Terahertz wave generator of carbon nanotube-graphene heterojunction cold cathode

Abstract

The invention relates to the technical field of terahertz generators, in particular to a terahertz wave generator of a carbon nanotube-graphene heterojunction cold cathode, which comprises a contact part, a displacement device is slidably mounted at the side end of the contact part, and a heat dissipation fan is fixedly mounted at the top end of the contact part. The displacement device comprises a terahertz wave generator, connecting rods and a matching plate, the connecting rods are symmetrically and fixedly installed at the top end of the terahertz wave generator, the terahertz wave generator is fixedly installed at the side end of the matching plate, and the contact component comprises a butt joint device, a cleaning device, a shunting device, a positioning device and a supporting substrate. The positioning device is fixedly installed at the top of the side end of the supporting base plate, the flow dividing device is fixedly installed at the top end of the positioning device, and the butt joint devices are slidably installed on the two sides of the positioning device. Through the arrangement of the displacement device and the contact device, the purpose of integrating rapid installation and rapid cooling of the terahertz wave generator is achieved.

Description

Technical Field

[0001] This invention relates to the field of terahertz generator technology, specifically to a terahertz wave generator with a carbon nanotube-graphene heterojunction cold cathode. Background Technology

[0002] Terahertz waves typically refer to electromagnetic waves with frequencies ranging from 0.1 to 10 THz (wavelengths of approximately 3 mm to 30 μm), falling between microwaves and infrared light. Terahertz wave generators are key devices for generating this radiation and have wide applications in fields such as imaging, communication, biomedicine, and security detection.

[0003] The graphene heterojunction cold cathode is a novel electron emission source based on graphene materials. It utilizes the unique band structure and interface effect to achieve efficient electron emission without heating (cold cathode). This technology has potential application value in terahertz radiation sources, vacuum electronic devices, field emission displays and other fields.

[0004] Currently, terahertz wave generators with graphene heterojunction cold cathodes on the market require external tools for installation due to bolt-type positioning. Furthermore, existing terahertz wave generators suffer from inefficient cooling due to natural cooling during long-term high-load operation, leading to overheating or heat dissipation difficulties. Therefore, an improved device is needed to address these issues. Summary of the Invention

[0005] To address the problems in the prior art, this invention provides a terahertz wave generator with a carbon nanotube-graphene heterojunction cold cathode.

[0006] The technical solution adopted by this invention to solve its technical problem is: a terahertz wave generator of a carbon nanotube-graphene heterojunction cold cathode, including a contact component, a displacement device slidably mounted on the side end of the contact component, and a cooling fan fixedly mounted on the top end of the contact component. The displacement device includes a terahertz wave generator, a connecting rod, and a mating plate. The connecting rod is symmetrically fixedly mounted on the top end of the terahertz wave generator, and the terahertz wave generator is fixedly mounted on the side end of the mating plate. The contact component includes a docking device, a cleaning device, a diversion device, a positioning device, and a supporting substrate. The positioning device is fixedly mounted on the top side end of the supporting substrate, the diversion device is fixedly mounted on the top end of the positioning device, the docking device is slidably mounted on both sides of the positioning device, and the cleaning device is slidably mounted on the side end of the docking device opposite to the positioning device.

[0007] Specifically, the docking device includes a first gear, a second gear, a shaft, a vertical rod, heat dissipation fins, a first flow guiding cavity, a connecting base plate, and an impeller. The heat dissipation fins are fixedly installed at the bottom end of the connecting base plate. The first flow guiding cavity is symmetrically fixedly installed on the top side end of the heat dissipation fins. The impeller is rotatably installed on the top side end of the heat dissipation fins and is located below the first flow guiding cavity. The first gear is fixedly installed on the side end of the impeller. The shaft is rotatably installed on the top side end of the heat dissipation fins and is located below the impeller. The second gear is fixedly installed at one end of the shaft. The vertical rod is fixedly installed on the side end of the heat dissipation fins.

[0008] Specifically, the cleaning device includes a push plate, a displacement crossbeam, and a first connecting rope. The first connecting rope is symmetrically fixedly installed at the top of the displacement crossbeam, and the push plate is equidistantly fixedly installed on the inner side of the displacement crossbeam.

[0009] Specifically, the diversion device includes a second flow guiding cavity and an air guiding cavity, with the second flow guiding cavity symmetrically and fixedly installed at the bottom end of the air guiding cavity.

