Device and method for preparing platinum nanoparticles based on plasma jet

Abstract

The invention discloses a device and a method for preparing platinum nanoparticles based on plasma jet, and relates to the technical field of preparation of gold nanoparticles. The device comprises a DBD plasma jet device used for generating plasma jet, a power supply system used for providing high frequency and high voltage for a metal rod electrode, a gas inlet system used for providing a gas environment for the device, a quartz reactor used for providing an environment for preparing platinum nanoparticles, and a precursor solution used for generating the platinum nanoparticles, and the precursor solution and the plasma jet are introduced into the quartz reactor through the jet extraction quartz tube to be subjected to a reduction reaction, and platinum nanoparticles are generated. By means of the plasma jet technology, the method has the advantages that the reaction process is rapid and can be completed within a few minutes, the production efficiency is remarkably improved, the method is suitable for large-scale production, and the prepared platinum nanoparticles have good dispersity and stability and can be directly applied to various application fields without additional stabilization treatment.

Description

Technical Field

[0001] The present invention belongs to the technical field of preparing nano-gold particles, and in particular relates to a device for preparing platinum nano-particles based on a plasma jet under atmospheric pressure, and a method for preparing platinum nano-particles based on a plasma jet under atmospheric pressure. Background Art

[0002] Platinum nanoparticles have excellent antioxidant properties, good conductivity and high specific surface area, and are widely used in related fields such as biomedicine, optoelectronic devices and catalytic materials. Existing preparation methods include chemical reduction, hydrothermal method, sol-gel method, etc.

[0003] Plasma jet refers to a material flow phenomenon in which molecules or atoms in a gas are excited or ionized to form plasma through electromagnetic fields or shock waves, and then the plasma is ejected through an accelerator. Plasma jet has the characteristics of high temperature, high speed, high energy density, etc., and is a very active form of matter.

[0004] Platinum nanoparticles generally refer to suspensions or colloids of platinum particles with a size of 2-20nm dispersed in water. Platinum nanoparticles are made by reducing hexachloroplatinate. Due to its good antioxidant properties, platinum nanoparticles are the main research object for a wide range of potential applications, including: nanotechnology, medicine and the synthesis of new materials with unique properties.

[0005] Controlling the size and distribution of platinum nanoparticles is one of the ways to regulate the performance of platinum nanoparticles. In the common preparation method of platinum nanoparticles, platinum-containing halides are usually used as precursors, and a reducing agent (such as sodium borohydride, aldehydes, alcohols, hydrazine, etc.) is added to react under heating conditions for several hours. Generally, a stabilizer is added to inhibit the aggregation of nanoparticles. The stabilizer has a strong interaction with the platinum nanoparticles, which will affect the relevant functionality of the platinum nanoparticles.

[0006] Patent CN1215639A discloses a method for preparing nano-metal clusters. This method requires the addition of stabilizer PVP and auxiliary stabilizer long-chain amines or water-soluble phosphines, and reacts under high pressure and low temperature conditions to obtain precious metal nanoclusters such as platinum, rhodium, and palladium with a size of less than 2nm.

[0007] Patent CN108971516A discloses a platinum nanoparticle and a preparation method thereof. The method uses potassium chloroplatinate as a precursor, adds a surfactant tetra-n-octylammonium bromide and toluene, and the reaction solution needs to be heated in H 2 The reaction is carried out for 48 to 96 hours. Although the reaction conditions are mild, the reaction time is long.

[0008] Therefore, in the preparation process of platinum nanoparticles in the above-mentioned disclosed technology, it is necessary to control the use of stabilizers as much as possible and obtain platinum nanoparticles with a narrow size range. Summary of the invention

[0009] The object of the present invention is to provide a device and method for preparing platinum nanoparticles based on plasma jet. The platinum nanoparticles prepared by a DBD plasma jet device that generates a plasma jet have good dispersibility and stability and can be directly applied to various application fields without additional stabilization treatment.

