Hollowed-out ion selective electrode based on dual-electrode structure

Abstract

The utility model provides a hollow-out type ion selective electrode based on a double-electrode structure, which comprises a substrate, a front conductive circuit and an electrode loading area are arranged on the front surface of the substrate, and the electrode loading area comprises a plurality of electrode layers and first hollow-out holes penetrating through the substrate; a plurality of electrode layers are adjacently arranged on one side of the first hollow hole, and the first electrode layer is connected with the front conductive circuit; the back surface of the substrate is provided with a back surface conductive circuit, a selective electrode patch and a conductive adhesive tape, and the front surface conductive circuit is connected with the back surface conductive circuit; the selective electrode patch is tightly attached to the substrate and completely covers the first hollow hole, the conductive adhesive tape is arranged on the selective electrode patch, and the selective electrode patch is fixed to the back face of the substrate and is in contact conduction with the back face conductive circuit. According to the utility model, the detection performance of the electrode is ensured, the electrode is more flexible, and the processing and use cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of electrochemical sensors and relates to a hollow ion selective electrode based on a double-electrode structure. Background Art

[0002] Electrodes are the most important sensitive components of electrochemical sensors. They are usually two-electrode or three-electrode structures, where the two-electrode structure includes a working electrode and a reference electrode.

[0003] The working electrode modification layer of existing portable electrodes is fixed and cannot be replaced according to the detection target. Therefore, it may cause waste during use and cause some inconvenience in the specific use of the electrode. At the same time, modifying different modification layers on the electrode surface also brings difficulties to the electrode repair and processing. The electrode processing cost is high and there are also some inconveniences in use.

[0004] All existing electrode technical solutions propose to separate the key working electrode modification layer and perform subsequent gluing and installation according to the requirements of the detection molecules. However, there are still tiny gaps in the later installed structure. When the detection liquid droplets are added to the electrode modification hole position and react with the electrode modification layer in contact, the tiny gaps between the electrode modification layer and the back of the substrate cause the electrode detection area to change and become unable to be fixed, thereby greatly affecting the stability and accuracy of the detection data; in order to transmit the electrical signal generated by the electrode patch, a ring-shaped conductive structure is set in the contact area between the electrode patch and the electrode substrate, and the electrical signal is transmitted to the electrode pin by the ring structure. The effect of this ring structure in conducting electricity and transmitting signals is also not good, which affects the sensitivity of the electrode.

[0005] In order to further overcome the above problems, this patent aims to provide a hollow hole electrode that can be freely assembled with selective electrode patches according to the requirements of the detection object, and the area of ​​the electrode detection area is fixed to ensure the accuracy and stability of the detection. Utility Model Content

[0006] In summary, the present invention provides a hollow ion-selective electrode based on a dual-electrode structure, which can ensure the electrode detection performance while being more flexible, reducing processing and use costs, and opening up broader application prospects for microelectrodes.

[0007] The purpose of the utility model is to provide a hollow ion-selective electrode based on a dual-electrode structure, comprising a substrate, a front conductive circuit and an electrode loading area are arranged on the front side of the substrate, the electrode loading area includes a plurality of electrodes and a first hollow hole running through the substrate; a plurality of the electrodes are arranged on one side of the first hollow hole, and the electrodes are connected to the front conductive circuit; a back conductive circuit, a selective electrode patch and a conductive tape are arranged on the back side of the substrate, and the front conductive circuit is connected to the back conductive circuit; the selective electrode patch is tightly attached to the substrate and completely covers the first hollow hole, and the conductive tape is arranged on the selective electrode patch, fixing the selective electrode patch to the back side of the substrate and contacting and conducting with the back conductive circuit.

[0008] In one embodiment, the front conductive circuit partially overlaps with the back conductive circuit in the projection direction, and the front conductive circuit is provided with a plurality of conductive holes penetrating the substrate to connect the front conductive circuit with the back conductive circuit.

[0009] In one embodiment, the electrode loading area includes a first electrode layer and a fourth electrode layer, and the back conductive circuit includes a second electrode layer, a second circuit, and a second pin that are sequentially connected.

[0010] In one embodiment, the electrode loading area includes a first electrode layer, a second electrode layer, a third electrode layer, and a fourth electrode layer. The upper ends of the third electrode layer and the fourth electrode layer are provided with interdigitated strips, and the interdigitated strips are arranged in an equidistant and staggered manner in a comb-like shape to form an interdigitated structure.