[0010] Specifically, the positioning device includes a limiting frame, a guide rod, a first spring, a supporting top plate, a rack, a spool, a second connecting rope, a third gear, a photoelectric sensor, a base plate, a lever, a limiting rod, and a second spring. The spool is symmetrically rotated and mounted on the top front end of the rack. The third gear is fixedly mounted on the rear center of the spool. The second connecting rope is fixedly mounted on the outer ring of the spool. The rack is symmetrically slidably inserted into the inner front end of the supporting top plate, and the rack is located at the side end of the third gear. The guide rod and the first spring are symmetrically fixedly mounted on both sides of the supporting top plate, and the guide rod is located inside the first spring. The photoelectric sensor is fixedly mounted on the top rear end of the supporting top plate. The base plate is fixedly mounted on the inner rear end of the supporting top plate, and the base plate is located below the photoelectric sensor. The limiting rod is symmetrically slidably inserted into the front end of the base plate. The limiting frame is fixedly mounted on the front end of the guide rod. The second spring is fixedly mounted between the base plate and the limiting frame. The lever is fixedly mounted on the rear center of the limiting frame.

[0011] Specifically, the mating plate is slidably installed inside the side end of the supporting base plate, the connecting base plate is slidably sleeved on the guide rod, the end of the first spring away from the supporting top plate is connected to the connecting base plate, the first gear meshes with the second gear, the top end of the first connecting rope is connected to the shaft, the displacement crossbar is slidably sleeved on the outer ring of the vertical rod, the air guide cavity is fixedly installed on the top of the supporting top plate, the supporting top plate is fixedly installed on the top of the side end of the supporting base plate, the end of the second connecting rope away from the third gear is connected to the connecting base plate, and the rack meshes with the third gear.

[0012] Specifically, the mating plate has key locks fixedly installed on both sides, and the inner side of the support base plate has symmetrical slots. The top of the connecting rod is inclined at 45°, and the outer ring of the connecting rod has a limiting groove.

[0013] Specifically, the tooth distribution angle on the first gear is 270°, and the transmission ratio between the first gear and the second gear is 1:10. Inclined plates are installed at the bottom of the inner ends of the first and second guide cavities, and the first guide cavity is vertically aligned with the impeller. The push plate is hollow inside.

[0014] Specifically, the top of the air guide cavity is inclined at 45°, and the air guide cavity is interconnected with the second air guide cavity. Through holes are opened on both sides of the interior of the supporting top plate. The bottom of the air guide cavity is connected to the through holes. The photoelectric sensor is electrically connected to the cooling fan. Circular holes are symmetrically opened inside the supporting top plate, and the connecting rod is vertically aligned with the circular holes.

[0015] Specifically, the cooling fan also includes a filter and a connecting cavity. The connecting cavity is fixedly installed at the top of the cooling fan, and the filter is fixedly installed inside the rear end of the connecting cavity.

[0016] The beneficial effects of this invention are:

[0017] First, when the terahertz wave generator moves upward, it can cause the connecting rod to contact the limiting frame, so that the limiting frame can restrict and fix the terahertz wave generator. At the same time, when the terahertz wave generator moves upward, it can contact the photoelectric sensor, which can activate the cooling fan to exhaust the air into the air chamber. Furthermore, the mating plate can drive the terahertz wave generator to move upward in a straight line inside the supporting substrate, thereby improving the docking accuracy of the connecting rod and the limiting frame and completing the work of quickly positioning and installing the terahertz wave generator.

[0018] Second, this invention delivers air into the airflow chamber via a cooling fan, allowing the air to pass over the surface of the cooling fins and the surface of the terahertz wave generator. This allows the heat generated by the terahertz wave generator during operation to be conducted to the cooling fins. When the air passes through the interior of the cooling fins, it can accelerate the heat dissipation efficiency of the terahertz wave generator. Furthermore, when the air is delivered through the airflow chamber, some of the air can enter the interior of the first airflow chamber, thereby blowing the impeller to rotate and causing the displacement crossbar to move upward. The push plate can remove impurities inside the cooling fins, completing the self-cleaning function of the cooling fins. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1This is a three-dimensional structural diagram of the main body from a frontal perspective in this invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the displacement device from the front view in this invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the contact component from a frontal view in this invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the docking device from the front view in this invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the cleaning device from the front view in this invention;

[0025] Figure 6 This is a partial cross-sectional schematic diagram of the diversion device in this invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the positioning device from the front view in this invention;

[0027] Figure 8 This is a partial cross-sectional schematic diagram of the second embodiment of the cooling fan in this invention.

