CN105478744A - Gold-bismuth sulfide nanometer heterostructure photothermal conversion material and preparing method thereof - Google Patents
Gold-bismuth sulfide nanometer heterostructure photothermal conversion material and preparing method thereof Download PDFInfo
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Abstract
The invention provides a gold-bismuth sulfide nanometer heterostructure photothermal conversion material and a preparing method thereof and relates to the nanometer heterostructure photothermal conversion material and the preparing method thereof. The gold-bismuth sulfide nanometer heterostructure photothermal conversion material and the manufacturing method aim at solving the problems that the photothermal performance and biological safety of existing developed photothermal conversion materials such as indocyanine green, polyaniline, carbon nano tubes, graphene and gold nanoparticles still need to be improved and the synthetic process is complex. The method includes the steps that bismuth salt and a surface protecting agent are dissolved in a solvent, subjected to water bath ultrasonic treatment and evenly mixed; the mixture is subjected to inert gas removal treatment and slowly heated to 100 DEG C to 250 DEG C, and mixed liquid containing a sulfur source and a gold source is added; after the reaction is finished, the mixture is cooled to the room temperature and washed multiple times in a centrifugal separation manner; and water-soluble high-molecular polymer is added and subjected to water-soluble modification, and the gold-bismuth-sulfide nanometer material with the diameter ranging from 20 nm to 200 nm is obtained.
Description
Technical field
The present invention relates to nano-heterogeneous structure optical-thermal conversion material and preparation method thereof.
Background technology
Malignant tumour (cancer), due to its extremely strong metastatic and infectivity, has become the second largest fatal disease threatening human life health at present, and its incidence of disease keeps the trend that rises year by year.Although had a lot for the treatment of technologies to be developed be used for the treatment of cancer, the survival rate of cancer patient only improve only about 10%.At present, the result for the treatment of of the methods such as traditional operation, chemotherapy and radiation is very limited and side effect is very large, and phase (particularly Advanced Carcinoma Patient) is difficult to obtain desirable result for the treatment of after the treatment to make it.Therefore, how can significantly improve cancer cure rate and reduce treatment toxic and side effect is problem demanding prompt solution.Photo-thermal therapy is the one novel Wicresoft treating malignant tumor technology grown up in the last few years, and this method is called as " green remedy ".Its action principle utilizes low dose of photothermal deformation nano material that the luminous energy of absorption is converted to heat energy effectively, heats tumor tissues, thus make the rising of tumor tissues local temperature kill tumour cell.When tumor tissues temperature reaches more than 42 DEG C, tumour cell starts Apoptosis occurs; Produce irreversible photo-thermal melt and cause the necrosis of tumor tissues.
Desirable optical-thermal conversion material should have following character: near infrared light region, (650nm ~ 950nm) has stronger absorption, higher photo-thermal conversion efficiency, good water solubility and hypotoxicity.At present, the near-infrared optical-thermal conversion material of main research is mainly divided into organic optical-thermal conversion material and inorganic optical-thermal conversion material.Organic optical-thermal conversion material mainly refers to that traditional organic nir dye is as CG, polyaniline etc.; Inorganic optical-thermal conversion material mainly refers to carbon nanomaterial (as CNT, Graphene, reproducibility Graphene) and gold nano-material (as gold nanorods, gold nanoshell and gold nanometer cage) etc.Although these optical-thermal conversion materials have achieved the progress attracted people's attention, they have had a lot of limitation in concrete biomedical applications, such as " thawing effect ", biosafety issues, lacks clinical testing, material expensive, needs relative complex and strict building-up process etc.In addition, the kind of these materials is still more limited.Therefore, the photothermal deformation nano material of development of new is used for the study hotspot that oncotherapy is people.
Summary of the invention
The present invention will solve its light thermal property of optical-thermal conversion material that existing CG, polyaniline, CNT, Graphene and gold nano-material etc. developed and biological safety has much room for improvement, and the problem of building-up process complexity, and a kind of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material and preparation method thereof is provided.
