CN111036930B - Preparation method of silver nanowire block for SERS detection - Google Patents
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 239000002042 Silver nanowire Substances 0.000 title claims abstract description 49
- 238000004416 surface enhanced Raman spectroscopy Methods 0.000 title claims abstract description 44
- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 51
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 22
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 22
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 13
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 20
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 18
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 8
- 235000019441 ethanol Nutrition 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 5
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 4
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 4
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 230000001476 alcoholic effect Effects 0.000 claims description 2
- 229960002089 ferrous chloride Drugs 0.000 claims description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 2
- 239000001103 potassium chloride Substances 0.000 claims description 2
- 235000011164 potassium chloride Nutrition 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 239000002070 nanowire Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 53
- 238000005303 weighing Methods 0.000 description 12
- 239000011259 mixed solution Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 7
- 238000001069 Raman spectroscopy Methods 0.000 description 5
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000011068 loading method Methods 0.000 description 3
- 239000012488 sample solution Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008131 herbal destillate Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 210000002381 plasma Anatomy 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 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
- 239000010931 gold Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000001228 spectrum 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
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- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
- G01N21/658—Raman scattering enhancement Raman, e.g. surface plasmons
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Abstract
The invention relates to a preparation method of a silver nanowire block for SERS detection, which is characterized by comprising the following steps of: s1: adding silver nitrate into polyhydric alcohol, and stirring uniformly to obtain a solution A with the concentration of 0.01-0.3 g/mL; s2: adding polyvinylpyrrolidone into polyhydric alcohol, and stirring uniformly to obtain a solution B with the concentration of 0.02-0.2 g/mL; s3: heating the solution B to 50-80 ℃, keeping the temperature for 20-60 min, adding the solution A into the solution B while stirring, and then continuously stirring for 20-60 min to obtain a solution C; s4: adding chloride with the concentration of 0.0002-0.005 g/mL into the solution C, stirring for 5-10 min, heating at 90-140 ℃ for 8-24 h, and obtaining a nano silver wire block on the upper layer of the solution C; s5: and taking out the nano silver wire block, cleaning for 5-10 times, and drying at 40-80 ℃ for 60-120 min. The invention has the beneficial effects that: 1. the massive silver nanowires can be prepared in one step, and the preparation steps are simple; 2. the nanowire block can be directly used for SERS detection, and the use method is simple and convenient to use; and 3, the SERS performance is excellent, the SERS can be repeatedly used, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of nano silver wire manufacturing, and particularly relates to a preparation method of a silver nano wire block for SERS detection.
Background
When some molecules approach or adsorb on some rough metal surfaces, such as gold, silver, copper, etc., the raman signal generated on these surfaces can increase by 3-9 orders of magnitude, and the phenomenon like this significant enhancement of the raman signal intensity relative to the bulk molecule itself is called surface enhanced raman Scattering Effect (SERS).
This is because most metals are good conductors, and there are a large number of freely movable electrons on the surfaces of these metals, which can be excited to form a plasma when these surfaces are irradiated with a certain amount of incident light. When the frequency of the incident light is the same as the vibration frequency of these plasmas, resonance occurs. If this phenomenon occurs only in a localized area of the metal surface, it is called local plasmon resonance. In the surface region where plasmon resonance occurs, the electric field is greatly enhanced, so that the signals generated by the molecules adsorbed on these surfaces are also enhanced. Because silver has excellent conductivity and the nano-silver has large specific surface area, the nano-silver has strong adsorption capacity, so that nano-silver particles and nano-silver wires are widely applied to the research of the SERS detection field. However, the nano silver particles and the nano silver wires are difficult to collect and use independently, SERS detection is often performed by loading the nano silver particles and the nano silver wires on other substrates, the loading process is complex, and the amount of nano silver loaded on the substrates is limited. Therefore, the effect of the nano silver particles and the nano silver wires on SERS detection is limited by the loading application.
