is a partial enlargement of the point P2 in Fig. 3 and a diffraction image of the crystal.
FIG. 5 is a cross-sectional view of the layered precursor before heat treatment and data showing the composition in each part.
FIG. 6 shows XRD analysis results of the precursor before annealing and annealed at 350. FIG.
Fig. 7 shows the heat treatment conditions for the synthesis of nanowires.
Figure 8 shows the precursor deposited electrochemically and the precursor after the additional layers are deposited. And the surface shape at each point in Fig. 7 during the heat treatment process.
FIG. 9 shows the cross-sectional shape at 150 and the distribution of Sb and Se, which is the result of diffraction analysis showing the crystallinity of Se.
FIG. 10 shows the cross-sectional shape at 250 and the distribution of Sb and Se, which is the result of diffraction analysis showing the crystallinity of Se.
Fig. 11 shows the cross-sectional shape and the distribution of Sb and Se at 350, and the result of diffraction analysis showing the crystallinity of Se.
12 is a state diagram of Sb-Se. The phase transformation of the precursor during the heat treatment consists of R1, R2, R3.
13 is a schematic diagram of a method for synthesizing nanowires through heat treatment of a layered precursor.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. 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. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto.

Means that a particular feature, region, integer, step, operation, element and / or component is specified and that other specific features, regions, integers, steps, operations, elements, components, and / It does not exclude the existence or addition of a group.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

In the present invention, a laminate structure for depositing the elements constituting the compound is formed and annealed to synthesize the nanowires, and the growth direction can be changed by interlayer inserting.

The method for synthesizing a nanostructure according to the present invention uses a layered precursor, which shows an embodiment of a three-layer structure and an embodiment of a two-layer structure. Hereinafter, the present invention will be described with reference to an embodiment having a three-layer structure.

The present invention relates to a method for synthesizing a nanostructure by generating spinodal phase separation with a layered precursor.

A spinodal curve is a curve that represents the boundary between the metastable region and the unstable region that causes two-phase separation in the state phase diagram. On this curve, the intensity of the scattered light due to fluctuations in density or concentration becomes infinite. When the homogeneous phase goes beyond this curve into the insecure region, the concentration fluctuation is amplified and phase separation occurs. This is called spinodal decomposition. When spinodal decomposition occurs, the solution enters the unstable region without going through the metastable region. In other words, the stable single phase becomes unstable immediately and the phase is decomposed.

(A1) depositing a substance A on a substrate to form a first layer; (A2) depositing a first compound of material A and material B on a first layer to form a second layer; (A3) further depositing material B on the second layer to form a third layer; The layered precursor consisting of the first layer to the third layer is subjected to heat treatment to cause the first compound in the second layer to undergo phase separation through the spinodal phase separation into the solid phase second compound of substance A and substance B and the liquid phase substance A (a4); And (a5) diffusing the material A of the first layer into the second compound through the liquefied material A of the step (a4) and growing the material A into a nanowire shape.

The first compound according to the present invention is preferably a material capable of spinodal phase separation. Examples of such materials include PbS, lead selenium (PbSe), and tellurium tin (SnTe).

In addition, the first compound according to the present invention is preferably an anisotropic structure.

The material B according to the present invention preferably has a melting point lower than that of the material A and a high vapor pressure.

When synthesizing a compound of a nanostructure using the layered precursor according to the present invention, it is difficult to supply a larger amount of the substance B having a melting point lower than the substance A and a higher vapor pressure, It is effective to selectively remove the substance from the pressure.

The deposition method of the step (a1) and the step (a2) according to the present invention may be variously performed, and it is more preferable to use an electrodeposition method.

The deposition method of step (a3) according to the present invention may be variously performed, and more preferably, thermal evaporation.

The heat treatment in the step (a4) according to the present invention can be performed by various methods, and more preferably, it is rapid thermal annealing (RTA).

