阅读说明：本技术 一种激光辐照PbS量子点嵌入SnSe热电材料及其制备方法和应用 (Laser irradiation PbS quantum dot embedded SnSe thermoelectric material and preparation method and application thereof ) 是由 杨艳玲 薛帆 侯小江 锁国权 冯雷 叶晓慧 张荔 和茹梅 刘佳隽 于 2021-07-15 设计创作，主要内容包括：本发明公开了一种激光辐照PbS量子点嵌入SnSe热电材料及其制备方法和应用,属于热电材料与器件技术领域。所述制备方法包括：将PbS均匀分散于溶剂中得到溶液A,将溶液A在超声中通过非聚焦激光器辐照处理得到溶液B；将SnCl-(2)·2H-(2)O均匀分散于溶剂中得到溶液C,将NaSeO-(3)均匀分散于溶液C中得到溶液D；将溶液B和溶液D混合均匀得到溶液E,将NaOH均匀分散于溶液E中后进行溶剂热反应,将所得产物体系经清洗后干燥得到固体产物；将固体产物通过放电等离子烧结压制处理,制得激光辐照PbS量子点嵌入SnSe热电材料。制得的激光辐照PbS量子点嵌入SnSe热电材料提高了电导率和塞贝克系数,能够应用于制备深空航天器超长寿命电源或用于制备自供电无限传感器等应用场合。(The invention discloses a laser irradiation PbS quantum dot embedded SnSe thermoelectric material and a preparation method and application thereof, belonging to the technical field of thermoelectric materials and devices. The preparation method comprises the following steps: uniformly dispersing PbS in a solvent to obtain a solution A, and carrying out irradiation treatment on the solution A in ultrasound by a non-focused laser to obtain a solution B; SnCl 2 ·2H 2 Dispersing O in solvent to obtain solution C, and adding NaSeO 3 Uniformly dispersing the solution D in the solution C to obtain a solution D; uniformly mixing the solution B and the solution D to obtain a solution E, uniformly dispersing NaOH in the solution E, carrying out a solvothermal reaction, cleaning an obtained product system, and drying to obtain a solid product; and (3) performing discharge plasma sintering and pressing treatment on the solid product to prepare the laser irradiation PbS quantum dot embedded SnSe thermoelectric material. The prepared laser irradiation PbS quantum dot embedded SnSe thermoelectric material improves the conductivity and the Seebeck coefficient, and can be applied to the preparation of deep space spaceflightThe device has an ultra-long service life power supply or is used for preparing self-powered infinite sensors and other application occasions.)

1. A preparation method of a PbS quantum dot embedded SnSe thermoelectric material by laser irradiation is characterized by comprising the following steps:

1) uniformly dispersing PbS in a solvent to obtain a solution A, and carrying out irradiation treatment on the obtained solution A in ultrasound by using a non-focused laser to obtain a solution B; SnCl₂·2H₂Dispersing O in solvent to obtain solution C, and adding NaSeO₃Uniformly dispersing in the obtained solution C to obtain a solution D;

2) uniformly mixing the obtained solution B and the obtained solution D to obtain a solution E, and uniformly dispersing NaOH in the obtained solution E to obtain a solution F;

3) carrying out solvothermal reaction on the obtained solution F to obtain a product system, and cleaning and drying the obtained product system to obtain a solid product;

4) and (3) performing discharge plasma sintering and pressing treatment on the obtained solid product to obtain the laser irradiation PbS quantum dot embedded SnSe thermoelectric material.

2. The method for preparing the SnSe thermoelectric material embedded with the laser-irradiated PbS quantum dots according to claim 1, wherein PbS and SnCl are adopted₂·2H₂O、NaSeO₃And the feeding proportion of NaOH is 0.1-0.3 g: 0.5-2.5 g: 1.0-2.0 g: 3-5 g.

3. The preparation method of the laser irradiation PbS quantum dot embedded SnSe thermoelectric material as claimed in claim 1, wherein the feeding ratio of PbS and solvent is 0.1-0.3 g: 10mL of SnCl₂·2H₂The feeding proportion of the O and the solvent is 0.5-2.5 g: 40 mL.

4. The method for preparing the SnSe thermoelectric material embedded with the laser-irradiated PbS quantum dots according to claim 1, wherein the operating parameters of the unfocused laser irradiation treatment comprise: irradiating for 5-15 min, wherein the frequency of a laser is 10Hz, the wavelength is 1064nm, and the power is 300-800 mJ.