The invention patent (CN 106270550B) provides a method for preparing silver nanowires and an SERS detection method using the silver nanowires as substrates, the prepared silver nanowires are finally dispersed in water to obtain hydrosols, before SERS detection is carried out, a sample solution to be detected and the hydrosols of the silver nanowires are required to be mixed and then dripped onto a carrier for drying treatment, and SERS detection can be carried out after treatment.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a preparation method of a silver nanowire block for SERS detection; the method can prepare the required nano silver wire block in one step, and the sample solution to be detected is directly dripped on the silver wire block and then is put into a Raman instrument for SERS detection.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a silver nanowire block for SERS detection is characterized by comprising the following steps:
s1: adding silver nitrate into polyhydric alcohol, and uniformly stirring to prepare a silver nitrate alcohol solution with the concentration of 0.01-0.3 g/mL, and marking as a solution A;
s2: adding polyvinylpyrrolidone serving as a surfactant into polyhydric alcohol, and uniformly stirring to prepare an alcoholic solution of polyvinylpyrrolidone (PVP) with the concentration of 0.02-0.2 g/mL, and marking as a solution B;
s3: pouring the solution B into a container, heating to 50-80 ℃, keeping the temperature for 20-60 min, then dropwise adding the solution A into the solution B while stirring, and continuously stirring for 20-60 min after dropwise adding is finished, and marking as a solution C;
s4: adding chloride with the concentration of 0.0002-0.005 g/mL into the solution C, stirring for 5-10 min, heating at 90-140 ℃ for 8-24 h, and then obtaining an aggregated nano silver wire block on the upper layer of the solution C;
s5: and taking out the nano silver wire block, cleaning the nano silver wire block for 5-10 times by using deionized water or absolute ethyl alcohol or acetone, and drying the nano silver wire block for 60-120 min at 40-80 ℃ to obtain the SERS detection silver nano wire block.
Further, the polyol in the steps S1 and S2 is any one of ethylene glycol, glycerol, or isopropanol.
Furthermore, the molecular weight of polyvinylpyrrolidone (PVP) in the step S2 is 80000-1300000.
In step S4, the chloride is any one of copper chloride, ferric chloride, sodium chloride, ferrous chloride, magnesium chloride, potassium chloride, and the like.
The SERS detection method of the silver nanowire block prepared by the invention comprises the following steps: and (3) dripping 20 ml of sample solution to be detected onto the silver nanowire block, and directly putting the silver nanowire block on which the sample is dripped into a Raman instrument for detection.
The invention has the beneficial effects that: 1. the massive silver nanowires can be prepared in one step, and the preparation steps are simple; 2. the nanowire block can be directly used for SERS detection, and the use method is simple and convenient to use; and 3, the SERS performance is excellent, the SERS can be repeatedly used, and the cost is reduced.
Drawings
FIG. 1 is a photograph of a prepared silver nanowire block;
fig. 2 is an SEM image of the prepared silver nanowire block;
FIG. 3 is a graph of SERS detection of Crystal Violet (CV) with silver nanowire bulk;
FIG. 4 shows the spectrum of SERS detection of Crystal Violet (CV) by circulating silver nanowire blocks for different circulation times.
Detailed Description
The present invention is further described in detail in the following examples, which are intended to be illustrative rather than limiting, and that the reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise specified.
Example 1
a) Weighing 1.0 g of silver nitrate, adding the silver nitrate into 40mL of glycol solution, and performing ultrasonic stirring to obtain a uniformly mixed solution A with the mass concentration of 0.025 g/mL;
b) weighing 1.0 g of polyvinylpyrrolidone (PVP) with the molecular weight of 80000, adding the PVP into 50 mL of ethylene glycol solution, and performing ultrasonic stirring to obtain a uniformly mixed solution B with the mass concentration of 0.02 g/mL;
c) pouring the solution B into a 200mL three-neck flask, heating to 60 ℃ while stirring, preserving heat for 30 min, dropwise adding the solution A into the solution B while stirring, and continuously stirring for 30 min after dropwise adding;
d) adding 0.03g of copper chloride powder into a three-neck flask, stirring for 5 min, vertically placing the three-neck flask into an oven, heating to 110 ℃, drying for 12 h, obtaining an aggregated nano silver wire block on the upper layer of the solution in the three-neck flask, taking out the nano silver wire block, washing with deionized water for 5 times, and drying in the oven at 60 ℃ for 100min to obtain the silver nano wire block for SERS detection.
Example 2
a) Weighing 1.0 g of silver nitrate, adding the silver nitrate into 40mL of glycerol solution, and performing ultrasonic stirring to obtain a solution A with the mass concentration of 0.025 g/mL;
b) weighing 1.0 g of PVP with the molecular weight of 1300000, adding the PVP into 50 mL of glycerol solution, and performing ultrasonic stirring to obtain a uniformly mixed solution B with the mass concentration of 0.02 g/mL;
c) pouring the solution B into a 200mL three-neck flask, heating to 50 ℃ while stirring, preserving heat for 60min, dropwise adding the solution A into the solution B while stirring, and continuously stirring for 25 min after dropwise adding;
d) adding 0.03g of ferric chloride powder into a beaker, stirring for 8min, vertically placing the beaker in an oven, heating to 80 ℃, and standing for 24 h; and (3) obtaining an aggregated silver nanowire block on the upper layer of the solution in the three-neck flask, taking out the silver nanowire block, washing the silver nanowire block with alcohol for 8 times, and drying the silver nanowire block in a drying oven at the temperature of 40 ℃ for 120min to obtain the silver nanowire block for SERS detection.