In the heat treatment in the step (a4) according to the present invention, the heat treatment temperature is preferably 100 ° C to 450 ° C, and the heat treatment time is preferably 1 minute or more. This is because, in the present invention, the substance B does not dissolve at a temperature of less than 100 ° C. in the heat treatment, and when the temperature exceeds 450 ° C., the second compound can sublimate. In particular, it is more preferable that the heat treatment temperature is 350 占 폚 and the heat treatment time is 30 minutes.

In the heat treatment of the step (a4) according to the present invention, the heat treatment time is preferably 1 minute or more. This is because in the present invention, when the heat treatment is performed for less than one minute, the first layer may not be completely dissolved in the liquefied material B.

In the heat treatment in the step (a4) according to the present invention, the temperature rise is preferably 10 ° C / min or more. This is because when the growth temperature is less than 10 ° C / min, the difference in the growth rate in all directions is lowered and it is not suitable for forming the nanowire structure. In particular, 20 DEG C / min is more preferable for nanowire synthesis.

During the heating process of step (a4) according to the present invention, it is preferable that the pressure maintains the sublimation of the substances A, B and the second compound. In particular, it is preferable to induce only the reaction for forming the second compound through an inert gas atmosphere such as nitrogen.

In the present invention, it is preferable to further include a step (a6) of providing a vacuum atmosphere after the step (a5) to evaporate and selectively remove the remaining material B. At this time, it is preferable to maintain the pressure lower than the vapor pressure of the substance B.

In the present invention, it is possible that the material A is antimony (Sb), the material B is selenium (Se), the first compound is antimony-celin (Sb-Se) and the second compound is Sb ₂ Se ₃ . This embodiment will be described in detail as follows.

That is, the present invention preferably includes the following steps.

(b1) depositing antimony (Sb) on the substrate to form a first layer;

(b2) depositing a compound (Sb-Se) of antimony (Sb) and selenium (Se) on the first layer to form a second layer;

(b3) further depositing selenium (Se) on the second layer to form a third layer;

(b4) The compound of the second layer (Sb-Se) is subjected to spinodal phase separation to form a solid phase compound of antimony (Sb) and selenium (Se) by heating the layered precursor consisting of the first to third layers (Sb ₂ Se ₃ ) and liquid selenium (Se);

(b5) Step of growing antimony (Sb) of the first layer into a nanowire shape by diffusing antimony (Sb) with Sb ₂ Se ₃ through selenium (Se)

(b6) providing a vacuum atmosphere to selectively evaporate the remaining selenium (Se).

The selenium antimony (Sb ₂ Se ₃ ) used in the embodiment of the present invention is a compound having an orthorhombic structure and has structural characteristics of anisotropy in the [001] direction. This structural feature allows Sb ₂ Se _{3 to} have a spontaneous one-dimensional structure (nanowire, nanobelt, etc.) by causing it to preferentially grow in the [001] direction.

Further, in the case of Sb ₂ Se ₃ , since the stable compound exists only in one phase of Sb ₂ Se ₃ , the device characteristics are reduced due to heterogeneous compounds generated after heat treatment in other semiconductor compounds There is an advantage not to occur.

Since Sb ₂ Se ₃ has a band gap of 1.2 eV, it can effectively absorb light in the visible light region and is suitable for a photovoltaic device. Since it is a layered structure of orthorhombic, Which is suitable for thermoelectric devices.

However, the research using Sb ₂ Se ₃ is not yet active, so further research is needed, and a broad research approach deviates from the research method mainly performed by vacuum method is needed. In particular, recently, research results on Sb ₂ Se ₃ nanowire synthesis with a band gap of 1.46 eV close to 1.5 eV, which is the ideal band gap for light absorption through nanostructures, have been reported. Bi - doped (Sb _{1 - x} Bix) ₂ Se ₃ nanowires show very good absorption characteristics of 639 nm monochromatic light. Therefore, active research on nanostructures is needed.

However, to date, Sb ₂ Se ₃ has only been synthesized by randomly arranged nanowires such as the hydrothermal method and the solvent thermolabile method except for the VLS method, There has been no report of successful successes.

