Laser curing type conductive silver ink for electronic components and preparation method of laser curing type conductive silver ink

Abstract

The invention discloses laser curing type conductive silver ink for electronic components and a preparation method of the laser curing type conductive silver ink. The laser curing type conductive silver ink comprises a silver precursor, an amine complexing agent, a non-polar organic solvent and an additive, a silver precursor and an amine complexing agent form a uniform and stable silver-amine complex solution in a non-polar organic solvent. The preparation method comprises the following steps: uniformly mixing a non-polar organic solvent, an amine complexing agent and an additive, then adding a silver precursor, stirring until the silver precursor is completely dissolved, and filtering to obtain the conductive silver ink with excellent conductivity, stability and printing performance. The invention also provides a method for preparing a conductive film on a substrate by using the conductive silver ink through a laser sintering process. According to the conductive silver ink, the light absorption characteristic of the silver-amine complex is regulated and controlled through the non-polar solvent, so that the conductive silver ink perfectly adapts to a laser sintering process, and the conductive silver ink has the advantages of being low in curing energy consumption, short in curing time, free of thermal damage to a flexible base material, high in conductivity of a formed silver film, high in adhesive force and the like, and is suitable for the fields of flexible electronics, printed circuits and the like.

Description

Technical Field

[0001] This invention relates to the field of printed electronic materials technology, and in particular to a method for preparing and applying laser-cured conductive silver ink. Background Technology

[0002] The field of microelectronics is booming, encompassing key devices such as active-matrix organic light-emitting diodes (AMOLEDs), thin-film transistors (TFTs), and radio frequency identification tags (RFID). In the field of flexible electronics and printed circuits, conductive silver ink serves as a core functional material, its performance directly determining the device's flexibility and conductivity reliability. An ideal conductive ink should meet core requirements such as low cost, no pollution, ease of preparation and storage, simple post-processing, and high conductivity.

[0003] Conductive inks are mainly divided into two categories: particulate and non-particulate. Particulate conductive inks (CN201710559121.3) suffer from problems such as easy agglomeration during storage and the need to add dispersants to maintain the stability of nanoparticles. However, the introduction of dispersants can lead to a decrease in conductivity, limiting their large-scale application and long-term stability. Non-particulate conductive inks are composed of precursors, complexing agents, solvents, and additives. In essence, they are complex systems formed by silver precursors and complexing agents. The silver precursor exists in the solvent in the form of a complex, avoiding the problem of printhead clogging caused by the agglomeration of silver nanoparticles and the complex synthesis and purification process. However, non-particulate conductive inks still face core bottlenecks: silver salts have poor solubility in most organic solvents, making it difficult to prepare a uniform and stable silver ink system. Furthermore, the high curing temperature (CN202011473758.9) and long curing time limit their application on flexible substrates such as paper and PET.

[0004] Laser sintering technology, as a novel curing method, boasts significant advantages such as concentrated energy, rapid heating, small heat-affected zone, and low damage to flexible substrates, making it a key technology for achieving efficient printed electronics production. However, existing particle-free conductive inks are mostly designed for traditional thermosetting methods. The light absorption and thermal decomposition characteristics of their components (such as solvents and complexing agents) are incompatible with laser light sources, leading to inefficient decomposition and reduction under laser radiation, or problems such as the "coffee ring effect" and film cracking, making it difficult to form a uniform, highly conductive silver film. Therefore, developing a particle-free conductive silver ink highly compatible with laser sintering processes has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] To address the aforementioned issues, this invention aims to develop a low-cost, high-performance, particle-free conductive silver ink highly compatible with laser sintering processes. The core idea of ​​this invention is to utilize a branched silver carboxylate precursor and precisely control the solvent system and complexing components of the ink to construct a silver complex system with high absorption for specific wavelength lasers and rapid decomposition and reduction under low-energy irradiation, thus perfectly matching the laser sintering process. The branched alkyl chains have a larger spatial volume than straight-chain alkyl chains, effectively weakening the lattice energy between silver salt molecules, reducing the density of molecular packing, and resulting in silver amine complexes with better solubility in solvents. Traditional conductive silver ink systems typically use polar solvents to dissolve silver salts, but the resulting silver complexes have low laser absorption efficiency and a wide thermal decomposition temperature window, making instantaneous and complete reduction difficult under the instantaneous high temperatures of lasers. This invention innovatively uses non-polar solvents to construct the system. First, based on the principle of "like dissolves like," the long carbon chain "hydrophobic shielding layer" on the outside of the silver amine complex exhibits excellent compatibility with non-polar solvents, enabling stable dissolution of silver salts at high concentrations and forming a uniform and stable particle-free ink system. Second, and more importantly, the non-polar solvent environment can alter the coordination geometry of the silver amine complex (e.g., from 2-coordinate to 3- or 4-coordinate), which not only lowers its thermal decomposition temperature but, more importantly, enhances its photon absorption efficiency for specific wavelength lasers. This allows it to rapidly and uniformly decompose and reduce to metallic silver under low-energy laser irradiation, perfectly matching the "rapid heating and cooling" process characteristics of laser sintering and avoiding substrate damage and the "coffee ring effect" common in thermal curing. Furthermore, non-polar solvents have better wettability with commonly used low surface energy flexible substrates (such as PET and PI), significantly enhancing the adhesion between the silver film and the substrate. Therefore, this invention provides a method for preparing laser-curable conductive silver ink for electronic components. This ink exhibits strong stability, high compatibility with laser sintering processes, and a simple preparation method, making it easy to achieve industrial production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A particle-free conductive silver ink, the raw materials of which include a silver precursor, an amine complexing agent, a non-polar organic solvent and additives, wherein the silver precursor and the amine complexing agent form a uniform and stable silver-amine complex solution in a non-polar organic solvent.

