CN107759941B - Preparation method of quasi-waveguide structure dye/polymer film doped with silver cube-silicon dioxide core-shell material - Google Patents
Preparation method of quasi-waveguide structure dye/polymer film doped with silver cube-silicon dioxide core-shell material Download PDFInfo
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Abstract
The invention discloses a preparation method of a quasi-waveguide structure dye/polymer film doped with a silver cube-silicon dioxide core-shell material, which is characterized by comprising the following steps: (1) placing the cleaned quartz plate in 1 wt% of poly (diallyldimethylammonium chloride) aqueous solution for amino modification; putting the quartz plate into an ethanol solution of a silver cube-silicon dioxide core-shell material for adsorption, and then taking out the quartz plate, standing for 12 hours and naturally drying; (2) dissolving a polymer and a dye in chloroform to form a mixed solution; (3) and (3) spin-coating the mixed solution on the surface of the quartz plate adsorbed with the silver cube-silicon dioxide core-shell nano particles, and naturally drying at room temperature for 12 hours to obtain the quasi-waveguide structure dye/polymer film doped with the silver cube-silicon dioxide core-shell material.
Description
Technical Field
The invention relates to the field of photoelectric engineering and nanotechnology, in particular to a preparation method of a quasi-waveguide structure dye/polymer film doped with a silver cube-silicon dioxide core-shell material.
Background
Noble metal nanoparticles have attracted increasing attention due to their tunable structure, simple preparation method, and good solubility in most optoelectronic and biological materials. The noble metal nanoparticles are integrated into various functional materials, and have been widely applied to the fields of laser, display, catalysis, biochemical inspection, environmental monitoring and the like by utilizing the unique physical and chemical properties of the noble metal nanoparticles. In all these applications, the most specific local surface plasmon resonance characteristic of noble metals is mainly utilized, i.e. free electrons on the surface of noble metals can generate collective oscillation under the irradiation of external light, so that the electromagnetic field is effectively limited near the surface of noble metals, and the radiative and non-radiative relaxation rates of fluorescent centers around noble metals are obviously changed. In particular, noble metal nanoparticles scatter light more efficiently than dielectric materials of the same size, indicating that they can capture more photons. Therefore, the fluorescence enhancement phenomenon caused by the noble metal nanoparticles is largely observed. However, in some optical phenomena such as amplified spontaneous emission, together with the enhancement phenomenon that has been observed, a luminescence quenching phenomenon by noble metal nanoparticles has also been found, which is caused by the massive absorption of fluorescence emitted from fluorescent molecules in the immediate vicinity of, or even adsorbed to, the noble metal nanoparticles. Therefore, it is necessary to coat the noble metal nanoparticles to form a core-shell structure, so as to effectively control the interaction between the metal and the fluorescent center.
Disclosure of Invention
The invention aims to provide a preparation method of a quasi-waveguide structure dye/polymer film doped with a silver cube-silicon dioxide core-shell material, which is used for obtaining enhanced amplified spontaneous emission and further reducing the threshold of the amplified spontaneous emission.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of a quasi-waveguide structure dye/polymer film doped with a silver cube-silica core-shell material comprises the following steps:
(1) placing the quartz plate cleaned by ultrasonic waves into 1 wt% of poly (diallyldimethylammonium chloride) aqueous solution for 1 hour to modify the surface of the quartz plate with amino; placing the quartz plate modified with the amino in an ethanol solution containing the silver cube-silicon dioxide core-shell material for 2 hours to enable the surface of the quartz plate to be adsorbed by the silver cube-silicon dioxide core-shell particles, and then taking out the quartz plate adsorbed with the silver cube-silicon dioxide core-shell nano particles, standing for 12 hours and naturally drying;
(2) dissolving a polymer and a dye in chloroform to form a mixed solution, wherein the concentration of the polymer in the mixed solution is 0.3 g/ml, and the concentration of the dye in the mixed solution is 10 mmol/L;
(3) and (3) spin-coating the mixed solution obtained in the step (2) on the surface of the quartz plate adsorbed with the silver cube-silicon dioxide core-shell nano particles obtained in the step (1), and naturally drying at room temperature for 12 hours until dye molecules are diffused to the periphery of the silver cube-silicon dioxide core-shell nano particles, so as to obtain the quasi-waveguide structure dye/polymer film doped with the silver cube-silicon dioxide core-shell material.