5. The method for preparing the SnSe thermoelectric material embedded with the PbS quantum dots through laser irradiation according to claim 1, wherein the conditions of the solvothermal reaction comprise: 200-230 ℃ for 24-36 h.

6. The method for preparing the SnSe thermoelectric material embedded with the laser-irradiated PbS quantum dots according to claim 1, wherein in the step 1), the solvent is ethylene glycol;

in step 3), the operation of cleaning and drying specifically comprises: washing with deionized water and ethanol for three times respectively, and vacuum drying at 80 deg.C.

7. The method for preparing the SnSe thermoelectric material embedded with the laser-irradiated PbS quantum dots according to claim 1, wherein the operating parameters of the spark plasma sintering pressing process comprise: the time is 5-8 min, and the pressure is 50-70 MPa.

8. The PbS quantum dot embedded SnSe thermoelectric material prepared by the preparation method of any one of claims 1 to 7 through laser irradiation.

9. The use of the laser-irradiated PbS quantum dot-embedded SnSe thermoelectric material of claim 8 for preparing an ultra-long-life power supply of a deep space spacecraft.

10. Use of a laser irradiated PbS quantum dot embedded SnSe thermoelectric material as defined in claim 8 for the preparation of self-powered infinite sensors.

Technical Field

The invention belongs to the technical field of thermoelectric materials and devices, and relates to a PbS quantum dot embedded SnSe thermoelectric material irradiated by laser, and a preparation method and application thereof.

Background

The thermoelectric material can realize the interconversion between heat energy and electric energy, and provides a brand new way for solving the energy crisis and environmental problems. The thermoelectric material can be divided into low-temperature thermoelectric materials (300K-500K, such as Bi) according to the temperature₂Te₃，Bi₂Te_2.7Se_0.3，NiSe_2+xEtc.), medium temperature thermoelectric materials (500K-900K, such as SnSe, SnTe, Cu₂Se and SnSe_{1- x}S_xEtc.) and high temperature thermoelectric materials (> 900K, e.g., SnSe, SiGe, etc.). Among them, as a typical representative of medium-high temperature thermoelectric materials, SnSe and its related thermoelectric materials are receiving wide attention due to advantages such as inherent thermal conductivity and high power factor.

The SnSe crystal of the layered structure shows strong anisotropy due to the phase transition at high temperature; the energy band structure is complex, and multiple local valence bands with small energy difference are provided; has higher Seebeck coefficient and extremely low thermal conductivity. However, single crystal SnSe has poor mechanical properties, severe growth conditions and difficult control, and is not suitable for commercial production, and thus, polycrystalline SnSe thermoelectric materials have been the focus of attention of researchers. At present, researchers improve thermoelectric properties of polycrystalline SnSe materials through means of doping, alloying, microstructure regulation, compound formation and the like. The polycrystalline SnSe thermoelectric material has low electrical conductivity although the polycrystalline SnSe thermoelectric material keeps low thermal conductivity and high Seebeck coefficient, thereby limiting the use of the polycrystalline SnSe thermoelectric material as a thermoelectric material. Therefore, the selection of a proper preparation method has great significance for developing a polycrystalline SnSe-based thermoelectric material which is green, environment-friendly, stable in structure and excellent in thermoelectric property.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a PbS quantum dot embedded SnSe thermoelectric material irradiated by laser, a preparation method and application thereof, which are used for improving the electrical conductivity of the SnSe material and further improving the Seebeck coefficient of the PbS/SnSe composite material.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

the invention discloses a preparation method of a PbS quantum dot embedded SnSe thermoelectric material by laser irradiation, which comprises the following steps:

1) uniformly dispersing PbS in a solvent to obtain a solution A, and carrying out irradiation treatment on the obtained solution A in ultrasound by using a non-focused laser to obtain a solution B; SnCl₂·2H₂Dispersing O in solvent to obtain solution C, and adding NaSeO₃Uniformly dispersing in the obtained solution C to obtain a solution D; 2) uniformly mixing the obtained solution B and the obtained solution D to obtain a solution E, and uniformly dispersing NaOH in the obtained solution E to obtain a solution F; 3) carrying out solvothermal reaction on the obtained solution F to obtain a product system, and cleaning and drying the obtained product system to obtain a solid product; 4) and (3) performing discharge plasma sintering and pressing treatment on the obtained solid product to obtain the P laser irradiation PbS quantum dot embedded SnSe thermoelectric material.