[0010] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The invention discloses a device for preparing platinum nanoparticles based on plasma jet, comprising a DBD plasma jet device for generating plasma jet, comprising a metal rod electrode and a discharge cavity, wherein the discharge cavity is further provided with a quartz dielectric tube, an air intake pipeline and a jet outlet quartz tube, wherein the metal rod electrode is located in the quartz dielectric tube; a power supply system for providing high frequency and high voltage to the metal rod electrode; an air intake system for providing a gas environment for the device, wherein the air intake system provides working gas to the discharge cavity through the air intake pipeline; a quartz reactor for providing an environment for preparing platinum nanoparticles, wherein the quartz reactor further comprises a quartz dielectric end tube, wherein an exhaust pipe port is further provided on the quartz dielectric end tube; the discharge cavity passes through the quartz dielectric end tube and is connected with the quartz reactor through the jet outlet quartz tube; a precursor solution for generating platinum nanoparticles; wherein the precursor solution and the plasma jet generated by the DBD plasma jet device are introduced into the quartz reactor through the jet outlet quartz tube to undergo a reduction reaction, thereby generating platinum nanoparticles.

[0011] Furthermore, the power supply system adopts a high-frequency high-voltage power supply or a nanosecond fast pulse repetitive frequency power supply, and the power supply system includes a high-voltage power supply and a power supply adapter.

[0012] Furthermore, the DBD plasma jet device is a single-electrode structure. The working gas is collided and ionized under the high voltage of the metal rod electrode to form ions and electrons, and trigger an electron avalanche. The electrons gather at the head of the avalanche, and the positive ions are concentrated at the tail, generating a self-inductance electric field, forming a positive streamer, breaking through the gas gap, and generating plasma. The plasma is generated near the high-voltage electrode, develops in the discharge cavity, and is led out through the jet lead-out quartz tube.

[0013] Furthermore, the DBD plasma jet device also includes a temperature control system, and the temperature control system includes a temperature sensor arranged in the discharge cavity to collect temperature data.

[0014] Furthermore, the working gas includes an inert gas, or H2 Mix with inert gas.

[0015] Furthermore, each of the working gases in the air intake system includes a gas flow controller.

[0016] Furthermore, the precursor solution is a Pt (IV) ion solution.

[0017] Furthermore, the quartz reactor also includes a cooling system, which includes an oil cooler or a water cooler. A sealed shell structure is arranged outside the quartz reactor, and the shell structure and the quartz reactor form a cavity structure. A liquid inlet and a liquid outlet are arranged on the shell structure to connect with the oil cooler or the water cooler for cooling.

[0018] The present invention is a method for preparing platinum nanoparticles based on plasma jet, comprising the following steps: SS01 prepares a precursor solution containing platinum ions, wherein the precursor solution comprises an aqueous solution or an organic solvent solution of chloroplatinic acid or a platinate or other soluble platinum salt; SS02 places the precursor solution in the quartz reactor of the DBD plasma jet device; SS03 applies high-frequency and high-voltage AC voltage to the metal rod electrode of the DBD plasma jet device through the power supply system. The working gas collides and ionizes under the high voltage of the metal rod electrode to generate plasma. The plasma is generated near the high-voltage electrode and develops in the discharge cavity to form a plasma jet. The plasma jet is led out through the jet lead-out quartz tube and introduced into the precursor solution, so that the platinum ions are reduced to platinum nanoparticles in the liquid environment. SS04 regulates the size and distribution of platinum nanoparticles by adjusting the parameters of plasma discharge, including discharge power, frequency, gas flow rate and reaction time; SS05 collects and separates the reacted platinum nanoparticles to obtain pure platinum nanoparticles.

[0019] Furthermore, the SS04 adjusts the parameters of the plasma discharge including First, introduce the inert Ar gas in the working gas at a rate of 3 L min -1 Keep it for more than 10 minutes to fully replace the air in the container and solution; then introduce 20 sccm of H 2 The output voltage of the high-frequency high-voltage power supply is 7kV. The plasma jet generated by the discharge is introduced into the precursor solution to be treated in the quartz reactor through the jet outlet quartz tube; the treatment lasts for 3min-5min.

[0020] The platinum nanoparticles prepared by the present invention can be widely used in the following fields: 1) Catalyst: Since platinum nanoparticles have excellent catalytic properties, they can be used for automobile exhaust purification, catalytic reactions in chemical processes, and electrode materials for fuel cells.

[0021] 2) Biomedicine: Platinum nanoparticles can be used in drug delivery systems, biosensors and cancer treatment due to their good biocompatibility and catalytic activity.

[0022] 3) Optoelectronic devices: Platinum nanoparticles can be used to manufacture high-performance photodetectors, solar cells and organic light-emitting diodes (OLEDs).

[0023] 4) Electronic materials: In the semiconductor industry, platinum nanoparticles can be used to make conductive pastes, electrode materials and nano-printed circuit boards.

