CN111644634A - Method for preparing two-dimensional metal through hot pressing based on solution processing - Google Patents

Method for preparing two-dimensional metal through hot pressing based on solution processing Download PDF

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CN111644634A
CN111644634A CN202010313677.6A CN202010313677A CN111644634A CN 111644634 A CN111644634 A CN 111644634A CN 202010313677 A CN202010313677 A CN 202010313677A CN 111644634 A CN111644634 A CN 111644634A
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solution
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metal
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黄凯
雷鸣
张佳希
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/05—Metallic powder characterised by the size or surface area of the particles
    • B22F1/054—Nanosized particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/05—Metallic powder characterised by the size or surface area of the particles
    • B22F1/054—Nanosized particles
    • B22F1/0551—Flake form nanoparticles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/06—Metallic powder characterised by the shape of the particles
    • B22F1/068—Flake-like particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/02—Elements
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
    • C30B29/64—Flat crystals, e.g. plates, strips or discs
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
    • C30B7/14—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions the crystallising materials being formed by chemical reactions in the solution

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Metallurgy (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

The invention relates to a method for preparing two-dimensional metal by hot pressing based on solution processing, belonging to the field of material science, engineering technology and chemistry. The raw materials used by the method are metal precursor solution or metal powder particles, including silver nitrate solution, chloroauric acid solution, platinum nitrate solution, niobium metal powder particles and the like, and proper amount of ethanol is added to prepare dispersion liquid, and the dispersion liquid clamped between two silicon wafers is remolded into two-dimensional metal at certain temperature and under certain pressure. The invention has the advantages of simple preparation process, high efficiency, good performance, low cost and the like.