In the present invention, Sb ₂ Se ₃ nanowire synthesis method having excellent crystal characteristics is realized by causing spinodal phase separation through heat treatment of a laminate structure. In the present invention, a precursor of a simple laminate structure was used, and a nanostructure was successfully synthesized by a simple heat treatment. In addition, it is the first research result that vertical orientation is possible, and it is expected that the application is broader based on the theoretical analysis of growth.

Meanwhile, the present invention is also applicable to a method of synthesizing a nanostructure by generating spinodal phase separation with a two-layered lamellar precursor, and includes the following steps:

(c1) depositing material A on a substrate to form a first layer;

(c2) depositing material B on the first layer to form a second layer;

(c3) subjecting the layered precursor consisting of the first layer to the second layer to heat treatment to form a solid phase compound of substance A and substance B and a liquid phase substance A through spinodal phase separation; And

(c4) a step of diffusing the substance A of the first layer into the solid phase compound of the step (c3) through the liquefied substance A of the step (c3) to form a nanowire shape.

On the other hand, in the present invention, a method of synthesizing a nanowire in a two-layer structure is based on having a pseudo first compound form at the interface between the material A and the material B.

[ Experimental Example ]

A. Production of precursors

An experimental method for synthesizing a vertically oriented nanostructure using a stacked precursor (Sb / Sb-Se / Se) is as follows. First, 0.035M K (SbO) C ₄ H ₄ O ₆ .0.5H ₂ O (antimony potassium tartrate), 0.045MH ₂ SeO ₃ (selenous acid) and 1 M NH ₄ Cl were added to the deionized water (ammonium chloride) is added and stirred to dissolve. At this time, it is ideal to proceed in the order of NH ₄ Cl, H ₂ SeO ₃ , K (SbO) C ₄ H ₄ O ₆ .0.5H ₂ O, and precipitation may occur when the order is reversed. The resulting solution has a pH of about 1.8. If a nanostructure grown in a horizontal direction is synthesized using an Sb / Se precursor, H ₂ SeO ₃ Do not use.

Electrodeposition method was employed in which a substrate was put in a solution made for the deposition (working electrode) and a counter electrode was placed on the opposite side to apply a voltage. In this case, a more stable voltage measurement is possible by using a reference electrode. In the present invention, a glass substrate coated with ITO as a working electrode, a counter electrode, and a reference electrode, a platinum foil, and silver / silver chloride (Ag / AgCl) . The ITO glass substrate used was a 200 nm thick ITO coated corning glass. Ultrasonic was used in acetone, ethanol, and DI water before deposition. And then washed sequentially.

Sb / Sb-Se or Sb was preferentially deposited by applying a voltage of -1400 mV to the working electrode and a selenium (Se) of ~ 5 μm thickness was further added thereto using a thermal evaporation method. So that sufficient selenium (Se) could be supplied.

B. Synthesis of nanostructures

The prepared Sb / Sb-Se / Se or Sb / Se precursor was annealed by rapid thermal annealing (RTA) to form a nanostructure (nanowire). The heat treatment was carried out at 350 ° C for 30 minutes and the temperature was 20 ° C / min. Nitrogen atmosphere of 40 kPa pressure was maintained during the heat treatment, and after the heat treatment, the remaining selenium (Se) remnant was evaporated by making a vacuum atmosphere at 250 캜.

[Experiment result]

A. Sb / Sb -Se / Se precursor results

After the heat treatment, it was confirmed that the vertically oriented Sb ₂ Se ₃ nanowires were synthesized, and that the selenium (Se), which was expected to be the residue, was completely evaporated.

B. Sb / Se precursor results

After the heat treatment, it was confirmed that the horizontally grown Sb ₂ Se ₃ nanowires were synthesized, and it was confirmed that all the selenium (Se) which was expected as the residue was evaporated.

