Large-scale preparation method of metal quantum fragments

Abstract

The invention relates to a large-scale preparation method of metal quantum fragments, which is characterized in that Sn, Ag, Cu and Au powder is used for ultrasonic treatment, and due to ultrahigh pressure collision among metals, the quantum fragments are obtained. The preparation process is simple, and the diameter of the prepared metal quantum fragments can reach 2 nm or below. The production of a large batch of metal quantum fragments provides a breakthrough for the fields of photoelectric detectors, solar cells, quantum science and technology and the like.

Description

Technical Field

[0001] The present invention relates to a method for large-scale preparation of metal quantum fragments, belonging to the technical field of metal material preparation. Background Art

[0002] Metals are an important component of matter. The material of metals is relatively stable. There is still a lack of top-down exploration of the preparation of metal quantum materials. The existing preparation methods for structures such as metal quantum dots are often complex. In addition, quantum effects mainly consider that at low-dimensional scales, atomic substances exhibit quantum properties different from macroscopic substances. From this perspective, quantum dots, quantum flakes, quantum wires, and atomic clusters with irregular shapes can all be collectively referred to as quantum fragments. The present invention uses ultrasonic waves to achieve mutual impact between metal particles, thereby obtaining metal quantum fragments. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for large-scale preparation of metal quantum fragments in view of the blank of the existing technology.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A method for large-scale preparation of metal quantum fragments includes the following steps:

[0006] Put metal powder into a solution;

[0007] Perform ultrasonic treatment;

[0008] Let the obtained solution stand still to obtain the upper-layer solution; that is, obtain the metal quantum fragment solution.

[0009] In the above technical solution, further, the metal material is one or more of Sn, Ag, Cu, and Au.

[0010] Further, the solution is one or more of oleic acid, toluene, NMP, IPA, DMF, acetone, alcohol, and water.

[0011] Further, the frequency of the ultrasonic wave is not less than 10 KHz, the power is not less than 100 W, and the ultrasonic time is from 10 seconds to 10,000 hours.

[0012] The beneficial effects of the present invention compared with the existing technology are as follows:

[0013] The preparation process of the present invention is simple. The obtained quantum fragments can reach 1 nm, and different kinds of metals can be prepared. These quantum fragments have good luminescence properties. The birth of the quantum fragments will provide new development paths for the fields of photodetectors, solar cells, integrated circuits, and quantum communication technologies. Brief Description of the Drawings

[0014] Figure 1 It is an optical picture of the tin quantum fragment solution obtained in Example 1;

[0015] Figure 2a and 2b , 2c is the electron microscope picture of the copper quantum fragment obtained in Example 2;

[0016] Figure 3a and 3b is the transmission electron microscope picture of the silver quantum fragment of Example 3.

[0017] Figure 4 is the optical picture of the solution of the gold quantum fragment of Example 4. Detailed implementation manners

[0018] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] The present invention can realize the batch preparation of metal quantum fragments by using a simple method of ultrasonic treatment in solution. The method is simple and suitable for large-scale production.

[0020] The preparation method of the metal quantum fragments of the present invention includes the following steps:

[0021] 1) Obtain metal powders such as tin, copper, silver, gold, etc.;

[0022] 2) Put the selected metal powder into solutions such as oleic acid, toluene, NMP, IPA, DMF, acetone, alcohol, water, etc., or a mixed solution of any multiple of them to form a mixed solution, and perform ultrasonic treatment; under the action of ultrasonic waves, violent collisions occur between metal powder particles, thereby generating a huge pressure (up to dozens of GPa) impact between extremely small contact surfaces, so that some chemical bonds of the powder particles are broken, and quantum fragments are formed during the continuous collision and splitting process.

[0023] 3) Let the reactants stand for precipitation;

[0024] 4) Take the upper solution, and a liquid containing a large number of metal quantum fragments is obtained.

[0025] In the method of the present invention, the dosage of the metal powder and the solution is usually not less than 0.01 mg / mL.

[0026] The ultrasonic wave used usually has a frequency of not less than 10 KHz and a power of not less than 100 W. The ultrasonic treatment time can be long or short, and can be from 10 seconds to 10,000 hours. When the ultrasonic frequency and power are high enough, the ultrasonic time can be shorter, and it can even be completed in a few seconds; this method does not require controlling the reaction temperature and can be prepared at normal temperature or high temperature.

[0027] The metal material powders and solutions used in the present invention can be directly purchased.

[0028] Example 1:

[0029] 1) Add 50 g of tin crystal powder to 250 mL of acetone solution;

[0030] 2) Place it in an ultrasonic machine and ultrasonicate for half an hour at a power of 500 watts and a frequency of 50 KHz;

[0031] 3) Let it precipitate for 30 minutes, and pour the upper non-precipitate into a clean bottle;

[0032] Figure 1 This is the optical picture of the quantum fragment solution obtained in this example, and it can be seen that there is a large amount of suspension.

[0033] Example 2:

[0034] 1) Add 20 g of copper crystal powder to 500 mL of acetone solution;

[0035] 2) Place it in an ultrasonic machine and ultrasonicate for half an hour at a power of 1 kilowatt and a frequency of 20 KHz;

[0036] 3) Let it precipitate for 10 minutes, and pour the upper non-precipitate into a clean bottle;

[0037] Figure 2a This is the STEM image of the quantum fragment obtained in this example, Figure 2b This is the TEM image of the quantum fragment obtained in this example. It can be seen that a large number of quantum fragments with a diameter of around 1 nanometer are generated, and quantum dots with a diameter of around 3 nanometers are also found.

[0038] Example 3:

[0039] 1) Add 20 g of crystal silver powder to 200 mL of acetone solution;

[0040] 2) Place it in an ultrasonic machine and ultrasonicate for half an hour at a power of 1 kilowatt and a frequency of 20 KHz;

[0041] 3) Let it precipitate for 20 minutes, and pour the upper non-precipitate into a clean bottle;

[0042] Figure 3a 、 3b This is the TEM image of the quantum fragment obtained in this example. It can be seen that most of them have formed the shape of quantum dots with a diameter of around 2 nanometers.

[0043] Example 4:

[0044] 1) Add 2 g of crystal Au powder to 15 mL of NMP solution;

[0045] 2) Place it in an ultrasonic machine and ultrasonicate for half an hour at a power of 1 kilowatt and a frequency of 20 KHz;

[0046] 3) Let it precipitate for 10 minutes and pour the upper non-precipitate into a clean bottle;

[0047] Figure 4 It is an optical picture of the solution obtained in this example.

[0048] The embodiments described above are only partial implementation solutions of the present invention, but they are not intended to limit the present invention. Those of ordinary skill in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all technical solutions obtained by adopting the means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A method for large-scale preparation of metal quantum fragments, characterized in that, It includes the following: Put the metal powder into the solution; Perform ultrasonic treatment; Let the obtained solution stand still to obtain the upper-layer solution; that is, obtain the metal quantum fragment solution.

2. The large-scale preparation method of the metal quantum fragment according to claim 1, wherein The metal material is one or more of Sn, Ag, Cu, and Au.

3. The large-scale preparation method of the metal quantum fragment according to claim 1, characterized in that, The solution is one or more of oleic acid, toluene, NMP, IPA, DMF, acetone, alcohol, and water.

4. The large-scale preparation method of the metal quantum fragment according to claim 1, characterized in that, The frequency of the ultrasonic wave is not less than 10 KHz, and the power is not less than 100 W.

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