A kind of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material, gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material particle diameter is 20nm ~ 200nm, and photo-thermal conversion efficiency reaches 15% ~ 30%.
A preparation method for gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material, specifically carries out according to following steps:
One, bismuth salt and surface protectant are dissolved in a solvent, be ultrasonic in the water-bath of 10 DEG C ~ 50 DEG C mixing in temperature, obtain reactant mixture;
The quality of described bismuth salt and the volume ratio of surface protectant are 1g:(2 ~ 20) mL; The quality of described bismuth salt and the volume ratio of solvent are 1g:(40 ~ 150) mL;
Two, inert gas is utilized by reactant mixture to carry out degassed, obtain degassed after reactant mixture, with heating rate be 2 DEG C/min ~ 20 DEG C/min, reactant mixture after degassed is heated to 100 DEG C ~ 250 DEG C, then be under the condition of 100 DEG C ~ 250 DEG C in temperature, sulphur source solution and golden source solution is added in the reactant mixture after degassed, reaction 5min ~ 60min, room temperature is cooled to after reaction, utilize organic mixed solvent centrifugation and wash 1 time ~ 5 times, it is vacuum drying under the condition of 20 DEG C ~ 120 DEG C in temperature, obtain the gold-bismuth sulfide nano material of surface protectant protection,
Described degassed after reactant mixture and the volume ratio of sulphur source solution be 1:(0.1 ~ 1.5);
The volume ratio of described sulphur source solution and golden source solution is 1:(0.1 ~ 2);
Described sulphur source solution is prepared according to the following steps: by octadecylene argon-degassed 1min ~ 10min, then add sulphur source, stir, and obtains sulphur source solution; The volume ratio in described octadecylene and sulphur source is 1:(0.01 ~ 0.25);
Described golden source solution is prepared according to the following steps, and: Jiang Jinyuan to be dissolved in oleyl amine and degassed, is heat under the condition of 40 DEG C ~ 80 DEG C, until solution becomes claret, obtains golden source solution after degassed in temperature; The quality of described Jin Yuan and the volume ratio of oleyl amine are 1g:(30 ~ 200) mL;
Three, gold-bismuth sulfide nano material that surface protectant is protected is dissolved in chloroform, then the aqueous solution containing high molecular weight water soluble polymer that concentration is 150g/L ~ 300g/L is added, be stirring reaction 12h ~ 36h in the oil bath of 30 DEG C ~ 60 DEG C in temperature, utilize cleaning solvent centrifugal after stirring reaction and wash, in last disperse water, obtain gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material;
The quality of gold-bismuth sulfide nano material and the volume ratio of chloroform of described surface protectant protection are 1g:(1500 ~ 3000) mL; Gold-the bismuth sulfide nano material of described surface protectant protection is 1:(200 ~ 400 with the mass ratio of the aqueous solution containing high molecular weight water soluble polymer).
The invention has the beneficial effects as follows:
(1) preparation process of nano material is simple;
(2) size of nano material can freely control, and can change the size of nano material by changing temperature needed for reaction and reaction time simply, particle diameter is 20nm ~ 200nm;
(3) the nano material uniform particle diameter of gained, through water soluble polymer be converted to water-soluble after, in aqueous dispersed better, can steady in a long-termly in aqueous exist;
(4) nano material of gained has higher photo-thermal conversion efficiency (15% ~ 30%) and photo and thermal stability.
The present invention is used for a kind of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material and preparation method thereof.