[0028] In the diagram: 1-Displacement device, 2-Contact component, 3-Cooling fan, 4-Terahertz wave generator, 5-Connecting rod, 6-Matching plate, 7-Dating device, 8-Cleaning device, 9-Flow diversion device, 10-Positioning device, 11-Supporting base plate, 12-First gear, 13-Second gear, 14-Shaft, 15-Vertical rod, 16-Cooling fins, 17-First flow guide cavity, 18-Connecting base plate, 19-Impeller, 20-Push 21-Plate, 22-Displacement crossbeam, 23-First connecting rope, 24-Second guide cavity, 25-Air guide cavity, 26-Restriction frame, 27-Guide rod, 28-First spring, 29-Supporting top plate, 30-Rack, 31-Spindle, 32-Third gear, 33-Photoelectric sensor, 34-Base plate, 35-Actuating rod, 36-Restriction rod, 37-Second spring, 38-Filter screen, 39-Connecting cavity. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] The invention will be further described below with reference to the accompanying drawings.

[0031] Example 1

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, the terahertz wave generator of the carbon nanotube-graphene heterojunction cold cathode of the present invention includes a contact component 2, a displacement device 1 slidably mounted on the side end of the contact component 2, and a cooling fan 3 fixedly mounted on the top end of the contact component 2. The displacement device 1 includes a terahertz wave generator 4, a connecting rod 5, and a mating plate 6. The connecting rod 5 is symmetrically fixedly mounted on the top end of the terahertz wave generator 4, and the terahertz wave generator 4 is fixedly mounted on the side end of the mating plate 6. The contact component 2 includes a docking device 7, a cleaning device 8, a diversion device 9, a positioning device 10, and a support substrate 11. The positioning device 10 is fixedly mounted on the top side end of the support substrate 11, the diversion device 9 is fixedly mounted on the top end of the positioning device 10, the docking device 7 is slidably mounted on both sides of the positioning device 10, and the cleaning device 8 is slidably mounted on the side end of the docking device 7 away from the positioning device 10.

[0033] like Figure 4 The docking device 7 includes a first gear 12, a second gear 13, a shaft 14, a vertical rod 15, heat dissipation fins 16, a first flow guide cavity 17, a connecting base plate 18, and an impeller 19. The heat dissipation fins 16 are fixedly installed at the bottom end of the connecting base plate 18. The first flow guide cavity 17 is symmetrically fixedly installed at the top of the side end of the heat dissipation fins 16. The impeller 19 is rotatably installed at the top of the side end of the heat dissipation fins 16, and the impeller 19 is located below the first flow guide cavity 17. The first gear 12 is fixedly installed... At the side end of the impeller 19, the shaft 14 is rotatably mounted on the top of the side end of the heat dissipation fins 16, and the shaft 14 is located below the impeller 19. The second gear 13 is fixedly mounted at one end of the shaft 14, and the vertical rod 15 is fixedly mounted on the side end of the heat dissipation fins 16. Since the push plate 20, the displacement crossbeam 21, the impeller 19, the first gear 12, the second gear 13 and the shaft 14 are all made of plastic, it is easy for the first gear 12 to rotate when the air blows the impeller 19.

[0034] like Figure 5 The cleaning device 8 includes a push plate 20, a displacement crossbeam 21 and a first connecting rope 22. The first connecting rope 22 is symmetrically fixed at the top of the displacement crossbeam 21, and the push plate 20 is fixedly installed at equal intervals on the inner side of the displacement crossbeam 21. When the push plate 20 moves up and down, it can remove the impurities accumulated on the inner wall of the heat dissipation fins 16.

[0035] like Figure 6The diversion device 9 includes a second flow guide cavity 23 and an air guide cavity 24. The second flow guide cavity 23 is symmetrically fixedly installed at the bottom end of the air guide cavity 24. The second flow guide cavity 23 and the air guide cavity 24 are connected so that the air generated by the cooling fan 3 when it is working can be discharged downward.