Example 3
a) Weighing 1.6 g of silver nitrate, adding the silver nitrate into 40mL of isopropanol solution, and performing ultrasonic stirring to obtain a solution A with the mass concentration of 0.04 g/mL;
b) weighing 1.0 g of PVP with the molecular weight of 1000000, adding the PVP into 50 mL of isopropanol solution, and performing ultrasonic stirring to obtain a uniformly mixed solution B with the mass concentration of 0.02 g/mL;
c) pouring the solution B into a 200mL three-neck flask, heating to 80 ℃ while stirring, preserving heat for 20min, dropwise adding the solution A into the solution B while stirring, and continuously stirring for 30 min after dropwise adding;
d) adding 0.03g of copper chloride powder into a three-neck flask, stirring for 5 min, vertically placing the three-neck flask into an oven, heating to 140 ℃, and standing for 24 h; the upper layer of the solution in the three-neck flask can obtain the aggregated nano silver wire block. And taking out the nano silver wire block, washing the nano silver wire block for 5 times by using deionized water, alcohol and acetone, and then drying the nano silver wire block in a 60-DEG C drying oven for 100min to obtain the SERS detection silver nano wire block.
Example 4
a) Weighing 1.0 g of silver nitrate, adding the silver nitrate into 40mL of glycol solution, and performing ultrasonic stirring to obtain a solution A with the mass concentration of 0.025 g/mL;
b) weighing 1.0 g of PVP with the molecular weight of 80000, adding the PVP into 50 mL of glycol solution, and performing ultrasonic stirring to obtain a uniformly mixed solution B with the mass concentration of 0.02 g/mL;
c) pouring the solution B into a 200mL three-neck flask, heating to 80 ℃ while stirring, preserving heat for 20min, dropwise adding the solution A into the solution B while stirring, and continuously stirring for 30 min after dropwise adding;
d) adding 0.05 g of sodium chloride powder into a three-neck flask, stirring for 10 min, vertically placing the three-neck flask into an oven, heating to 130 ℃, and standing for 10 h; the upper layer of the solution in the three-neck flask can obtain the aggregated nano silver wire block. And taking out the nano silver wire block, washing the nano silver wire block for 8 times by using deionized water, alcohol and acetone, and then drying the nano silver wire block in a 60-DEG C drying oven for 100min to obtain the SERS detection silver nano wire block.
Example 5
a) Weighing 1.6 g of silver nitrate, adding the silver nitrate into 40mL of glycerol solution, and performing ultrasonic stirring to obtain a solution A with the mass concentration of 0.04 g/mL;
b) weighing 2.0 g of PVP with the molecular weight of 100000, adding the PVP into 50 mL of glycerol solution, and performing ultrasonic stirring to obtain a uniformly mixed solution B with the mass concentration of 0.04 g/mL;
c) pouring the solution B into a 200mL three-neck flask, heating to 60 ℃ while stirring, preserving heat for 30 min, dropwise adding the solution A into the solution B while stirring, and continuously stirring for 30 min after dropwise adding;
d) adding 0.03g of copper chloride powder into a three-neck flask, stirring for 5 min, vertically placing the three-neck flask into an oven, heating to 110 ℃, and standing for 18 h; the upper layer of the solution in the three-neck flask can obtain the aggregated nano silver wire block. And taking out the nano silver wire block, washing the nano silver wire block for 5 times by using deionized water, alcohol and acetone, and then drying the nano silver wire block in a 60-DEG C drying oven for 100min to obtain the SERS detection silver nano wire block.