Preferably PbS, SnCl₂·2H₂O、NaSeO₃And the feeding proportion of NaOH is 0.1-0.3 g: 0.5-2.5 g: 1.0-2.0 g: 3-5 g.

Preferably, the feeding proportion of the PbS and the solvent is 0.1-0.3 g: 10mL of SnCl₂·2H₂The feeding proportion of the O and the solvent is 0.5-2.5 g: 40 mL.

Preferably, the operating parameters of the unfocused laser irradiation treatment include: irradiating for 5-15 min, wherein the frequency of a laser is 10Hz, the wavelength is 1064nm, and the power is 300-800 mJ.

Preferably, the conditions of the solvothermal reaction include: 200-230 ℃ for 24-36 h.

Preferably, in step 1), the solvent is ethylene glycol.

Preferably, in step 3), the operation of washing and drying specifically includes: washing with deionized water and ethanol for three times respectively, and vacuum drying at 80 deg.C.

Preferably, the operating parameters of the spark plasma sintering pressing process include: the time is 5-8 min, and the pressure is 50-70 MPa.

The invention also discloses the PbS quantum dot embedded SnSe thermoelectric material prepared by the preparation method through laser irradiation.

The invention also discloses application of the laser irradiation PbS quantum dot embedded SnSe thermoelectric material in preparation of a power supply with ultra-long service life of a deep space spacecraft.

The invention also discloses an application of the laser irradiation PbS quantum dot embedded SnSe thermoelectric material in preparation of a self-powered infinite sensor.

Compared with the prior art, the invention has the following beneficial effects:

the preparation method of the PbS quantum dot embedded SnSe thermoelectric material through laser irradiation adopts the pulse laser and the solvothermal method to prepare the PbS/SnSe composite material, and has the advantages of simple synthesis process and easy operation.

Furthermore, quantum dots PbS are easier to coat in the SnSe microstructure, and nano-scale PbS is easier to improve the conductivity of the PbS/SnSe composite material.

Furthermore, the SnSe is used as a carrier of the PbS quantum dots, so that the nano particles can be uniformly distributed on the surface of the SnSe, and the problem that the PbS quantum dots are easy to agglomerate is solved.

Furthermore, the change of the SnSe appearance can increase the contact of the grain boundary and can improve the Seebeck coefficient of the system to a certain extent.

The laser irradiation PbS quantum dots prepared by the preparation method are embedded into the SnSe thermoelectric material, and the electrical conductivity of the PbS/SnSe composite material is improved by preparing the PbS quantum dots. In addition, the basic morphology of SnSe can be changed by the recombination of the PbS quantum dots, so that the Seebeck coefficient of the composite material is further improved.

The laser irradiation PbS quantum dot embedded SnSe thermoelectric material provided by the invention can be applied to the application occasions of preparing an ultra-long service life power supply of a deep space spacecraft or preparing a self-powered infinite sensor and the like. In conclusion, the PbS/SnSe thermoelectric material prepared by the invention has the advantages of simple synthesis process and easy operation, and the prepared PbS quantum dots effectively improve the electrical conductivity of the PbS/SnSe thermoelectric material. The synthesized SnSe has strong crystallinity, and the morphology of the synthesized SnSe is changed, thereby being beneficial to improving the Seebeck coefficient of the material.

Drawings

FIG. 1 is a SEM image of a SnSe structure;

FIG. 2 is an SEM image of the SnSe structure after embedding quantum dots PbS in example 7;

fig. 3 is an XRD pattern of SnSe after quantum dot PbS intercalation in example 7.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The invention provides a preparation method of a PbS quantum dot embedded SnSe thermoelectric material by laser irradiation, which comprises the following steps:

step 1, mixing 0.1-0.3 g of PbS and 10mL of ethylene glycol to obtain a solution A;

step 2, irradiating the solution A for 5-15 min in ultrasound by a non-focusing laser, wherein the frequency of the laser is 10Hz, the wavelength is 1064nm, and the power is 300-800 mJ to obtain a solution B;

step 3, adding 0.5-2.5 g of SnCl₂·2H₂Mixing O with 40mL of glycol to obtain a solution C;

step 4, adding 1.0-2.0 g of NaSeO₃Mixing the solution D with the solution C to obtain a solution D;

step 5, mixing the solution B with the solution D to obtain a solution E;

step 6, mixing 3-5 g of NaOH with the solution E to obtain a solution F;

step 7, putting the solution F into a reaction kettle, and carrying out solvothermal reaction for 24-36 h at 200-230 ℃; washing the product system after reaction with deionized water and ethanol for three times respectively, and then drying the product system at 80 ℃ in vacuum to obtain a solid product;

and 8, pressing the solid product obtained in the step 7 for 5-8 min by discharge plasma sintering at the pressure of 50-70 MPa to obtain the laser irradiation PbS quantum dot embedded SnSe thermoelectric material.