As a result of collecting and confirming samples at each step of the heat treatment (refer to FIG. 7) of the Sb / Sb-Se / Se precursor according to the present invention, synthesis of nanowires (see FIG. 8) was possible by the following procedure. As shown in Fig. 8C and Fig. 9, there was no particular difference from the precursor at 150 DEG C in the heat treatment. This is equivalent to the fact that Sb, Sb-Se, and Se do not have any particular phase change at that temperature even in the state diagram.

However, as shown in FIGS. 8E and 10, amorphous Se was observed at 250 ° C., and it was confirmed that the Sb-Se layer crystallized. The crystallization of the Sb-Se layer can be controlled by the spinodal phase separation of Sb-Se at a temperature corresponding to Sb2Se3 and the liquid phase Se As shown in Fig.

As shown in Figs. 8F, 8G and 11, at a higher temperature of 350 DEG C, it can be seen that the Sb layer disappears and the Sb ₂ Se ₃ grows longer in the nanowire. It can be confirmed that Sb is dissolved in Se and contributed to the growth of Sb ₂ Se ₃ because Sb is dissolving in Se more than 2% at the corresponding temperature in the state diagram.

As shown in FIG. 13, specifically, Sb is dissolved in Se and diffuses to reach the vicinity of already formed Sb ₂ Se ₃ , where it reacts with liquid Se by a spinodal phase separation mechanism to easily form Sb ₂ Se ₃ compound Can be formed. As shown in FIGS. 3 and 4, Sb ₂ Se ₃ grows faster in the [001] direction of the material due to the anisotropic structural characteristic. Finally, the nanowire shape of the one-dimensional structure .

Finally, when the heat treatment is completed, the structure of Sb ₂ Se ₃ (nanowire) / Se (amorphous) remains as shown in FIG. 11. If heat treatment is further performed at a vacuum of 250 ° C, Se having a relatively high vapor pressure And is selectively evaporated. As a result, only pure Sb ₂ Se ₃ nanowire crystals can be synthesized as shown in FIG. 8g.

In the case of Sb / Se precursor, Sb-Se interface is expected to have similar reaction with Sb-Se. Finally, horizontal nanowires are synthesized, suggesting that Sb-Se layer helps vertical orientation .

The results of this study show that, when compounds are synthesized, the compounds have structural characteristics of anisotropy, and when they have an immiscibility gap such as spinodal phase separation, the nanostructures using the layered precursor This is an example showing that synthesis is possible. Materials such as lead sulfide (PbS), lead selenium (PbSe) and tellurium tin (SnTe) may be included. Particularly, when synthesizing a compound of a nanostructure using a layered precursor, supplying a larger amount of an element having a low melting point and a high vapor pressure results in the selective addition of the element at a low pressure after the synthesis .

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Accordingly, the embodiments disclosed herein are for the purpose of describing rather than limiting the technical spirit of the present invention, and it is apparent that the scope of the technical idea of the present invention is not limited by these embodiments. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (18)