[0007] Furthermore, the raw materials are expressed in the following percentages by mass: silver precursor: 42-65%, amine complexing agent: 5-23%, non-polar organic solvent: 15-50%, additives: 0.1-2%, and the sum of the percentages of each raw material is 100%.

[0008] Further, an example of the silver precursor synthesis steps: Sodium hydroxide solution is slowly added dropwise to an equimolar amount of neodecanoic acid-methanol solution to adjust the pH to 7-8, and stirred for 30 min. Then, an equimolar amount of silver nitrate solution is slowly added dropwise, the mixture is cooled in a water bath, and stirred for 30 min to generate a white precipitate of silver neodecanoate. The stirring speed is 1000 rpm throughout the process. The white precipitate is collected by filtration, washed three times with deionized water, washed three times with anhydrous methanol, and finally placed in a vacuum drying oven at 45°C for 12 h.

[0009] Furthermore, the silver precursor is at least one of silver 2-ethylhexanoate, silver neopentanoate, silver 3,5,5-trimethylhexanoate, and silver neodecanoate.

[0010] Furthermore, the amine complexing agent includes at least one selected from n-propylamine, isopropylamine, n-butylamine, isobutylamine, n-hexylamine, octylamine, ethylenediamine, 1,2-propanediamine, ethanolamine, diethanolamine, and triethanolamine. The amine complexing agent contains a ligand capable of complexing with silver.

[0011] Furthermore, the nonpolar organic solvent includes at least one of toluene, o-xylene, m-xylene, p-xylene, 1,2,3-trimethylbenzene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, heptene, octene, nonene, decene, 1-dodecene, dodecane, tetradecane, and 1,6-hexanediol diacrylate. These solvents not only have high solubility for silver-amine complexes but also good transmittance or weak absorption at commonly used laser wavelengths, which facilitates the direct application of laser energy to the silver-amine complex and improves energy utilization efficiency.

[0012] Furthermore, the additives include rheology modifiers: hydrophobic nano-silica, polyamide wax, hydrogenated castor oil, organobentonite, ethyl cellulose; cosolvents: dibutyl phthalate, diethylene glycol dibutyl ether, α-terpineol, hexadecane, neodecanoic acid; dispersing stabilizers: PVP-K16-18; chelating agents: acetylacetone; thickeners: polyvinyl alcohol; adhesion promoters: 3-aminopropyltriethoxysilane; and surfactants: at least one of oleamide and FC-4430.

[0013] The present invention also provides a method for preparing the laser-curable particle-free conductive silver ink, comprising the following steps: mixing an amine complexing agent, a non-polar organic solvent and an additive, and stirring until homogeneous; then adding a silver precursor and stirring continuously until it is completely dissolved to form a silver-amine complex; finally filtering to obtain the particle-free conductive silver ink suitable for laser sintering.

[0014] Furthermore, the filtration involves passing the finally completely dissolved mixture through a syringe-type filter membrane with a pore size of 0.22 μm to remove any residual impurities.