[0024] The present invention has the following beneficial effects: (1) The plasma jet-based method for preparing platinum nanoparticles does not require the use of chemical reducing agents and surfactants, thereby reducing environmental pollution and potential toxicity problems and complying with the principles of green chemistry.

[0025] (2) The present invention is based on plasma jet technology and has a rapid reaction process that can be completed within a few minutes, significantly improving production efficiency.

[0026] (3) The present invention can achieve precise regulation of the particle size of platinum nanoparticles by precisely controlling the plasma discharge parameters, thereby obtaining nanoparticles with specific properties.

[0027] (4) The method for preparing platinum nanoparticles of the present invention is suitable for large-scale production because the plasma reactor can be designed into different scales to meet the needs of industrial production.

[0028] (5) The platinum nanoparticles prepared by the present invention have good dispersibility and stability and can be directly applied to various application fields without additional stabilization treatment.

[0029] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0031] Figure 1 A schematic diagram of a device for preparing platinum nanoparticles based on plasma jet according to the present invention; Figure 2 is a transmission electron microscope photograph of platinum nanoparticles prepared in Example 1; Figure 3 is a particle size distribution diagram of platinum nanoparticles prepared in Example 1; Figure 4 This is a high-resolution transmission electron microscope photograph of platinum nanoparticles prepared in Example 1; Figure 5 is the X-ray diffraction pattern of the platinum nanoparticles prepared in Example 1; Figure 6 is a transmission electron microscope photograph of platinum nanoparticles prepared in Example 2; Figure 7 This is a high-resolution transmission electron microscope photograph of platinum nanoparticles prepared in Example 2; Figure 8 This is the particle size distribution diagram of the platinum nanoparticles prepared in Example 2. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] First of all, in terms of definition, DBD, or dielectric barrier discharge, refers to a form of non-equilibrium gas discharge after an insulating dielectric material is inserted between metal electrodes. Dielectric barrier discharge is a gas discharge in which an insulating dielectric is inserted into the discharge space. The dielectric can cover the electrode or be suspended in the discharge space. In this way, when a sufficiently high AC voltage is applied to the discharge electrode, the gas between the electrodes will be broken down even at a very high gas pressure to form the so-called dielectric barrier discharge.

[0034] At atmospheric pressure (10 5 Pa), this gas discharge presents a microchannel discharge structure, that is, the current passing through the discharge gap is composed of a large number of fast pulse current filaments. The current filaments are irregularly distributed in the discharge space and time. This current filament is also called microdischarge. The time process of each microdischarge is very short, with a lifetime of less than 10ns, but the current density is very high. On the surface of the medium, the microdischarge spreads into surface discharge, which presents bright spots, and the largest can reach several millimeters.

[0035] like Figure 1As shown, the present invention is a device for preparing platinum nanoparticles based on plasma jet, including a DBD plasma jet device for generating a plasma jet 8, including a metal rod electrode 5 and a discharge cavity 2, the discharge cavity 2 is also provided with a quartz dielectric tube 201, an air inlet pipeline 202 and a jet outlet quartz tube 7, the metal rod electrode 5 is located in the quartz dielectric tube 201; the DBD plasma jet device is a single electrode structure, the working gas is collided and ionized under the high pressure of the metal rod electrode 5 to form ions and electrons, and induce an electron avalanche, the electrons gather at the head of the avalanche, the positive ions are concentrated at the tail, a self-inductance electric field is generated, a positive streamer is formed, the gas gap is broken down, and plasma is generated, the plasma is generated near the high-voltage electrode, develops in the discharge cavity 2, and is led out through the jet outlet quartz tube 7.

[0036] A power supply system for providing high frequency and high voltage to the metal rod electrode 5; the power supply system adopts a high frequency and high voltage power supply 1 or a nanosecond fast pulse repetitive frequency power supply. The power supply system includes a high voltage power supply and a power supply adapter. The power supply adapter is used to adjust the frequency and amplitude of the AC voltage applied to both ends of the high voltage electrode. By adjusting the voltage parameters, the plasma generation conditions can be controlled, thereby affecting the synthesis process of platinum nanoparticles and the characteristics of the final product.

