Ion detection module

Abstract

The utility model provides an ion detection module, a single channel ion detection module is prepared based on the microfluidic technology, the ion detection module comprises a cavity and a bottom plate from top to bottom, the cavity and the bottom plate are connected in a sealed mode, an annular counter electrode and a working electrode are arranged at the bottom of a test cavity, and the working electrode is arranged at the bottom of the test cavity. The surfaces of the electrodes are electroplated with gold layers, so that the test sensitivity and accuracy are improved; a reference cavity, a liquid complexing part cavity and a test cavity are vertically stacked around the same coaxial shaft, the reference cavity is filled with electrolyte, and the liquid complexing part cavity is electrically connected with test liquid, so that the process of feeding, storing and emptying a sample to be tested can be realized, and meanwhile, the test cavity, the liquid complexing part and the reference cavity are integrated along the vertical direction; the portable heavy metal detection is easy to realize.

Description

TECHNICAL FIELD

[0001] The utility model belongs to environmental detection technical field relates to an ion detection module. BACKGROUND

[0002] With the development of social industry, the environmental pollution problem is more and serious, and heavy metal pollution is the most important and harmful one, and the resources closely related to human development such as soil and water will be seriously polluted by heavy metal ions. In addition, in the field of food safety, heavy metal ions are also one of the main detection objects, and timely and effective detection of heavy metal ions will effectively ensure the life and health safety of the people.

[0003] At present, many methods have been developed for heavy metal detection, which are different in principle, detection sensitivity, instrument cost and volume, applicable range, etc. With the development and maturity of modern microelectronics and microprocessing, ion-sensitive sensors for detecting multiple ions in solution mainly develop towards miniaturization, automation and integration. In order to further improve the detection performance of the sensor, different nanomaterials and sensitive films are used to modify the surface of the sensor. The development of micro ion-sensitive sensor elements is easy to realize portable heavy metal detection, which has important significance for timely feedback and control of environmental pollutant information.

[0004] Therefore, it is necessary to provide an ion detection module to improve the integration, sensitivity and portability of the micro sensor.

[0005] It should be noted that the above introduction to the technical background is only to facilitate the clear and complete description of the technical scheme of the present application, and to facilitate the understanding of those skilled in the art. The above technical scheme cannot be considered as known to those skilled in the art only because it is described in the background section of the present application. CONTENT OF THE UTILITY MODEL

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present utility model is to provide an ion detection module to solve the problem of how to improve the sensitivity, integration and portability of the sensor.

[0007] To achieve the above object and other related objects, the utility model provides an ion detection module, comprising:

[0008] A cavity structure comprises a cavity and a base, the cavity and the base are bonded, and the cavity structure comprises a reference cavity, a liquid complex cavity, a test cavity, a sample inlet channel and a sample outlet channel, wherein the reference cavity, the liquid complex cavity and the test cavity are coaxially stacked in sequence in the vertical direction; the reference cavity provides accommodation space for electrolyte; the sample inlet channel and the sample outlet channel are both in communication with the test cavity to provide a detection path for detection liquid; the liquid complex cavity provides accommodation space for liquid complex and isolates the electrolyte and the detection liquid;

[0009] An electrode pair is located in the test cavity, and the electrode pair comprises a working electrode and a counter electrode.

[0010] A reference electrode is located in the reference cavity.

[0011] Optionally, the surface of the electrode pair has a gold layer.

[0012] Optionally, the height ratio of the reference cavity, the liquid complex cavity and the test cavity is (2-3):1:(1.5-2); the diameter ratio of the reference cavity, the liquid complex cavity and the test cavity is (3-4):1:(2-3).

[0013] Optionally, the ion detection module further comprises a socket member and a socket slot in the cavity, the socket slot is in communication with the reference cavity, and the socket member is arranged correspondingly with the socket slot, the socket member is provided with a socket in the shape of an X-shaped funnel or a V-shaped funnel.

[0014] Optionally, the detection path is in the shape of V or S.

[0015] Optionally, the cavity comprises one of a PMMA cavity, a polycarbonate cavity and a polyester cavity, and the base comprises one of a PMMA base, a polycarbonate base and a polyester base.

[0016] Optionally, the counter electrode is in the shape of a ring and is distributed on the periphery of the working electrode.