[0036] like Figure 7 The positioning device 10 includes a limiting frame 25, a guide rod 26, a first spring 27, a supporting top plate 28, a rack 29, a spool 30, a second connecting rope 31, a third gear 32, a photoelectric sensor 33, a base plate 34, a toggle lever 35, a limiting rod 36, and a second spring 37. The spool 30 is symmetrically rotated and mounted on the top front end of the rack 29. The third gear 32 is fixedly mounted on the rear center of the spool 30. The second connecting rope 31 is fixedly mounted on the outer ring of the spool 30. The rack 29 is symmetrically slidably inserted into the inner front end of the supporting top plate 28, and the rack 29 is located on the side end of the third gear 32. The guide rod 26 and the first spring 27 are symmetrically fixedly mounted on both sides of the supporting top plate 28, and the guide rod 26 is located on the side end of the first spring 37. Inside the spring 27, the photoelectric sensor 33 is fixedly installed at the top rear end of the supporting top plate 28, and the bottom plate 34 is fixedly installed inside the rear end of the supporting top plate 28, with the bottom plate 34 located below the photoelectric sensor 33. The limiting rod 36 is symmetrically slidably inserted into the front end of the bottom plate 34. The limiting frame 25 is fixedly installed at the front end of the guide rod 26. The second spring 37 is fixedly installed between the bottom plate 34 and the limiting frame 25. The toggle rod 35 is fixedly installed at the center of the rear end of the limiting frame 25. A socket is installed at the bottom end of the supporting top plate 28, and a plug is installed at the top end of the terahertz wave generator 4, which allows the plug to be inserted into the socket when the terahertz wave generator 4 moves upward to its limit position, thus completing the connection of the terahertz wave generator 4.

[0037] The mating plate 6 is slidably installed inside the side end of the support base plate 11. The connecting base plate 18 is slidably sleeved on the guide rod 26. The end of the first spring 27 away from the support top plate 28 is connected to the connecting base plate 18. The first gear 12 meshes with the second gear 13. The top end of the first connecting rope 22 is connected to the shaft 14. The displacement crossbar 21 is slidably sleeved on the outer ring of the vertical rod 15. The air guide cavity 24 is fixedly installed on the top end of the support top plate 28. The support top plate 28 is fixedly installed on the top side end of the support base plate 11. The end of the second connecting rope 31 away from the third gear 32 is connected to the connecting base plate 18. The rack 29 meshes with the third gear 32. The mating plate 6 has keyholes fixedly installed on both sides, and the inner side of the support base plate 11 has symmetrical slots. The top end of the connecting rod 5 is at a 4-degree angle. The connecting rod 5 is inclined at 5° and has a limiting groove on its outer ring. The teeth of the first gear 12 are distributed at an angle of 270° and the transmission ratio between the first gear 12 and the second gear 13 is 1:10. The bottom of the first guide cavity 17 and the second guide cavity 23 are both equipped with inclined plates. The first guide cavity 17 is vertically aligned with the impeller 19. The push plate 20 is hollow inside. The top of the air guide cavity 24 is inclined at 45° and is interconnected with the second guide cavity 23. The supporting top plate 28 has through holes on both sides inside. The bottom of the air guide cavity 24 is connected to the through holes. The photoelectric sensor 33 is electrically connected to the cooling fan 3. The supporting top plate 28 has symmetrically opened round holes inside. The connecting rod 5 is vertically aligned with the round holes.

