CN118976906A - Flower-shaped spherical silver powder and preparation method thereof - Google Patents
Flower-shaped spherical silver powder and preparation method thereof Download PDFInfo
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- CN118976906A CN118976906A CN202411134220.3A CN202411134220A CN118976906A CN 118976906 A CN118976906 A CN 118976906A CN 202411134220 A CN202411134220 A CN 202411134220A CN 118976906 A CN118976906 A CN 118976906A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
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Abstract
The application relates to flower-shaped spherical silver powder and a preparation method thereof, wherein the preparation method comprises the following steps: preparing a first solution and a second solution, wherein the first solution comprises silver nitrate, and the second solution comprises a reducing agent, a dispersing agent and a surfactant; the pH value of the second solution is regulated to a preset value, and then the second solution is added into the first solution for reaction to obtain silver powder suspension, wherein the preset value is 3-7; and separating flower-like spherical silver powder from the silver powder suspension, wherein the flower-like spherical silver powder is similar to the spherical silver powder with a flower-like structure. According to the application, the growth mode of the silver powder can be effectively regulated and controlled by introducing the surfactant, so that the silver powder has a rough surface, the flower-shaped spherical silver powder with large specific surface area can be prepared, the preparation process is simple, and the silver powder has good application prospects in multiple fields of conductive slurry, conductive paint and the like.
Description
Technical Field
The application relates to the technical field of metal powder preparation, in particular to flower-shaped spherical silver powder and a preparation method thereof.
Background
In the technical field of metal powder preparation, silver powder occupies a core position in a plurality of high-tech applications such as electronic packaging, conductive coating, antibacterial materials and the like due to excellent conductivity and chemical stability. Both the nature and the application of silver powder depend on the size and morphology of the silver particles.
However, the specific surface area of the nano-metal particles is limited because of the agglomeration and bridging phenomena. Therefore, how to prepare silver particles with higher specific surface area is a problem to be solved at present and in the future.
Disclosure of Invention
The application aims to provide flower-shaped spherical silver powder and a preparation method thereof, so as to prepare flower-shaped spherical silver powder with large specific surface area, thereby having good application prospects in various fields of conductive slurry, conductive paint and the like.
The embodiment of the application provides a preparation method of flower-shaped spherical silver powder, which comprises the following steps: preparing a first solution and a second solution, wherein the first solution comprises silver nitrate, and the second solution comprises a reducing agent, a dispersing agent and a surfactant; the pH value of the second solution is regulated to a preset value, and then the second solution is added into the first solution for reaction to obtain silver powder suspension, wherein the preset value is 3-7; and separating flower-like spherical silver powder from the silver powder suspension, wherein the flower-like spherical silver powder is similar to the spherical silver powder with a flower-like structure.
Wherein, the mass concentration of silver nitrate in the first solution is 5-25%, and the mass concentration of the reducing agent in the second solution is 10-20%; the ratio of the mass of the reducing agent in the second solution to the mass of the silver nitrate in the first solution is 50-60%; the ratio of the mass of the dispersing agent in the second solution to the mass of the silver nitrate in the first solution is 5-20%; the ratio of the mass of the surfactant in the second solution to the mass of the silver nitrate in the first solution is 0.5-5%.
Wherein the reducing agent comprises at least one of glucose, ascorbic acid, hydrazine hydrate, hydrogen peroxide, formaldehyde and acetaldehyde; the dispersing agent comprises at least one of polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, acacia, gelatin and tween; the surfactant comprises at least one of silane coupling agent, span, oleic acid, sodium dodecyl benzene sulfonate, methyl benzotriazole and benzotriazole.
Wherein the surfactant is sodium dodecyl benzene sulfonate or benzotriazole.
Wherein, after the pH value of the second solution is regulated to a preset value, the second solution is added into the first solution for reaction to obtain silver powder suspension, comprising: adding a pH regulator into the second solution to regulate the pH value of the second solution to a preset value, and then adding the second solution into the first solution to react to obtain silver powder suspension; the pH regulator comprises at least one of ammonia water, sodium hydroxide, sodium bicarbonate, oxalic acid, phosphoric acid, nitric acid, hydrochloric acid and sulfuric acid.
