Nanotechnology-based intelligent packaging and method for preparing the same

Abstract

The application provides a kind of intelligent packaging based on nanotechnology and its preparation method, belongs to the field of intelligent printing, and the intelligent packaging includes: packaging substrate, nanometer material solution and chip;Nanometer material solution is coated on the inner surface of the packaging substrate;Nanometer material solution includes nanometer silver particle solution, nanometer silicon dioxide particle solution and nanometer zirconium oxide particle solution;Chip is arranged on the inner surface of the packaging substrate and is in contact with nanometer material solution;Chip is used to detect the electrical signal of nanometer material solution, and according to the electrical signal, the temperature, humidity and oxygen concentration inside the packaging substrate are determined, and the temperature, humidity and oxygen concentration inside the packaging substrate are uploaded to the cloud storage.The application can monitor the temperature, humidity and oxygen concentration inside the packaging in real time, and realize intelligent control and management of the internal environment of the packaging.

Description

Technical Field

[0001] This invention relates to the field of smart printing, and in particular to a smart packaging based on nanotechnology and its preparation method. Background Technology

[0002] As people's demands for product quality and safety continue to rise, the packaging industry is also constantly innovating. To ensure product quality and safety, packaging not only needs to provide protection and containment functions, but also needs to possess intelligent features to monitor, track, and manage products. Therefore, developing intelligent packaging based on nanotechnology is of great significance. Summary of the Invention

[0003] The purpose of this invention is to provide a smart packaging based on nanotechnology and its preparation method, which can monitor the temperature, humidity and oxygen concentration inside the packaging in real time.

[0004] To achieve the above objectives, the present invention provides a smart packaging based on nanotechnology, comprising: a packaging substrate, a nanomaterial solution, and a chip;

[0005] The nanomaterial solution is coated on the inner surface of the packaging substrate; the nanomaterial solution includes nano silver particle solution, nano silica particle solution and nano zirconium oxide particle solution;

[0006] The chip is disposed on the inner surface of the packaging substrate and is in contact with the nanomaterial solution. The chip is used to detect the electrical signal of the nanomaterial solution and determine the temperature, humidity and oxygen concentration inside the packaging substrate based on the electrical signal, and upload the temperature, humidity and oxygen concentration inside the packaging substrate to the cloud for storage. The electrical signal of the nanomaterial solution includes the resistance of the nano silver particle solution, the capacitance of the nano silica particle solution and the resistance of the nano zirconium oxide particle solution.

[0007] To achieve the above objectives, the present invention also provides a method for preparing a smart packaging based on nanotechnology, used to prepare the aforementioned smart packaging based on nanotechnology. The method for preparing the smart packaging based on nanotechnology includes:

[0008] Preparation of nanomaterial solutions; the nanomaterial solutions include solutions of silver nanoparticles, silica nanoparticles, and zirconium nanoparticles.

[0009] The nanomaterial solution is coated onto the inner surface of the packaging substrate;

[0010] Chips are placed on the inner surface of a packaging substrate coated with a nanomaterial solution;

[0011] The electrical signals of the nanomaterial solution are detected by the chip, and the temperature, humidity and oxygen concentration inside the packaging substrate are determined based on the electrical signals. The temperature, humidity and oxygen concentration inside the packaging substrate are then uploaded to the cloud for storage. The electrical signals of the nanomaterial solution include the resistance of the nano silver particle solution, the capacitance of the nano silica particle solution and the resistance of the nano zirconium oxide particle solution.

[0012] Optionally, the preparation of a nanomaterial solution specifically includes:

[0013] A solution of silver nanoparticles was prepared by chemical reduction.

[0014] A solution of nano-silica particles was prepared by hydrolysis reaction;

[0015] A solution of nano-zirconia particles was prepared by hydrolysis reaction;

[0016] The nano-silver particle solution, the nano-silica particle solution, and the nano-zirconia particle solution are mixed and dispersed in a solvent to obtain a nanomaterial solution.

[0017] Optionally, a solution of silver nanoparticles is prepared using a chemical reduction method, specifically including:

[0018] The silver salt is dissolved in a solvent to dilute and dissolve the silver salt, thus obtaining a silver salt solution;

[0019] The reducing agent is dissolved in a solvent to obtain a reducing agent solution;

[0020] The silver salt solution and the reducing agent solution are mixed evenly, so that the reducing agent in the reducing agent solution reacts chemically with the silver ions in the silver salt solution, reducing the silver ions into nano-sized silver particles, thus obtaining a nano-silver particle solution.