[0017] As described above, the utility model provides a kind of ion detection module, single-channel ion detection module is prepared based on microfluidic technology, the ion detection module includes cavity and bottom plate from top to bottom, and the cavity and the bottom plate are sealed connection, through the annular counter electrode and working electrode of test cavity bottom part are set, and electrode surface all pass through gold layer of electroplating, improve test sensitivity and accuracy;By setting reference cavity, liquid complex cavity, test cavity surrounds the same coaxial vertical stacking, the reference cavity is filled with electrolyte, and realizes electrical connection by liquid complex cavity and test liquid, can realize the sample of sample to be measured, storage, emptying this process, simultaneously make test cavity, liquid complex, reference cavity is integrated to an organic whole along vertical, easy to realize portable heavy metal detection. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is shown as three-dimensional structure schematic diagram of ion detection module in the utility model.

[0019] Figure 2 It is shown as Figure 1 explosion structure schematic diagram.

[0020] Figure 3 It is shown as the overhead structure schematic diagram of ion detection module bottom recess in the utility model.

[0021] Figure 4 It is shown as the side structure schematic diagram of ion detection module bottom recess in the utility model.

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 100 cavity structure

[0024] 110 cavity

[0025] 210 base

[0026] 240 recess

[0027] 241 central recess

[0028] 242 lead-out recess

[0029] 310 insertion slot

[0030] 320 reference cavity

[0031] 330 liquid complex cavity

[0032] 340 test cavity

[0033] 350 sample inlet channel

[0034] 351 sample inlet hole

[0035] 352 sample inlet flow channel

[0036] 360° Sample Display Channel

[0037] 361 Sample hole

[0038] 362 Sample outlet channel

[0039] 370 bolts

[0040] 380 connector

[0041] 400 FPC flexible board

[0042] 410 Working electrode

[0043] 411 First Lead

[0044] 420 pairs of electrodes

[0045] 421 Second lead

[0046] 430 Reference Electrode

[0047] 431 Third lead

[0048] 440 electrode pair Detailed Implementation

[0049] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0050] In the detailed description of the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged and not in proportion to the general scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0051] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0052] In the context of the present application, a structure in which a first feature is described as being "on" a second feature can include embodiments in which the first and second features are formed in direct contact, as well as embodiments in which additional features are formed between the first and second features such that the first and second features can not be in direct contact.

[0053] Need to explain, the embodiment provided in the figure only in a schematic way illustrates the basic idea of the utility model, so the figure shows only the components related to the utility model, not according to the component number, shape and size drawn when actually implemented, the type, quantity and proportion of each component in actual implementation can be a kind of arbitrary change, its component layout type can be more complex.

[0054] Embodiment one

[0055] Reference Figures 1-4 The embodiment provides an ion detection module, and the structure of the ion detection module is introduced and described below in combination with the accompanying drawings.

[0056] In the embodiment, the ion detection module includes:

[0057] The cavity structure 100 includes a cavity 110 and a base 210, the cavity 110 and the base 210 are bonded, and the cavity structure 100 includes a reference cavity 320, a liquid complex cavity 330, a test cavity 340, a sample inlet channel 350 and a sample outlet channel 360, wherein the reference cavity 320, the liquid complex cavity 330 and the test cavity 340 are coaxially stacked in sequence in the vertical direction; the reference cavity 320 provides accommodation space for electrolyte; the sample inlet channel 350 and the sample outlet channel 360 are both in communication with the test cavity 340 to provide a detection path for detection liquid (not labeled); the liquid complex cavity 330 provides accommodation space for a liquid complex and isolates the electrolyte and the detection liquid.

[0058] The electrode pair 440 is located in the test cavity 340, and the electrode pair 440 includes a working electrode 410 and a counter electrode 420.

[0059] The reference electrode 430 is located in the reference cavity 320.

[0060] As an example, in order to slow down the flow rate of the detection liquid, the sample inlet channel 350 includes a sample inlet hole 351 and a sample inlet flow channel 352, the sample outlet channel 360 includes a sample outlet hole 361 and a sample outlet flow channel 362, the sample inlet hole 351 and the sample inlet flow channel 352 are in communication, the sample outlet hole 361 and the sample outlet flow channel 362 are in communication, and the sample inlet channel 350, the test cavity 340 and the sample outlet channel 360 are in communication to provide a detection path for the detection liquid.

[0061] Further, in order to reduce the bubbles in the flowing mixing process of the detection solution and improve the accuracy of the test, the detection path is in V-shaped or S-shaped distribution, and the sample inlet channel 350 and the sample outlet channel 360 also have various options, which are usually connected to the opposite ends of the test chamber 340 respectively, so as to facilitate the smooth flow of the detection solution through the entire detection channel. The direction of the nozzle is usually designed as the normal or tangent direction of the edge of the test chamber 340, and other directions can also be selected according to actual needs.