Wherein, after the pH value of the second solution is regulated to a preset value, the second solution is added into the first solution for reaction to obtain silver powder suspension, comprising: and (3) after the pH value of the second solution is regulated to a preset value, adding the second solution into the first solution for reaction in a preset adding time under the stirring condition to obtain silver powder suspension, wherein the preset adding time is 5-15 min.
Wherein, after the pH value of the second solution is regulated to a preset value, the second solution is added into the first solution for reaction to obtain silver powder suspension, comprising: and (3) after the pH value of the second solution is regulated to a preset value, adding the second solution into the first solution for reaction at a preset reaction temperature, so as to obtain silver powder suspension, wherein the preset reaction temperature is 25-45 ℃.
Wherein the flower-like spherical silver powder is separated from the silver powder suspension, comprising: and (3) carrying out solid-liquid separation on the silver powder suspension, cleaning the separated solid, and drying the cleaned solid at the drying temperature of 40-60 ℃ for 60-120 min to obtain the flower-shaped spherical silver powder.
Wherein the specific surface area of the flower-shaped spherical silver powder is more than or equal to 0.9m 2/g.
The embodiment of the application also provides flower-shaped spherical silver powder, which is prepared by adopting the preparation method of any flower-shaped spherical silver powder.
According to the flower-like spherical silver powder and the preparation method thereof, the first solution and the second solution are prepared, the first solution comprises silver nitrate, the second solution comprises the reducing agent, the dispersing agent and the surfactant, the pH value of the second solution is regulated to a preset value, the second solution is added into the first solution for reaction to obtain the silver powder suspension, the preset value is 3-7, the flower-like spherical silver powder is separated from the silver powder suspension, and is of a flower-like structure, so that the flower-like spherical silver powder with large specific surface area can be prepared by introducing the surfactant, the preparation process is simple, the shape and the size of the flower-like spherical silver powder can be effectively regulated by changing the dosage and/or the type of the surfactant, the flower-like spherical silver powder can be effectively prevented from agglomerating and bridging effects, good dispersibility and uniformity of the flower-like spherical silver powder are ensured, and the flower-like spherical silver powder has good application prospects in multiple fields such as conductive slurry, conductive coating and the like.
Drawings
The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a schematic flow chart of a method for preparing flower-like spherical silver powder according to an embodiment of the present application;
FIG. 2 is a scanning electron microscope image of the flower-shaped spherical silver powder prepared by the method for preparing flower-shaped spherical silver powder according to example 1 of the present application;
FIG. 3 is a scanning electron microscope image of the flower-shaped spherical silver powder prepared by the method for preparing flower-shaped spherical silver powder according to example 2 of the present application;
FIG. 4 is a scanning electron microscope image of the flower-shaped spherical silver powder prepared by the method for preparing flower-shaped spherical silver powder according to example 3 of the present application.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present application, but do not limit the scope of the present application. Likewise, the following examples are only some, but not all, of the examples of the present application, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present application.
In the following description of the present application reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or a different subset of all possible embodiments and can be combined with each other without conflict.
In the following description of the present application, the terms "first", "second", "third" and "third" are merely used to distinguish similar objects from each other, and do not represent a particular ordering of the objects, it being understood that the "first", "second", "third" may be interchanged with a particular order or sequence, as permitted, to enable embodiments of the present application described herein to be practiced otherwise than as illustrated or described herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the application only and is not intended to be limiting of the application.
The following detailed description is made in connection with specific embodiments, and it should be noted that the serial numbers of the following embodiments are not meant to limit the preferred order of the embodiments.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for preparing flower-shaped spherical silver powder according to an embodiment of the present application, where a specific flow chart of the method for preparing flower-shaped spherical silver powder may be as follows:
S11, preparing a first solution and a second solution, wherein the first solution comprises silver nitrate, and the second solution comprises a reducing agent, a dispersing agent and a surfactant.
