CN110335795B - Process for improving field emission performance by processing cathode film - Google Patents
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- CN110335795B CN110335795B CN201910554067.2A CN201910554067A CN110335795B CN 110335795 B CN110335795 B CN 110335795B CN 201910554067 A CN201910554067 A CN 201910554067A CN 110335795 B CN110335795 B CN 110335795B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes
- H01J9/025—Manufacture of electrodes or electrode systems of cold cathodes of field emission cathodes
Abstract
The invention discloses a process for treating a cathode film to improve field emission performance, which regulates and controls field emission points by using different types of adhesive tapes and changing parameters such as adhesive tape treatment times and the like, and enables the adhesive tapes and the field emission cathode film to be treated to be more tightly attached by using a weight compaction means, thereby furthest playing a role in improving the field emission performance by adhesive tape treatment, and achieving the purposes of improving the cathode appearance, reducing the field shielding effect and finally improving the field emission performance. Experimental results prove that the process provided by the invention has a great effect on improving the field emission performance, and the starting of the field emission device and the threshold electric field intensity can be effectively reduced by selecting the optimal process parameters such as the treatment times of the adhesive tape and the like, so that the field emission device with excellent performance is obtained.
Description
Technical Field
The invention belongs to the field of field emission cathode film preparation and treatment, and the field emission point is regulated and controlled by using different types of adhesive tapes and changing parameters such as adhesive tape treatment times and the like, and weights are used for enabling the adhesive tapes and the field emission cathode film to be treated to be more tightly attached, so that the function of improving the field emission performance by adhesive tape treatment is exerted to the maximum extent, and the purposes of improving the cathode appearance, reducing the field shielding effect and finally improving the field emission performance are achieved.
Background
In recent years, with the continuous and intensive research on electron emission technology and the continuous expansion of the application range thereof, field electron emission is a cold cathode emission mode, which receives a great deal of attention from researchers at home and abroad, has potential application in many fields such as flat panel display, X-ray tube and microwave generator, and becomes a hot research problem in the vacuum micro-nano electron industry.
And field emission is formed by reducing the height of a solid surface barrier, compressing the width of the surface barrier, and enabling electrons to pass through or over the top end of the barrier through a tunneling effect. Specifically, under the action of an external high-voltage electric field, due to the fact that the electric field is enhanced near an electrode (namely a field emission cathode) with larger curvature, when the barrier width of the solid surface is reduced to be close to or smaller than the wavelength of electrons, the electrons are emitted through a tunneling effect, and additional energy in other forms is not needed.
At present, there are many researches on using low-dimensional nano materials such as carbon nanotubes, graphene, silicon carbide, zinc oxide and the like and composites thereof as field emission cathodes, and the adopted cathode film preparation methods include screen printing, vacuum filtration, chemical vapor deposition, electrophoresis and the like, but the cost required by chemical vapor deposition is too high, which is not beneficial to the commercial application of field emission devices, and the screen printing, the vacuum filtration and other methods with lower cost are easy to make the cathode material fall on a substrate, so that the number of effective field emission points is rare, and the field emission performance is not very excellent, therefore, how to enhance the field emission performance from the material modification angle becomes a topic worthy of research. Researchers mostly adopt methods of improving the length-diameter ratio, enhancing the adsorption between the tip and the substrate, modifying a cathode material by using other material interfaces, reducing the work function and the like to improve the field emission performance of the cathode material. However, the field shielding effect has been an important factor limiting the field emission performance, and it is required to reduce the field shielding effect by removing a portion of the field emission sites that are not well adsorbed to the substrate.
Disclosure of Invention
The invention aims to regulate and control a field emission point by using different types of adhesive tapes and changing parameters such as adhesive tape processing times and the like, and the adhesive tapes are more tightly attached to a field emission cathode film to be processed by using weights, so that the function of improving the field emission performance by adhesive tape processing is exerted to the maximum extent, and the aims of improving the cathode appearance, reducing the field shielding effect and finally improving the field emission performance are fulfilled. The invention adopts low-dimensional nano materials as cathode film materials, uses different types of adhesive tapes, changes the treatment times, and gives the optimal treatment times so as to enhance the field emission performance to the maximum extent.