[0011] In one embodiment, an insulating double-sided tape is further included, and the insulating double-sided tape is attached between the selective electrode patch and the substrate. The insulating double-sided tape is provided with a second hollow hole in the projection direction of the first hollow hole.

[0012] In one embodiment, the front conductive circuit includes a first circuit, a second circuit, a third circuit and a fourth circuit that are independent of each other, the first circuit is connected to the first electrode layer, the second circuit is connected to the second electrode layer, the third circuit is connected to the third electrode layer, and the fourth circuit is connected to the fourth electrode layer.

[0013] In one embodiment, a first pin, a second pin, a third pin and a fourth pin are further provided on the front surface of the substrate, and are connected to the first circuit, the second circuit, the third circuit and the fourth circuit respectively.

[0014] In one embodiment, the second hollow hole on the insulating double-sided tape is concentrically arranged with the first hollow hole.

[0015] In one embodiment, the conductive tape completely covers the selective electrode patch and the conductive hole.

[0016] In one embodiment, the material of the selective electrode patch includes at least one or more of carbon and metal, and the metal material includes gold, silver, platinum, bismuth, chromium, copper, and nickel.

[0017] The beneficial effects of the utility model are:

[0018] (1) The utility model sets up a dual-electrode structure on the same plane, digs a hole in the detection core area to form a first hollow hole, and splits the working electrode into components, which are installed later as independent electrode patches. In order to avoid the electrode patch directly contacting the back substrate to produce a tiny gap, which in turn causes the detection liquid to overflow and the electrode reaction area to change and affect the detection accuracy, an insulating double-sided tape is used to fix the inside and fill the gap, and then a conductive tape is used to fix the outside for a second time to realize the transmission of electrical signals at the same time, thereby ensuring the sensitivity and accuracy of the electrode and solving the stability problem of the patch electrode.

[0019] (2) The utility model connects the back conductor line and the front conductive line through the conductive hole of the conductive substrate, and transmits the electrochemical reaction signal generated by the electrode patch in the first hollow hole area to the electrode pin through this path, and then transmits it out, while ensuring the sensitivity and accuracy of the electrode, greatly reducing the coplanar electrode area, providing more conductive line layout solutions, greatly reducing the difficulty and cost of electrode electroplating processing, avoiding secondary processing, optimizing the function and structural design of the standard electrode, and expanding the application field of the electrode.

[0020] (3) The present invention achieves the purpose of selecting different electrode modification layers according to the characteristics of the detection target by setting the core detection area of ​​the working electrode as an independent electrode patch that can be freely replaced and selected. At the same time, the material and modification layer of the independent electrode patch serving as the core detection layer can be freely replaced and used immediately after replacement, making the selection of electrode patches more diverse and achieving the purpose of detecting a variety of different biochemical molecules by replacing the electrode patch. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described with reference to the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0022] Figure 1 This is a front view of Example 1 of the present invention. Figure 1 ;

[0023] Figure 2 This is a front view of Example 1 of the present invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the back of Example 1 of the present utility model;

[0025] Figure 4 This is a front view of Example 2 of the present utility model;

[0026] Figure 5 This is a schematic diagram of the back of Example 2 of the present utility model;

[0027] Figure 6 This is a front view of Example 3 of the present utility model;

[0028] Figure 7 This is a schematic diagram of the back of Example 3 of the present utility model;

[0029] Figure 8 This is a schematic diagram of the side structure of a hollow ion-selective electrode based on a double-electrode structure of the utility model.

[0030] Legend:

[0031] 1. Electrode loading area; 12. First electrode layer; 13. First hollow hole; 14. Second electrode layer; 15. Third electrode layer; 16-Fourth electrode layer; 2. Front conductive circuit; 22. First circuit; 23. Second circuit; 24. Through hole; 25. Third circuit; 26. Fourth circuit; 32. First pin; 33. Second pin; 34. Third pin; 35. Fourth pin; 4. Back conductive circuit; 41. Insulating double-sided tape; 42. Selective electrode patch; 43. Conductive tape. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the following specific embodiments and the accompanying drawings.

[0033] The following is attached with the instruction manual Figure 1 -Attached Figure 5 Several examples are given to describe exemplary implementations of the present application. It should be noted that the following application scenarios are only provided to facilitate understanding of the spirit and principles of the present application, and the implementations of the present application are not limited in this respect. On the contrary, the implementations of the present application can be applied to any applicable scenario.