In this embodiment, the mass concentration of silver nitrate in the first solution may be 5 to 25%, and in some examples, the mass concentration of silver nitrate in the first solution may be specifically 5 to 15%, for example, may be 5%,10%, 15%, or the like. The mass concentration of the reducing agent in the second solution may be 10 to 20%, for example, 10%, 15%, 20%, or the like. The ratio of the mass of the reducing agent in the second solution to the mass of the silver nitrate in the first solution may be 50 to 60%, for example, 50%, 52%, 54%, 56%, 58%, 60%, or the like. The ratio of the mass of the dispersant in the second solution to the mass of the silver nitrate in the first solution may be 5 to 20%, for example, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%,16%,17%,18%,19% or 20%, etc. The ratio of the mass of the surfactant in the second solution to the mass of the silver nitrate in the first solution may be 0.5 to 5%, for example, may be 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5% or 5.0%, etc.
Specifically, the reducing agent may include at least one of glucose, ascorbic acid, hydrazine hydrate, hydrogen peroxide, formaldehyde, and acetaldehyde, and for example, may be specifically ascorbic acid. The dispersing agent may include at least one of polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, acacia, gelatin, and tween, and for example, may be specifically polyvinylpyrrolidone. The surfactant may include at least one of a silane coupling agent, span, oleic acid, sodium dodecylbenzenesulfonate, methyl benzotriazol and benzotriazol, and for example, may be specifically sodium dodecylbenzenesulfonate or benzotriazol.
In some embodiments, the method of preparing the first solution may be specifically: silver nitrate is added into ultrapure water, and the first solution is obtained by stirring and dissolving. In addition, in the specific implementation, 5kg of silver nitrate solid may be added to ultrapure water, and stirred and dissolved to obtain a silver nitrate solution (i.e., first solution) having a mass fraction of 5%.
In some embodiments, the method for configuring the second solution may be specifically: adding a reducing agent, a dispersing agent and a proper amount of surfactant into ultrapure water, and stirring and dissolving to obtain a second solution. In the specific implementation, 2.6kg of ascorbic acid solid is taken as a reducing agent, added into ultrapure water, stirred and dissolved to obtain a reducing agent solution with the mass fraction of 15%, 300g of polyvinylpyrrolidone is taken as a dispersing agent, 30g of sodium dodecyl benzene sulfonate is taken as a surfactant, and uniformly stirred to obtain a second solution.
In some embodiments, the method for preparing flower-shaped spherical silver powder may further include: the temperature of the first solution and the second solution is controlled to 25 to 45℃and, for example, 25℃30℃35℃40℃45℃or the like can be used. In this way, the reaction temperature of the first solution and the second solution in the subsequent step S12 can be controlled, and the morphology of the silver powder desired to be produced can be controlled. And, the inventors of the present application found that the higher the reaction temperature of the first solution and the second solution in the subsequent step S12, the more loosely the aggregation of the corresponding produced microcrystalline silver powder.
S12, adjusting the pH value of the second solution to a preset value, and then adding the second solution into the first solution to react to obtain silver powder suspension, wherein the preset value is 3-7.
The preset value may be specifically 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, or 7.
In some embodiments, the step S12 may include: and adding a pH regulator into the second solution to regulate the pH value of the second solution to a preset value, and then adding the second solution into the first solution to react to obtain silver powder suspension. The pH adjuster may include at least one of ammonia, sodium hydroxide, sodium bicarbonate, oxalic acid, phosphoric acid, nitric acid, hydrochloric acid, and sulfuric acid, and may be, for example, ammonia and/or nitric acid.
In some embodiments, the step S12 may include: and (3) after the pH value of the second solution is regulated to a preset value, adding the second solution into the first solution for reaction in a preset adding time under the stirring condition, and obtaining silver powder suspension. The preset addition time (i.e., the duration of adding the second solution to the first solution) may be 5 to 15 minutes, and in some examples, the preset addition time may be specifically 5 to 10 minutes, for example, may be 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, or 10 minutes, etc.