Accompanying drawing explanation
Fig. 1 is the TEM figure of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one;
Fig. 2 is the SEM figure of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one;
Fig. 3 is the XRD collection of illustrative plates of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one;
Fig. 4 is the energy spectrum analysis figure of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one;
Fig. 5 is FTIR spectrum; The Au-Bi of the 1 oleyl amine protection prepared for embodiment one step 2
2s
3nano material, 2 is PVP, and 3 is gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one;
Fig. 6 is the ultra-violet absorption spectrum of variable concentrations gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution; 1 for concentration be 20ug/mL, 2 for concentration be 40ug/mL, 3 for concentration be 60ug/mL, 4 for concentration be 80ug/mL, 5 for concentration be 100ug/mL;
Fig. 7 is the Linear Fit Chart of variable concentrations gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution 808nm place absorption value;
Fig. 8 is variable concentrations gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution photo-thermal heating curve figure, 1 for concentration be 0 μ g/mL, 2 for concentration be 10 μ g/mL, 3 for concentration be 50 μ g/mL, 4 for concentration be 100 μ g/mL, 5 for concentration be 200 μ g/mL, 6 for concentration be 400 μ g/mL;
Fig. 9 is variable concentrations gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution photo-thermal intensification temperature difference figure;
Figure 10 is deionized water, gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution photo-thermal heats up and cooling chart; 1 is deionized water, and 2 is the gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution of 100 μ g/mL;
Figure 11 is gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution laser shutdown cooling stage time constant (τ
s) fitted figure;
Figure 12 is the photo-thermal ramp cycle figure of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material, and 1 for closing laser instrument, and 2 for opening laser instrument.
Detailed description of the invention
Technical solution of the present invention is not limited to following cited detailed description of the invention, also comprises any combination between each detailed description of the invention.
Detailed description of the invention one: the one gold described in present embodiment-bismuth sulfide nano heterojunction structure optical-thermal conversion material, gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material particle diameter is 20nm ~ 200nm, and photo-thermal conversion efficiency reaches 15% ~ 30%.
Detailed description of the invention two: the preparation method of a kind of gold described in present embodiment-bismuth sulfide nano heterojunction structure optical-thermal conversion material, specifically carry out according to following steps:
One, bismuth salt and surface protectant are dissolved in a solvent, be ultrasonic in the water-bath of 10 DEG C ~ 50 DEG C mixing in temperature, obtain reactant mixture;
The quality of described bismuth salt and the volume ratio of surface protectant are 1g:(2 ~ 20) mL; The quality of described bismuth salt and the volume ratio of solvent are 1g:(40 ~ 150) mL;
Two, inert gas is utilized by reactant mixture to carry out degassed, obtain degassed after reactant mixture, with heating rate be 2 DEG C/min ~ 20 DEG C/min, reactant mixture after degassed is heated to 100 DEG C ~ 250 DEG C, then be under the condition of 100 DEG C ~ 250 DEG C in temperature, sulphur source solution and golden source solution is added in the reactant mixture after degassed, reaction 5min ~ 60min, room temperature is cooled to after reaction, utilize organic mixed solvent centrifugation and wash 1 time ~ 5 times, it is vacuum drying under the condition of 20 DEG C ~ 120 DEG C in temperature, obtain the gold-bismuth sulfide nano material of surface protectant protection,
Described degassed after reactant mixture and the volume ratio of sulphur source solution be 1:(0.1 ~ 1.5);
The volume ratio of described sulphur source solution and golden source solution is 1:(0.1 ~ 2);
Described sulphur source solution is prepared according to the following steps: by octadecylene argon-degassed 1min ~ 10min, then add sulphur source, stir, and obtains sulphur source solution; The volume ratio in described octadecylene and sulphur source is 1:(0.01 ~ 0.25);
Described golden source solution is prepared according to the following steps, and: Jiang Jinyuan to be dissolved in oleyl amine and degassed, is heat under the condition of 40 DEG C ~ 80 DEG C, until solution becomes claret, obtains golden source solution after degassed in temperature; The quality of described Jin Yuan and the volume ratio of oleyl amine are 1g:(30 ~ 200) mL;
Three, gold-bismuth sulfide nano material that surface protectant is protected is dissolved in chloroform, then the aqueous solution containing high molecular weight water soluble polymer that concentration is 150g/L ~ 300g/L is added, be stirring reaction 12h ~ 36h in the oil bath of 30 DEG C ~ 60 DEG C in temperature, utilize cleaning solvent centrifugal after stirring reaction and wash, in last disperse water, obtain gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material;
The quality of gold-bismuth sulfide nano material and the volume ratio of chloroform of described surface protectant protection are 1g:(1500 ~ 3000) mL; Gold-the bismuth sulfide nano material of described surface protectant protection is 1:(200 ~ 400 with the mass ratio of the aqueous solution containing high molecular weight water soluble polymer).