Example 6
a) Weighing 1.6 g of silver nitrate, adding the silver nitrate into 40mL of ethylene glycol solution, and performing ultrasonic stirring to obtain a solution A with the mass concentration of 0.04 g/mL;
b) weighing 2.0 g of PVP with the molecular weight of 1300000, adding the PVP into 50 mL of glycol solution, and performing ultrasonic stirring to obtain a uniformly mixed solution B with the mass concentration of 0.04 g/mL;
c) pouring the solution B into a 200mL three-neck flask, heating to 60 ℃ while stirring, preserving heat for 30 min, dropwise adding the solution A into the solution B while stirring, and continuously stirring for 30 min after dropwise adding;
d) adding 0.05 g of ferric chloride powder into a three-neck flask, stirring for 5 min, vertically placing the three-neck flask into an oven, heating to 110 ℃, and standing for 12 h; the upper layer of the solution in the three-neck flask can obtain the aggregated nano silver wire block. And taking out the nano silver wire block, washing the nano silver wire block for 8 times by using deionized water, alcohol and acetone, and drying the nano silver wire block in an oven at the temperature of 80 ℃ for 60min to obtain the SERS detection silver nano wire block.
The SERS detection method of the silver nanowire block prepared by the invention comprises the following steps:
the pair of silver nanowire blocks 10 prepared in example 1 was used-6SERS detection was performed with mol/L Crystal Violet (CV). During testing, 20 μ L of CV solution was dropped on a silver nanowire block prepared in the present invention with 5 × 5 mm, and the silver nanowire block was put into a raman instrument for detection, and the results are shown in fig. 3; wherein: a is a pure CV powder SERS spectrogram; b is an SERS spectrogram of the silver nanowire block prepared by the method; c is a silver nanowire block as a substrate detection 10-6SERS spectrogram of mol/L CV solution; as can be seen from FIG. 3, the silver nanowire block prepared by the method has good SERS performance.
The method for regenerating the used silver nanowire block comprises the following steps: and (3) putting the used silver nanowire block into a culture dish filled with deionized water, placing the culture dish under a visible light source 300W xenon lamp, and irradiating for 30 min, wherein the distance between the culture dish and the xenon lamp is 15 cm. And then taking out the silver nanowire block, washing the silver nanowire block for 3 times by using deionized water, and then putting the silver nanowire block into a 60 ℃ drying oven to dry for 30 min, so that SERS detection can be carried out again. FIG. 4 shows an embodiment of the useSilver nanowire bulk pair 10 prepared in example 1-6And (4) carrying out SERS detection on the mol/L Crystal Violet (CV). After the silver nanowire block is recycled for 5 times, although the strength of the characteristic peak of the CV is reduced during each regeneration use, the complete spectrogram of the CV can be detected, and the reduction amplitude of the peak strength is within 20 percent, which shows that the silver nanowire block prepared by the method has good renewable recycling performance after being irradiated by visible light.
Claims (4)
1. A preparation method of a silver nanowire block for SERS detection is characterized by comprising the following steps:
s1: adding silver nitrate into polyhydric alcohol, and uniformly stirring to prepare a silver nitrate alcohol solution with the concentration of 0.01-0.3 g/mL, and marking as a solution A;
s2: adding polyvinylpyrrolidone serving as a surfactant into polyhydric alcohol, and uniformly stirring to prepare an alcoholic solution of polyvinylpyrrolidone with the concentration of 0.02-0.2 g/mL, and marking as a solution B;
s3: pouring the solution B into a container, heating to 50-80 ℃, keeping the temperature for 20-60 min, then dropwise adding the solution A into the solution B while stirring, and continuously stirring for 20-60 min after dropwise adding is finished, and marking as a solution C;
s4: adding chloride with the concentration of 0.0002-0.005 g/mL into the solution C, stirring for 5-10 min, heating at 90-140 ℃ for 8-24 h, and then obtaining an aggregated nano silver wire block on the upper layer of the solution C;
s5: and taking out the nano silver wire block, cleaning the nano silver wire block for 5-10 times by using deionized water or absolute ethyl alcohol or acetone, and drying the nano silver wire block for 60-120 min at 40-80 ℃ to obtain the SERS detection silver nano wire block.
2. The method for preparing the SERS detection silver nanowire block according to claim 1, characterized in that: the polyhydric alcohol in the steps S1 and S2 is any one of ethylene glycol, glycerol or isopropanol.
3. The method for preparing the SERS detection silver nanowire block according to claim 1, characterized in that: the molecular weight of the polyvinylpyrrolidone in the step S2 is 80000-1300000.
4. The method for preparing the SERS detection silver nanowire block according to claim 1, characterized in that: in the step S4, the chloride is any one of copper chloride, ferric chloride, sodium chloride, ferrous chloride, magnesium chloride and potassium chloride.
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