[0037] An air intake system 4 for providing a gas environment for the device, the air intake system 4 provides working gas to the discharge cavity 2 through an air intake pipeline 202; A quartz reactor 3 for providing an environment for preparing platinum nanoparticles, wherein the quartz reactor 3 further comprises a quartz dielectric end tube 6, on which an exhaust pipe port 601 is also provided; the discharge cavity 2 passes through the quartz dielectric end tube 6 and is connected to the quartz reactor 3 through a jet outlet quartz tube 7; A precursor solution 9 for producing platinum nanoparticles; the precursor solution 9 and the plasma jet 8 produced by the DBD plasma jet device are introduced into the quartz reactor 3 through the jet outlet quartz tube 7 to undergo a reduction reaction to produce platinum nanoparticles.

[0038] The single-electrode dielectric barrier discharge plasma reaction device of this embodiment includes a DBD plasma jet generator, an air intake system 4, a quartz reactor 3, a high-voltage power supply and a power adapter, and the high-frequency high-voltage power supply 1 is composed of the high-voltage power supply and the power adapter, and the high-frequency high-voltage power supply 1 is grounded. Among them, the DBD plasma jet generator is composed of a metal rod electrode 8 with an outer diameter of 15mm, a quartz dielectric end tube 6 with an inner diameter of 2mm, a discharge cavity 2, an air intake pipeline 202, and a jet outlet quartz tube 7, and the jet outlet quartz tube 7 has an inner diameter of 3mm and a length of 100mm; the model of the high-frequency high-voltage power supply 1 is TP-2000K, the output current range is 0-30kV, and the output frequency range is 20-70kHz.

[0039] The DBD plasma jet generator in this embodiment is a single-electrode structure. The metal rod electrode 5 is inserted into the quartz dielectric tube 201. The external high-frequency high-voltage power supply 1 becomes a high-voltage electrode. The gas enters from the air inlet pipe 202 of the discharge cavity 2. When the high-voltage electrode is applied with high voltage, the discharge gas in the discharge cavity 2 is broken down to generate plasma. The plasma is generated near the high-voltage electrode, develops in the discharge cavity 2, and is led out through the jet lead-out quartz tube 7 to form a plasma jet 8.

[0040] Plasma is generated by applying an AC voltage to both ends of the high-voltage electrode. As the voltage increases and reaches the breakdown voltage of the gas, the gas undergoes collision ionization, generating ions and electrons, and the first electron avalanche appears, generating a large amount of space charge. Electrons gather at the spherical head of the avalanche, and positive ions concentrate at the tail of the avalanche, generating a self-inductive electric field. This self-inductive electric field moves rapidly in the opposite direction of the high-voltage electrode, forming a positive streamer, forming a conductive channel in the discharge gap, and thus breaking through the gas gap. If the applied voltage exceeds the critical breakdown voltage and there is a strong electric field in the gap, the electron avalanche ionization is enhanced, and a distorted electric field is formed near the high-voltage electrode, which generates photoelectrons and electron avalanches, increases the conductivity of the discharge channel, forms a negative streamer moving toward the anode, or breaks through the gap, or returns from the direction of the high-voltage electrode to form a stronger electric field wave, forms a conductive channel, and quickly breaks through the gas in the discharge gap. After that, the space charge on the medium continues to gather, forming a new electric field in the opposite direction, continuously reducing the effect of the external electric field until there is no discharge current, at which time the discharge is terminated.

[0041] The discharge occurs in the discharge cavity 2 outside the dielectric. The presence of the dielectric can prevent the formation of sparks and arcs during the discharge process. The airflow can take some of the charged particles out of the discharge cavity 2, reducing the number of charged particles inside the cavity, which can have a certain inhibitory effect on electron collapse and avoid the formation of filamentary discharge. The plasma jet has highly active substances such as high-energy particles and ultraviolet rays. It is led out through the jet lead-out quartz tube 7 to divide the discharge area and the working area. By adding working gases of different properties, active plasmas of different properties can be obtained. The plasma jet with active substances and charged particles is led out to prepare or modify materials.

[0042] The working gas includes an inert gas or H 2 Mixed gas with inert gas. Each working gas in the intake system 4 includes a gas flow controller. Each working gas in the intake system 4 includes a gas flow controller, which controls the H 2 When one of the gas flow controllers is turned on, it means that the gas is controlled to enter the discharge chamber 2. If both gas flow controllers are turned on, it means that the mixed working gas enters the discharge chamber 2.

[0043] The gas flow controller is used to accurately control the flow of the working gas to ensure the stability and uniformity of the plasma jet, thereby ensuring the uniform size distribution of the platinum nanoparticles.