The beneficial effect of present embodiment is:
(1) preparation process of nano material is simple;
(2) size of nano material can freely control, and can change the size of nano material by changing temperature needed for reaction and reaction time simply, particle diameter is 20nm ~ 200nm;
(3) the nano material uniform particle diameter of gained, through water soluble polymer be converted to water-soluble after, in aqueous dispersed better, can steady in a long-termly in aqueous exist;
(4) nano material of gained has higher photo-thermal conversion efficiency (15% ~ 30%) and photo and thermal stability.
Detailed description of the invention three: present embodiment and detailed description of the invention two unlike: the bismuth salt described in step one is a kind of or wherein several mixture in bismuth acetate, bismuth nitrate, waltherite, bismuth citrate and bismuth subsalicylate.Other is identical with detailed description of the invention two.
Detailed description of the invention four: one of present embodiment and detailed description of the invention two or three are one or both the mixture in oleyl amine and oleic acid unlike: the surface protectant described in step one.Other is identical with detailed description of the invention two or three.
Detailed description of the invention five: one of present embodiment and detailed description of the invention two to four unlike: the solvent described in step one is a kind of or wherein several mixture in octadecylene, hexadecylene, tetradecene and polypropylene tetramer.Other is identical with detailed description of the invention two to four.
Detailed description of the invention six: one of present embodiment and detailed description of the invention two to five are one or both the mixture in argon gas and nitrogen unlike: the inert gas described in step 2.Other is identical with detailed description of the invention two to five.
Detailed description of the invention seven: one of present embodiment and detailed description of the invention two to six are one or both the mixture in hexamethyldisilathiane and thioacetamide unlike: the sulphur source described in step 2.Other is identical with detailed description of the invention two to six.
Detailed description of the invention eight: one of present embodiment and detailed description of the invention two to seven unlike: the Jin Yuan described in step 2 is a kind of or wherein several mixture in gold chloride, gold trichloride and potassium auricyanide.Other is identical with detailed description of the invention two to seven.
Detailed description of the invention nine: one of present embodiment and detailed description of the invention two to eight unlike: the organic mixed solvent described in step 2 is the mixed liquor of chloroform and acetone, and described chloroform and the volume ratio of acetone are 1:(0.5 ~ 2).Other is identical with detailed description of the invention two to eight.
Detailed description of the invention ten: one of present embodiment and detailed description of the invention two to nine unlike: the cleaning solvent described in step 3 is a kind of of ethanol, methyl alcohol, ethylene glycol and deionized water or wherein several mixtures.Other is identical with detailed description of the invention two to nine.