The performance of the laser irradiation PbS quantum dot embedded SnSe thermoelectric material prepared by the preparation method is greatly improved compared with that of a pure phase SnSe material. The Seebeck coefficient/resistance analysis system instrument test shows that the Seebeck coefficient can reach 300-427 uV/k at 150 ℃, and the electric conductivity at the moment also reaches 24-36S/cm. Therefore, the laser irradiation PbS quantum dot embedded SnSe thermoelectric material can be well applied to the application occasions of power supplies of various sensors on transformers or power supplies of various detection monitoring sensors on industrial furnace bodies and chimneys, and the like, such as the preparation of ultra-long service life power supplies of deep space spacecraft and the preparation of self-powered infinite sensors.

The invention is described in further detail below with reference to the figures and specific embodiments.

Example 1

(1) Mixing 0.1g of PbS and 10mL of ethylene glycol to obtain a solution A;

(2) irradiating the solution A for 5min in ultrasound by a non-focusing laser with the laser frequency of 10Hz, the wavelength of 1064nm and the power of 300mJ to obtain a solution B;

(3) 1.7g of SnCl₂·2H₂Mixing O with 40mL of glycol to obtain a solution C;

(4) 1.3g of NaSeO₃Mixing the solution D with the solution C to obtain a solution D;

(5) mixing the solution B with the solution D to obtain a solution E;

(6) mixing 3g of NaOH with the solution E to obtain a solution F;

(7) putting the solution F into a reaction kettle, and carrying out solvothermal reaction for 24 hours at the temperature of 200 ℃; washing the product system after reaction with deionized water and ethanol for three times respectively, and then drying the product system at 80 ℃ in vacuum to obtain a solid product;

(8) and (3) pressing the solid product obtained in the step (7) for 5min by discharge plasma sintering at the pressure of 50MPa to prepare the laser irradiation PbS quantum dot embedded SnSe thermoelectric material.

The PbS quantum dots prepared by laser irradiation in the embodiment are embedded in the SnSe thermoelectric material, and the Seebeck coefficient/resistance analysis system instrument test shows that the Seebeck coefficient can reach 325.5uV/k at 150 ℃, and the electrical conductivity at the moment also reaches 27.4S/cm.

Example 2

(1) Mixing 0.1g of PbS and 10mL of ethylene glycol to obtain a solution A;

(2) irradiating the solution A for 5min in ultrasound by a non-focusing laser with the laser frequency of 10Hz, the wavelength of 1064nm and the power of 400mJ to obtain a solution B;

(3) 1.8g of SnCl₂·2H₂Mixing O with 40mL of glycol to obtain a solution C;

(4) 1.4g of NaSeO₃Mixing the solution D with the solution C to obtain a solution D;

(5) mixing the solution B with the solution D to obtain a solution E;

(6) mixing 3.5g of NaOH with the solution E to obtain a solution F;

(7) putting the solution F into a reaction kettle, and carrying out solvothermal reaction for 24 hours at the temperature of 200 ℃; washing the product system after reaction with deionized water and ethanol for three times respectively, and then drying the product system at 80 ℃ in vacuum to obtain a solid product;

(8) and (3) pressing the solid product obtained in the step (7) for 7min by discharge plasma sintering at the pressure of 50MPa to prepare the laser irradiation PbS quantum dot embedded SnSe thermoelectric material.

The PbS quantum dots prepared by laser irradiation in the embodiment are embedded in the SnSe thermoelectric material, and the Seebeck coefficient/resistance analysis system instrument test shows that the Seebeck coefficient can reach 407.3uV/k at 150 ℃, and the electrical conductivity at the moment also reaches 26.8S/cm.