[0034] Example 1

[0035] As attached Figures 1 to 6The figure shows a hollow ion-selective electrode based on a dual-electrode structure provided by the present invention. It includes a PET plate electrode substrate with electrode dimensions of 12x35mm and a thickness of 0.35mm. The substrate can be made of a flexible polymer material, or conventional electrode materials such as epoxy resin, ceramic, silicon, and glass.

[0036] The electrode loading area 1 includes a first electrode layer 12, a second electrode layer 14, a third electrode layer 15, a fourth electrode layer 16 and a first hollow hole 13 that passes through the substrate; the first electrode layer 12, the second electrode layer 14, the third electrode layer 15 and the fourth electrode layer 16 are arranged on one side of the first hollow hole 13, and the first electrode layer 12 is connected to the front conductive line 2; the upper ends of the third electrode layer 15 and the fourth electrode layer 16 are provided with interdigitated strips, and the interdigitated strips are arranged in an equidistant and staggered manner in a comb-like shape to form an interdigitated structure; the interdigitated structure between the third electrode layer 15 and the fourth electrode layer 16 constitutes a calibration area.

[0037] A back conductive circuit 4, a selective electrode patch 42 and a conductive tape 43 are provided on the back side of the substrate, and the front conductive circuit 2 is connected to the back conductive circuit 4; the selective electrode patch 42 is tightly attached to the substrate and completely covers the first hollow hole 13, and the conductive tape 43 is provided on the selective electrode patch 42, fixing the selective electrode patch 42 to the back side of the substrate and contacting and conducting with the back conductive circuit 4.

[0038] It is understandable that the distance between each electrode on the substrate is minimized to eliminate concentration polarization and improve electrode sensitivity. This configuration greatly reduces the distance between the working electrode and the counter electrode, promoting the miniaturization of the coplanar electrodes and improving sensitivity.

[0039] In one embodiment, the projections of the front conductive circuit 2 and the back conductive circuit 4 on the substrate overlap, and the front conductive circuit 2 is provided with a plurality of conductive holes 24 penetrating the substrate to connect the front conductive circuit 2 with the back conductive circuit 4.

[0040] It can be understood that the conductive holes 24 and the conductive circuits are generally filled with a metal layer, which can connect the conductive circuit metal layers on the front and back sides of the substrate. The number of conductive holes 24 is set to one or more, usually three, which can ensure that the front and back sides of the substrate are conductively connected and the electrical signal transmission is normal.

[0041] In one embodiment, an insulating double-sided tape 41 is further included. The insulating double-sided tape 41 is attached between the selective electrode patch 42 and the substrate. The insulating double-sided tape 41 has a second hollow hole in the projection direction of the first hollow hole 13 .

[0042] It is understandable that, in this embodiment, preferably, the size and shape of the second hollow hole are the same as those of the first hollow hole 13, but the specific shape and size of the second hollow hole are not limited. The electrode patch is fixed on the back of the substrate. When in use, the liquid to be tested is added to the position of the first hollow hole 13 on the front. That is, the part of the electrode patch corresponding to the position of the first hollow hole 13 is the electrode detection area, and the electrochemical reaction area is also calculated based on this. However, when the electrode patch is in direct contact with the back of the substrate, it is impossible to fit completely tightly. There will always be tiny gaps between the materials. The liquid to be tested may overflow these tiny gaps, which will cause the area of ​​the electrode detection area to change, affecting the electrode detection results. By setting the insulating double-sided tape 41 between the substrate and the selective electrode patch 42, the selective electrode patch 42 is prevented from directly contacting the substrate, so that the periphery of the first hollow hole 13 remains flat, and the fluid will not leak through the gaps on the substrate during detection, thereby improving the product detection accuracy.

[0043] In one embodiment, the front conductive circuit 2 includes a first circuit 22 and a second circuit 23 that are independent of each other, and the first circuit 22 is connected to the first electrode layer 12 .

[0044] It can be understood that in the embodiment of the present invention, the second circuit 23 of the electrode is not connected to the first hollow hole 13, that is, the second circuit 23 on the front of the electrode is not connected to the working electrode position, but is connected to the back conductive circuit 4 on the back of the electrode base through the conductive hole 24 set in the second circuit 23, and then connected to the electrode sheet subsequently loaded at the position of the first hollow hole 13 and transmits electrical signals. This not only reduces the volume of the electrode and makes the layout of the circuits on the electrode surface more concise, but also makes the transmission of electrical signals smoother. It is also in line with the design concept of the present invention to load the working electrode separately as an electrode sheet, avoiding the disadvantage that the loaded electrode sheet affects the transmission of electrical signals due to poor contact and other reasons.

