CN108097981B - Au @ SnO with core-shell structure2Nanoparticles and method for preparing same - Google Patents
Au @ SnO with core-shell structure2Nanoparticles and method for preparing same Download PDFInfo
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- 239000011258 core-shell material Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002105 nanoparticle Substances 0.000 claims abstract description 94
- 239000007864 aqueous solution Substances 0.000 claims abstract description 73
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 29
- 238000002360 preparation method Methods 0.000 claims abstract description 16
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000004044 response Effects 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 87
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(I) nitrate Inorganic materials [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 18
- XOLBLPGZBRYERU-UHFFFAOYSA-N SnO2 Inorganic materials O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 11
- 229960005070 ascorbic acid Drugs 0.000 claims description 10
- 235000010323 ascorbic acid Nutrition 0.000 claims description 10
- 239000011668 ascorbic acid Substances 0.000 claims description 10
- 229910004042 HAuCl4 Inorganic materials 0.000 claims description 9
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 claims description 9
- 239000005457 ice water Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000012279 sodium borohydride Substances 0.000 claims description 7
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 2
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- 230000008859 change Effects 0.000 abstract description 3
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- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000001027 hydrothermal synthesis Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 14
- 230000008033 biological extinction Effects 0.000 description 8
- 238000003917 TEM image Methods 0.000 description 6
- 239000010931 gold Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 3
- 238000004627 transmission electron microscopy Methods 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
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- 238000002835 absorbance Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005907 cancer growth Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000013742 energy transducer activity Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000002082 metal nanoparticle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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- 238000003911 water pollution Methods 0.000 description 1
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
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Abstract
The invention discloses Au @ SnO with a core-shell structure2The preparation method of the nano-particles comprises the steps of adding hexadecyl trimethyl ammonium bromide aqueous solution and ammonia aqueous solution to adjust the pH value of a system to be 10-11 and adding SnCl on the basis of rod-shaped AuNR nano-particles4Aqueous solution is subjected to hydrothermal reaction to obtain Au @ SnO with core-shell structure2And (3) nanoparticles. The method is simple to operate, the required equipment is simple, and the Au @ SnO obtained by the method disclosed by the invention2The nano particles have better dispersibility, no aggregation accumulation phenomenon and more sensitive response to environmental change.
Description
Technical Field
The invention belongs to the field of inorganic nano materials and the field of surface plasma resonance research, and particularly relates to a core-shell structure Au @ SnO2Nanoparticles and a method for preparing the same.
Background
The noble metal nano-particles have abundant optical properties due to the localized surface plasmon resonance effect, and the optical response is changed along with the change of factors such as the composition, the appearance, the size and the like of the particles.
Gold nanoparticles are of great interest because of their stability and plastic morphology. Wherein, Au @ SnO2The core-shell nanoparticles have a wide range of applications in sensors and catalysis. It can regulate the local surface plasma resonance in the sensor, and make the gas sensor have higher sensitivity and selectivity. In the aspect of catalytic application, photon capture and active oxygen generation are enhanced, visible light catalytic performance is improved, and water pollution can be eliminated.
However, at present, Au @ SnO is synthesized2Nanoparticles have several problems: first, the synthesis yield is not high and tedious synthesis steps are required; secondly, the synthesis conditions are harsh; third, the synthesized core-shell nanoparticles are highly susceptible to severe aggregation. Therefore, in order to greatly improve Au @ SnO2The application of the nano-particles has to develop a simple Au @ SnO with higher yield2A method for synthesizing nano particles.
Disclosure of Invention
Aiming at the defects, the invention disclosesOpen Au @ SnO of core-shell structure2The method is simple to operate, adopts a water bath heating method, and can obtain Au @ SnO with different shell thicknesses by changing synthesis conditions2And (3) nanoparticles.