Example 3

(1) Mixing 0.1g of PbS and 10mL of ethylene glycol to obtain a solution A;

(2) irradiating the solution A in ultrasound for 10min by a non-focusing laser, wherein the frequency of the laser is 10Hz, the wavelength is 1064nm, and the power is 300mJ to obtain a solution B;

(3) 1.9g of SnCl₂·2H₂Mixing O with 40mL of glycol to obtain a solution C;

(4) 1.5g of NaSeO₃Mixing the solution D with the solution C to obtain a solution D;

(5) mixing the solution B with the solution D to obtain a solution E;

(6) mixing 4g of NaOH with the solution E to obtain a solution F;

(7) putting the solution F into a reaction kettle, and carrying out solvothermal reaction for 30h at the temperature of 210 ℃; washing the product system after reaction with deionized water and ethanol for three times respectively, and then drying the product system at 80 ℃ in vacuum to obtain a solid product;

(8) and (3) pressing the solid product obtained in the step (7) for 5min by discharge plasma sintering at the pressure of 50MPa to prepare the laser irradiation PbS quantum dot embedded SnSe thermoelectric material.

The PbS quantum dots prepared by laser irradiation in the embodiment are embedded in the SnSe thermoelectric material, and the Seebeck coefficient/resistance analysis system instrument test shows that the Seebeck coefficient can reach 417.9uV/k at 150 ℃, and the electric conductivity at the moment also reaches 24.3S/cm.

Example 4

Step 1, mixing 0.2g of PbS and 10mL of ethylene glycol to obtain a solution A;

step 2, irradiating the solution A for 15min in ultrasound by a non-focusing laser with the laser frequency of 10Hz, the wavelength of 1064nm and the power of 500mJ to obtain a solution B;

step 3, adding 2.0g of SnCl₂·2H₂Mixing O with 40mL of glycol to obtain a solution C;

step 4, 2.0g of NaSeO₃Mixing the solution D with the solution C to obtain a solution D;

step 5, mixing the solution B with the solution D to obtain a solution E;

step 6, mixing 5g of NaOH with the solution E to obtain a solution F;

step 7, putting the solution F into a reaction kettle, and carrying out solvothermal reaction for 28 hours at 230 ℃; washing the product system after reaction with deionized water and ethanol for three times respectively, and then drying the product system at 80 ℃ in vacuum to obtain a solid product;

and 8, pressing the solid product obtained in the step 7 for 6min by discharge plasma sintering at the pressure of 50MPa to obtain the PbS quantum dot embedded SnSe thermoelectric material through laser irradiation.

The PbS quantum dots prepared by laser irradiation in the embodiment are embedded in the SnSe thermoelectric material, and the Seebeck coefficient/resistance analysis system instrument test shows that the Seebeck coefficient can reach 426.8uV/k at 150 ℃, and the electric conductivity at the moment also reaches 35.9S/cm.

Example 5

Step 1, mixing 0.2g of PbS and 10mL of ethylene glycol to obtain a solution A;

step 2, irradiating the solution A for 10min in ultrasound by a non-focusing laser, wherein the frequency of the laser is 10Hz, the wavelength is 1064nm, and the power is 400mJ to obtain a solution B;

step 3, adding 2.1g of SnCl₂·2H₂Mixing O with 40mL of glycol to obtain a solution C;

step 4, 1.8g of NaSeO₃Mixing the solution D with the solution C to obtain a solution D;

step 5, mixing the solution B with the solution D to obtain a solution E;

step 6, mixing 4.5g of NaOH with the solution E to obtain a solution F;

step 7, putting the solution F into a reaction kettle, and carrying out solvothermal reaction for 36 hours at 220 ℃; washing the product system after reaction with deionized water and ethanol for three times respectively, and then drying the product system at 80 ℃ in vacuum to obtain a solid product;

and 8, pressing the solid product obtained in the step 7 for 6min by discharge plasma sintering at the pressure of 55MPa to obtain the PbS quantum dot embedded SnSe thermoelectric material through laser irradiation.

The PbS quantum dots prepared by laser irradiation in the embodiment are embedded in the SnSe thermoelectric material, and the Seebeck coefficient/resistance analysis system instrument test shows that the Seebeck coefficient can reach 386.4uV/k at 150 ℃, and the electrical conductivity at the moment also reaches 32.7S/cm.