[0021] Optionally, a solution of nano-silica particles is prepared via a hydrolysis reaction, specifically including:

[0022] The silica precursor is dissolved in a solvent to obtain a silica precursor solution;

[0023] The silica precursor solution was added dropwise to water and stirred to cause a hydrolysis reaction in the silica precursor solution. After the hydrolysis reaction was completed, nano-silica particles were obtained.

[0024] The nano-silica particles are washed;

[0025] The washed nano-silica particles are dispersed and dissolved in a solvent to obtain a nano-silica particle solution.

[0026] Optionally, a solution of nano-zirconia particles is prepared via a hydrolysis reaction, specifically including:

[0027] The zirconia precursor was dissolved in a solvent to obtain a zirconia precursor solution;

[0028] A surfactant is added to the zirconium oxide precursor solution;

[0029] The zirconium oxide precursor solution with added surfactant was added dropwise to water and stirred to generate nano-zirconia particles;

[0030] The nano-zirconia particles are washed;

[0031] The washed nano-zirconia particles were dispersed and dissolved in a solvent to obtain a nano-zirconia particle solution.

[0032] Optionally, the solvent is water or ethanol.

[0033] Optionally, before the step of setting the chip on the inner surface of the packaging substrate coated with the nanomaterial solution, the method for preparing the smart packaging based on nanotechnology further includes: printing a trademark design pattern on the outer surface of the packaging substrate coated with the nanomaterial solution and performing die-cutting.

[0034] Optionally, a chip is disposed on the inner surface of a packaging substrate coated with a nanomaterial solution, specifically including: applying a conductive adhesive to the contact area between the packaging substrate coated with the nanomaterial solution and the chip, attaching the chip to the contact area, and pressing the chip and the packaging substrate together.

[0035] According to specific embodiments provided by the present invention, the following technical effects are disclosed: Based on the thermosensitive properties of nanomaterials, the present invention enables real-time monitoring of temperature, humidity, and oxygen concentration inside the packaging by applying nanomaterials to packaging materials. Simultaneously, by applying chips to the packaging, parameters inside the packaging can be collected and transmitted. Through analysis and processing of the collected parameters, intelligent control and management of the internal environment of the packaging can be achieved. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart illustrating the preparation method of the nanotechnology-based smart packaging provided by this invention. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] The purpose of this invention is to provide a smart packaging based on nanotechnology and its preparation method, which can realize real-time monitoring of parameters such as internal temperature, humidity, and oxygen concentration, and can transmit data to remote devices through wireless transmission technology, providing a more intelligent, safe, and environmentally friendly solution for the packaging industry.

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] The smart packaging based on nanotechnology provided by this invention includes: a packaging substrate, a nanomaterial solution, and a chip.

[0042] The nanomaterial solution is coated on the inner surface of the packaging substrate. The nanomaterial solution includes a solution of silver nanoparticles, a solution of silica nanoparticles, and a solution of zirconium nanoparticles.

[0043] The chip is disposed on the inner surface of the packaging substrate and is in contact with the nanomaterial solution. The chip is used to detect the electrical signal of the nanomaterial solution and, based on the electrical signal, determine the temperature, humidity, and oxygen concentration inside the packaging substrate, and upload the temperature, humidity, and oxygen concentration inside the packaging substrate to cloud storage. The electrical signal of the nanomaterial solution includes the resistance of the silver nanoparticle solution, the capacitance of the silica nanoparticle solution, and the resistance of the zirconium nanoparticle solution.

[0044] This invention is primarily based on the thermosensitive properties of nanomaterials and sensor technology. By applying nanomaterials to packaging materials, parameters such as temperature, humidity, and oxygen concentration inside the packaging can be monitored in real time. Simultaneously, by applying sensor technology (chips) to the packaging, parameters inside the packaging can be collected and transmitted. Through analysis and processing of these parameters, intelligent control and management of the packaging's internal environment can be achieved.

[0045] Furthermore, such as Figure 1 As shown, the present invention also provides a method for preparing the above-mentioned nanotechnology-based smart packaging, comprising:

[0046] S1: Preparation of nanomaterial solutions. The nanomaterial solutions include solutions of silver nanoparticles, silica nanoparticles, and zirconium nanoparticles.

[0047] Furthermore, S1 includes:

[0048] S11: A solution of nano-silver particles was prepared by chemical reduction.