[0015] The present invention also provides a method for preparing a conductive film on a substrate using the conductive silver ink, comprising the following steps: coating the conductive silver ink onto the surface of the substrate; and using a laser beam to scan and sinter the substrate coated with conductive silver ink, thereby decomposing and reducing the silver-amine complex to form a conductive film.

[0016] Furthermore, the coating method is either printing or film coating. Printing includes one of inkjet printing, screen printing, gravure printing, letterpress printing, or flexographic printing; film coating includes one of squeegee coating, spin coating, spray coating, or dip coating.

[0017] Furthermore, the substrate is a flexible polyethylene terephthalate film (PET) or a polyimide film (PI).

[0018] Furthermore, the parameters of the laser sintering process are: 355nm ultraviolet laser, laser energy 0.36-0.42W, and sintering time 1-3min. Excessive curing energy accelerates film formation, leading to numerous pores on the surface, or the solvent rapidly accelerates the evaporation process as temperature rises, with faster evaporation rates at the edges. To compensate for the rapid solvent loss at the edges, the liquid inside the droplets flows from the center to the edges, resulting in the "coffee ring effect," causing uneven distribution of the conductive film and reducing its conductivity. Insufficient curing temperature prevents the required sintering energy from being reached, resulting in incomplete decomposition and reduction reactions. This invention, through optimized matching of laser energy and time, ensures efficient decomposition of the silver-amine complex in a non-polar solvent environment, forming a dense, uniform, and highly conductive silver film, while avoiding thermal damage to the flexible substrate.

[0019] By adopting the aforementioned technical solution, the beneficial effects of the present invention are as follows: The particle-free conductive silver ink of the present invention has a simple preparation process, is easy to industrialize, and saves raw material costs.

[0020] The particle-free conductive silver ink of this invention uses a non-polar solvent system to regulate the coordination structure and light absorption characteristics of the silver-amine complex, giving it high absorption efficiency and rapid decomposition and reduction capabilities for lasers. This perfectly matches the "fast heating and cooling" process characteristics of laser sintering, significantly shortening the curing time (in minutes).

[0021] The conductive film of this invention has high quality. The instantaneous high energy of the laser enables the silver complex to nucleate and grow rapidly, resulting in a dense and uniform film that effectively avoids the "coffee ring effect" common in thermosetting, thereby achieving high conductivity.

[0022] The particle-free conductive silver ink of this invention has low curing energy consumption and minimal damage to the substrate: the laser sintering energy required for conductive silver ink is low (0.36-0.42W), and it can quickly reduce the silver film at low temperatures. It is particularly suitable for flexible materials such as PET and PI that are not resistant to high temperatures, greatly expanding its application in the field of flexible electronics.

[0023] The conductive film of the present invention has strong adhesion, and the non-polar solvent has excellent wettability on flexible substrates with low surface energy (such as PET and PI), which significantly enhances the adhesion between the conductive film and the substrate after curing.

[0024] The particle-free conductive silver ink of the present invention has good stability. The non-polar solvent has excellent dissolving ability for silver-amine complex. The resulting particle-free ink system is highly stable, can be stored for a long time, and does not clog the printhead. Attached Figure Description

[0025] Figure 1 The images show the XRD patterns of the conductive silver inks prepared in Examples 1-6. Ink a represents Example 1; Ink b represents Example 2; Ink c represents Example 3; Ink d represents Example 4; Ink e represents Example 5; and Ink f represents Example 6.

[0026] Figure 2 SEM images of the silver films prepared in Examples 1-6: a is Example 1; b is Example 2; c is Example 3; d is Example 4; e is Example 5; f is Example 6.

[0027] Figure 3 This is a structural comparison diagram of silver neodecanoate and silver octadecanate. Detailed Implementation

[0028] To make the above-mentioned features and advantages of the present invention more apparent and understandable, specific embodiments are described below in detail. Unless otherwise specified, the methods of the present invention are conventional methods in the art. Example 1