The concentration of the silver cube-silicon dioxide core-shell material in the ethanol solution containing the silver cube-silicon dioxide core-shell material is 1-10 mmol/ml.
The preparation method of the silver cube-silicon dioxide core-shell material comprises the following steps: adding 5-15 ml of ethylene glycol into a round-bottom flask, preheating at 150 ℃ for 1 hour, then adding 0.06-0.18 ml of ethylene glycol solution containing 3 mmol/L sodium hydrosulfide while slowly stirring, then adding 0.5-1.5 ml of ethylene glycol solution containing 3 mmol/L hydrochloric acid, then adding 1.25-3.75 ml of ethylene glycol solution containing 20 mg/ml polyvinylpyrrolidone, then adding 0.4-1.2 ml of ethylene glycol solution containing 282 mmol/L silver trifluoroacetate, reacting for 30 minutes, and then rapidly cooling the reaction product in an ice-water bath manner; and then sequentially cleaning the reaction product by acetone and deionized water in a centrifugal mode for 3 times to remove the residual organic reagent on the surface of the reactant, then completely dispersing the reaction product in a mixed solution consisting of 5-25 ml of water, 3-15 ml of ethanol, 75-100 mg of hexadecyl trimethyl ammonium bromide and 100 microliters of ammonia water 500. mu.l, fully stirring, slowly dripping 5-50 microliters of ethyl orthosilicate into the mixed solution, slowly stirring to react for 1-24 hours, and sequentially washing by ethanol and acetone in a centrifugal mode to obtain the silver cube-silicon dioxide core-shell material.
The centrifugation speed in the centrifugation mode is 5000-.
The dye is fluorescein, coumarin or rhodamine; the polymer is sodium carboxymethyl cellulose, polyvinyl alcohol or polymethyl methacrylate.
Compared with the prior art, the invention has the advantages that: the invention discloses a preparation method of a quasi-waveguide structure dye/polymer film doped with a silver cube-silica core-shell material, which can reduce an amplified spontaneous emission threshold value, wherein the core-shell material is prepared by adopting the existing alcohol reduction method and the classical St ӧ ber method, the preparation of the quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material only needs one adsorption and one spin coating process, and the simple preparation process is suitable for various organic or inorganic film type photoelectric devices. The thickness of a silicon dioxide shell layer can be accurately controlled to be continuously adjustable within a range of 10 nanometers by controlling the feed ratio of ethyl orthosilicate and the silver cube, so that the distance between laser dye molecules and the surface of the silver cube is effectively regulated and controlled, the dye molecules are positioned in a local enhanced electromagnetic field formed by plasma resonance on the surface of the silver cube, and the effects of obviously enhancing the spontaneous radiation fluorescence intensity of the method and reducing the threshold value are achieved. Meanwhile, the phenomenon of quenching of dye molecule luminescence caused by direct contact with the surface of the silver cube is weakened.
In summary, according to the preparation method of the quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material, the silver cube-silica core-shell material is doped into the dye/polymer film by using simple adsorption and spin coating processes to form the quasi-waveguide structure. By adjusting the thickness of the silicon dioxide shell layer, the amplified spontaneous radiation of the local electromagnetic field enhanced film formed by the surface plasma resonance of the silver cube is fully utilized, so that the threshold value of the film is reduced. After the quasi-waveguide structure dye/polymer film is doped with the silver cube-silicon dioxide core-shell material, the reduction ratio of the amplified spontaneous emission threshold can reach 75 percent at most. Under the same excitation intensity, the maximum enhancement multiple of the fluorescence intensity of the doped quasi-waveguide structure dye/polymer film can reach about 10 times, and the maximum reduction ratio of the full width at half maximum of the fluorescence peak can reach 40%.
