Method for enhancing field emission performance of single-walled carbon nanotube films by laser nano-welding

A technology of single-walled carbon nanotubes and field emission, applied in laser welding equipment, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem that the development of laser nano-welding technology is not mature enough and limits the development of the field of nanoelectronics And application, fixed one-time welding area and other issues, to achieve the effect of strong mechanical properties, high emission current density, and small contact resistance

Active Publication Date: 2017-10-20
SHANGHAI OCEAN UNIV
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Problems solved by technology

However, due to the difficulty in controlling the experimental environment in the direct growth method, organic residues in the screen printing method, and unreliable connections obtained by the electrophoretic deposition method, it limits its further development and application in the field of nanoelectronics.
At the same time, in order to improve the above method, some scholars proposed a relatively novel ultrasonic nano-welding method, which successfully realized the connection between CNTs and Ti substrates, and the results have been improved, but there are certain deficiencies in ultrasonic nano-welding, such as The fixed primary welding area; the direct contact between the welding head and the nano-material leads to the residue of impurities in the welding area; the relative sliding between the welding head and the sample during the welding process may be caused by the pressing force, these problems limit the ultrasonic nanometer Further Application of Welding in Field Emission Cold Cathode Field
[0004] In view of the current development of laser nano-welding technology is not very mature, the performance is unstable, and production is difficult to scale, it is particularly important to conduct in-depth experiments to study the characteristics of laser nano-welding technology and determine the best welding process

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  • Method for enhancing field emission performance of single-walled carbon nanotube films by laser nano-welding

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Experimental program
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Effect test

Embodiment 1

[0018] The method includes the following steps:

[0019] 1) Pretreatment of the surface of the metal substrate, put the metal substrate into anhydrous ethanol or acetone solution, the metal substrate is any one of Al, Ni, Ti or Cu, and perform ultrasonic cleaning in an ultrasonic pool. The ultrasonic time is 10-15 minutes;

[0020] 2) Depositing a single-walled carbon nanotube film on the surface of the metal substrate treated in step 1) by a deposition method, the deposition method being electrophoretic deposition or spin coating;

[0021] 3) Apply laser nano-welding to the single-wall carbon nanotube film deposited on the surface of the metal substrate in step 2). Under the joint action of laser energy and shock waves, the single-wall carbon nanotube film is pressed into the surface layer of the molten metal substrate. The rapid cooling of the molten metal after scanning, the single-walled carbon nanotube film embedded in the surface of the metal substrate to form a stable ...

Embodiment 2

[0023] The method includes the following steps:

[0024] 1) Pre-treat the surface of the aluminum substrate, put the aluminum substrate in absolute ethanol solution, and ultrasonically clean it in an ultrasonic pool for 10 minutes;

[0025] 2) Deposit single-walled carbon nanotube films on the surface of aluminum by electrophoretic deposition, 2mg single-walled carbon nanotubes and 2mg Mg(NO 3 ) 2 6H 2 O was added in 100ml isopropanol solution to make electrophoresis solution, electrophoresis conditions, stainless steel plate as anode, aluminum as cathode, two electrode spacing 2cm, electrophoresis voltage 30V, electrophoresis time 10min;

[0026] 3) Laser nano-welding is performed on samples deposited with single-walled carbon nanotube films, using picosecond pulse CO 2 Laser, the laser beam diameter is 8μm, the laser wavelength is 1064nm, the laser repetition frequency is 100kHz, the laser power is 50mW, the laser scanning speed is 100mm / min, the negative defocus is 0.08m...

Embodiment 3

[0028] The method includes the following steps:

[0029] 1) Pre-treat the surface of the nickel substrate, put the nickel substrate in acetone solution, and ultrasonically clean it in an ultrasonic pool for 15 minutes;

[0030] 2) Using electrophoretic deposition method to deposit single-walled carbon nanotube film on nickel surface, 2mg single-walled carbon nanotube and 2mg Mg(NO 3 ) 2 6H 2 O was added in 100ml isopropanol solution to make electrophoresis solution, electrophoresis conditions, stainless steel plate as anode, nickel as cathode, two electrode spacing 2cm, electrophoresis voltage 30V, electrophoresis time 8min;

[0031] 3) Laser nano-welding is performed on samples deposited with single-walled carbon nanotube films, using picosecond pulse CO 2 Laser, the beam diameter of the laser is 8μm, the wavelength of the laser is 1064nm, the weight of the laser

[0032] The complex frequency is 100kHz, the laser power is 115mW, the laser scanning speed is 100mm / min, the...

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Abstract

The invention discloses a method for enhancing field emission performance of a single-wall carbon nanotube film by use of laser nanometer welding. The method is characterized by comprising the following steps: 1, the surface of a metal substrate is preprocessed, the metal substrate is placed into an absolute ethyl alcohol or acetone solution, ultrasonic cleaning is performed in an ultrasonic pool; 2, the single-wall carbon nanotube film is precipitated on the processed surface of the metal substrate in the first step by use of a precipitation method; and 3, laser nanometer welding is applied to the single-wall carbon nanotube film precipitated on the surface of the metal substrate in the second step, under the common effect of laser energy and shock waves, the single-wall carbon nanotube film is pressed into a melted metal substrate surface layer, as melted metal is cooled rapidly after laser scanning, the single-wall carbon nanotube film is embedded into the surface of the metal substrate, stable connection between a nanom material and the metal substrate is formed, and the single-wall carbon nanotube film with enhanced field emission performance is obtained. The method provided by the invention is suitable for application in enhancement of field emission performance of a single-wall carbon nanotube film by use of laser nanometer welding.

Description

technical field [0001] The invention relates to a method for enhancing the field emission performance of a single-wall carbon nanotube film, in particular to a method for enhancing the field emission performance of a single-wall carbon nanotube film by laser nano welding. Background technique [0002] One-dimensional nanomaterials have unique structural morphology and excellent electronic properties, and have very important application prospects in the manufacture of nanoelectronic devices. Since Japanese scientist Iijima discovered carbon nanotubes (CNTs) in 1991, due to their special tubular structure, good electrical conductivity, thermal stability, large aspect ratio and small radius of curvature, they have been widely used in the field of field emission cold cathodes. There are outstanding contributions, but the key problem is that it is difficult to form reliable electrical contact between single-walled carbon nanotubes and metal substrates, and the contact resistance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/02B82B3/00B23K26/32B23K103/18B82Y30/00
CPCB23K26/32B23K2103/18B82B3/00H01J9/02H01J9/025
Inventor 刘璇李必奎王鹏波赵煜刘鹏鑫王亚荣孔龙
Owner SHANGHAI OCEAN UNIV
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