In some embodiments, the step S12 may include: and after the pH value of the second solution is regulated to a preset value, adding the second solution into the first solution for reaction at a preset reaction temperature to obtain silver powder suspension. The preset reaction temperature may be 25 to 45 ℃, for example, 25 ℃,30 ℃,35 ℃, 40 ℃, 45 ℃ or the like. Specifically, the inventors of the present application found that the higher the preset reaction temperature (i.e., the reaction temperature of the first solution and the second solution), the more loosely the aggregation of the corresponding produced microcrystalline silver powder. In addition, in the specific implementation, the reaction temperature of the first solution and the second solution in the step S12 may be controlled to be a preset reaction temperature by controlling the temperature of the first solution and the second solution prepared in the step S11 to be a preset reaction temperature.
In some embodiments, the temperature of the first solution and the second solution prepared in the step S11 is controlled to a preset reaction temperature (e.g., 25 ℃ or 45 ℃), and the step S12 may include: and adding a pH regulator (such as ammonia water) into the second solution to regulate the pH value of the second solution to 3-7 (such as about 5), then adding the second solution into the first solution for reaction under stirring for 5-10 min (such as 8 min), and continuing stirring for 5-15 min (such as 10 min) after the addition to obtain the silver powder suspension.
Step S13: and separating flower-like spherical silver powder from the silver powder suspension, wherein the flower-like spherical silver powder is similar to the spherical silver powder with a flower-like structure.
It should be noted that, because of the unique structural characteristics of the flower-shaped spherical silver powder obtained after the completion of the step S13, the flower-shaped spherical silver powder can provide a larger specific surface area and better conductivity, so that the flower-shaped spherical silver powder has great application potential in the fields of advanced electronic equipment, high-efficiency catalysts and the like.
In addition, compared with the method for improving the specific surface area of the silver powder by increasing the surface roughness of the silver powder in the related art, for example, by introducing a novel dispersing agent, a crystal form interfering agent or other reagents, the growth mode of the silver powder is regulated and controlled to enable the silver powder to have a rough surface, in the embodiment, the crystal surface growth is controlled and controlled by introducing the surfactant, the similar growth regulation and control effect can be achieved on the silver powder, so that the quasi-spherical silver powder (namely the flower-shaped spherical silver powder) with a special flower-shaped structure can be prepared, and the flower-shaped spherical silver powder has a larger specific surface area and a higher sintering activity due to the rough surface and more protruding structures, so that the method has a wide application prospect in the field of photovoltaic silver paste.
In this embodiment, the flower-shaped spherical silver powder obtained after the completion of the above step S13 has a flower-shaped structure, and its specific surface area may be greater than or equal to 0.9m 2/g, and it is understood that since the surface has a flower-shaped structure extending out, its specific surface area is large, and it is advantageous to improve its sintering activity.
In some embodiments, the step S13 may include: and (3) carrying out solid-liquid separation on the silver powder suspension, cleaning the separated solid, and drying the cleaned solid to obtain the flower-shaped spherical silver powder. The drying temperature may be 40 to 60 ℃, for example, 40 ℃, 45 ℃, 50 ℃,55 ℃, 60 ℃ or the like. The drying time may be 60 to 120 minutes, for example, 60 minutes, 70 minutes, 80 minutes, 90 minutes, 100 minutes, 110 minutes, 120 minutes, or the like may be specifically mentioned. The method for solid-liquid separation of silver powder suspension liquid can be specifically as follows: the solids and the liquids in the silver powder suspension are separated by filtration. The method for cleaning the separated solid can be specifically as follows: the separated solid was washed with ultrapure water.