Example 6

Step 1, mixing 0.1g of PbS and 10mL of ethylene glycol to obtain a solution A;

step 2, irradiating the solution A for 15min in ultrasound by a non-focusing laser with the laser frequency of 10Hz, the wavelength of 1064nm and the power of 600mJ to obtain a solution B;

step 3, adding 2.2g of SnCl₂·2H₂Mixing O with 40mL of glycol to obtain a solution C;

step 4, 1.8g of NaSeO₃Mixing the solution D with the solution C to obtain a solution D;

step 5, mixing the solution B with the solution D to obtain a solution E;

step 6, mixing 4.5g of NaOH with the solution E to obtain a solution F;

step 7, putting the solution F into a reaction kettle, and carrying out solvothermal reaction for 36 hours at 230 ℃; washing the product system after reaction with deionized water and ethanol for three times respectively, and then drying the product system at 80 ℃ in vacuum to obtain a solid product;

and 8, sintering and pressing the solid product obtained in the step 7 for 8min by using discharge plasma at the pressure of 50MPa to obtain the PbS quantum dot embedded SnSe thermoelectric material through laser irradiation.

The PbS quantum dots prepared by laser irradiation in the embodiment are embedded in the SnSe thermoelectric material, and the Seebeck coefficient/resistance analysis system instrument test shows that the Seebeck coefficient can reach 364.7uV/k at 150 ℃, and the electric conductivity at the moment also reaches 31.3S/cm.

Example 7

Step 1, mixing 0.3g of PbS and 10mL of ethylene glycol to obtain a solution A;

step 2, irradiating the solution A for 10min in ultrasound by a non-focusing laser, wherein the frequency of the laser is 10Hz, the wavelength is 1064nm, and the power is 800mJ to obtain a solution B;

step 3, adding 2.5g of SnCl₂·2H₂Mixing O with 40mL of glycol to obtain a solution C;

step 4, 2.0g of NaSeO₃Mixing the solution D with the solution C to obtain a solution D;

step 5, mixing the solution B with the solution D to obtain a solution E;

step 6, mixing 5g of NaOH with the solution E to obtain a solution F;

step 7, putting the solution F into a reaction kettle, and carrying out solvothermal reaction for 36 hours at 230 ℃; washing the product system after reaction with deionized water and ethanol for three times respectively, and then drying the product system at 80 ℃ in vacuum to obtain a solid product;

and 8, sintering and pressing the solid product obtained in the step 7 for 8min by using discharge plasma at the pressure of 70MPa to obtain the PbS quantum dot embedded SnSe thermoelectric material through laser irradiation.

The PbS quantum dots prepared by laser irradiation in the embodiment are embedded in the SnSe thermoelectric material, and the Seebeck coefficient/resistance analysis system instrument test shows that the Seebeck coefficient can reach 324.8uV/k at 150 ℃, and the electric conductivity at the moment also reaches 29.7S/cm.

Example 8

Step 1, mixing 0.25g of PbS and 10mL of ethylene glycol to obtain a solution A;

step 2, irradiating the solution A for 15min in ultrasound by a non-focusing laser, wherein the frequency of the laser is 10Hz, the wavelength is 1064nm, and the power is 700mJ to obtain a solution B;

step 3, adding 0.5g of SnCl₂·2H₂Mixing O with 40mL of glycol to obtain a solution C;

step 4, 1.0g of NaSeO₃Mixing the solution D with the solution C to obtain a solution D;

step 5, mixing the solution B with the solution D to obtain a solution E;

step 6, mixing 4.5g of NaOH with the solution E to obtain a solution F;

step 7, putting the solution F into a reaction kettle, and carrying out solvothermal reaction for 32 hours at 230 ℃; washing the product system after reaction with deionized water and ethanol for three times respectively, and then drying the product system at 80 ℃ in vacuum to obtain a solid product;

and 8, pressing the solid product obtained in the step 7 for 6min by spark plasma sintering at the pressure of 60MPa to obtain the PbS quantum dot embedded SnSe thermoelectric material through laser irradiation.

The PbS quantum dots prepared by laser irradiation in the embodiment are embedded in the SnSe thermoelectric material, and the Seebeck coefficient/resistance analysis system instrument test shows that the Seebeck coefficient can reach 413.6uV/k at 150 ℃, and the electrical conductivity at the moment also reaches 32.4S/cm.

Referring to fig. 1, it can be seen that the morphology of pure phase SnSe is a micron-sized flat plate;

referring to fig. 2, the prepared PbS/SnSe material is a micro-plate with flower shape;

referring to fig. 3, it can be known that the PbS/SnSe material prepared is phase-pure and no hetero-phase is generated.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.