[0049] The resistance of silver nanoparticles varies with temperature. Specifically, temperature affects the scattering of electrons between the conductive material and the crystal lattice. At room temperature, the resistance of a conductive material is mainly determined by electron-electron scattering, electron-lattice scattering, and impurity scattering. As the temperature increases, lattice vibrations intensify, leading to increased electron-lattice scattering and thus increased resistance. Therefore, temperature changes can be monitored in real time by measuring the resistance of silver nanoparticles.

[0050] Specifically, (1) silver salt (such as silver nitrate AgNO3) is dissolved in an appropriate amount of solvent to dilute and dissolve the silver salt, thus obtaining a silver salt solution. Water and ethanol are common solvents, and their function is to dilute and dissolve materials. Deionized water is usually used to dissolve silver salt. Deionized water is pure water that has undergone deionization treatment and contains almost no dissolved ions and impurities. Its main component is H2O molecules.

[0051] (2) The reducing agent (such as glucose C6H) 12 O6 is dissolved in a solvent (such as deionized water) to obtain a reducing agent solution.

[0052] (3) Mix the silver salt solution and the reducing agent solution evenly, so that the reducing agent in the reducing agent solution reacts chemically with the silver ions in the silver salt solution, reducing the silver ions to nano-sized silver particles, and obtaining a nano-silver particle solution.

[0053] The ratio of silver salt solution to reducing agent solution can be adjusted according to the required concentration and size of silver nanoparticles. Higher concentrations of silver nanoparticles result in a more continuous conductive network and smoother current conduction paths, thus reducing overall resistance. Conversely, lower concentrations lead to more breaks and gaps in the conductive network, increasing resistance. Smaller silver nanoparticles have higher specific surface areas and more grain boundaries, increasing the number of conductive paths and reducing overall resistance. Larger particles have fewer grain boundaries, resulting in fewer conductive paths and relatively higher overall resistance. The concentration and size of silver nanoparticles can affect the sensor's sensitivity and response speed. Higher concentrations and larger particles enhance the sensor's sensitivity to temperature changes, enabling more accurate detection of minute temperature variations. However, excessively high concentrations and large particles may lead to enhanced interparticle interactions, aggregation, or even particle agglomeration or deposition, affecting the sensor's performance stability and reliability. Therefore, optimization of the silver nanoparticle concentration is necessary to ensure a balance in sensor performance. The particle size and dispersibility of silver nanoparticles can be controlled by adjusting reaction conditions such as temperature, pH, and concentration.

[0054] The stirring speed during the preparation of the silver nanoparticle solution is adjusted according to the solution viscosity and reaction rate. The reaction temperature is generally carried out at room temperature, but heating or cooling can be performed as needed. The reaction time is adjusted according to the reaction rate and the desired size of the silver nanoparticles.

[0055] S12: A solution of nano-silica particles was prepared by hydrolysis reaction.

[0056] The capacitance of nano-silica particles changes with humidity. Specifically: ① Hygroscopicity of silica particles: The surface of silica particles has a layer of hydroxide (Si-OH) groups. These groups can interact with water molecules through hydrogen bonding. Under low humidity conditions, the hydroxide groups on the surface of silica particles adsorb fewer water molecules. At this time, the charge separation between particles is greater, resulting in a higher electric field strength and a smaller capacitance. Under high humidity conditions, the hydroxide groups on the surface of silica particles adsorb more water molecules. The polarity of water molecules reduces the charge separation between particles, resulting in a lower electric field strength and an increased capacitance. ② Changes in the dielectric constant of silica particles: Humidity changes also affect the capacitance by altering the dielectric constant within the silica particles. Under low humidity conditions, silica particles exhibit a lower dielectric constant, resulting in a smaller capacitance. Under high humidity conditions, the increased adsorption of water molecules increases the dielectric constant within the silica particles, thus increasing the capacitance. Based on these two factors, as humidity increases, more water molecules are adsorbed on the surface of silica particles, reducing surface charge separation and increasing the dielectric constant inside the particles, thus gradually increasing the capacitance. Conversely, as humidity decreases, the capacitance gradually decreases.

[0057] Specifically, (1) a silica precursor (such as tetraethyl orthosilicate Si(OC2H5)4) is dissolved in a solvent (such as ethanol C2H5OH) to obtain a silica precursor solution. Ethanol has higher volatility than water, and adding ethanol can adjust the solubility and concentration of the reaction solution, and also helps to control the morphology and size of the particles. As an organic solvent, ethanol has good solubility and volatility, which can effectively dissolve the silica precursor and provide a suitable environment for hydrolysis. In addition, ethanol can also prevent the aggregation and agglomeration of particles. During the preparation of the silica particle solution, water will cause the particles to aggregate and agglomerate, resulting in a decrease in dispersion uniformity.