[0029] First, 0.8500g of o-xylene, 0.0200g of organobentonite, 0.0200g of α-terpineol, and 0.2200g of n-propylamine were mixed and stirred for 30 minutes. Then, 1.0000g of silver neodecanoate precursor was added to the mixture, and the mixture was stirred for 3 hours until completely dissolved. The resulting transparent solution was filtered through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. The silver neodecanoate conductive ink was uniformly coated onto a PET flexible material by spin coating. Subsequently, sintering was performed using a 355nm ultraviolet laser with a laser output energy of 0.36W and an irradiation time of 1 minute. Under laser irradiation, the silver-amine complex instantly absorbed the light energy and rapidly decomposed and reduced, forming a continuous and dense conductive silver film. The obtained silver film was tested and found to have a thickness of 150 nm, a resistivity of 8.91 μΩ·cm, and an adhesion test result (3M tape test) of 5B, indicating that it has excellent conductivity and substrate adhesion. Figure 1 The XRD pattern showed that the conductive film after laser sintering was clean and contained no other diffraction peaks. Figure 2 SEM revealed that conductive silver ink was laser-sintered to form a dense conductive film. Example 2

[0030] First, 0.9000g of m-xylene, 0.0100g of hydrophobic nano-fumed silica, 0.0200g of dibutyl phthalate, 0.0100g of acetylacetone, and 0.2250g of isopropylamine were mixed and stirred for 30 minutes. Then, 1.0000g of silver neodecanoate precursor was added to the mixture, and the mixture was stirred for 3 hours until completely dissolved. The resulting transparent solution was filtered through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. The silver neodecanoate conductive ink was uniformly coated onto a PET flexible material by spin coating. Sintering was performed using a 355nm ultraviolet laser with a laser output energy of 0.38W and an irradiation time of 2 minutes. The resulting silver film thickness was 120nm, the resistivity was 8.62μΩ·cm, and the adhesion test result was 5B. Figure 1 The XRD pattern showed that the conductive film after laser sintering was clean and contained no other diffraction peaks. Figure 2 SEM revealed that conductive silver ink was laser-sintered to form a dense conductive film. Example 3

[0031] First, 0.7500g of 1,3,5-trimethylbenzene, 0.0100g of polyamide wax, 0.0200g of diethylene glycol dibutyl ether, 0.0100g of PVP-K16-18, and 0.2650g of n-butylamine were mixed and stirred for 30 minutes. Then, 1.0000g of silver neodecanoate precursor was added to the mixture, and the mixture was stirred for 3 hours until completely dissolved. The resulting semi-transparent solution was filtered through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. The silver neodecanoate conductive silver ink was uniformly coated onto a PET flexible material by spin coating. Sintering was performed using a 355nm ultraviolet laser with a laser output energy of 0.36W and an irradiation time of 1 minute. The resulting silver film thickness was 50nm, the resistivity was 7.42μΩ·cm, and the adhesion test result was 5B. Figure 1 The XRD pattern showed that the conductive film after laser sintering was clean and contained no other diffraction peaks. Figure 2 SEM revealed that conductive silver ink was laser-sintered to form a dense conductive film. Example 4

[0032] First, 0.6500g heptenene, 0.0100g ethyl cellulose, 0.0100g dibutyl phthalate, 0.0100g neodecanoic acid, 0.0100g PVP-K16-18, and 0.3400g isobutylamine were mixed and stirred until homogeneous. Then, 1.0000g of silver neodecanoate precursor was added to the mixture, and the mixture was stirred for 3 hours until completely dissolved. The resulting semi-transparent solution was filtered through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. The silver neodecanoate conductive ink was spin-coated uniformly onto a flexible PET material, and sintering was performed using a 355nm ultraviolet laser with a laser output energy of 0.36W and an irradiation time of 1 minute. The resulting silver film thickness was 150nm, resistivity was 10.72μΩ·cm, and adhesion was rated at 5B. pass Figure 1 The XRD pattern showed that the conductive film after laser sintering was clean and contained no other diffraction peaks. Figure 2 SEM revealed that conductive silver ink was laser-sintered to form a dense conductive film. Example 5

[0033] First, 0.5200g octene, 0.0100g ethyl cellulose, 0.0100g neodecanoic acid, 0.0100g acetylacetone, and 0.3650g n-hexylamine were mixed and stirred for 30 minutes until homogeneous. Then, 1.0000g silver neodecanoate precursor was added to the mixture, and the mixture was stirred for 3 hours until completely dissolved. The resulting semi-transparent solution was filtered through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. The silver neodecanoate conductive ink was spin-coated uniformly onto a flexible PET material, and sintering was performed using a 355nm ultraviolet laser with a laser output energy of 0.36W and an irradiation time of 1 minute. The resulting silver film thickness was 200nm, resistivity was 13.35μΩ·cm, and adhesion was rated at 4B. Figure 1 The XRD pattern showed that the conductive film after laser sintering was clean and contained no other diffraction peaks. Figure 2 SEM revealed that conductive silver ink was laser-sintered to form a dense conductive film. Example 6