[0045] In one embodiment, one or more vias 24 are provided on the second circuit 23 , and the second circuit 23 is interconnected with the back conductive circuit 4 through the vias 24 .

[0046] In one embodiment, the front side of the substrate is further provided with a first pin 32, a second pin 33, a third pin 34, and a fourth pin 35, which are respectively connected to the first circuit 22, the second circuit 23, the third circuit 24, and the fourth circuit 25. The surfaces of the front conductive circuit 2, the electrode pins, the electrode detection layer, and the back conductive circuit 4 are modified with a metal layer as a base metal, and the metal type includes silver.

[0047] It can be understood that the above electrode pins are arranged in parallel and equidistantly, and the entire electrode size is set to match the USB size. The metal area size and distance of the three pins can also be adjusted as needed to facilitate the transmission of electrical signals.

[0048] In one embodiment, the conductive tape 43 completely covers the selective electrode patch 42 and the conductive hole 24 .

[0049] It can be understood that in this embodiment, there is no specific restriction on the shape of the conductive tape 43. By setting the conductive tape 43 to connect the selective electrode patch 42 and the second circuit 23 on the back of the substrate, the detection of the droplet to be tested can be achieved. In addition, the conductive tape 43 can further fix the selective electrode patch 42 on the substrate to reduce the gap, thereby improving the detection accuracy.

[0050] In one embodiment, the material of the selective electrode patch 42 includes at least one or more of carbon and metal, and the metal material includes gold, silver, platinum, bismuth, chromium, copper, and nickel.

[0051] The selective electrode patch 42 selects a gold electrode sheet with an overall thickness of 0.01 to 0.02 mm and an overall radius of 2 mm. The shape can be circular or rectangular, and can also be freely set. Its area is larger than the area of ​​the first hollow hole 13 and can completely cover it. In order to save costs, the gold electrode sheet uses a copper base, which is polished and plated with bright copper, then silver-plated, and finally gold-plated. Only the side in contact with the base layer can be processed on one side.

[0052] For ease of use, the conductive circuit 2 on the front side of the substrate can be partially coated with ink, and then a second layer of ink can be coated on the periphery of the electrode loading area 1, leaving only the electrode detection layer and the first hollow hole 13 and the area where the electrode pins are located exposed. The thickness of each layer of ink is 10 to 20 μm.

[0053] It is understandable that conventional coplanar electrodes need to be modified with different metals or modified layers in the working electrode and reference electrode areas respectively, but this is difficult to achieve in actual processing. The different orders and processes of electrode processing may affect the processing of other electrodes, especially for working electrodes modified with core detection layers. The process effect may be affected by other electrodes or more cumbersome processes may be required to avoid influencing factors. This application separates the working electrode into a component, and the electrode patch can be processed or selected separately. The process is simpler and more convenient, and more types of modification processing can be performed. More targets can be detected, and more targeted selections can be made according to different targets, which greatly expands the electrode detection range and detection methods.

[0054] Specifically, in order to tightly fix the electrode patch on the back of the substrate, the utility model designs a multi-layer structure, which includes an insulating double-sided tape 41, an electrode patch and a conductive tape 43. The insulating double-sided tape 41 is attached to the back of the substrate, and a hole identical to the first hollow hole 13 on the substrate is opened at the same position. After tearing off the upper backing paper on the other side, the electrode patch can be pasted and fixed. Because the double-sided tape material is insulating, it does not affect the reaction and signal transmission generated on the electrode patch. Subsequently, the conductive tape 43 is used to cover the electrode patch, and the electrode patch is fixed to the back of the substrate for the second time, and connected to the back conductive circuit 4, thereby realizing the transmission of electrical signals from the electrode patch to the conductive tape 43, the back conductive circuit 4 and the through hole 24 to the front second circuit 23 and the second pin 33.

[0055] It can be understood that the electrode patch is fixed on the back of the substrate. When the hollow electrode is used, the liquid to be tested is added to the position of the first hollow hole 13 on the front, that is, the part of the electrode patch corresponding to the position of the first hollow hole 13 is the electrode detection area, and the electrochemical reaction area is also calculated based on this. However, when the electrode patch is in direct contact with the back of the substrate, it is impossible for the electrode patch to fit completely tightly. There will always be tiny gaps between the materials. The liquid to be tested may overflow these tiny gaps, which will cause the area of ​​the electrode detection area to change, affecting the electrode detection results.