(a1) depositing material A on a substrate to form a first layer;
(a2) depositing a first compound of material A and material B on a first layer to form a second layer;
(a3) further depositing material B over the second layer to form a third layer;
(a4) a layered precursor consisting of a first layer to a third layer is subjected to a heat treatment so that the first compound in the second layer is converted into a solid phase second compound of the substance A and the substance B via the spinodal phase separation, Performing phase separation; And
(a5) diffusing the substance A of the first layer into the second compound through the liquefied substance A of the step (a4) and growing it into a nanowire shape
A method of synthesizing a nanostructure by generating spinodal phase separation with a layered precursor. The method according to claim 1,
Wherein the first compound is a material capable of spinodal phase separation, and a spinodal phase separation is generated with a layered precursor, thereby synthesizing the nanostructure. The method of claim 2,
Wherein the first compound is a layered precursor that is one of antimony-celin (Sb-Se), lead sulfide (PbS), selenium tellurium (PbSe), and tellurium tin (SnTe) . The method according to claim 1,
Wherein the first compound is an anisotropic structure, and a spinodal phase separation is generated with a layered precursor to synthesize the nanostructure. The method according to claim 1,
Wherein the substance B has a melting point lower than that of the substance A and a high vapor pressure, and a spinodal phase separation is generated with the layered precursor to synthesize the nanostructure. Claim 1
Substance A is an element other than antimony (Sb), and the material B is selenium (Se), and the first compound is an antimony-Celine (Sb-Se), and the second compound are spinosyns month laminate precursor, characterized in that Sb ₂ Se ₃ A method for synthesizing a nanostructure by generating phase separation. The method according to claim 1,
wherein the step (a1) and the step (a2) are electrodeposition, and the spinodal phase separation is generated with the layered precursor to synthesize the nanostructure. The method according to claim 1,
wherein the deposition method of step (a3) is thermal evaporation, and the spinodal phase separation is generated with the layered precursor to synthesize the nanostructure. The method according to claim 1,
wherein the heat treatment in step (a4) is Rapid thermal annealing (RTA). 7. A method for synthesizing a nanostructure by generating spinodal phase separation using a layered precursor. The method of claim 9,
Wherein the heat treatment temperature is 100 ° C to 450 ° C and the heat treatment time is 1 minute or more. A method for synthesizing a nanostructure by generating spinodal phase separation with a layered precursor. The method of claim 10,
Wherein the heat treatment temperature is 350 占 폚 and the heat treatment time is 30 minutes or longer. A method for synthesizing a nanostructure by generating spinodal phase separation by a layered precursor. The method of claim 9,
And a temperature elevation is 10 ° C / min or more. A method for synthesizing a nanostructure by generating spinodal phase separation using a layered precursor. The method of claim 12,
And the temperature is raised at a rate of 20 ° C / min. A method for synthesizing a nanostructure by generating spinodal phase separation with a layered precursor. The method of claim 9,
Wherein the pressure is maintained at a level at which sublimation of the substance A, the substance B and the second compound does not occur during the heat treatment, and the spinodal phase separation is generated with the layered precursor to synthesize the nanostructure. The method of claim 1, wherein after step (a5)
Further comprising the step of: (a6) evaporating the remaining material B by providing a vacuum atmosphere to selectively remove the material B. The method of synthesizing a nanostructure by generating spinodal phase separation with a layered precursor. 16. The method of claim 15,
Wherein the nanostructure is maintained at a pressure lower than the vapor pressure of the substance B. 2. A method for synthesizing a nanostructure by generating spinodal phase separation with a layered precursor. (b1) depositing antimony (Sb) on the substrate to form a first layer;
(b2) depositing a compound (Sb-Se) of antimony (Sb) and selenium (Se) on the first layer to form a second layer;
(b3) further depositing selenium (Se) on the second layer to form a third layer;
(b4) The compound of the second layer (Sb-Se) is subjected to spinodal phase separation to form a solid phase compound of antimony (Sb) and selenium (Se) by heating the layered precursor consisting of the first to third layers (Sb ₂ Se ₃ ) and liquid selenium (Se);
(b5) a step of using an antimony (Sb) of selenium (Se) layer is the liquefaction of the first layer of antimony (Sb) is diffused into the growing Sb ₂ Se ₃ to nanowire shape; And
(b6) providing a vacuum atmosphere to evaporate and selectively remove the remaining selenium (Se), thereby producing spinodal phase separation, thereby synthesizing the nanostructure. (c1) depositing material A on a substrate to form a first layer;
(c2) depositing material B on the first layer to form a second layer;
(c3) subjecting the layered precursor consisting of the first layer to the second layer to heat treatment to form a solid phase compound of substance A and substance B and a liquid phase substance A through spinodal phase separation; And
(c4) diffusing the material A of the first layer into the solid phase compound of the step (c3) through the liquefied material A of the step (c3) and growing it into a nanowire shape. A method for synthesizing a nanostructure by generating phase separation.

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