The technical scheme adopted by the invention is as follows:
au @ SnO with core-shell structure2A method for preparing nanoparticles, the method comprising the steps of:
s1: preparation of seed solution: adding HAuCl into hexadecyl trimethyl ammonium bromide water solution4Mixing the aqueous solution uniformly, and adding newly prepared NaBH4Keeping the ice water solution at the constant temperature of 35 ℃ for 2-5 hours to obtain a seed solution;
s2: preparation of AuNR nanoparticles: HAuCl was added to the aqueous hexadecyltrimethylammonium bromide solution in sequence4Aqueous solution, AgNO3Adding an ascorbic acid aqueous solution into the aqueous solution and the HCl solution under the stirring condition, immediately adding the seed solution prepared in the step A after the solution is reduced to be colorless, and reacting at the constant temperature of 35 ℃ for 5-24 hours to obtain a solution of AuNR nano particles;
S3：Au@SnO2preparing nano particles: centrifuging the solution of AuNR nano particles obtained in the step S2, then dispersing the solution into deionized water with the same volume, adding a hexadecyl trimethyl ammonium bromide aqueous solution, fully stirring, and standing for 5-10 min at 60 ℃; then adding an ammonia water solution to adjust the pH of the system to 10-11, and then adding SnCl4The aqueous solution was heated in a water bath at 90 ℃ and stirred to react for 35 minutes.
And centrifuging the solution of AuNR nano-particles in the step S2 to obtain the AuNR nano-particles with rod-like structures, wherein the length of the nano-rods is 60-120 nm.
In the step S1, cetyl trimethyl ammonium bromide aqueous solution and HAuCl4Aqueous solution and NaBH4The molar concentration ratio of the ice water solution is (0.08-0.15): (0.005-0.015): (0.005-0.015).
In the step S1, cetyl trimethyl ammonium bromide aqueous solution and HAuCl4Dissolving in waterLiquid, NaBH4The volume ratio of the ice water solution is 10000: (125-300): (500-1200).
In the step S2, cetyl trimethyl ammonium bromide aqueous solution and HAuCl4Aqueous solution, AgNO3The molar concentration ratio of the aqueous solution, the HCl solution and the ascorbic acid aqueous solution is (0.08-0.15): (0.005-0.015): (0.005-0.015): (0.5-1.5): 0.1.
in the step S2, cetyl trimethyl ammonium bromide aqueous solution and HAuCl4Aqueous solution, AgNO3The volume ratio of the aqueous solution, the HCl solution, the ascorbic acid aqueous solution and the seed solution is (30000-50000): (1000-2000): (300-500): (700-1000): (300-600): (50-800).
In the step S3, cetyl trimethyl ammonium bromide aqueous solution, ammonia aqueous solution and SnCl4The molar concentration ratio of the aqueous solution is (0.08-0.15): (0.05-0.15): (0.0005-0.002).
In the step S3, the solution of AuNR nanoparticles, the aqueous solution of cetyltrimethylammonium bromide, and SnCl4The volume ratio of the aqueous solution is (10-20): (3-8): (15-35).
Further, in the step S3, an aqueous ammonia solution is added to adjust the pH of the system to 10.75 at 37 ℃.
The invention also provides Au @ SnO with a core-shell structure, which is prepared according to the preparation method2Nanoparticles, Au @ SnO of said core-shell structure2The nano particles are rod-shaped nano particles with a core-shell structure.
The preparation method comprises the steps of firstly preparing rod-shaped AuNR nano particles, and then reacting the rod-shaped AuNR nano particles with SnCl in an alkaline environment under the action of a cetyl trimethyl ammonium bromide surfactant4Au @ SnO with rod-shaped core-shell structure is generated by reaction2And (3) nanoparticles. Au @ SnO of core-shell structure2The optical response wavelength of the nano-particles is obviously red-shifted compared with AuNR nano-particles.
Compared with the prior art, the invention has the following advantages:
1. the preparation method provided by the invention is simple, the reaction condition is simple, and the required equipment is simple;
2、Au@SnO2the nano particles have good dispersibility and no aggregation accumulation phenomenon;
3. au @ SnO with core-shell structure is further synthesized on the basis of rod-shaped AuNR nano particles2Nanoparticles having a high specific surface area.