[0056] The metal part can be appropriately added to the contact area between the back conductive circuit 4 and the conductive tape 43, so as to maximize the contact area between the conductive circuit and the conductive tape 43, thereby increasing the conductive area, making the conductive effect better and the electrical signal transmission effect better.

[0057] In an optional embodiment, a raised dam is provided on the periphery of the first hollow hole 13 so that the inner side of the raised dam can form a detection area for electrochemical detection. When the test liquid is dripped into the detection area, it can effectively prevent the test liquid from overflowing the electrode structure.

[0058] When the present invention is used, the pin end is first connected to the USB standard interface of the electrochemical workstation, and then solution, blood or biochemical tissue fluid is dripped into the first hollow hole 13 to perform electrochemical detection. The operation is simple, fast and convenient.

[0059] The present invention uses double-sided tape to fix the electrode patch to the greatest extent, fill the gaps, and minimize the tiny gaps generated by the electrode patch and the back substrate surface, thereby avoiding changes in the area of ​​the electrode detection area and the inability to fix it, which greatly affects the stability and accuracy of the detection data. The subsequent secondary fixation with conductive tape 43 further prevents the electrode patch from being moved by external forces, covers and protects the electrode patch, and at the same time expands the contact area between the conductive tape 43 and the electrode patch, and the contact area between the conductive tape 43 and the back conductive circuit 4 as much as possible, thereby connecting the electrode patch to the back conductive circuit 4, facilitating signal transmission, and achieving excellent results, making the electrode performance more sensitive and stable.

[0060] Example 2

[0061] In this embodiment, the front side of the substrate is provided with only the first electrode layer 12, the fourth electrode layer 16, and the first hollow hole 13. Furthermore, the back side of the substrate is provided with a second electrode layer 14, a second circuit, and a second pin connected thereto. The second electrode layer is connected to the selective electrode patch via conductive tape. The difference from Example 1 is that the front and back electrodes are not connected via conductive holes. This prevents interference between the electrodes. Specifically, the first electrode layer 12 and the fourth electrode layer 16 are respectively provided on either side of the first hollow hole, and the first circuit, fourth circuit, first pin, and fourth pin connected thereto are arranged in parallel.

[0062] Example 3

[0063] The difference between this embodiment and embodiment 2 is that the first electrode layer 12 and the fourth electrode layer 16 are disposed on both sides of the first hollow hole in a mirror-symmetrical manner.

[0064] Example 4

[0065] The difference between this embodiment and embodiment 1 is that in this embodiment, the selective electrode patch 42 is a silver electrode sheet, which can be circular or rectangular, or can be freely set. Its area is larger than the area of ​​the first hollow hole 13 and can completely cover it.

[0066] For ease of use, the conductive circuit 2 on the front side of the substrate can be partially coated with ink, and then a second layer of ink can be coated on the periphery of the electrode loading area 1, leaving only the electrode detection layer and the first hollow hole 13 and the area where the electrode pins are located exposed. The thickness of each layer of ink is 10 to 20 μm.

[0067] Example 5

[0068] The difference between this embodiment and embodiment 1 is that in this embodiment, the selective electrode patch 42 is a platinum electrode sheet, which can be circular or rectangular, or can be freely set, and its area is larger than the area of ​​the first hollow hole 13, and can completely cover it.

[0069] Example 6

[0070] The difference between this embodiment and embodiment 1 is that, in this embodiment, the selective electrode patch 42 selects a bismuth electrode sheet, and specifically, a bismuth film can be modified on the surface of the reaction surface of the electrode sheet. The shape of the electrode sheet can be circular or rectangular, and can also be freely set. Its area is larger than the area of ​​the first hollow hole 13 and can completely cover it.

[0071] Example 7

[0072] The difference between this embodiment and embodiment 1 is that, in this embodiment, the selective electrode patch 42 selects a carbon electrode sheet, the material of which can be carbon-related materials including graphene, and the shape can be circular or rectangular, or can be freely set. Its area is larger than the area of ​​the first hollow hole 13 and can completely cover it.

[0073] Example 8

[0074] The difference between this embodiment and embodiment 1 is that, in this embodiment, the selective electrode patch 42 selects a chromium electrode sheet. Specifically, a chromium film can be modified on the surface of the reaction surface of the electrode sheet. The shape of the electrode sheet can be circular or rectangular, and can also be freely set. Its area is larger than the area of ​​the first hollow hole 13 and can completely cover it.