[0038] The working principle of Example 1 is as follows: In use, the support base plate 11 is first installed on an external device, and then the terahertz wave generator 4 is installed on the side of the mating plate 6. Subsequently, the locking keys on both sides of the mating plate 6 can be inserted into the locking slots on the inner side of the support base plate 11, and then the terahertz wave generator 4 is pushed upward, so that the terahertz wave generator 4 can move upward in a straight line. When the terahertz wave generator 4 drives the connecting rod 5 to move through the round hole inside the support top plate 28, the top end of the connecting rod 5 can first contact the limiting frame 25. Because the top end of the connecting rod 5 is set at a 45° angle, the limiting frame 25 can be squeezed to move downward. At the same time, the terahertz wave generator 4 will also contact the bottom end of the rack 29, so that the terahertz wave generator 4 can be pushed when moving. The rack 29 moves upward along the surface of the third gear 32, allowing the spool 30 to pull the connecting base plate 18 towards one end of the terahertz wave generator 4 via the second connecting rope 31. When the terahertz wave generator 4 compresses the rack 29 to its limit position, the second connecting rope 31 pulls the connecting base plate 18, causing the heat dissipation fins 16 to fully contact the surface of the terahertz wave generator 4. Furthermore, the limiting groove on the outer ring of the connecting rod 5 can be moved to be horizontally aligned with the limiting frame 25. At this time, the elasticity of the second spring 37 will cause the limiting frame 25 to move into the limiting groove, thus fixing the connecting rod 5 and preventing it from falling downwards. Additionally, the top of the connecting rod 5 will contact the photoelectric sensor 33, and the photoelectric sensor 33 will connect with the cooling fan 3. When the electrical connection is established, the cooling fan 3 can be activated. At this time, the cooling fan 3 delivers outside air into the air guide cavity 24. The air guide cavity 24 communicates with the second air guide cavity 23, allowing air to enter the second air guide cavity 23. Furthermore, when the heat dissipation fins 16 move to contact the surface of the terahertz wave generator 4, the first air guide cavity 17 can align with the second air guide cavity 23, allowing air from the air guide cavity 24 to enter the second air guide cavity 23. Simultaneously, the alignment of the air guide cavity 24 with the heat dissipation fins 16 allows some air to pass through the interior of the heat dissipation fins 16. The temperature generated by the terahertz wave generator 4 during operation is conducted to the heat dissipation fins 16, and the air passes through the spaces within the heat dissipation fins 16... The gap allows heat to be carried away, improving the stability of the terahertz wave generator 4 during operation and preventing heat from affecting its operation. Simultaneously, when air enters the first guide cavity 17 from the second guide cavity 23, it drives the impeller 19 to rotate, which in turn drives the first gear 12. The first gear 12 meshes with the second gear 13, causing the second gear 13 to rotate. When the second gear 13 rotates, it drives the shaft 14 to wind up the first connecting rope 22. This causes the displacement crossbeam 21 to move the push plate 20 upwards along the inner wall of the heat dissipation fins 16, allowing the push plate 20 to remove impurities accumulated on the inner wall of the heat dissipation fins 16. Furthermore, the push plate 20 is hollow inside.This allows air to flow easily through the push plate 20 inside the heat dissipation fins 16. Furthermore, the displacement crossbar 21, slidably sleeved on the outer ring of the vertical rod 15, ensures that the displacement crossbar 21 moves vertically in a straight line. Subsequently, when the first gear 12 rotates 270°, it disengages from the second gear 13, causing the displacement crossbar 21 to move downwards. At this time, as the push plate 20 moves downwards to reset, it cleans the inner wall of the heat dissipation fins 16 again. When the terahertz wave generator 4 needs to be disassembled and removed during use, the lever 35 can be pulled towards the rear until the limiting frame 25 moves out of the limiting groove on the outer ring of the connecting rod 5. Then, the terahertz wave generator 4 is slid downwards. At this time, the connecting rod 5 can disengage from the photoelectric sensor 33, the cooling fan 3 is de-energized, and the first... The elasticity of spring 27 causes the connecting base plate 18 to move outward and reset. During reset, the connecting base plate 18 can be pulled by the second connecting rope 31 to rotate the spool 30. When the spool 30 rotates in the opposite direction, it can drive the rack 29 downward and reset via the third gear 32 until the terahertz wave generator 4 is completely disengaged from the rack 29. After this, the connecting base plate 18 can be fully reset, facilitating the disengagement of the heat sink fins 16 from the terahertz wave generator 4. Furthermore, the connecting base plate 18 slides onto the outer ring of the guide rod 26, supporting the heat sink fins 16 to move backward in a straight line, improving the accuracy of the connection between the heat sink fins 16 and the terahertz wave generator 4. Then, the terahertz wave generator 4 is moved downward until the mating plate 6 is removed from the inside of the support base plate 11, completing the disassembly of the terahertz wave generator 4.

[0039] Example 2

[0040] Based on Example 1, such as Figure 8 As shown, the cooling fan 3 also includes a filter 38 and a connecting cavity 39. The connecting cavity 39 is fixedly installed at the top of the cooling fan 3, and the filter 38 is fixedly installed inside the rear end of the connecting cavity 39.