[0058] (2) The silica precursor solution is slowly added dropwise to water while stirring to induce a hydrolysis reaction. After the hydrolysis reaction is complete, nano-silica particles are obtained. Specifically, the hydroxyl groups of tetraethyl orthosilicate react with water to generate silanol, which then gradually forms silica gel through a condensation reaction. Stirring is used to promote uniform reaction and prevent the gel particles from becoming too large and agglomerating. Controlling the dropping rate and stirring conditions can affect the morphology and size of the particles.

[0059] The ratio of silica precursor solution to water can be adjusted according to the required concentration and size of nano-silica particles.

[0060] (3) The nano-silica particles are washed. After the hydrolysis reaction is complete, the formed nano-silica particles will precipitate. Next, the precipitated nano-silica particles are washed with an appropriate amount of solvent (such as ethanol) to remove impurities and residual solvent from the reaction products. Washing can be carried out by centrifugation, dispersion and resuspension, and repeated washing to ensure the purity and stability of the nano-silica particles.

[0061] (4) Dissolve the washed nano-silica particles in a solvent (such as water) to obtain a nano-silica particle solution. This step is mainly to ensure that the nano-silica particles are uniformly suspended in the solvent, which facilitates subsequent applications. By adjusting the concentration and pH value of the solvent, the dispersibility, stability and particle size distribution of the nano-silica particles can be further controlled.

[0062] The stirring speed during the preparation of the nano-silica particle solution is adjusted according to the solution viscosity and reaction rate. The size of the nano-silica particles is controlled by adjusting the dropping rate of the silica precursor solution. The reaction temperature is generally at room temperature, but heating or cooling can be performed as needed. The reaction time is adjusted according to the reaction rate and the desired nano-silica particle size.

[0063] S13: Preparation of nano-zirconia particle solution via hydrolysis reaction.

[0064] The electrical resistance of zirconia particles changes with oxygen concentration. Specifically, zirconia particles are a common oxide material with good electrical conductivity. In an oxygen-rich environment, the surface of zirconia undergoes an oxidation reaction with oxygen, forming a higher oxidation state of zirconium, namely ZrO2. The chemical equation for this oxidation reaction is: 2Zr + O2 → 2ZrO2. When the oxygen concentration increases, the reaction rate between the zirconia particle surface and oxygen increases, generating more ZrO2. Due to the high electrical conductivity of ZrO2, the particle resistance decreases, and the conductivity increases. Therefore, the resistance of nano-zirconia particles decreases with increasing oxygen concentration, exhibiting a direct proportional relationship. Conversely, when the oxygen concentration decreases, the reaction rate between the zirconia particle surface and oxygen slows down, generating less ZrO2. Due to the high electrical conductivity of ZrO2, the particle resistance increases, and the conductivity decreases. Therefore, the resistance of nano-zirconia particles increases with decreasing oxygen concentration, exhibiting an inverse proportional relationship.

[0065] Specifically, (1) a zirconia precursor (such as zirconium chloride ZrCl4) is dissolved in a solvent (such as water) by stirring or heating to obtain a zirconia precursor solution. The purpose of dissolution is to convert the zirconia precursor into reactive ions or complexes so that zirconia particles can be formed in subsequent steps.

[0066] The ratio of zirconium oxide precursor solution to water can be adjusted according to the required concentration and size of nano-zirconia particles.

[0067] (2) Add a surfactant (such as sodium dodecyl sulfate SDS or polyvinylpyrrolidone PVP) to the zirconium oxide precursor solution. The surfactant helps stabilize the dispersion system and prevent particle aggregation and precipitation.

[0068] (3) The zirconium oxide precursor solution with added surfactant is slowly added dropwise to water and stirred. During the reaction, an alkaline environment is formed, which promotes the generation of nano-zirconia particles.

[0069] (4) The nano-zirconia particles are washed. Specifically, the nano-zirconia particles are washed with an appropriate amount of anhydrous ethanol to remove unreacted precursor substances and other residual impurities. The washing is repeated to effectively purify the particles.

[0070] (5) Disperse and dissolve the washed nano-zirconia particles in a solvent (such as water) to obtain a nano-zirconia particle solution. By dispersing and dissolving, the nanoparticles can be uniformly distributed in the solution, which facilitates subsequent applications.