Drawings
FIG. 1 is a transmission electron micrograph of a silver cube prepared in example 1 of the present invention;
FIG. 2 is a TEM photograph of a silver cube-silica core-shell material prepared in example 1 of the present invention;
FIG. 3 is a schematic diagram of a process for preparing a quasi-waveguide structure dye/polymer film doped with a silver cubic-silica core-shell material in example 1 of the present invention;
FIG. 4 is an enlarged spontaneous emission test optical path diagram of a quasi-waveguide structured dye/polymer film doped with a silver cube-silica core-shell material prepared in example 1 of the present invention;
FIG. 5 is an enlarged spontaneous emission spectrum of a quasi-waveguiding dye/polymer film using undoped and doped silver cube-silica core-shell materials prepared in example 1 of the present invention;
FIG. 6 is a TEM image of a silver cube-silica core-shell material prepared in example 2 of the present invention;
FIG. 7 is an enlarged spontaneous emission spectrum of a quasi-waveguiding dye/polymer film using undoped and doped silver cube-silica core-shell materials prepared in example 2 of the present invention;
FIG. 8 is a TEM image of a silver cube-silica core-shell material prepared in example 2 of the present invention;
fig. 9 is an enlarged spontaneous emission spectrum of a quasi-waveguiding dye/polymer film using undoped and doped silver cube-silica core-shell materials prepared in example 2 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are commercially available products.
Example 1
A preparation method of a quasi-waveguide structure dye/polymer film doped with a silver cube-silica core-shell material comprises the following steps:
(1) placing the quartz plate cleaned by ultrasonic waves into 1 wt% of poly (diallyldimethylammonium chloride) aqueous solution for 1 hour to modify the surface of the quartz plate with amino; putting the quartz plate modified with the amino into an ethanol solution containing the silver cube-silicon dioxide core-shell material (the concentration of the silver cube-silicon dioxide core-shell material is 5 mmol/ml) for 2 hours, so that the surface of the quartz plate is adsorbed with the silver cube-silicon dioxide core-shell particles, and then taking out the quartz plate adsorbed with the silver cube-silicon dioxide core-shell nanoparticles, standing for 12 hours, and naturally drying;
the preparation method of the silver cube-silicon dioxide core-shell material comprises the following steps: adding 10 ml of ethylene glycol into a round-bottom flask, preheating the mixture at 150 ℃ for 1 hour, then adding 0.12 ml of ethylene glycol solution containing sodium hydrosulfide (wherein the concentration of the sodium hydrosulfide is 3 mmol/L) while slowly stirring, adding 1 ml of ethylene glycol solution containing hydrochloric acid (wherein the concentration of the hydrochloric acid is 3 mmol/L) after 2 minutes, then adding 2.5 ml of ethylene glycol solution containing polyvinylpyrrolidone (wherein the concentration of the polyvinylpyrrolidone is 20 mg/ml), adding 0.8 ml of ethylene glycol solution containing silver trifluoroacetate (wherein the concentration of the silver trifluoroacetate is 282 mmol/L) after 2 minutes, and after 30 minutes of reaction, rapidly cooling the reaction product by means of an ice-water bath; then sequentially cleaning the reaction product by acetone and deionized water in a centrifugal mode for 3 times to remove residual organic reagents on the surface of the reactant, then completely dispersing the reaction product in a mixed solution consisting of 15 ml of water, 9 ml of ethanol, 88 mg of hexadecyl trimethyl ammonium bromide and 300 ml of ammonia water, fully stirring, slowly dripping 28 microliters of ethyl orthosilicate into the mixed solution, slowly stirring to react for 12 hours, and sequentially washing by ethanol and acetone in a centrifugal mode to obtain the silver cube-silicon dioxide core-shell material; wherein in the centrifugation mode, the centrifugation speed is 10000 r/min, and the centrifugation time is 18 min;
(2) dissolving a polymer and a dye in chloroform to form a mixed solution, wherein the polymer in the mixed solution is polymethyl methacrylate, and the concentration of the polymethyl methacrylate is 0.3 g/ml; the dye is rhodamine 6G, and the concentration of the dye is 10 millimole/liter;
(3) and (3) spin-coating the mixed solution obtained in the step (2) on the surface of the quartz plate adsorbed with the silver cube-silicon dioxide core-shell nano particles obtained in the step (1), and naturally drying at room temperature for 12 hours until dye molecules are diffused to the periphery of the silver cube-silicon dioxide core-shell nano particles, so as to obtain the quasi-waveguide structure dye/polymer film doped with the silver cube-silicon dioxide core-shell material.
The quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material prepared in the embodiment 1 is excited and tested by amplified spontaneous radiation, and the specific steps are as follows: nd with Q-switch: the surface of the quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material is irradiated by frequency-doubled laser (532 nm in wavelength, 7 ns in pulse width and 10 hz in frequency) of a YAG pulse laser (Dawa-100). The input laser intensity is controlled by adjusting the plane-convex cylindrical mirror group and the adjustable slit. The light exiting the side of the film is coupled into a spectrometer for testing by using a focusing lens.
Fig. 1 shows a transmission electron microscope photograph of the silver cube prepared in this example. As can be seen from fig. 1, the prepared silver cubes have sides of 40 to 55 nm.
Fig. 2 shows a transmission electron micrograph of the silver cube-silica core shell material prepared in this example. As can be seen from FIG. 2, the prepared material has a core-shell structure, the center is silver cubic nanoparticles, the outer layer is a silicon dioxide shell layer, and the thickness of the shell layer is 3 nanometers.
Fig. 3 shows a schematic diagram of the preparation process of the quasi-waveguide structure dye/polymer film doped with silver cube-silica core-shell material in this embodiment. As can be seen from FIG. 3, the preparation process is that the surface of the quartz plate is firstly modified to adsorb the silver cube-silicon dioxide core-shell material, and then the rhodamine 6G/polymethyl methacrylate solution is spin-coated to form the film.
Fig. 4 shows an amplified spontaneous emission test light path diagram of the quasi-waveguide structure rhodamine 6G/polymethyl methacrylate film doped with the silver cube-silica core-shell material prepared in the embodiment, and as can be seen from fig. 4, frequency doubling laser of a laser irradiates the surface of the quasi-waveguide structure rhodamine 6G/polymethyl methacrylate film doped with the silver cube-silica core-shell material, input laser intensity is controlled by adjusting a flat convex cylindrical mirror group and an adjustable slit to excite the film to emit amplified spontaneous emission fluorescence, and fluorescence emitted from the side surface of the film is coupled into a spectrometer by adopting a focusing lens to be tested.
Fig. 5 shows the amplified spontaneous emission spectra of the quasi-waveguide structured dye/polymer film of undoped and doped silver cube-silica core-shell materials prepared in this example, and it can be seen from fig. 5 that the fluorescence intensity after doping is increased by 3 (1.7) times, the full width at half maximum of the fluorescence peak is reduced from 8 nm to 6.8 nm, and the reduction is up to 15%. In particular, the threshold of amplified spontaneous emission is reduced from 0.8 mJ/cm to 0.2 mJ/cm by 75%.
Example 2
The difference from the above example 1 is that:
the concentration of the silver cube-silica core-shell material in the ethanol solution containing the silver cube-silica core-shell material in the step (1) is 1 mmol/ml, and the preparation method of the silver cube-silica core-shell material comprises the following steps: adding 5-15 ml of ethylene glycol into a round-bottom flask, preheating at 150 ℃ for 1 hour, then adding 0.06 ml of ethylene glycol solution containing sodium hydrosulfide (wherein the concentration of the sodium hydrosulfide is 3 mmol/L) while slowly stirring, adding 0.5 ml of ethylene glycol solution containing hydrochloric acid (wherein the concentration of the hydrochloric acid is 3 mmol/L) after 2 minutes, then adding 1.25 ml of ethylene glycol solution containing polyvinylpyrrolidone (wherein the concentration of the polyvinylpyrrolidone is 20 mg/L), adding 0.4 ml of ethylene glycol solution containing silver trifluoroacetate (wherein the concentration of the silver trifluoroacetate is 282 mmol/L) after 2 minutes, and after 30 minutes of reaction, rapidly cooling the reaction product by means of an ice-water bath; then sequentially cleaning the reaction product by acetone and deionized water in a centrifugal mode for 3 times to remove residual organic reagents on the surface of the reactant, then completely dispersing the reaction product in a mixed solution consisting of 5 milliliters of water, 3 milliliters of ethanol, 75 milligrams of hexadecyl trimethyl ammonium bromide and 100 microliters of ammonia water, fully stirring, slowly dripping 5 microliters of ethyl orthosilicate into the mixed solution, slowly stirring to react for 1 hour, and sequentially washing by ethanol and acetone in a centrifugal mode to obtain the silver cube-silicon dioxide core-shell material; wherein in the centrifugation mode, the centrifugation speed is 5000 r/min, and the centrifugation time is 30 min;
in the step (2), the polymer in the mixed solution is sodium carboxymethyl cellulose, and the concentration of the polymer is 0.3 g/ml; the dye was fluorescein at a concentration of 10 mmol/l.
The quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material prepared in the embodiment 2 is excited and tested by amplified spontaneous radiation, and the specific steps are as follows: nd with Q-switch: the surface of the quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material is irradiated by frequency-doubled laser (532 nm in wavelength, 7 ns in pulse width and 10 hz in frequency) of a YAG pulse laser (Dawa-100). The input laser intensity is controlled by adjusting the plane-convex cylindrical mirror group and the adjustable slit. The light exiting the side of the film is coupled into a spectrometer for testing by using a focusing lens.
Fig. 6 shows a transmission electron micrograph of the silver cube-silica core-shell material prepared in this example. As can be seen from FIG. 6, the prepared material has a core-shell structure, the center is silver cubic nanoparticles, the outer layer is a silica shell layer, and the thickness of the shell layer is 5 nanometers.
Fig. 7 shows the amplified spontaneous emission spectra of the quasi-waveguide structured dye/polymer film of undoped and doped silver cube-silica core-shell materials prepared in this example, and it can be seen from fig. 7 that the fluorescence intensity after doping is increased by 1.7 times, the full width at half maximum of the fluorescence peak is reduced from 8 nm to 7.7 nm, and the reduction amplitude reaches 3.75%. In particular, the threshold of amplified spontaneous emission is reduced from 0.8 mJ/cm to 0.5 mJ/cm, and the reduction amplitude reaches 37.5%.
Example 3
The difference from the above example 1 is that:
the concentration of the silver cube-silica core-shell material in the ethanol solution containing the silver cube-silica core-shell material in the step (1) is 10 mmol/ml, and the preparation method of the silver cube-silica core-shell material comprises the following steps: adding 15 ml of ethylene glycol into a round-bottom flask, preheating the mixture at 150 ℃ for 1 hour, then adding 0.18 ml of ethylene glycol solution containing sodium hydrosulfide (wherein the concentration of the sodium hydrosulfide is 3 mmol/L) while slowly stirring, adding 1.5 ml of ethylene glycol solution containing hydrochloric acid (wherein the concentration of the hydrochloric acid is 3 mmol/L) after 2 minutes, then adding 3.75 ml of ethylene glycol solution containing polyvinylpyrrolidone (wherein the concentration of the polyvinylpyrrolidone is 20 mg/L), adding 1.2 ml of ethylene glycol solution containing silver trifluoroacetate (wherein the concentration of the silver trifluoroacetate is 282 mmol/L) after 2 minutes, and after 30 minutes of reaction, rapidly cooling the reaction product by means of an ice-water bath; then sequentially cleaning the reaction product by acetone and deionized water in a centrifugal mode for 3 times to remove residual organic reagents on the surface of the reactant, then completely dispersing the reaction product in a mixed solution consisting of 25 milliliters of water, 15 milliliters of ethanol, 100 milligrams of hexadecyl trimethyl ammonium bromide and 500 milliliters of ammonia water, fully stirring, slowly dripping 50 milliliters of ethyl orthosilicate into the mixed solution, slowly stirring to react for 24 hours, and sequentially washing by ethanol and acetone in a centrifugal mode to obtain the silver cube-silicon dioxide core-shell material; wherein the centrifugation speed is 15000 r/min and the centrifugation time is 5 min in the centrifugation mode;
in the step (2), the polymer in the mixed solution is polyvinyl alcohol, and the concentration of the polymer is 0.3 g/ml; the dye was coumarin at a concentration of 10 mmol/l.
The quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material prepared in the embodiment 3 is excited and tested by amplified spontaneous radiation, and the specific steps are as follows: nd with Q-switch: the surface of the quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material is irradiated by frequency-doubled laser (532 nm in wavelength, 7 ns in pulse width and 10 hz in frequency) of a YAG pulse laser (Dawa-100). The input laser intensity is controlled by adjusting the plane-convex cylindrical mirror group and the adjustable slit. The light exiting the side of the film is coupled into a spectrometer for testing by using a focusing lens.