In some specific embodiments, the step S13 may include: and (3) carrying out solid-liquid separation on silver powder suspension, cleaning the separated solid by using ultrapure water, transferring the cleaned solid into an oven for drying, wherein the drying temperature can be 40-60 ℃ (for example, 60 ℃), the drying time can be 60-120 min (for example, 120 min), and obtaining a target product (namely, the flower-shaped spherical silver powder) after the drying is finished.
It will be appreciated that all of the materials used in the examples of the present application are commercially available.
Also, for ease of understanding, the present application is described in further detail below by way of three specific examples (i.e., example 1, example 2, and example 3).
Example 1
In example 1, the specific flow of the preparation method of the flower-shaped spherical silver powder can be as follows:
S21, preparing a first solution and a second solution, wherein the preparation method comprises the following steps: weighing 5kg of silver nitrate solid to prepare a silver nitrate solution with the mass fraction of 5%, so as to obtain a first solution; weighing 2.6kg of ascorbic acid solid, preparing a reducing agent solution with the mass fraction of 15%, adding 300g of polyvinylpyrrolidone as a dispersing agent into the reducing agent solution, adding 30g of sodium dodecyl benzene sulfonate as a surfactant, and uniformly stirring to obtain a second solution; the temperature of the first solution and the second solution was controlled to about 25 ℃.
S22, adding ammonia water into the second solution to adjust the pH value of the second solution to about 5, adding the second solution into the first solution under the stirring condition, and reacting for 10min after the addition is finished within 8min to obtain silver powder suspension.
S23, carrying out solid-liquid separation on silver powder suspension, cleaning the separated solid by using ultrapure water, and placing the cleaned solid in a 60 ℃ oven for baking for 120min to obtain a target product (namely, the flower-shaped spherical silver powder A1).
Specifically, as is known from a scanning electron microscope image (as shown in FIG. 2) of the flower-like spherical silver powder A1, the flower-like spherical silver powder A1 is a sphere-like silver powder having a special flower-like structure, and its surface area is measured by a gas adsorption method, resulting in a specific surface area of 0.9m 2/g.
Example 2
The preparation method of the flower-like spherical silver powder provided in example 2 is substantially identical to the preparation method of the flower-like spherical silver powder provided in example 1, and the difference between them is that: example 2 the surfactant added to the reducing agent solution was 30g of benzotriazole instead of 30g sodium dodecylbenzenesulfonate. Accordingly, in example 2, the specific flow of the preparation method of the flower-shaped spherical silver powder can be as follows:
S31, preparing a first solution and a second solution, wherein the preparation method comprises the following steps: weighing 5kg of silver nitrate solid to prepare a silver nitrate solution with the mass fraction of 5%, so as to obtain a first solution; weighing 2.6kg of ascorbic acid solid, preparing a reducing agent solution with the mass fraction of 15%, adding 300g of polyvinylpyrrolidone as a dispersing agent into the reducing agent solution, adding 30g of benzotriazole as a surfactant, and uniformly stirring to obtain a second solution; the temperature of the first solution and the second solution was controlled to about 25 ℃.
And S32, adding ammonia water into the second solution to adjust the pH value of the second solution to about 5, adding the second solution into the first solution under the stirring condition, and reacting for 10min after the addition is finished within 8min to obtain the silver powder suspension.
S33, carrying out solid-liquid separation on silver powder suspension, cleaning the separated solid by using ultrapure water, and placing the cleaned solid in a 60 ℃ oven for baking for 120min to obtain a target product (namely, the flower-shaped spherical silver powder A2).
Specifically, as is known from the scanning electron microscope image (as shown in fig. 3) of the flower-like spherical silver powder A2, the flower-like spherical silver powder A2 is a sphere-like silver powder having a special flower-like structure. Further, as can be seen from comparing the sem image of the flower-like spherical silver powder A2 with the sem image of the flower-like spherical silver powder A1, that is, comparing fig. 3 and 2, the surfactant was changed in example 2, and the morphology and size of the obtained flower-like spherical silver powder A2 were significantly changed, for example, the plate-like structure of the protrusions on the surface of the flower-like spherical silver powder A2 was thinned. Therefore, the morphology and the size of the flower-shaped spherical silver powder can be effectively regulated and controlled by changing the surfactant, and the regulation and control mode is simple.