Drawings
Fig. 1 is an extinction spectrum (a) and a corresponding scanning electron micrograph (B) of AuNR nanoparticles obtained in example 1 in an aqueous solution;
FIG. 2 is the Au @ SnO obtained in example 12An extinction spectrum (A) and a corresponding transmission electron micrograph (B) of the nanoparticles in the aqueous solution;
FIG. 3 is Au @ SnO2EDS mapping test results of nanoparticles;
FIG. 4 is the Au @ SnO obtained in example 22Extinction spectra of the nanoparticles in aqueous solution;
FIG. 5 is the Au @ SnO obtained in example 22Transmission electron microscopy of nanoparticles;
FIG. 6 is the Au @ SnO obtained in example 32An extinction spectrum (A) and a corresponding transmission electron micrograph (B) of the nanoparticles in the aqueous solution;
FIG. 7 shows Au @ SnO obtained in example 12Laser test schematic of nanoparticles in aqueous solution;
FIG. 8 is the Au @ SnO obtained in example 12Laser test results in nanoparticle aqueous solutions;
FIG. 9 shows Au @ SnO obtained in comparative example 12Transmission electron microscopy of nanoparticles;
FIG. 10 shows Au @ SnO obtained in comparative example 22Transmission electron microscopy of nanoparticles.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
Au @ SnO with core-shell structure2A method for preparing nanoparticles, the method comprising the steps of:
s1: preparation of seed solution: 10mL of a 0.1M aqueous CTAB solution was taken in a test tube, and 125. mu.L of 0.01M HAuCl was added4Aqueous solution, finally 900. mu.L of freshly prepared 0.01M NaBH4Evenly shaking the ice water solution, and then placing the solution in an oven at 35 ℃ for 2 hours;
s2: preparation of AuNR nanoparticles: 40mL of a 0.1M aqueous CTAB solution was taken in a beaker, and 1.75mL of 0.01M HAuCl was added4Aqueous solution, 400. mu.L of 0.01M AgNO3Adding 320 μ L of 0.1M ascorbic acid aqueous solution into 800 μ L of 1M HCl solution under stirring, immediately adding 100 μ L of the seed solution after the solution turns colorless, and placing in an oven at 35 deg.C for 12 hr; obtaining AuNR nano-particle solution; centrifuging the AuNR nano-particle solution, and measuring an extinction spectrogram and a scanning electron microscope image of the AuNR nano-particle solution in an aqueous solution, wherein as shown in figure 1, the obtained product is a rod-shaped AuNR nano-particle with the length of 50-120 nm;
S3：Au@SnO2preparing nano particles: centrifuging 15mL of the prepared AuNR nano-particle solution, then dispersing the solution into 15mL of deionized water, placing the solution in a 50mL test tube, then adding 5mL of 0.1M hexadecyl trimethyl ammonium bromide aqueous solution, fully stirring the solution, placing the solution in a 60 ℃ oven, standing the solution for 5-10 min, taking out the test tube, adding 0.1M ammonia aqueous solution to adjust the pH of the system to 10.75 at 37 ℃, and then adding 0.002M SnCl425mL of aqueous solution is heated and stirred in water bath at 90 ℃ for reaction for 35 minutes, and the Au @ SnO is obtained after centrifugation2And (3) nanoparticles.
And measuring the extinction spectrogram and the transmission electron microscope image of the nano-particles in the aqueous solution, as shown in fig. 2, wherein the obtained product is the rod-like nano-particles with the core-shell structure, and the thickness of the shell is 18-22 nm. As can be seen from the extinction spectrogram, Au @ SnO2The corresponding wavelength at the maximum absorbance of the nanoparticles was red-shifted from 762nm to 780nm compared to AuNR nanoparticles.
EDS mapping test is carried out on the obtained product, the test result is shown in figure 3, and the result shows that the obtained product is Au @ SnO2And (3) nanoparticles.
Example 2
Au @ SnO with core-shell structure2A method for preparing nanoparticles, the method comprising the steps of:
s1: preparation of seed solution: 10mL of a 0.15M aqueous CTAB solution was taken in a test tube, and 150. mu.L of 0.015M HAuCl was added4Aqueous solution, 1200. mu.L of freshly prepared 0.015M NaBH was added4Evenly shaking the ice water solution, and then placing the solution in an oven at 35 ℃ for 2 hours;
s2: preparation of AuNR nanoparticles: 50mL of a 0.08M aqueous CTAB solution was taken in a beaker, and 2.0mL of 0.012M HAuCl were added in sequence4Aqueous solution, 500. mu.L of 0.008M AgNO3Adding 500 μ L of 0.1M ascorbic acid aqueous solution into 1000 μ L of 1.3M HCl solution under stirring, immediately adding 150 μ L of the seed solution after the seed solution turns colorless, and placing in an oven at 35 deg.C for 12 hr; obtaining AuNR nano-particle solution;
S3：Au@SnO2preparing nano particles: centrifuging 20mL of the prepared AuNR nano-particle solution, then dispersing the solution into 20mL of deionized water, placing the solution in a 50mL test tube, then adding 8mL of 0.15M hexadecyl trimethyl ammonium bromide aqueous solution, fully stirring the solution, placing the solution in a 60 ℃ oven, standing the solution for 5-10 min, taking out the test tube, adding 0.1M ammonia aqueous solution to adjust the pH of the system to 10.05 at 37 ℃, and then adding 0.002M SnCl430mL of aqueous solution is heated and stirred in water bath at 90 ℃ for reaction for 35 minutes, and the Au @ SnO is obtained after centrifugation2And (3) nanoparticles.