[0062] As an example, referring to Figure 1 , the sample inlet channel 352 and the sample outlet channel 362 are located at the opposite ends of the test chamber 340, the detection path is in V-shaped distribution, and the opening direction is the normal direction of the edge of the test chamber 340. The detection solution flows smoothly and constantly in the detection channel, so that the reactants have sufficient time to deposit on the surface of the electrode pair 440 during the heavy metal ion detection process, and the heavy metal ions are reduced to metal and enriched on the working electrode 410.

[0063] As an example, on the premise of ensuring the sealing between the base 210 and the cavity 110, the sample inlet channel 352 and the sample outlet channel 362 can be located on the surface of the base 210, on the bottom surface of the test chamber 340, or on the interface position adjacent to the test chamber 340, so as to ensure that the detection solution can be sealed without leakage.

[0064] As an example, the height ratio of the reference chamber 320, the liquid complexing chamber 330 and the test chamber 340 is (2-3):1:(1.5-2). Specifically, when the height of the liquid complexing chamber 330 is 1, the height of the reference chamber 320 can be 2-3, such as 2, 2.3, 2.5, 2.8, 3, or any value within this range, and the height of the test chamber 340 can be 1.5-2, such as 1.5, 1.7, 1.8, 2, or any value within this range.

[0065] In the embodiment, the cross sections of the reference cavity 320, the liquid complexing cavity 330 and the test cavity 340 are circular, and the whole is a plurality of cylindrical cavities stacked in sequence and coaxially. In the embodiment, the coaxial is concentric, and the diameter ratio of the reference cavity 320, the liquid complexing cavity 330 and the test cavity 340 is (3-4):1:(2-3). Specifically, when the diameter of the liquid complexing cavity 330 is 1, the diameter of the reference cavity 320 can be 3-4, for example, 3, 3.3, 3.5, 3.8, 4 or any value in the range, and the height of the test cavity 340 can be 2-3, for example, 2, 2.4, 2.7, 3 or any value in the range. The cross sections of the reference cavity 320, the liquid complexing cavity 330 and the test cavity 340 of the utility model are not limited to the circular shape, and can also be designed as a rectangle, an ellipse, a saddle shape or other shapes in the vertical stacking of the cavities, of which the circular shape is the most commonly used.

[0066] In the embodiment, the ion detection module integrates the reference cavity 320, the liquid complexing cavity 330, the test cavity 340, the electrode pair 440 and the reference electrode 430 in the Z-axis direction, maximally reduces the occupied volume of the ion detection module in the X / Y direction, saves space, and is easy to realize portable heavy metal ion detection, which is of great significance for instant feedback and control of environmental pollution information.

[0067] For example, the liquid complexing part includes one of ceramic material, polymer material and semiconductor material; preferably, in the embodiment, the material of the liquid complexing part is porous ceramic material.

[0068] In the embodiment, in order to fill and protect the reference electrolyte and more conveniently support the reference electrode 430, the ion detection module is further provided with a socket piece 380 and a socket slot 310 in the cavity 110. The socket slot 310 communicates with the reference cavity 320, and the socket piece 380 is correspondingly arranged in the socket slot 310.

[0069] Further, referring to Figure 2 , the socket piece 380 is provided with an X-shaped or V-shaped funnel-shaped socket.

[0070] As an example, the overall shape of the cavity structure 110 is usually designed as a cuboid, and can also be designed as other shapes, as long as the inside is convenient for placing the detection channel; in order to facilitate the control of the flow of the internal detection liquid during the detection process, the cavity in the embodiment is made of transparent material, including one of PMMA cavity, polycarbonate cavity, polyester cavity, the base 210 is made of transparent material, including one of PMMA base 210, polycarbonate base 210, polyester base 210, in actual application, non-transparent material can also be selected according to actual needs.

[0071] As an example, refer to Figure 3 , the electrode pair 440 is located on the base 210 and corresponds to the bottom of the test cavity 340, and the counter electrode 420 is annularly distributed on the periphery of the working electrode 410, the working electrode 410 is provided with a first lead 411, and the counter electrode 420 is provided with a second lead 421.

[0072] Further, in order to make the ion detection module have higher space utilization and be more portable and miniaturized, in the embodiment, the first lead 411 and the second lead 421 are led out through the FPC flexible board 400, which enables the circuit connection of the electrode pair 440 to be wound, bent and folded according to the space requirement, thereby improving the flexibility of the ion detection module manufacturing. Of course, in some other embodiments, the first lead 411 and the second lead 421 can also be led out through other substrates to realize circuit connection.

[0073] Further, the FPC flexible board 400 can adopt polyimide film substrate or polyester film substrate; in order to make the ion detection module have mechanical stability, thermal stability and chemical stability in different detection environments, the FPC flexible board 400 preferably adopts polyimide film substrate. In some other embodiments, polyester film substrate can also be considered according to cost and insulation.