[0044] It is used to mix the precursor solution 9 with the working gas to ensure that the precursor solution can be evenly contacted with the plasma under the action of the plasma jet, thereby improving the uniformity and dispersibility of the platinum nanoparticles.

[0045] Among them, the DBD plasma jet device also includes a temperature control system, which includes a temperature sensor arranged in the discharge cavity 2 to collect temperature data, which is used to control the temperature in the discharge cavity to optimize the generation of plasma and the reduction reaction of the precursor solution, thereby improving the yield and quality of platinum nanoparticles.

[0046] The quartz reactor 3 also includes a cooling system, which includes an oil cooler or a water cooler. A sealed shell structure is arranged outside the quartz reactor 3, and the shell structure and the quartz reactor 3 form a cavity structure. A liquid inlet and a liquid outlet are arranged on the shell structure to connect with the oil cooler or the water cooler for cooling.

[0047] The cooling system is used to cool the reactor during the preparation process to prevent the internal temperature of the reactor from being too high, which may cause the agglomeration or uncontrolled growth of the platinum nanoparticles, thereby ensuring the stability of the particle size and morphology of the platinum nanoparticles.

[0048] The quartz reactor 3 has an adjustable reaction zone length. By adjusting the reaction zone length, the residence time of the platinum nanoparticles in the reactor can be controlled, thereby adjusting the growth process of the platinum nanoparticles and achieving precise control of the particle size and morphology of the platinum nanoparticles.

[0049] The present invention is a method for preparing platinum nanoparticles based on plasma jet, comprising the following steps: SS01 is provided with a precursor solution 9 containing platinum ions, wherein the precursor solution 9 includes an aqueous solution or an organic solvent solution of chloroplatinic acid or a platinate or other soluble platinum salt; SS02 places the precursor solution 9 in the quartz reactor 3 of the DBD plasma jet device; SS03 applies a high-frequency and high-voltage AC voltage to the metal rod electrode 5 of the DBD plasma jet device through the power supply system, and the working gas collides and ionizes under the high voltage of the metal rod electrode 5 to generate plasma. The plasma is generated near the high-voltage electrode and develops in the discharge cavity 2 to form a plasma jet 8. The plasma jet 8 is led out through the jet lead-out quartz tube 7 and introduced into the precursor solution 9, so that the platinum ions are reduced into platinum nanoparticles in the liquid environment; SS04 regulates the size and distribution of platinum nanoparticles by adjusting the parameters of plasma discharge, including discharge power, frequency, gas flow rate and reaction time; SS05 collects and separates the platinum nanoparticles after the reaction to obtain pure platinum nanoparticles. The platinum nanoparticles after the reaction are collected and separated. Centrifugation, dialysis and other methods can be used for separation to obtain pure platinum nanoparticles. Example

[0050] The output voltage range of DBD plasma jet generator high frequency high voltage power supply 1 is 0~30kV, and the output frequency range is 20~70kHz.

[0051] like Figure 2-5 As shown, take 60 mL of the prepared Pt (IV) ion solution (0.04 g·L -1 ) were placed in the APPJ reactor and introduced with Ar gas (3 L min -1 ) for more than 10 min to fully replace the air in the container and solution, and then introduce 20 sccm of H 2 (sccm, the full name is standard cubic centimeter per minute, which is a unit of volume flow), and the output voltage of the high-frequency high-voltage power supply 1 is set to 7 kV. The plasma jet 8 generated by the discharge is introduced into the precursor solution 9 to be treated in the quartz reactor 3 through the jet outlet quartz tube 7 for 3 minutes. Example

[0052] like Figure 6-8 As shown, take 60 mL of the prepared Pt (IV) ion solution (0.04 g·L -1 ) were placed in the APPJ reactor and introduced with Ar gas (3 L min -1 ) for more than 10 min to fully replace the air in the container and solution, and then introduce 20 sccm of H 2 The output voltage of the high-frequency high-voltage power supply 1 is set to 7 kV, and the plasma jet 8 generated by the discharge is introduced into the precursor solution 9 to be treated in the quartz reactor 3 through the jet outlet quartz tube 7 for 5 minutes.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for preparing platinum nanoparticles based on plasma jet, characterized in that: include A DBD plasma jet device for generating a plasma jet (8), comprising a metal rod electrode (5) and a discharge cavity (2), wherein the discharge cavity (2) is further provided with a quartz dielectric tube (201), an air inlet pipeline (202) and a jet outlet quartz tube (7), and the metal rod electrode (5) is located in the quartz dielectric tube (201); A power supply system for providing high frequency and high voltage to the metal rod electrode (5); An air intake system (4) for providing a gas environment for the device, wherein the air intake system (4) provides working gas to the discharge cavity (2) via an air intake pipeline (202); A quartz reactor (3) for providing an environment for preparing platinum nanoparticles, the quartz reactor (3) further comprising a quartz dielectric end tube (6), the quartz dielectric end tube (6) further being provided with an exhaust pipe port (601); the discharge cavity (2) passes through the quartz dielectric end tube (6) and is connected to the quartz reactor (3) via the jet outlet quartz tube (7); A precursor solution (9) for producing platinum nanoparticles; the precursor solution (9) and a plasma jet (8) produced by a DBD plasma jet device are introduced into a quartz reactor (3) through a jet outlet quartz tube (7) to undergo a reduction reaction, thereby producing platinum nanoparticles.