Following examples are adopted to verify beneficial effect of the present invention:
Embodiment one:
The preparation method of a kind of gold described in the present embodiment-bismuth sulfide nano heterojunction structure optical-thermal conversion material, specifically carries out according to following steps:
One, bismuth salt and surface protectant are dissolved in a solvent, be ultrasonic in the water-bath of 25 DEG C mixing in temperature, obtain reactant mixture;
The quality of described bismuth salt and the volume ratio of surface protectant are 1g:8.1mL; The quality of described bismuth salt and the volume ratio of solvent are 1g:73.5mL;
Two, inert gas is utilized to carry out reactant mixture degassed; obtain degassed after reactant mixture; be 10 DEG C/min with heating rate, the reactant mixture after degassed is heated to 190 DEG C, is then under the condition of 190 DEG C in temperature; sulphur source solution and golden source solution is added in the reactant mixture after degassed; reaction 30min, is cooled to room temperature after reaction, utilizes organic mixed solvent centrifugation and wash 3 times; be vacuum drying under the condition of 30 DEG C in temperature, obtain the Au-Bi of oleyl amine protection
2s
3nano material;
Described degassed after reactant mixture and the volume ratio of sulphur source solution be 1:0.1;
The volume ratio of described sulphur source solution and golden source solution is 1:0.48;
Described sulphur source solution is prepared according to the following steps: by octadecylene argon-degassed 3min, then add sulphur source, stir, and obtains sulphur source solution; The volume ratio in described octadecylene and sulphur source is 1:0.05;
Described golden source solution is prepared according to the following steps, and: Jiang Jinyuan to be dissolved in oleyl amine and degassed, is heat under the condition of 60 DEG C, until solution becomes claret, obtains golden source solution after degassed in temperature; The quality of described Jin Yuan and the volume ratio of oleyl amine are 1g:122mL;
Three, by the Au-Bi of oleyl amine protection
2s
3nano material is dissolved in chloroform, then add the aqueous solution containing PVP that concentration is 0.244g/mL, be stirring reaction 24h in the oil bath of 40 DEG C in temperature, utilize cleaning solvent centrifugal after stirring reaction and wash, in last disperse water, obtain gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material;
The Au-Bi of described oleyl amine protection
2s
3the quality of nano material and the volume ratio of chloroform are 1g:2000mL; The Au-Bi of described oleyl amine protection
2s
3nano material is 1:366 with the mass ratio of the aqueous solution containing PVP.
Bismuth salt described in step one is bismuth acetate;
Surface protectant described in step one is oleyl amine;
Solvent described in step one is octadecylene;
Inert gas described in step 2 is argon gas;
Sulphur source described in step 2 is hexamethyldisilathiane;
Jin Yuan described in step 2 is gold chloride;
Organic mixed solvent described in step 2 is the mixed liquor of chloroform and acetone, and described chloroform and the volume ratio of acetone are 1:1;
Cleaning solvent described in step 3 is ethanol.
Fig. 1 is the TEM figure of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one; Fig. 2 is the SEM figure of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one; As seen from the figure, Au-Bi
2s
3the shape of nano particle is homogeneous sheet or pie, and particle diameter is about 70nm ~ 80nm.
Fig. 3 is the XRD collection of illustrative plates of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one; As seen from the figure, sample crystalline state is good.
Fig. 4 is the energy spectrum analysis figure of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one; As seen from the figure, the existence of Au, Bi, S element in material.
Fig. 5 is FTIR spectrum; The Au-Bi of the 1 oleyl amine protection prepared for embodiment one step 2
2s
3nano material; 2 is PVP, and 3 is gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material prepared by embodiment one; As seen from the figure, successfully achieve Au-Bi
2s
3the PVP finishing of nano material, employing said method carries out the Au-Bi that PVP modification obtains
2s
3nano material, can be easy to dispersion in deionized water.
Fig. 6 is the ultra-violet absorption spectrum of variable concentrations gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution; 1 for concentration be 20ug/mL, 2 for concentration be 40ug/mL, 3 for concentration be 60ug/mL, 4 for concentration be 80ug/mL, 5 for concentration be 100ug/mL; Fig. 7 is the Linear Fit Chart of variable concentrations gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution 808nm place absorption value; As seen from the figure, Au-Bi
2s
3nano material has stronger absorption near infrared region, and along with the rising of solution concentration, it also increases near infrared absorption value.