[0074] As an example, refer to Figure 4 In order to facilitate space saving and placement of the electrode pair 440, the base 210 can be provided with a groove 240, and the groove 240 includes a lead-out groove 242 for placing the FPC flexible board 400 and a central groove 241 corresponding to the test cavity 340, and the central groove 241 places the electrode pair 440. Of course, according to actual needs, the base 210 can also not be provided with the groove 240 to place the electrode pair 440.

[0075] Embodiment two

[0076] The embodiment provides a preparation method of an ion detection module, which is described below in combination with the specification Figures 1-4The method for manufacturing the ion detection module is further described.

[0077] First, a substrate material is provided, and a cavity structure 100 is prepared based on the substrate, the cavity structure 100 including a cavity 110 and a base 210, the cavity 110 and the base 210 being bonded, and the cavity structure 100 including a reference cavity 320, a liquid junction cavity 330, a test cavity 340, a sample inlet channel 350, and a sample outlet channel 360, wherein the reference cavity 320, the liquid junction cavity 330, and the test cavity 340 are coaxially stacked in sequence in the vertical direction; the reference cavity 320 provides accommodation space for electrolyte; the sample inlet channel 350 and the sample outlet channel 360 are both in communication with the test cavity 340 to provide a detection path for the detection liquid; and the liquid junction cavity 330 provides accommodation space for the liquid junction and isolates the electrolyte and the detection liquid.

[0078] Specifically, the cavity structure 100 can be prepared by using a 3D printing technology, which generally requires first designing and drawing a three-dimensional model of the cavity structure 100, then selecting a substrate material and a specific type of 3D printer, and printing according to the model to complete the processing of the cavity structure 100.

[0079] Further, the 3D printing technology can use a fused deposition modeling 3D printer, for example, using PMMA material, melting PMMA plastic at the printer nozzle, then preparing the cavity 110 by depositing plastic fibers, and finally performing heat treatment on the formed cavity 110 to smooth the rough structure, thereby completing the preparation of the cavity 110; similarly, the base 210 structure can also be prepared according to the above technology. In some other embodiments, the cavity 110 and the base 210 can also be prepared based on a stereolithography molding technology, which will not be described in detail here.

[0080] Further, in order to isolate the electrolyte and the detection liquid, the liquid junction cavity 330 provides accommodation space to place the liquid junction filled with liquid; preferably, the liquid junction material uses porous ceramic material.

[0081] Further, in order to facilitate filling and protecting the electrolyte and more conveniently supporting the reference electrode 430, a socket piece 380 is provided during the manufacturing of the ion detection module, and a socket groove 310 is arranged in the cavity 110, the socket groove 310 being in communication with the reference cavity 320, and the socket piece 380 being arranged correspondingly with the socket groove 310.

[0082] Secondly, an electrode pair 440 is prepared, which is located in the test cavity 340 and includes a working electrode 410 and a counter electrode 420, and a reference electrode 430 is prepared, which is located in the reference cavity 320.

[0083] Specifically, the counter electrode 420 is annularly distributed at the periphery of the working electrode 410, and the annular counter electrode 420 is formed on the FPC flexible plate 400, and the electrode pair 420 is led out through the FPC flexible plate 400 to the first lead 411 and the second lead 421.

[0084] As an example, in order to ensure that the electrode pair 440 is stable in current and reduce the polarization phenomenon on the surface of the electrode pair 440, in the embodiment, the surface of the electrode pair 440 is treated by electroplating a gold layer.

[0085] Specifically, the surface electroplating gold layer treatment is performed in a configured gold electroplating solution formula. In the embodiment, under the two-electrode system of the platinum counter electrode 420, the electroplating process parameters are as follows: current density 0.45-0.55 mA / cm 2 , such as 0.45 mA / cm 2 , 0.48 mA / cm 2 , 0.5 mA / cm 2 , 0.52 mA / cm 2 , 0.55 mA / cm 2 , etc. Any current density value within this range; electroplating time 1 min, and the gold electroplating solution temperature is 40-50°C, such as 40°C, 43°C, 45°C, 47°C, 50°C, etc. Any temperature value within this range.

[0086] Further, the gold electroplating solution formula is as follows: sodium chloroaurate 0.9-1.1 g / L, such as 0.9 g / L, 1.0 g / L, 1.1 g / L, etc. Any value within this range; sodium barbital 4.5-5.5 g / L, such as 4.5 g / L, 4.8 g / L, 5 g / L, 5.3 g / L, 5.5 g / L, etc. Any value within this range; and the constant current and the gold electroplating solution temperature also have different degrees of error, which are not described in detail here.