Example 3
The preparation method of the flower-like spherical silver powder provided in example 3 is substantially identical to the preparation method of the flower-like spherical silver powder provided in example 1, and the difference between them is that: example 3 the temperatures of the first solution and the second solution were controlled to be around 45 c instead of controlling the temperatures of the first solution and the second solution to be around 25 c. Accordingly, in example 3, the specific flow of the preparation method of the flower-shaped spherical silver powder can be as follows:
S41, preparing a first solution and a second solution, wherein the preparation method comprises the following steps: weighing 5kg of silver nitrate solid to prepare a silver nitrate solution with the mass fraction of 5%, so as to obtain a first solution; weighing 2.6kg of ascorbic acid solid, preparing a reducing agent solution with the mass fraction of 15%, adding 300g of polyvinylpyrrolidone as a dispersing agent into the reducing agent solution, adding 30g of sodium dodecyl benzene sulfonate as a surfactant, and uniformly stirring to obtain a second solution; the temperature of the first solution and the second solution was controlled to about 45 ℃.
S42, adding ammonia water into the second solution to adjust the pH value of the second solution to about 5, adding the second solution into the first solution under the stirring condition, and reacting for 10min after the addition is finished within 8min to obtain silver powder suspension.
S43, carrying out solid-liquid separation on silver powder suspension, cleaning the separated solid by using ultrapure water, and placing the cleaned solid in a 60 ℃ oven for baking for 120min to obtain a target product (namely, the flower-shaped spherical silver powder A3).
Specifically, as is known from the scanning electron microscope image (as shown in fig. 4) of the flower-like spherical silver powder A3, the flower-like spherical silver powder A3 is a sphere-like silver powder having a special flower-like structure. Further, as can be seen from comparing the sem image of the flower-like spherical silver powder A3 with the sem image of the flower-like spherical silver powder A1, that is, comparing fig. 4 and 2, the reaction temperature of the first solution and the second solution was changed in example 3, and the morphology and the size of the obtained flower-like spherical silver powder A3 were significantly changed, for example, the plate-like structure of the protrusions on the surface of the flower-like spherical silver powder A3 was lengthened. Therefore, the morphology and the size of the flower-shaped spherical silver powder can be effectively regulated and controlled by changing the reaction temperature, and the regulation and control mode is simple.
As can be seen from the above, according to the preparation method of the flower-shaped spherical silver powder provided by the embodiment, the first solution and the second solution are prepared, the first solution comprises silver nitrate, the second solution comprises a reducing agent, a dispersing agent and a surfactant, the pH value of the second solution is adjusted to a preset value, the second solution is added into the first solution to react to obtain a silver powder suspension, the preset value is 3-7, and then the flower-shaped spherical silver powder is separated from the silver powder suspension, and is of a flower-shaped structure, so that the flower-shaped spherical silver powder with a large specific surface area can be prepared by introducing the surfactant.
In order to better implement the preparation method of the flower-shaped spherical silver powder provided by the embodiment of the application, the embodiment of the application also provides the flower-shaped spherical silver powder (shown in fig. 2, 3 or 4), and the flower-shaped spherical silver powder is prepared by adopting the preparation method of the flower-shaped spherical silver powder provided by any embodiment.
In particular, the flower-shaped spherical silver powder has a larger specific surface area and higher sintering activity due to a rough surface and more protruding structures, and has a wide application prospect in the field of photovoltaic silver paste.
In some embodiments, the specific surface area of the flower-shaped spherical silver powder may be greater than or equal to 0.9m 2/g.
Moreover, it should be noted that, since the flower-shaped spherical silver powder in the embodiment of the present application is prepared by using the preparation method of the flower-shaped spherical silver powder provided in any one of the embodiments, the present embodiment has all the same beneficial effects, and is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
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