[0071] The stirring speed during the preparation of the nano-silica particle solution is adjusted according to the solution viscosity and reaction rate. The size of the nano-zirconia particles is controlled by adjusting the dropping rate of the zirconia precursor solution. The reaction temperature is generally at room temperature, but heating or cooling can be performed as needed. The reaction time is adjusted according to the reaction rate and the desired size of the nano-zirconia particles.

[0072] S14: The nano silver particle solution, the nano silica particle solution, and the nano zirconium oxide particle solution are mixed and dispersed in a solvent to obtain a nanomaterial solution.

[0073] Specifically, the nano-silver particle solution, nano-silica particle solution, and nano-zirconia particle solution are mixed and dispersed in an appropriate amount of solvent in a 1:1 ratio, and then uniformly dispersed by stirring or ultrasonic treatment.

[0074] S2: The nanomaterial solution is coated onto the inner surface of the packaging substrate.

[0075] Specifically, the surface of the packaging substrate (such as paper) is first treated with surfactants or plasma treatment methods to improve the coating effect and adhesion. Then, the nanomaterial solution is uniformly coated onto the inner surface of the packaging substrate using an offset printing machine or coating machine. The coating speed, coating thickness, and coating uniformity are recorded based on actual operation and measurement. The coating thickness is controlled between 10 and 20 micrometers, and infrared drying is used for drying.

[0076] S3: Print the trademark design pattern on the outer surface of the packaging substrate coated with nanomaterial solution, and then perform die cutting.

[0077] Specifically, choose UV offset printing and avoid printing methods that may damage nanomaterials, such as those using high temperatures, high pressures, or chemical solvents. Avoid excessive printing pressure and speeds to reduce mechanical damage to nanomaterials. Use UV-cured inks and avoid inks containing organic solvents to reduce chemical damage to nanomaterials.

[0078] S4: A chip is placed on the inner surface of a packaging substrate coated with a nanomaterial solution.

[0079] Specifically, firstly, the surfaces of the packaging substrate and the chip are cleaned with detergent and purified water to ensure they are clean and free of dust, oil, or other impurities. Then, a conductive adhesive is applied to the contact area between the chip and the packaging substrate, which is coated with a nanomaterial solution. This conductive adhesive, being conductive, establishes an electrical connection between the chip and the packaging substrate. Next, the chip is gently adhered to the packaging substrate coated with the conductive adhesive, ensuring full contact between the chip and the substrate surface, and that the conductive adhesive covers the chip's pins or circuit connection areas. Appropriate pressure is then applied to press the chip and packaging substrate together to ensure good contact and connection; this can be done using equipment such as a hot press or a pressing machine. Finally, the conductive adhesive is cured according to its requirements, using methods such as baking or ultraviolet irradiation. After the connection is complete, the connection is tested and adjusted to ensure its reliability and performance meet requirements. Testing instruments and methods can be used to verify the electrical connection and conductivity.

[0080] S5: The electrical signal of the nanomaterial solution is detected by the chip, and the temperature, humidity, and oxygen concentration inside the packaging substrate are determined based on the electrical signal. The temperature, humidity, and oxygen concentration inside the packaging substrate are then uploaded to the cloud for storage. The electrical signal of the nanomaterial solution includes the resistance of the nano-silver particle solution, the capacitance of the nano-silica particle solution, and the resistance of the nano-zirconia particle solution.

[0081] The chip, acting as a sensor, can read electrical signals and process data. It reads electrical signals through its interface, decodes them using a dedicated chip, converts them into temperature, humidity, and oxygen concentration data, and wirelessly uploads these data to the cloud for storage and analysis. Specifically, environmental parameters inside the packaging can be monitored in real time via a mobile application or other terminal devices.

[0082] The cloud can analyze and process received temperature, humidity, and oxygen concentration data to achieve intelligent control and management of the internal environment of the packaging, including monitoring, alarming, and adjusting parameters such as temperature, humidity, and oxygen concentration. For example, it can issue alarms when the temperature exceeds a set range or the humidity change exceeds a threshold, and regularly generate reports and statistical data to help take timely measures to prevent product quality problems and losses (such as preservation and quality control of temperature-sensitive products such as food and pharmaceuticals).