[0041] In this embodiment, the connecting cavity 39 is connected to the cooling fan 3, and the end of the connecting cavity 39 near the filter 38 is connected to the outside. This allows the cooling fan 3 to deliver air from the connecting cavity 39 to the interior of the air guide cavity 24 when it is running. At the same time, the filter 38 is installed inside the connecting cavity 39 to isolate larger impurities from the outside from entering the interior of the cooling fan 3, thus completing the work.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A terahertz wave generator of carbon nanotube-graphene heterojunction cold cathode, comprising a contact component (2), a displacement device (1) is slidingly installed on the side end of the contact component (2), and a heat dissipation fan (3) is fixedly installed on the top end of the contact component (2), characterized in that: The displacement device (1) includes a terahertz wave generator (4), a connecting rod (5), and a mating plate (6). The connecting rod (5) is symmetrically fixedly installed on the top of the terahertz wave generator (4). The terahertz wave generator (4) is fixedly installed on the side end of the mating plate (6). The contact component (2) includes a docking device (7), a cleaning device (8), a diverting device (9), a positioning device (10), and a supporting base plate (11). The positioning device (10) is fixedly installed on the top of the side end of the supporting base plate (11). The diverting device (9) is fixedly installed on the top of the positioning device (10). The docking device (7) is slidably installed on both sides of the positioning device (10). The cleaning device (8) is slidably installed on the side end of the docking device (7) away from the positioning device (10).

2. The terahertz-wave generator of claim 1, wherein the carbon nanotube-graphene heterostructure cold cathode is characterized by: The docking device (7) includes a first gear (12), a second gear (13), a shaft (14), a vertical rod (15), a heat dissipation fin (16), a first flow guide cavity (17), a connecting base plate (18), and an impeller (19). The heat dissipation fin (16) is fixedly installed at the bottom end of the connecting base plate (18). The first flow guide cavity (17) is symmetrically fixedly installed at the top of the side end of the heat dissipation fin (16). The impeller (19) is rotatably installed at the top of the side end of the heat dissipation fin (16) and is located below the first flow guide cavity (17). The first gear (12) is fixedly installed at the side end of the impeller (19). The shaft (14) is rotatably installed at the top of the side end of the heat dissipation fin (16) and is located below the impeller (19). The second gear (13) is fixedly installed at one end of the shaft (14). The vertical rod (15) is fixedly installed on the side end of the heat dissipation fin (16).

3. The terahertz-wave generator of claim 2, wherein the carbon nanotube-graphene heterostructure cold cathode is formed by a process comprising: forming a graphene layer on a substrate; forming a carbon nanotube layer on the graphene layer; and forming a gate electrode on the carbon nanotube layer. The cleaning device (8) includes a push plate (20), a displacement crossbeam (21) and a first connecting rope (22). The first connecting rope (22) is symmetrically fixedly installed at the top of the displacement crossbeam (21), and the push plate (20) is equidistantly fixedly installed on the inner side of the displacement crossbeam (21).

4. The terahertz-wave generator of claim 3, wherein the carbon nanotube-graphene heterostructure cold cathode is formed by a process comprising: forming a graphene layer on a substrate; forming a carbon nanotube layer on the graphene layer; and forming a gate electrode on the carbon nanotube layer. The diversion device (9) includes a second flow guiding cavity (23) and an air guiding cavity (24), wherein the second flow guiding cavity (23) is symmetrically fixedly installed at the bottom end of the air guiding cavity (24).

5. The terahertz-wave generator of claim 4, wherein the carbon nanotube-graphene heterostructure cold cathode is formed by a process comprising: forming a graphene layer on a substrate; forming a carbon nanotube layer on the graphene layer; and forming a gate electrode on the carbon nanotube layer. The positioning device (10) comprises a limiting frame (25), a guide rod (26), a first spring (27), a supporting top plate (28), a rack (29), a wire wheel (30), a second connecting rope (31), a third gear (32), a photoelectric sensor (33), a bottom plate (34), a pushing rod (35), a limiting rod (36) and a second spring (37), the wire wheel (30) is symmetrically rotatably installed at the top front end of the rack (29), the third gear (32) is fixedly installed at the rear end center of the wire wheel (30), the second connecting rope (31) is fixedly installed on the outer ring of the wire wheel (30), the rack (29) is symmetrically and slidingly inserted into the inner front end of the supporting top plate (28), and the rack (29) is located at the side end of the third gear (32), the guide rod (26) and the first spring (27) are symmetrically and fixedly installed on the two sides of the supporting top plate (28), and the guide rod (26) is located on the inner side of the first spring (27), the photoelectric sensor (33) is fixedly installed at the top rear end of the supporting top plate (28), the bottom plate (34) is fixedly installed at the inner rear end of the supporting top plate (28), and the bottom plate (34) is located below the photoelectric sensor (33), the limiting rod (36) is symmetrically and slidingly inserted into the front end of the bottom plate (34), the limiting frame (25) is fixedly installed at the front end of the guide rod (26), the second spring (37) is fixedly installed between the bottom plate (34) and the limiting frame (25), and the pushing rod (35) is fixedly installed at the rear end center of the limiting frame (25).