[0034] First, 0.7800g of nonene, 0.0050g of hydrophobic nano-silica, 0.0150g of hexadecane, 0.0100g of diethylene glycol dibutyl ether, 0.0050g of acetylacetone, and 0.1080g of ethylenediamine were mixed evenly. Then, 1.0000g of silver neodecanoate precursor was added to the mixture, and the mixture was stirred for 3 hours until completely dissolved. The resulting semi-transparent solution was filtered through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. The silver neodecanoate conductive silver ink was uniformly coated onto a PET flexible material by spin coating. Sintering was performed using a 355nm ultraviolet laser with a laser output energy of 0.36W and an irradiation time of 2 minutes. The resulting silver film thickness was 250nm, the resistivity was 18.62μΩ·cm, and the adhesion test result was 4B. Figure 1 The XRD pattern showed that the conductive film after laser sintering was clean and contained no other diffraction peaks. Figure 2 SEM revealed that conductive silver ink was laser-sintered to form a dense conductive film. Example 7

[0035] First, mix 0.5800g decene, 0.0100g organobentonite, 0.0100g neodecanoic acid, 0.0050g dibutyl phthalate, 0.0100g acetylacetone, and 0.3800g n-hexylamine, and stir for 30 minutes until homogeneous. Then, add 1.0000g of silver neodecanoate precursor to the mixture and stir for 3 hours until completely dissolved. Filter the resulting semi-transparent solution through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. Spin-coat the silver neodecanoate conductive silver ink uniformly onto a flexible PET material. Sinter using a 355nm ultraviolet laser with a laser output energy of 0.38W and an irradiation time of 1 minute. The tested silver film had a thickness of 150 nm, a resistivity of 15.63 μΩ·cm, and an adhesion test result of 4B. Example 8

[0036] First, 0.8900g of dodecane, 0.0100g of ethyl cellulose, 0.0100g of diethylene glycol dibutyl ether, and 0.2200g of ethanolamine were mixed and stirred for 30 minutes to ensure homogeneity. Then, 1.0000g of silver neodecanoate precursor was added to the mixture, and the mixture was stirred for 3 hours until completely dissolved. The resulting semi-transparent solution was filtered through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. The silver neodecanoate conductive ink was spin-coated uniformly onto a flexible PET material, and sintering was performed using a 355nm ultraviolet laser with a laser output energy of 0.38W and an irradiation time of 2 minutes. The resulting silver film thickness was 150nm, the resistivity was 12.63μΩ·cm, and the adhesion test result was 4B. Example 9

[0037] First, 0.9500g tetradecane, 0.0050g organobentonite, 0.0100g dibutyl phthalate, 0.0100g acetylacetone, 0.0100g polyvinyl alcohol, 0.0100g FC-4430, and 0.3790g diethanolamine were mixed and stirred for 30 minutes to ensure homogeneity. Then, 1.0000g of silver neodecanoate precursor was added to the mixture, and the mixture was stirred for 3 hours until completely dissolved. The resulting semi-transparent solution was then filtered through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. The silver neodecanoate conductive ink was spin-coated uniformly onto a flexible PET material, and sintering was performed using a 355nm ultraviolet laser with a laser output energy of 0.40W and an irradiation time of 1 minute. The tested silver film had a thickness of 200 nm, a resistivity of 20.25 μΩ·cm, and an adhesion test result of 4B. Example 10

[0038] First, 0.6600g of o-xylene, 0.0100g of hydrogenated castor oil, 0.0100g of acetylacetone, 0.0100g of oleamide, and 0.2650g of n-butylamine were mixed evenly and stirred for 30 minutes. Then, 1.0000g of silver neodecanoate precursor was added to the mixture, and the mixture was stirred for 3 hours until completely dissolved. The resulting semi-transparent solution was filtered through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable, particle-free conductive silver oil. The silver neodecanoate conductive ink was spin-coated evenly onto a PET flexible material, and sintering was performed using a 355nm ultraviolet laser with a laser output energy of 0.36W and an irradiation time of 3 minutes. The resulting silver film thickness was 120nm, the resistivity was 9.38μΩ·cm, and the adhesion test result was 5B. Example 11