To gold-bismuth sulfide (Au-Bi prepared by the present embodiment
2s
3) nano-heterogeneous structure optical-thermal conversion material carry out photo-thermal heat up test:
Gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution concentration being respectively 0 μ g/mL, 10 μ g/mL, 50 μ g/mL, 100 μ g/mL, 200 μ g/mL and 400 μ g/mL is all got 1mL and is placed in cuvette, is 2W/cm with power
2808nm laser irradiate 10min, detect the solution of this series of variable concentrations with thermocouple at ramp case during this period of time.As shown in Figure 8 and Figure 9, Fig. 8 is variable concentrations gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution photo-thermal heating curve figure, 1 for concentration be 0 μ g/mL, 2 for concentration be 10 μ g/mL, 3 for concentration be 50 μ g/mL, 4 for concentration be 100 μ g/mL, 5 for concentration be 200 μ g/mL, 6 for concentration be 400 μ g/mL; Fig. 9 is variable concentrations gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution photo-thermal intensification temperature difference figure; Result shows, Au-Bi
2s
3the nano particle aqueous solution can be rapidly heated under the irradiation of 808nm laser instrument, and along with the increase of nanoparticle concentration, temperature rise effect is more and more obvious, and this illustrates Au-Bi
2s
3nano particle has excellent photo-thermal converting function.
To gold-bismuth sulfide (Au-Bi prepared by the present embodiment
2s
3) nano-heterogeneous structure optical-thermal conversion material carries out photo-thermal conversion efficiency calculating:
Be that the 808nm laser that the gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution of 100 μ g/mL carries out 20min irradiates by the water of 1mL system and concentration, then close laser and naturally cool to room temperature, utilize the variations in temperature during thermocouple record, draw heating curve and carry out matching, calculating the photo-thermal conversion efficiency of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material.Figure 10 is deionized water, gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution photo-thermal heats up and cooling chart; 1 is deionized water, and 2 is the gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution of 100 μ g/mL; Figure 11 is gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution laser shutdown cooling stage time constant (τ
s) fitted figure; Wherein τ
s=426.0, can obtain its photo-thermal conversion efficiency is as calculated 17.4%, shows Au-Bi
2s
3luminous energy can be converted to heat energy by nano particle effectively.
To gold-bismuth sulfide (Au-Bi prepared by the present embodiment
2s
3) nano-heterogeneous structure optical-thermal conversion material carries out photo and thermal stability test.
Be the gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material aqueous solution 808nm power of 200 μ g/mL by 1mL concentration be 2W/cm
2laser irradiate 3min, turn off laser instrument, naturally cool 3min, repeat 6 times with this, utilize its variations in temperature of thermocouple record, draw out circulation heating curve.Figure 12 is the photo-thermal ramp cycle figure of gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material, and 1 for closing laser instrument, and 2 for opening laser instrument; The intensification property retention after use laser instrument irradiates repeatedly of test result display gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material is stablized, and illustrates that gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material has excellent photo and thermal stability.
Claims (10)
1. gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material, it is characterized in that gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material particle diameter is 20nm ~ 200nm, photo-thermal conversion efficiency reaches 15% ~ 30%.