6. The terahertz-wave generator of claim 5, wherein the carbon nanotube-graphene heterostructure cold cathode is formed by a process comprising: forming a graphene layer on a substrate; forming a carbon nanotube layer on the graphene layer; and forming a gate electrode on the carbon nanotube layer. The matching plate (6) is slidingly installed at the inner side end of the supporting base plate (11), the connecting base plate (18) is slidingly sleeved on the guide rod (26), one end of the first spring (27) away from the supporting top plate (28) is connected with the connecting base plate (18), the first gear (12) is engaged with the second gear (13), the top end of the first connecting rope (22) is connected with the shaft rod (14), the displacement cross frame (21) is slidingly sleeved on the outer ring of the vertical rod (15), the air guide cavity (24) is fixedly installed at the top end of the supporting top plate (28), the supporting top plate (28) is fixedly installed at the side end top of the supporting base plate (11), one end of the second connecting rope (31) away from the third gear (32) is connected with the connecting base plate (18), and the rack (29) is engaged with the third gear (32).

7. The terahertz-wave generator of claim 6, wherein the carbon nanotube-graphene heterostructure cold cathode is formed by a process comprising: forming a graphene layer on a substrate; forming a carbon nanotube layer on the graphene layer; and forming a gate electrode on the carbon nanotube layer. The clamping keys are fixedly installed on the two sides of the matching plate (6), the clamping grooves are symmetrically formed in the inner side of the supporting base plate (11), the top end of the connecting rod (5) is arranged in a 45° inclination, and the limiting groove is formed in the outer ring of the connecting rod (5).

8. The terahertz-wave generator of claim 7, wherein the carbon nanotube-graphene heterostructure cold cathode is formed by a process comprising: forming a graphene layer on a substrate; forming a carbon nanotube layer on the graphene layer; and forming a gate electrode on the carbon nanotube layer. The teeth on the first gear (12) are distributed at an angle of 270°, the transmission ratio of the first gear (12) to the second gear (13) is 1:10, the inner bottom end of the first air guide cavity (17) and the second air guide cavity (23) is provided with an inclined plate, the first air guide cavity (17) is vertically aligned with the impeller (19), and the inner part of the push plate (20) is arranged in a hollow state.

9. The terahertz-wave generator of claim 8, wherein the carbon nanotube-graphene heterostructure cold cathode is formed by a process comprising: forming a graphene layer on a substrate; forming a carbon nanotube layer on the graphene layer; and forming a gate electrode on the carbon nanotube layer. The inner top end of the air guide cavity (24) is arranged at an inclination of 45°, the air guide cavity (24) is communicated with the second flow guide cavity (23), the inside of the support top plate (28) is provided with through holes on both sides, the bottom end of the air guide cavity (24) is connected with the through holes, the photoelectric sensor (33) is electrically connected with the heat dissipation fan (3), the inside of the support top plate (28) is symmetrically provided with circular holes, and the connecting rod (5) is vertically aligned with the circular holes.

10. The terahertz-wave generator of claim 9, wherein the carbon nanotube-graphene heterostructure cold cathode is formed by a process comprising: forming a graphene layer on a substrate; forming a carbon nanotube layer on the graphene layer; and forming a gate electrode on the carbon nanotube layer. The heat dissipation fan (3) further comprises a filter screen (38) and a communication cavity (39), the communication cavity (39) is fixedly installed at the top end of the heat dissipation fan (3), and the filter screen (38) is fixedly installed at the inner rear end of the communication cavity (39).

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