And measuring the extinction spectrogram and the transmission electron micrograph of the product in the aqueous solution, as shown in fig. 4 and 5 respectively, and as can be seen from fig. 5, the obtained product is Au @ SnO with a core-shell structure2The shell of the nanoparticle is 10-18 nm thick. As can be seen in FIG. 4, Au @ SnO2The wavelength of the nanoparticles was red-shifted from 788nm to 806nm compared to AuNR nanoparticles.
Example 3
Au @ SnO with core-shell structure2A method for preparing nanoparticles, the method comprising the steps of:
s1: seed solutionThe preparation of (1): 10mL of 0.15M aqueous CTAB solution was taken in a test tube, and 300. mu.L of 0.005M HAuCl was added4Aqueous solution, 1200. mu.L of freshly prepared 0.015M NaBH was added4Evenly shaking the ice water solution, and then placing the solution in an oven at 35 ℃ for 2 hours;
s2: preparation of AuNR nanoparticles: 30mL of a 0.15M aqueous CTAB solution was added to a beaker, followed by 2.0mL of 0.015M HAuCl4Aqueous solution, 500. mu.L of 0.015M AgNO3Adding aqueous solution and 900 μ L of 1.5M HCl solution into 600 μ L of 0.1M ascorbic acid aqueous solution under stirring, immediately adding 200 μ L of the seed solution after the seed solution turns colorless, and placing in an oven at 35 deg.C for 12 hr; obtaining AuNR nano-particle solution;
S3：Au@SnO2preparing nano particles: centrifuging 10mL of the prepared AuNR nano-particle solution, then dispersing into 10mL of deionized water, placing into a 50mL test tube, then adding 3mL of 0.08M hexadecyl trimethyl ammonium bromide aqueous solution, fully stirring, placing into a 60 ℃ oven, standing for 5-10 min, taking out the test tube, adding 0.1M ammonia aqueous solution to adjust the pH of the system to 10.90 at 37 ℃, and then adding 0.001M SnCl435mL of aqueous solution is heated and stirred in water bath at 90 ℃ for reaction for 35 minutes, and the Au @ SnO is obtained after centrifugation2And (3) nanoparticles.
And measuring the extinction spectrogram and transmission electron micrograph of the product in the aqueous solution, as shown in FIG. 6, the obtained product is Au @ SnO with a core-shell structure2The thickness of the shell of the nanoparticle is 20-25 nm. As can be seen from the figure, Au @ SnO2The wavelength of the nanoparticles was red-shifted from 841nm to 860nm compared to AuNR nanoparticles.
Example 4
The Au @ SnO generated by the reaction in step S3 in example 1 was taken21mL of the nanoparticle solution was dispersed in 2mL of deionized water, and the solution was placed in a cuvette, and the temperature profile of the solution over time under laser irradiation at different wavelengths was measured on a laser, and water was used as a blank control, and the results are shown in FIG. 7 and FIG. 8. From FIG. 8, Au @ SnO can be seen2Water of nano particlesThe solution is relatively sensitive to the change of the Hanjing, the temperature of the system gradually rises along with the time extension under the irradiation of the laser with the specific wavelength, and finally a balanced temperature value is reached, wherein the larger the wavelength of the laser is, the higher the rising speed of the temperature is, and the larger the balanced temperature value is finally reached. According to the characteristics, the Au @ SnO provided by the invention2The nano-particles can be applied to the field of biomedicine and can kill and inhibit the growth of cancer cells.
Comparative example 1
Otherwise as in example 1 except that the pH of the system was adjusted to 9.5 at 37 ℃ in step S3 with 0.1M aqueous ammonia solution, the final Au @ SnO was obtained2The TEM image of the nanoparticles is shown in FIG. 9, from which it can be seen that if the pH of the system is adjusted to be outside the range disclosed in the present invention, the resultant Au @ SnO is obtained2The dispersibility of the nanoparticles is poor, and the core-shell structure is incomplete.