Fig. 8 shows a transmission electron micrograph of the silver cube-silica core shell material prepared in this example. As can be seen from FIG. 8, the prepared material has a core-shell structure, the center is silver cubic nanoparticles, the outer layer is a silica shell layer, and the thickness of the shell layer is 3 nanometers.
Fig. 9 shows the amplified spontaneous emission spectrum of the quasi-waveguide structured dye/polymer film of undoped and doped silver cube-silica core-shell materials prepared in this example, and it can be seen from fig. 9 that the fluorescence intensity after doping is increased by 6.9 times, the full width at half maximum of the fluorescence peak is reduced from 12.8 nm to 7.2 nm, and the reduction rate reaches 43.75%. In particular, the threshold of amplified spontaneous emission is reduced from 1.0 mJ/cm to 0.3 mJ/cm by 70%.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (4)
1. A preparation method of a quasi-waveguide structure dye/polymer film doped with a silver cube-silica core-shell material is characterized by comprising the following steps:
(1) placing the quartz plate cleaned by ultrasonic waves into 1 wt% of poly (diallyldimethylammonium chloride) aqueous solution for 1 hour to modify the surface of the quartz plate with amino; putting the quartz plate modified with the amino into an ethanol solution containing the silver cube-silicon dioxide core-shell material for 2 hours, so that the surface of the quartz plate is adsorbed by the silver cube-silicon dioxide core-shell particles, taking out the quartz plate adsorbed with the silver cube-silicon dioxide core-shell nano particles, standing for 12 hours, and naturally drying the quartz plate, wherein the preparation method of the silver cube-silicon dioxide core-shell material comprises the following steps: adding 5-15 ml of ethylene glycol into a round-bottom flask, preheating at 150 ℃ for 1 hour, then adding 0.06-0.18 ml of ethylene glycol solution containing 3 mmol/L sodium hydrosulfide while slowly stirring, then adding 0.5-1.5 ml of ethylene glycol solution containing 3 mmol/L hydrochloric acid, then adding 1.25-3.75 ml of ethylene glycol solution containing 20 mg/ml polyvinylpyrrolidone, then adding 0.4-1.2 ml of ethylene glycol solution containing 282 mmol/L silver trifluoroacetate, reacting for 30 minutes, and then rapidly cooling the reaction product in an ice-water bath manner; then cleaning the reaction product by using acetone and deionized water in sequence for 3 times in a centrifugal mode to remove the residual organic reagent on the surface of the reactant, then completely dispersing the reaction product in a mixed solution consisting of 5-25 ml of water, 3-15 ml of ethanol, 75-100 mg of hexadecyl trimethyl ammonium bromide and 100 microliters of ammonia water 500 microliters, after fully stirring, slowly dripping 5-50 microliters of ethyl orthosilicate into the mixed solution, slowly stirring to react for 1-24 hours, and then washing by using ethanol and acetone in sequence in a centrifugal mode to obtain the silver cube-silicon dioxide core-shell material;
(2) dissolving a polymer and a dye in chloroform to form a mixed solution, wherein the concentration of the polymer in the mixed solution is 0.3 g/ml, and the concentration of the dye in the mixed solution is 10 mmol/L;
(3) and (3) spin-coating the mixed solution obtained in the step (2) on the surface of the quartz plate adsorbed with the silver cube-silicon dioxide core-shell nano particles obtained in the step (1), and naturally drying at room temperature for 12 hours until dye molecules are diffused to the periphery of the silver cube-silicon dioxide core-shell nano particles, so as to obtain the quasi-waveguide structure dye/polymer film doped with the silver cube-silicon dioxide core-shell material.
2. The preparation method of the quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material according to claim 1, wherein the preparation method comprises the following steps: the concentration of the silver cube-silicon dioxide core-shell material in the ethanol solution containing the silver cube-silicon dioxide core-shell material is 1-10 mmol/ml.
3. The preparation method of the quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material according to claim 1, wherein the preparation method comprises the following steps: the centrifugation speed in the centrifugation mode is 5000-.
4. The preparation method of the quasi-waveguide structure dye/polymer film doped with the silver cube-silica core-shell material according to claim 1, wherein the preparation method comprises the following steps: the dye is fluorescein, coumarin or rhodamine; the polymer is sodium carboxymethyl cellulose, polyvinyl alcohol or polymethyl methacrylate.
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