[0075] Example 9

[0076] The difference between this embodiment and embodiment 1 is that, in this embodiment, the selective electrode patch 42 is based on a gold electrode sheet, which is modified with an active enzyme substance. The electrode sheet in contact with the electrode substrate can be modified on one side. The shape of the substrate can be circular or rectangular, and can also be freely set. Its area is larger than the area of ​​the first hollow hole 13 and can completely cover it.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

[0078] In addition, it should be understood that although this specification describes the embodiments, not each embodiment contains only one independent technical solution. This description is for clarity only. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. Technical details not described in detail in this utility model can be implemented by any existing technology in the art. In particular, all technical features not described in detail in this utility model can be implemented by any existing technology.

Claims

1. A hollow ion-selective electrode based on a dual-electrode structure, comprising a substrate, characterized in that: A front conductive circuit (2) and an electrode loading area (1) are provided on the front surface of the substrate, wherein the electrode loading area (1) includes a plurality of electrodes and a first hollow hole (13) penetrating the substrate; the plurality of electrodes are provided on one side of the first hollow hole (13), and the electrodes are connected to the front conductive circuit (2); A back conductive circuit (4), a selective electrode patch (42) and a conductive tape (43) are provided on the back side of the substrate; the front conductive circuit (2) is connected to the back conductive circuit (4); the selective electrode patch (42) is tightly attached to the substrate and completely covers the first hollow hole (13); the conductive tape (43) is provided on the selective electrode patch (42), fixes the selective electrode patch (42) to the back side of the substrate, and is in contact and conduction with the back conductive circuit (4).

2. The hollow ion selective electrode based on a dual-electrode structure according to claim 1, characterized in that: The front conductive circuit (2) and the back conductive circuit (4) partially overlap in the projection direction, and the front conductive circuit (2) is provided with a plurality of conductive holes (24) penetrating the substrate to connect the front conductive circuit (2) and the back conductive circuit (4).

3. The hollow ion selective electrode based on a dual-electrode structure according to claim 1, characterized in that: The electrode loading area includes a first electrode layer (12) and a fourth electrode layer (16), and the back conductive circuit includes a second electrode layer, a second circuit and a second pin connected in sequence.

4. The hollow ion selective electrode based on a dual-electrode structure according to claim 1, characterized in that: The electrode loading area comprises a first electrode layer (12), a second electrode layer (14), a third electrode layer (15), and a fourth electrode layer (16); the upper ends of the third electrode layer (15) and the fourth electrode layer (16) are provided with interdigitated strips, and the interdigitated strips are arranged in an equidistant and staggered manner in a comb-like manner to form an interdigitated structure.

5. The hollow ion selective electrode based on a dual-electrode structure according to claim 1, characterized in that: It also includes an insulating double-sided tape (41), which is attached between the selective electrode patch (42) and the substrate, and the insulating double-sided tape (41) is provided with a second hollow hole in the projection direction of the first hollow hole (13).

6. The hollow ion selective electrode based on a dual-electrode structure according to claim 4, characterized in that: The front conductive line comprises a first line (22), a second line (23), a third line (25) and a fourth line (26) which are independent of each other; the first line (22) is connected to the first electrode layer (12); the second line (23) is connected to the second electrode layer (14); the third line (25) is connected to the third electrode layer (15); and the fourth line (26) is connected to the fourth electrode layer (16).

7. The hollow ion selective electrode based on a dual-electrode structure according to claim 6, characterized in that: The front side of the substrate is also provided with a first pin (32), a second pin (33), a third pin (34) and a fourth pin (35), which are respectively connected to the first circuit (22), the second circuit (23), the third circuit (25) and the fourth circuit (26).

8. The hollow ion selective electrode based on a dual-electrode structure according to claim 5, characterized in that: The second hollow hole on the insulating double-sided tape (41) is arranged concentrically with the first hollow hole (13).

9. The hollow ion selective electrode based on a dual-electrode structure according to claim 2, characterized in that: The conductive tape (43) completely covers the selective electrode patch (42) and the conductive hole (24).

10. The hollow ion selective electrode based on a dual-electrode structure according to claim 1, characterized in that: The material of the selective electrode patch (42) is selected from carbon and metal, and the metal is selected from one of gold, silver, platinum, bismuth, chromium, copper and nickel.

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