Comparative example 2
Otherwise as in example 1 except that the pH of the system was adjusted to 11.5 at 37 ℃ in step S3 with 0.1M aqueous ammonia solution, the final Au @ SnO was obtained2The TEM image of the nanoparticles is shown in FIG. 10, from which it can be seen that if the pH of the system is adjusted to be outside the range disclosed in the present invention, the resultant Au @ SnO is obtained2The dispersibility of the nanoparticles is poor, and the core-shell structure is incomplete.
The reference embodiment is directed to a core-shell structure Au @ SnO2The detailed description of the nanoparticles and the method for their preparation, which are given by way of illustration and not of limitation, illustrates several examples within the limits of the invention, and therefore changes and modifications within the framework of the invention are within the scope of protection of the invention.
Claims (9)
1. Au @ SnO with core-shell structure2A method for producing nanoparticles, characterized in that the method comprises the following steps:
s1: preparation of seed solution: adding HAuCl into hexadecyl trimethyl ammonium bromide water solution4Mixing the aqueous solution uniformly, and adding newly prepared NaBH4Ice water solution at constant temperature of 35 deg.CKeeping for 2-5h to obtain a seed solution;
s2: preparation of AuNR nanoparticles: HAuCl was added to the aqueous hexadecyltrimethylammonium bromide solution in sequence4Aqueous solution, AgNO3Adding an ascorbic acid aqueous solution into the aqueous solution and the HCl solution under the stirring condition, immediately adding the ascorbic acid aqueous solution into the seed solution prepared in the step S1 after the solution is reduced to be colorless, and reacting at the constant temperature of 35 ℃ for 5-24 hours to obtain a solution of AuNR nano particles;
S3：Au@SnO2preparing nano particles: centrifuging the solution of AuNR nano particles obtained in the step S2, then dispersing the solution into deionized water with the same volume, adding a hexadecyl trimethyl ammonium bromide aqueous solution, fully stirring, and standing for 5-10 min at 60 ℃; then adding an ammonia water solution to adjust the pH of the system to 10-11, and then adding SnCl4Heating the aqueous solution in water bath at 90 ℃ and stirring for reaction for 35 minutes;
and centrifuging the solution of AuNR nano-particles in the step S2 to obtain the AuNR nano-particles with rod-like structures, wherein the length of the nano-rods is 50-120 nm.
2. The method according to claim 1, wherein in step S1, the solution of cetyltrimethylammonium bromide in water, HAuCl4Aqueous solution and NaBH4The molar concentration ratio of the ice water solution is (0.08-0.15): (0.005-0.015): (0.005-0.015).
3. The method according to claim 1 or 2, wherein in the step S1, cetyltrimethylammonium bromide aqueous solution, HAuCl4Aqueous solution, NaBH4The volume ratio of the ice water solution is 10000: (125-300): (500-1200).
4. The method according to claim 1, wherein in step S2, the solution of cetyltrimethylammonium bromide in water, HAuCl4Aqueous solution, AgNO3The molar concentration ratio of the aqueous solution, the HCl solution and the ascorbic acid aqueous solution is (0.08-0.15): (0.005 to 0.0)15）：（0.005~0.015）：（0.5~1.5）：0.1。
5. The method according to claim 1 or 4, wherein in step S2, cetyltrimethylammonium bromide in water, HAuCl4Aqueous solution, AgNO3The volume ratio of the aqueous solution, the HCl solution, the ascorbic acid aqueous solution and the seed solution is (30000-50000): (1000-2000): (300-500): (700-1000): (300-600): (50-800).
6. The method according to claim 1, wherein in step S3, the solution of cetyltrimethylammonium bromide, the solution of ammonia and SnCl4The molar concentration ratio of the aqueous solution is (0.08-0.15): (0.05-0.15): (0.0005-0.002).
7. The method according to claim 1 or 6, wherein in the step S3, the solution of AuNR nanoparticles, the aqueous solution of cetyltrimethylammonium bromide and SnCl4The volume ratio of the aqueous solution is (10-20): (3-8): (15-35).
8. Au @ SnO with core-shell structure prepared by preparation method according to claim 12Nanoparticles, characterized in that the core-shell structure Au @ SnO2The nano particles are rod-shaped nano particles with a core-shell structure.
9. Au @ SnO core-shell structure according to claim 82Nanoparticles, characterized in that the core-shell structure Au @ SnO2The optical response wavelength of the nano-particles is obviously red-shifted compared with AuNR nano-particles.
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