[0083] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A smart packaging based on nanotechnology, characterized in that, The smart packaging based on nanotechnology includes a packaging substrate, a nanomaterial solution, and a chip; The nanomaterial solution is coated on the inner surface of the packaging substrate; the nanomaterial solution includes nano silver particle solution, nano silica particle solution and nano zirconium oxide particle solution; The chip is disposed on the inner surface of the packaging substrate and is in contact with the nanomaterial solution. The chip is used to detect the electrical signal of the nanomaterial solution and determine the temperature, humidity and oxygen concentration inside the packaging substrate based on the electrical signal, and upload the temperature, humidity and oxygen concentration inside the packaging substrate to the cloud for storage. The electrical signal of the nanomaterial solution includes the resistance of the nano silver particle solution, the capacitance of the nano silica particle solution and the resistance of the nano zirconium oxide particle solution.

2. A method for preparing smart packaging based on nanotechnology, used to prepare the smart packaging based on nanotechnology as described in claim 1, characterized in that, The method for preparing the nanotechnology-based smart packaging includes: Preparation of nanomaterial solutions; the nanomaterial solutions include solutions of silver nanoparticles, silica nanoparticles, and zirconium nanoparticles. The nanomaterial solution is coated onto the inner surface of the packaging substrate; Chips are placed on the inner surface of a packaging substrate coated with a nanomaterial solution; The electrical signals of the nanomaterial solution are detected by the chip, and the temperature, humidity and oxygen concentration inside the packaging substrate are determined based on the electrical signals. The temperature, humidity and oxygen concentration inside the packaging substrate are then uploaded to the cloud for storage. The electrical signals of the nanomaterial solution include the resistance of the nano silver particle solution, the capacitance of the nano silica particle solution and the resistance of the nano zirconium oxide particle solution.

3. The method for preparing smart packaging based on nanotechnology according to claim 2, characterized in that, The preparation of nanomaterial solutions specifically includes: A solution of silver nanoparticles was prepared by chemical reduction. A solution of nano-silica particles was prepared by hydrolysis reaction; A solution of nano-zirconia particles was prepared by hydrolysis reaction; The nano-silver particle solution, the nano-silica particle solution, and the nano-zirconia particle solution are mixed and dispersed in a solvent to obtain a nanomaterial solution.

4. The method for preparing smart packaging based on nanotechnology according to claim 3, characterized in that, The preparation of nano-silver particle solutions using a chemical reduction method specifically includes: The silver salt is dissolved in a solvent to dilute and dissolve the silver salt, thus obtaining a silver salt solution; The reducing agent is dissolved in a solvent to obtain a reducing agent solution; The silver salt solution and the reducing agent solution are mixed evenly, so that the reducing agent in the reducing agent solution reacts chemically with the silver ions in the silver salt solution, reducing the silver ions into nano-sized silver particles, thus obtaining a nano-silver particle solution.

5. The method for preparing smart packaging based on nanotechnology according to claim 3, characterized in that, The preparation of nano-silica particle solutions via hydrolysis reaction specifically includes: The silica precursor is dissolved in a solvent to obtain a silica precursor solution; The silica precursor solution was added dropwise to water and stirred to cause a hydrolysis reaction in the silica precursor solution. After the hydrolysis reaction was completed, nano-silica particles were obtained. The nano-silica particles are washed; The washed nano-silica particles are dispersed and dissolved in a solvent to obtain a nano-silica particle solution.

6. The method for preparing smart packaging based on nanotechnology according to claim 3, characterized in that, The preparation of nano-zirconia particle solutions via hydrolysis reaction specifically includes: The zirconia precursor was dissolved in a solvent to obtain a zirconia precursor solution; A surfactant is added to the zirconium oxide precursor solution; The zirconium oxide precursor solution with added surfactant was added dropwise to water and stirred to generate nano-zirconia particles; The nano-zirconia particles are washed; The washed nano-zirconia particles were dispersed and dissolved in a solvent to obtain a nano-zirconia particle solution.

7. The method for preparing smart packaging based on nanotechnology according to any one of claims 3 to 6, characterized in that, The solvent is water or ethanol.

8. The method for preparing smart packaging based on nanotechnology according to claim 2, characterized in that, Prior to the step of setting the chip on the inner surface of the packaging substrate coated with a nanomaterial solution, the method for preparing the nanotechnology-based smart packaging further includes: The trademark design pattern is printed on the outer surface of the packaging substrate coated with a nanomaterial solution, and then die-cut.

9. The method for preparing smart packaging based on nanotechnology according to claim 2, characterized in that, A chip is disposed on the inner surface of a packaging substrate coated with a nanomaterial solution, specifically including: A conductive adhesive is applied to the contact area between the packaging substrate coated with a nanomaterial solution and the chip, and the chip is then attached to the contact area and pressed together with the packaging substrate.

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