Description

Method for preparing two-dimensional metal through hot pressing based on solution processing
(2) Field of the invention
The invention relates to a method for preparing a two-dimensional material by hot pressing, belonging to the field of material science, engineering technology and chemistry.
(3) Background of the invention
Compared with bulk metal, the ultrathin metal material with the two-dimensional nanostructure can generally show unexpected physical and chemical properties, and can be used for developing brilliance in the industrial fields of superconduction, magnetic storage, optical equipment, catalysis and the like. The metal silver, gold, platinum and the like are one of important research objects in many research works, and the nano structure of the metal silver, gold, platinum and the like has the advantages of very good plasticity, conductivity, chemical stability, antibacterial and antioxidant properties and the like, so that the metal silver, gold, platinum and the like has very wide application prospects in the industrial fields of integrated circuits, printed electronics, surface Raman enhancement, green furniture, energy, medical treatment, catalysis, electroplating and the like: among them, the preparation and common property exploration of two-dimensional metal nanostructures are the subject of the research in this year, and with the heat of fire of flexible electronic technology and the more diversified application thereof in the life service of people, the metal nanosheets with high quality, ultra-thin, large area size and excellent crystal structure become higher demands in the preparation and research work of metal nanostructures.
At present, the preparation and synthesis work of a two-dimensional metal nanostructure mainly develops around a chemical method, developed and mature synthesis routes comprise methods such as an electrochemical deposition method, a template growth method, a rapid reduction method and wet chemistry, the metal nanosheets prepared and obtained by the methods are more than tens of nanometers in thickness, further breakthrough in thickness is difficult to achieve, the operation of the chemical synthesis route is complex and long, and various auxiliary reagents in the experimental process limit the absolute property of obtaining high-purity metal nanosheets, so that the design of a new synthesis route is a challenge to be faced urgently.
The invention combines the special physical properties of metal materials, and according to a two-dimensional metal nano structure, the preparation scheme is as follows: preparing ethanol dispersion liquid of raw materials, placing the ethanol dispersion liquid between two substrates with highly polished surfaces to form a sandwich structure, then applying certain pressure and temperature to the sandwich structure, preserving heat and maintaining pressure for certain time, and cooling to room temperature to obtain the two-dimensional material attached to the bottom surface of the sediment. According to the scheme, the two-dimensional ultrathin nanostructure is prepared by a mechanical hot-pressing extension method and by utilizing the characteristic that materials such as metal can deform at a certain temperature and carrying out high-temperature and high-pressure treatment on the materials with the metal extension characteristic.
The method can be used for preparing the metal nano sheet with an ultrathin structure, such as a silver nano sheet, the thickness of which can reach 1.7nm, and the nano sheet has the advantages of good integrity, smooth surface, clear and regular atomic phase, consistent structure orientation and single crystal structure. The nano-sheet with the ultrathin structure can also show certain special optical phenomena, such as two sharp PL peaks detected in metallic silver for the first time.
In conclusion, the method for preparing the two-dimensional metal by the hot pressing method provided by the invention has the advantages of short process flow, high production efficiency, flexible component control and the like.
(4) Summary of the invention
1. Objects of the invention
The method can be used for preparing the metal nano sheet with an ultrathin structure, such as a silver nano sheet, the thickness of which can reach 1.7nm, and the nano sheet has the advantages of good integrity, smooth surface, clear and regular atomic phase, consistent structure orientation and single crystal structure. The nano-sheet with the ultrathin structure can also show certain special optical phenomena, such as two sharp PL peaks detected in metallic silver for the first time.
2. The invention of the technology
The key points of the invention are as follows:
(1) preparing the metal precursor solution or metal powder particles (silver nitrate solution, chloroauric acid solution, platinum nitrate solution and metal Nb powder particles) and ethanol into 0.5-2 mg/ml dispersion liquid according to a certain proportion.
(2) And dripping 30-40 microliter of the prepared solution on a silicon wafer, and standing for 5 minutes.
(3) Two silicon chips and a glass sheet are placed into a sandwich structure and placed on a hot press, the temperature is 200-400 ℃, the pressure is 0.7-0.8 Gpa, and the heat preservation and pressure maintaining are carried out for 20-50 min.
(4) And after the temperature is reduced to the room temperature, opening the hot press to obtain a two-dimensional product.
The method for preparing the two-dimensional metal by the hot pressing method has the advantages that: short process flow, high production efficiency and flexible component control, opens up a new way for the production of two-dimensional metal, oxide and polymer with low cost, high quality and high yield, and promotes the basic scientific research and industrial application.
(5) Attached drawings of the invention
FIG. 1 is a high-magnification TEM image of two-dimensional single-crystal Ag prepared by the method of the present invention.
FIG. 2 is a low-magnification TEM image of two-dimensional single-crystal Ag prepared by the method of the present invention.
(6) Examples of the invention
The following describes embodiments of the method of the invention:
example 1
Preparation of two-dimensional Ag nanosheet
Preparing a silver nitrate solution and ethanol into a solution of 0.5mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet of 10cm x 10cm, then using a liquid transfer gun to drop 30-40 microliter of the prepared solution on the silicon wafers, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 200 ℃, the pressure is 0.73Gpa, and the pressure is maintained for 20 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Ag.
Example 2
Preparation of two-dimensional Ag nanosheet
Taking 0.5g of silver nitrate solution, preparing a product obtained by heating and decomposing the silver nitrate solution and ethanol into a solution of 0.5mg/ml according to a certain proportion, putting two silicon wafers with the thickness of 0.7mm on a steel sheet of 10cm x 10cm, taking 30-40 microliters of prepared solution by using a liquid transfer gun, dripping the solution on the silicon wafers, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 200 ℃, the pressure is 0.73Gpa, and the pressure is maintained for 20 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Ag.
Example 3
Preparation of two-dimensional Ag nanosheet
Preparing a silver nitrate solution and ethanol into a solution of 1mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet of 10cm x 10cm, then using a liquid transfer gun to drop 30-40 microliter of the prepared solution on the silicon wafers, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 200 ℃, the pressure is 0.73Gpa, and the pressure is maintained for 20 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Ag.
Example 4
Preparation of two-dimensional Ag nanosheet
Preparing a silver nitrate solution and ethanol into a solution of 1.5mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet of 10cm x 10cm, then using a liquid transfer gun to drop 30-40 microliter of the prepared solution on the silicon wafers, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 250 ℃, the pressure is 0.73Gpa, and the pressure is maintained for 20 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Ag.
Example 5
Preparation of two-dimensional metal Au nanosheet
Preparing 0.5mg/ml solution from chloroauric acid solution and ethanol according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet with the thickness of 10cm x 10cm, dropping 30-40 microliters of the prepared solution on the silicon wafers by using a liquid transfer gun, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 280 ℃, the pressure is 0.7Gpa, and the pressure is maintained for 30 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Au.