The specific technical scheme for realizing the purpose of the invention is as follows:
a process for treating a cathode film to improve field emission performance, the process comprising the steps of:
step 1: adhesive tape treatment
(1) Pretreatment of adhesive tapes
Tearing the selected adhesive tape for 2-10 cm, repeatedly adhering the adhesive tape to an object with a clean and flat surface or the adhesive tape per se for 10-500 times, and changing the adhesive force of the adhesive tape by changing the pretreatment times of the adhesive tape;
(2) adhesive tape tearing treatment of cathode film
And uniformly and flatly sticking the treated adhesive tape to a field emission cathode film, wherein the cathode film comprises but is not limited to carbon nano tubes, graphene, silicon carbide, zinc oxide low-dimensional nano materials and composites thereof. And placing a weight of 50-1000 g to enable the adhesive tape to uniformly and flatly cover the field emission cathode film, and then taking off the adhesive tape.
Step 2: testing field emission performance of cathode film
Assembling the field emission cathode film treated by the adhesive tape into a field emission device, placing the field emission device in a vacuum system to test the field emission performance, connecting a circuit, recording current and voltage values, and calculating current density and electric field intensity; the result of the field emission performance test shows that the adhesive tape can be tightly attached to the field emission cathode film to be treated by using the weight, and the effect of improving the field emission performance by treating the adhesive tape is exerted to the maximum extent. After the tape treatment, the opening electric field of the field emission cathode device is reduced to 1.51-2.06V/mum from 2.39V/mum when the tape treatment is not carried out, and the threshold electric field is reduced to 1.71-2.59V/mum from 3.13V/mum when the tape treatment is not carried out.
The object with a clean and flat surface is glass, plastic, a stainless steel plate or a copper foil.
The adhesive tape comprises a PI adhesive tape, a PET adhesive tape and a PVA adhesive tape.
The invention has the beneficial effects that: the weight compaction process provided by the method can ensure that the adhesive tape is more tightly attached to the field emission cathode film to be processed, and the effect of processing the adhesive tape to improve the field emission performance is exerted to the maximum extent.
Drawings
FIG. 1 is a schematic cross-sectional view of a PET tape treated multi-walled carbon nanotube field emission cathode film according to an embodiment of the present invention;
FIG. 2 is a photograph of a multi-walled carbon nanotube cathode film treated with PET tape for different times, which is a photograph of the cathode film treated with adhesive tapes of 200, 300 and 400 times from left to right in sequence;
FIG. 3 is a graph comparing the field emission performance of devices after different times of tape treatment of a multi-walled carbon nanotube cathode film using PET tape in accordance with one embodiment of the present invention; (a) the current density is a relation graph of the electric field intensity; (b) the influence graph of the adhesive tape processing times on the opening electric field intensity of the device is shown;
FIG. 4 is a graph comparing the effect of different types of tape treatments on field emission performance in examples of the present invention.
Detailed Description
The techniques employed in the present invention will be described in detail below, and the described embodiments are only some of the embodiments in the present invention. Other embodiments within the scope of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein.
Example 1
A process for treating a cathode film to improve field emission performance comprises the following specific steps:
step 1: preparing field emission cathode film
Mixing terpineol and ethyl cellulose in a mass ratio of 20:1, and fully stirring in a water bath at 80 ℃ to uniformly mix to form a viscous and transparent colloid, namely the organic adhesive;
mixing the multi-wall carbon nanotube powder serving as the field emission cathode material and the organic binder according to the mass ratio of 1:8, and thoroughly grinding for 30 minutes until the field emission cathode material is fully dispersed, namely no particles are seen by naked eyes. Next, a field emission cathode material is coated on the clean FTO conductive glass substrate by a screen printing method to obtain a desired field emission cathode film. Then, it was placed in a muffle furnace having a set temperature of 350 ℃ and baked for 2 hours to remove the organic binder.
Step 2: adhesive tape treatment
(1) Pretreatment of adhesive tapes
Tearing the selected PET adhesive tape by 5cm, repeatedly adhering the PET adhesive tape on the adhesive tape for 100 times, and changing the adhesive force of the adhesive tape by changing the pretreatment times of the adhesive tape;
(2) adhesive tape tearing treatment of cathode film
Referring to fig. 1, the pre-treated PET tape was uniformly and smoothly attached to the field emission cathode film to be treated, a 500g weight was placed thereon so that the tape smoothly covered the field emission cathode film, and then removed. Because of the different viscosity of the treated adhesive tape, the number of field emission points taken away in the adhesive tape treatment process is different.