2. the preparation method of a kind of gold as claimed in claim 1-bismuth sulfide nano heterojunction structure optical-thermal conversion material, is characterized in that it carries out according to following steps:
One, bismuth salt and surface protectant are dissolved in a solvent, be ultrasonic in the water-bath of 10 DEG C ~ 50 DEG C mixing in temperature, obtain reactant mixture;
The quality of described bismuth salt and the volume ratio of surface protectant are 1g:(2 ~ 20) mL; The quality of described bismuth salt and the volume ratio of solvent are 1g:(40 ~ 150) mL;
Two, inert gas is utilized by reactant mixture to carry out degassed, obtain degassed after reactant mixture, with heating rate be 2 DEG C/min ~ 20 DEG C/min, reactant mixture after degassed is heated to 100 DEG C ~ 250 DEG C, then be under the condition of 100 DEG C ~ 250 DEG C in temperature, sulphur source solution and golden source solution is added in the reactant mixture after degassed, reaction 5min ~ 60min, room temperature is cooled to after reaction, utilize organic mixed solvent centrifugation and wash 1 time ~ 5 times, it is vacuum drying under the condition of 20 DEG C ~ 120 DEG C in temperature, obtain the gold-bismuth sulfide nano material of surface protectant protection,
Described degassed after reactant mixture and the volume ratio of sulphur source solution be 1:(0.1 ~ 1.5);
The volume ratio of described sulphur source solution and golden source solution is 1:(0.1 ~ 2);
Described sulphur source solution is prepared according to the following steps: by octadecylene argon-degassed 1min ~ 10min, then add sulphur source, stir, and obtains sulphur source solution; The volume ratio in described octadecylene and sulphur source is 1:(0.01 ~ 0.25);
Described golden source solution is prepared according to the following steps, and: Jiang Jinyuan to be dissolved in oleyl amine and degassed, is heat under the condition of 40 DEG C ~ 80 DEG C, until solution becomes claret, obtains golden source solution after degassed in temperature; The quality of described Jin Yuan and the volume ratio of oleyl amine are 1g:(30 ~ 200) mL;
Three, gold-bismuth sulfide nano material that surface protectant is protected is dissolved in chloroform, then the aqueous solution containing high molecular weight water soluble polymer that concentration is 150g/L ~ 300g/L is added, be stirring reaction 12h ~ 36h in the oil bath of 30 DEG C ~ 60 DEG C in temperature, utilize cleaning solvent centrifugal after stirring reaction and wash, in last disperse water, obtain gold-bismuth sulfide nano heterojunction structure optical-thermal conversion material;
The quality of gold-bismuth sulfide nano material and the volume ratio of chloroform of described surface protectant protection are 1g:(1500 ~ 3000) mL; Gold-the bismuth sulfide nano material of described surface protectant protection is 1:(200 ~ 400 with the mass ratio of the aqueous solution containing high molecular weight water soluble polymer).
3. the preparation method of a kind of gold according to claim 2-bismuth sulfide nano heterojunction structure optical-thermal conversion material, is characterized in that the bismuth salt described in step one is a kind of or wherein several mixture in bismuth acetate, bismuth nitrate, waltherite, bismuth citrate and bismuth subsalicylate.
4. the preparation method of a kind of gold according to claim 2-bismuth sulfide nano heterojunction structure optical-thermal conversion material, is characterized in that the surface protectant described in step one is one or both the mixture in oleyl amine and oleic acid.
5. the preparation method of a kind of gold according to claim 2-bismuth sulfide nano heterojunction structure optical-thermal conversion material, is characterized in that the solvent described in step one is a kind of or wherein several mixture in octadecylene, hexadecylene, tetradecene and polypropylene tetramer.
6. the preparation method of a kind of gold according to claim 2-bismuth sulfide nano heterojunction structure optical-thermal conversion material, is characterized in that the inert gas described in step 2 is one or both the mixture in argon gas and nitrogen.
7. the preparation method of a kind of gold according to claim 2-bismuth sulfide nano heterojunction structure optical-thermal conversion material, is characterized in that the sulphur source described in step 2 is one or both the mixture in hexamethyldisilathiane and thioacetamide.
8. the preparation method of a kind of gold according to claim 2-bismuth sulfide nano heterojunction structure optical-thermal conversion material, is characterized in that the Jin Yuan described in step 2 is a kind of or wherein several mixture in gold chloride, gold trichloride and potassium auricyanide.
9. the preparation method of a kind of gold according to claim 2-bismuth sulfide nano heterojunction structure optical-thermal conversion material, it is characterized in that the organic mixed solvent described in step 2 is the mixed liquor of chloroform and acetone, described chloroform and the volume ratio of acetone are 1:(0.5 ~ 2).
10. the preparation method of a kind of gold according to claim 2-bismuth sulfide nano heterojunction structure optical-thermal conversion material, is characterized in that the cleaning solvent described in step 3 is a kind of of ethanol, methyl alcohol, ethylene glycol and deionized water or wherein several mixtures.
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