[0039] First, add 0.6000g nonene, 0.3500g p-xylene, 0.0100g hydrogenated castor oil, 0.0120g hexadecane, 0.0080g oleamide, and 0.3650g n-hexylamine, mix, and stir for 30 minutes to ensure homogeneity. Then, add 1.0000g of silver neodecanoate precursor to the mixture and stir for 3 hours until completely dissolved. Filter the resulting semi-transparent solution through a 0.22μm syringe filter membrane. This solution is the prepared low-temperature curable particle-free conductive silver ink. Spin-coat the silver neodecanoate conductive silver ink uniformly onto a PET flexible material. Sinter using a 355nm ultraviolet laser with a laser output energy of 0.38W and an irradiation time of 2 minutes. The resulting silver film thickness was 150nm, resistivity was 7.35μΩ·cm, and adhesion was 5B.

[0040] Comparative Example First, 0.8500g of o-xylene, 0.0200g of organobentonite, 0.0200g of α-terpineol and 0.2200g of n-propylamine were mixed and stirred for 30 minutes. Then, 1.0000g of silver octanoate precursor was added to the mixed solution and stirred for 3 hours. A white precipitate was still present, indicating that the silver amine complex formed by the complexation of the straight-chain alkyl chain silver precursor and the amine complexing agent has poor solubility in non-polar solvents.

[0041] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser-curable conductive silver ink for electronic components, characterized in that: The raw materials include a silver precursor, an amine complexing agent, a non-polar organic solvent, and additives; the mass percentages of the raw materials are as follows: silver precursor: 42-65%, amine complexing agent: 5-23%, non-polar organic solvent: 15-50%, and additives: 0.1-2%, with the sum of the mass percentages of each raw material being 100%; wherein the silver precursor and the amine complexing agent form a uniform and stable silver-amine complex solution in the non-polar organic solvent.

2. The laser-curable conductive silver ink for electronic components according to claim 1, characterized in that: The silver precursor is at least one of silver 2-ethylhexanoate, silver neopentanoate, silver 3,5,5-trimethylhexanoate, and silver neodecanoate.

3. The laser-curable conductive silver ink for electronic components according to claim 1, characterized in that: The amine complexing agent includes at least one of the following: n-propylamine, isopropylamine, n-butylamine, isobutylamine, n-hexylamine, octylamine, ethylenediamine, 1,2-propanediamine, ethanolamine, diethanolamine, and triethanolamine.

4. The laser-curable conductive silver ink for electronic components according to claim 1, characterized in that: The nonpolar organic solvent includes at least one of toluene, o-xylene, m-xylene, p-xylene, 1,2,3-trimethylbenzene, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, heptene, octene, nonene, decene, 1-dodecene, dodecane, tetradecane, and 1,6-hexanediol diacrylate.

5. The method for preparing laser-cured conductive silver ink for electronic components according to claim 1, characterized in that: The additives include at least one of rheology modifiers, cosolvents, dispersants, chelating agents, thickeners, adhesion promoters, and surfactants.

6. The laser-curable conductive silver ink for electronic components according to claim 1, characterized in that: The rheology modifier is at least one of hydrophobic nano-silica, polyamide wax, hydrogenated castor oil, organobentonite, and ethyl cellulose; the cosolvent is at least one of dibutyl phthalate, diethylene glycol dibutyl ether, α-terpineol, hexadecane, and neodecanoic acid; the dispersing stabilizer is PVP-K16-18; the chelating agent is acetylacetone; the thickener is polyvinyl alcohol; the adhesion promoter is 3-aminopropyltriethoxysilane; and the surfactant is at least one of oleamide and FC-4430.

7. The method for preparing laser-curable conductive silver ink for electronic components according to any one of claims 1-6, characterized in that... After mixing amine complexing agents, nonpolar organic solvents and additives, silver precursors are added and stirred continuously until completely dissolved to form silver-amine complexes. The mixture is then filtered to obtain the particle-free conductive silver ink suitable for laser sintering.

8. The method for obtaining a conductive film by laser curing of laser-curable conductive silver ink for electronic components according to any one of claims 1-6, characterized in that: The conductive silver ink is coated onto a substrate and then cured using a laser.

9. The method according to claim 8, characterized in that, The coating method is printing or coating film; the substrate is a flexible material, such as polyimide film or polyethylene terephthalate film.

10. The method according to claim 8, characterized in that, The curing process is laser sintering, using a 355nm ultraviolet laser with a laser curing energy of 0.36-0.42W and a curing time of 1-3 minutes.

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