And step 3: testing field emission performance of cathode film
Assembling the field emission cathode film after the adhesive tape treatment into a field emission device, and placing the field emission device in a field emission test vacuum system; the result of the field emission performance test shows that the starting of the field emission device and the threshold electric field intensity can be effectively reduced by selecting proper adhesive tape processing technological parameters, so that the field emission device with excellent performance is obtained.
Example 2
A process for treating a cathode film to improve field emission performance comprises the following specific steps:
step 1: preparing field emission cathode film
Mixing terpineol and ethyl cellulose in a mass ratio of 20:1, and fully stirring in a water bath at 80 ℃ to uniformly mix to form a viscous and transparent colloid, namely the organic adhesive;
mixing the multi-wall carbon nanotube powder serving as the field emission cathode material and the organic binder according to the mass ratio of 1:8, and thoroughly grinding for 30 minutes until the field emission cathode material is fully dispersed, namely no particles are seen by naked eyes. Next, a field emission cathode material is coated on the clean FTO conductive glass substrate by a screen printing method to obtain a desired field emission cathode film. Then, it was placed in a muffle furnace having a set temperature of 350 ℃ and baked for 2 hours to remove the organic binder.
Step 2: adhesive tape treatment
(1) Pretreatment of adhesive tapes
Tearing the selected PET adhesive tape by 5cm, repeatedly adhering the PET adhesive tape on the adhesive tape for 300 times, and changing the adhesive force of the adhesive tape by changing the pretreatment times of the adhesive tape;
(2) adhesive tape tearing treatment of cathode film
Referring to fig. 1, the pre-treated PET tape was uniformly and smoothly attached to the field emission cathode film to be treated, a 500g weight was placed thereon so that the tape smoothly covered the field emission cathode film, and then removed. Due to the different viscosity of the treated tape, the number of field emission points carried away during the tape treatment process is different, as shown in fig. 2.
And step 3: testing field emission performance of cathode film
Assembling the field emission cathode film after the adhesive tape treatment into a field emission device, and placing the field emission device in a field emission test vacuum system; the result of the field emission performance test shows that the starting of the field emission device and the threshold electric field intensity can be effectively reduced by selecting proper adhesive tape processing technological parameters, so that the field emission device with excellent performance is obtained. Fig. 3(a) and (b) show the current density versus electric field strength curves and the on-field strength curves as a function of the number of tape treatments, respectively, after different numbers of treatments with PET tape. Fig. 4 shows the current density versus electric field strength without tape treatment and with different types of tape material after the same number of tape treatments.
Example 3
A process for treating a cathode film to improve field emission performance comprises the following specific steps:
step 1: preparing field emission cathode film
Mixing terpineol and ethyl cellulose in a mass ratio of 20:1, and fully stirring in a water bath at 80 ℃ to uniformly mix to form a viscous and transparent colloid, namely the organic adhesive;
mixing the multi-wall carbon nanotube powder serving as the field emission cathode material and the organic binder according to the mass ratio of 1:8, and thoroughly grinding for 30 minutes until the field emission cathode material is fully dispersed, namely no particles are seen by naked eyes. Next, a field emission cathode material is coated on the clean FTO conductive glass substrate by a screen printing method to obtain a desired field emission cathode film. Then, it was placed in a muffle furnace having a set temperature of 350 ℃ and baked for 2 hours to remove the organic binder.
Step 2: adhesive tape treatment
(1) Pretreatment of adhesive tapes
Tearing the selected PET adhesive tape by 5cm, repeatedly adhering the PET adhesive tape on the adhesive tape for 500 times, and changing the adhesive force of the adhesive tape by changing the pretreatment times of the adhesive tape;
(2) adhesive tape tearing treatment of cathode film
Referring to fig. 1, the pre-treated PET tape was uniformly and smoothly attached to the field emission cathode film to be treated, a 500g weight was placed thereon so that the tape smoothly covered the field emission cathode film, and then removed. Because of the different viscosity of the treated adhesive tape, the number of field emission points taken away in the adhesive tape treatment process is different.