Example 6
Preparation of two-dimensional metal Au nanosheet
Preparing a chloroauric acid solution and ethanol into a solution of 1mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet of 10cm x 10cm, taking 30-40 microliters of the prepared solution by using a liquid transfer gun, dripping the solution on the silicon wafers, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 280 ℃, the pressure is 0.7Gpa, and the pressure is maintained for 40 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Au.
Example 7
Preparation of two-dimensional metal Au nanosheet
Preparing a chloroauric acid solution and ethanol into a solution of 1.5mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet with the thickness of 10cm x 10cm, dropping 30-40 microliters of the prepared solution on the silicon wafers by using a liquid transfer gun, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to 300 ℃, the pressure is 0.7Gpa, and the pressure is maintained for 40 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Au.
Example 8
Preparation of two-dimensional metal Pt nanosheet
Preparing a platinum nitrate solution and ethanol into a 0.5mg/ml solution according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet with the thickness of 10cm x 10cm, dipping a cotton swab in the ethanol to wipe the silicon wafers, dropping 30-40 microliters of the prepared solution on the silicon wafers by using a pipetting gun, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 200 ℃, the pressure is 0.73Gpa, and the pressure is maintained for 40 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Pt.
Example 9
Preparation of two-dimensional metal Pt nanosheet
Preparing a platinum nitrate solution and ethanol into a solution of 1mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet of 10cm x 10cm, taking 30-40 microliters of the prepared solution by using a liquid transfer gun, dripping the solution on the silicon wafers, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 200 ℃, the pressure is 0.73Gpa, and the pressure is maintained for 40 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Pt.
Example 10
Preparation of two-dimensional metal Pt nanosheet
Preparing a platinum nitrate solution and ethanol into a solution of 1.5mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet of 10cm x 10cm, dropping 30-40 microliters of the prepared solution on the silicon wafers by using a liquid transfer gun, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 200 ℃, the pressure is 0.73Gpa, and the pressure is maintained for 40 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Pt.
Example 11
Preparation of two-dimensional metal Nb nanosheet
Taking a small amount of Nb powder particles, preparing the Nb powder particles and ethanol into 0.5mg/ml solution according to a certain proportion, taking two silicon wafers with the thickness of 0.7mm, placing the silicon wafers on a steel sheet with the thickness of 10cm x 10cm, taking 30-40 microliter of the prepared solution by a liquid transfer gun, dripping the solution on the silicon wafers, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to 300 ℃, the pressure is 0.8Gpa, and the heat preservation and pressure maintaining are carried out for 30 min. And after the temperature is reduced to the room temperature, opening the hot press to obtain a two-dimensional product Nb.
Example 12
Preparation of two-dimensional metal Nb nanosheet
Taking a small amount of Nb powder particles, preparing the Nb powder particles and ethanol into a solution of 1mg/ml according to a certain proportion, taking two silicon wafers with the thickness of 0.7mm, placing the silicon wafers on a steel sheet of 10cm x 10cm, dipping the ethanol by a cotton swab to wipe the silicon wafers, taking 30-40 microliter of the prepared solution by a liquid transfer gun, dripping the solution on the silicon wafers, and standing for 5 minutes. Placing two silicon wafers and glass sheets into a sandwich structure, placing the sandwich structure on a hot press, setting the temperature at 300 ℃ and the pressure at 0.8Gpa, and keeping the temperature and the pressure for 40 min. And after the temperature is reduced to the room temperature, opening the hot press to obtain a two-dimensional product Nb.
Example 13
Preparation of two-dimensional metal Nb nanosheet
Taking a small amount of Nb powder particles, preparing the Nb powder particles and ethanol into a solution of 2mg/ml according to a certain proportion, taking two silicon wafers with the thickness of 0.7mm, placing the silicon wafers on a steel sheet with the thickness of 10cm x 10cm, taking 30-40 microliter of the prepared solution by a liquid transfer gun, dripping the solution on the silicon wafers, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to 300 ℃, the pressure is 0.8Gpa, and the heat preservation and pressure maintaining are carried out for 30 min. And after the temperature is reduced to the room temperature, opening the hot press to obtain a two-dimensional product Nb.
Example 14
Preparation of two-dimensional Ag nanosheet
Preparing a silver nitrate solution and ethanol into a solution of 1mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet of 10cm x 10cm, dipping cotton swabs in the ethanol to wipe the silicon wafers, dropping 30-40 microliters of the prepared solution on the silicon wafers by using a liquid transfer gun, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 250 ℃, the pressure is 0.73Gpa, and the pressure is maintained for 30 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Ag.
Example 15
Preparation of two-dimensional metal Au nanosheet
Preparing a chloroauric acid solution and ethanol into a solution of 1mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet of 10cm x 10cm, wiping the silicon wafers by using a cotton swab to dip ethanol, dropping 30-40 microliters of the prepared solution on the silicon wafers by using a liquid transfer gun, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to 240 ℃, the pressure is 0.7Gpa, and the pressure is maintained for 40 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Au.
Example 16
Preparation of two-dimensional metal Au nanosheet
Preparing a chloroauric acid solution and ethanol into a solution of 1.5mg/ml according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet with the thickness of 10cm x 10cm, wiping the silicon wafers by using a cotton swab to dip ethanol, dropping 30-40 microliters of the prepared solution on the silicon wafers by using a liquid transfer gun, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to 300 ℃, the pressure is 0.7Gpa, and the pressure is maintained for 40 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Au.
Example 17
Preparation of two-dimensional metal Nb nanosheet
Taking a small amount of Nb powder particles, preparing the Nb powder particles and ethanol into a solution of 2mg/ml according to a certain proportion, taking two silicon wafers with the thickness of 0.7mm, placing the silicon wafers on a steel sheet of 10cm x 10cm, dipping the cotton swab in the ethanol to wipe the silicon wafers, taking 30-40 microliter of the prepared solution by using a liquid transfer gun, dripping the solution on the silicon wafers, and standing for 5 minutes. Placing two silicon wafers and glass sheets into a sandwich structure, placing the sandwich structure on a hot press, setting the temperature to be 250 ℃, setting the pressure to be 0.8Gpa, and keeping the temperature and the pressure for 40 min. And after the temperature is reduced to the room temperature, opening the hot press to obtain a two-dimensional product Nb.
Example 18
Preparation of two-dimensional metal Pt nanosheet
Preparing a 1.5mg/ml solution from a platinum nitrate solution and ethanol according to a certain proportion, placing two silicon wafers with the thickness of 0.7mm on a steel sheet with the thickness of 10cm x 10cm, wiping the silicon wafers by using a cotton swab to dip ethanol, dripping 30-40 microliters of the prepared solution on the silicon wafers by using a liquid transfer gun, and standing for 5 minutes. Two silicon chips and two glass sheets are placed into a sandwich structure and placed on a hot press, the temperature is set to be 250 ℃, the pressure is 0.73Gpa, and the pressure is maintained for 50 min. And opening the hot press after the temperature is reduced to the room temperature to obtain a two-dimensional product Pt.