2. The device for preparing platinum nanoparticles based on plasma jet according to claim 1, characterized in that: The power supply system adopts a high-frequency high-voltage power supply (1) or a nanosecond fast pulse repetitive frequency power supply, and the power supply system comprises a high-voltage power supply and a power supply adapter.

3. The device for preparing platinum nanoparticles based on plasma jet according to claim 1, characterized in that: The DBD plasma jet device is a single-electrode structure. The working gas is collided and ionized under high pressure at the metal rod electrode (5), forming ions and electrons, and triggering an electron avalanche. The electrons gather at the head of the avalanche, and the positive ions gather at the tail, generating a self-inductive electric field, forming a positive streamer, breaking through the gas gap, and generating plasma. The plasma is generated near the high-voltage electrode, develops in the discharge cavity (2), and is led out through the jet lead-out quartz tube (7).

4. The device for preparing platinum nanoparticles based on plasma jet according to claim 1 or 3, characterized in that: The DBD plasma jet device also includes a temperature control system, which includes a temperature sensor arranged in the discharge cavity (2) to collect temperature data.

5. The device for preparing platinum nanoparticles based on plasma jet according to claim 1, characterized in that: The working gas includes an inert gas, or a mixture of H2 and an inert gas.

6. The device for preparing platinum nanoparticles based on plasma jet according to claim 1, characterized in that: Each of the working gases in the air intake system (4) includes a gas flow controller.

7. The device for preparing platinum nanoparticles based on plasma jet according to claim 1, characterized in that: The precursor solution (9) is a Pt(IV) ion solution.

8. The device for preparing platinum nanoparticles based on plasma jet according to claim 1, characterized in that: The quartz reactor (3) further comprises a cooling system, wherein the cooling system comprises an oil cooler or a water cooler.

9. A method for preparing platinum nanoparticles based on plasma jet, characterized in that: The steps include: SS01 is provided with a precursor solution (9) containing platinum ions, wherein the precursor solution (9) comprises an aqueous solution or an organic solvent solution of chloroplatinic acid or a platinate or other soluble platinum salt; SS02 places the precursor solution (9) in a quartz reactor (3) of a DBD plasma jet device; SS03 applies a high-frequency and high-voltage alternating voltage to the metal rod electrode (5) of the DBD plasma jet device through a power supply system, and the working gas is collided and ionized under the high voltage of the metal rod electrode (5) to generate plasma. The plasma is generated near the high-voltage electrode and develops in the discharge chamber (2) to form a plasma jet (8). The plasma jet (8) is led out through a jet lead-out quartz tube (7) and introduced into a precursor solution (9), so that the platinum ions are reduced to platinum nanoparticles in a liquid environment; SS04 regulates the size and distribution of platinum nanoparticles by adjusting the parameters of plasma discharge, including discharge power, frequency, gas flow rate and reaction time; SS05 collects and separates the reacted platinum nanoparticles to obtain pure platinum nanoparticles.

10. The method for preparing platinum nanoparticles based on plasma jet according to claim 9, characterized in that: The SS04 adjusts the parameters of plasma discharge including First, introduce the inert Ar gas in the working gas at a rate of 3 L min -1 Keep it for more than 10 minutes to fully replace the air in the container and solution; Then, 20 sccm of H2 is introduced, the output voltage of the high-frequency high-voltage power supply (1) is 7 kV, and the plasma jet (8) generated by the discharge is introduced into the precursor solution (9) to be treated in the quartz reactor (3) through the jet outlet quartz tube (7); Process for 3min-5min.

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