And step 3: testing field emission performance of cathode film
Assembling the field emission cathode film after the adhesive tape treatment into a field emission device, and placing the field emission device in a field emission test vacuum system; the result of the field emission performance test shows that the starting of the field emission device and the threshold electric field intensity can be effectively reduced by selecting proper adhesive tape processing technological parameters, so that the field emission device with excellent performance is obtained.
Example 4
A process for treating a cathode film to improve field emission performance comprises the following specific steps:
step 1: preparing field emission cathode film
Mixing terpineol and ethyl cellulose in a mass ratio of 20:1, and fully stirring in a water bath at 80 ℃ to uniformly mix to form a viscous and transparent colloid, namely the organic adhesive;
mixing the multi-wall carbon nanotube powder serving as the field emission cathode material and the organic binder according to the mass ratio of 1:8, and thoroughly grinding for 30 minutes until the field emission cathode material is fully dispersed, namely no particles are seen by naked eyes. Next, a field emission cathode material is coated on the clean FTO conductive glass substrate by a screen printing method to obtain a desired field emission cathode film. Then, it was placed in a muffle furnace having a set temperature of 350 ℃ and baked for 2 hours to remove the organic binder.
Step 2: adhesive tape treatment
(1) Pretreatment of adhesive tapes
Tearing the selected PI adhesive tape for 5cm, repeatedly adhering the PI adhesive tape on the PI adhesive tape for 300 times, and changing the adhesive force of the PI adhesive tape by changing the pretreatment times of the PI adhesive tape;
(2) adhesive tape tearing treatment of cathode film
Uniformly and flatly sticking the pretreated PI adhesive tape to the field emission cathode film to be treated, placing a 500g weight so that the adhesive tape flatly covers the field emission cathode film, and then removing the PI adhesive tape. Because of the different viscosity of the treated adhesive tape, the number of field emission points taken away in the adhesive tape treatment process is different.
And step 3: testing field emission performance of cathode film
Assembling the field emission cathode film after the adhesive tape treatment into a field emission device, and placing the field emission device in a field emission test vacuum system; the result of the field emission performance test shows that the starting of the field emission device and the threshold electric field intensity can be effectively reduced by selecting proper adhesive tape processing technological parameters, so that the field emission device with excellent performance is obtained.
The results of the invention are:
(1) the field emission performance of the device treated by the adhesive tape is superior to that of the device not treated by the adhesive tape;
(2) the device treated by the PET adhesive tape has better performance;
(3) the adhesive tape has different treatment times and different influences on the field emission performance;
(4) the device treated with the PET tape 300 times has the most excellent field emission performance, the turn-on electric field of the device is reduced to 1.51V/mum, and the threshold electric field of the device is reduced to 1.71V/mum.
The examples described are the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any obvious modifications and substitutions by those skilled in the art can be made without departing from the spirit of the present invention, and the scope of the present invention shall be covered by the claims.
Claims (3)
1. A process for treating a cathode film to improve field emission performance is characterized by comprising the following steps:
step 1: adhesive tape treatment
(1) Pretreatment of adhesive tapes
Tearing the selected adhesive tape for 2-10 cm, repeatedly adhering the adhesive tape to an object with a clean and flat surface or the adhesive tape per se for 10-500 times, and changing the adhesive force of the adhesive tape by changing the pretreatment times of the adhesive tape;
(2) adhesive tape tearing treatment of cathode film
Uniformly and flatly sticking the treated adhesive tape on the field emission cathode film, placing a weight with the weight of 50-1000 g to enable the adhesive tape to uniformly and flatly cover the field emission cathode film, and then taking off the adhesive tape; wherein the cathode film comprises but is not limited to carbon nano-tube, graphene, silicon carbide, zinc oxide low-dimensional nano-material or compound thereof;
step 2: testing field emission performance of cathode film
Assembling the field emission cathode film treated by the adhesive tape into a field emission device, placing the field emission device in a vacuum system to test the field emission performance, connecting a circuit, recording current and voltage values, and calculating current density and electric field intensity; the result shows that the opening electric field of the field emission cathode device is reduced to 1.51-2.06V/mum from 2.39V/mum when the adhesive tape is not processed, and the threshold electric field is reduced to 1.71-2.59V/mum from 3.13V/mum when the adhesive tape is not processed.
2. The process of claim 1, wherein the clean, flat surface object is glass, plastic, stainless steel plate, or copper foil.
3. The process of claim 1, wherein the tape is a PI, PET, or PVA tape.
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