Claims (1)

1. A method for preparing two-dimensional metal by hot pressing based on solution processing is characterized by comprising the following steps:
(1) preparing the metal precursor solution or metal powder particles (silver nitrate solution, chloroauric acid solution, platinum nitrate solution and niobium metal powder particles) and ethanol into 0.5-2 mg/ml dispersion liquid according to a certain proportion.
(2) And dripping 30-40 microliter of the prepared solution on a silicon wafer, and standing for 5 minutes.
(3) Two silicon chips and a glass sheet are placed into a sandwich structure and placed on a hot press, the temperature is 200-400 ℃, the pressure is 0.7-0.8 Gpa, and the heat preservation and pressure maintaining are carried out for 20-50 min.
(4) And after the temperature is reduced to the room temperature, opening the hot press to obtain a two-dimensional product.
CN202010313677.6A 2020-04-20 2020-04-20 Method for preparing two-dimensional metal through hot pressing based on solution processing Pending CN111644634A (en)

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Publication number Priority date Publication date Assignee Title
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6136061A (en) * 1995-12-01 2000-10-24 Gibson; Charles P. Nanostructured metal compacts, and method of making same
CN104846434A (en) * 2015-04-10 2015-08-19 武汉大学 Two-dimensional transition metal disulfides monocrystalline, and preparation method and applications thereof
TW201802827A (en) * 2016-07-05 2018-01-16 國立成功大學 Preparation method of nano-silver pastes capable of increasing bonding strength of the nano-silver paste by adding silver precursor
CN106587087A (en) * 2016-11-23 2017-04-26 深圳市循真科技有限公司 Two-dimensional nano-sheet and preparation method thereof
CN110722173A (en) * 2019-10-16 2020-01-24 西安工业大学 Silver nanosheet and low-temperature preparation method thereof

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张青云: "二维材料的热压制备及性能研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 *
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Application publication date: 20200911