[0087] Further, in the embodiment, referring to Figure 4 , the electrode pair 440 is placed in the groove provided in the base 210 and corresponds to the test cavity 340, and the base 210 and the cavity 110 are bonded and sealed, and the sealing method can be connected by the bolt 370 and bonded by UV glue, so as to ensure that the detection solution does not leak subsequently.

[0088] In the embodiment, the reference electrode 430 adopts a silver-silver chloride electrode, and the silver-silver chloride electrode is prepared by the following process: taking a pure silver wire with a diameter of 0.5 mm as a basic reference electrode, placing the basic reference electrode in a hydrochloric acid solution, and depositing the basic reference electrode in the hydrochloric acid solution at a constant current for 5 min at room temperature, wherein the concentration of the hydrochloric acid solution ranges from 0.9 mol / L to 1.1 mol / L, for example, 0.9 mol / L, 1 mol / L, 1.1 mol / L, or any value within the range; and the constant current ranges from 0.9 mA to 1.1 mA, for example, 0.9 mA, 1 mA, 1.1 mA, or any value within the range.

[0089] In order to ensure that the potential is stable during the electrochemical test and reduce polarization, the reference cavity 320 provides a space for placing an electrolyte, and preferably, the electrolyte is a saturated potassium chloride gel.

[0090] For example, the reference electrode 430 is inserted into the reference cavity 320 through the socket 380, and the reference electrode 430 is in contact with the liquid contact part, and the other end is led out by the third lead 431; further, the third lead 431 is led out by the FPC flexible board 400.

[0091] Further, the FPC flexible board 400 can adopt a polyimide film substrate or a polyester film substrate.

[0092] In summary, the ion detection module is prepared based on microfluidic technology, and the ion detection module includes a cavity and a bottom plate from top to bottom, and the cavity and the bottom plate are sealingly connected, the annular counter electrode and the working electrode are arranged at the bottom of the test cavity, and the surfaces of the electrodes are plated with a gold layer to improve the test sensitivity and accuracy; the reference cavity, the liquid contact part cavity, and the test cavity are arranged around the same coaxial vertical stack, the reference cavity is filled with an electrolyte, and the liquid contact part cavity is electrically connected with the test liquid, so that the sample loading, storage, and emptying process can be realized, and the test cavity, the liquid contact part cavity, and the reference cavity are vertically integrated into one body, and portable heavy metal detection is easy to realize. Therefore, the ion detection module effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0093] The above embodiments only exemplarily illustrate the principles and effects of the ion detection module, and are not used to limit the ion detection module. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the ion detection module. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the ion detection module should be covered by the claims of the ion detection module.

Claims

1. An ion detection module, characterized by, The ion detection module comprises: a cavity structure comprising a cavity and a base, the cavity and the base being bonded, and the cavity structure comprising a reference cavity, a liquid junction cavity, a test cavity, a sample inlet channel and a sample outlet channel, wherein the reference cavity, the liquid junction cavity and the test cavity are coaxially stacked in sequence in the vertical direction; the reference cavity provides accommodation space for electrolyte; the sample inlet channel and the sample outlet channel are both in communication with the test cavity to provide a detection path for detection liquid; the liquid junction cavity provides accommodation space for a liquid junction and isolates the electrolyte and the detection liquid; an electrode pair, the electrode pair being located in the test cavity and comprising a working electrode and a counter electrode; a reference electrode, the reference electrode being located in the reference cavity.

2. The ion detection module of claim 1, wherein: The surface of the electrode pair has a gold layer.

3. The ion detection module of claim 1, wherein: The height ratio of the reference cavity, the liquid junction cavity and the test cavity is (2-3):1:(1.5-2); the diameter ratio of the reference cavity, the liquid junction cavity and the test cavity is (3-4):1:(2-3).

4. The ion detection module of claim 1, wherein: The ion detection module further comprises a socket member and a socket slot in the cavity, the socket slot being in communication with the reference cavity, and the socket member being arranged correspondingly with the socket slot, the socket member being provided with a socket in the shape of an X-shaped funnel or a V-shaped funnel.

5. The ion detection module of claim 1, wherein: The detection path is in the shape of a V-shaped distribution or an S-shaped distribution.

6. The ion detection module of claim 1, wherein: The cavity comprises one of a PMMA cavity, a polycarbonate cavity and a polyester cavity, and the base comprises one of a PMMA base, a polycarbonate base and a polyester base.

7. The ion detection module of claim 1, wherein: The counter electrode is in the shape of a ring and is distributed on the periphery of the working electrode.

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