CN113960132B - Flexible food salinity sensor and preparation method thereof - Google Patents
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Abstract
A flexible food salinity sensor and a preparation method thereof. And more particularly to sensors. The invention aims to solve the problems that the existing salinity meter can not measure the concentration of a single ion, is lack of identification and flexibility and limits the detectability and portability. The product is as follows: the left end face of the lower annular reduced graphene oxide base electrode positioned on one side of the first notch is covered with a potassium ion selective permeation film, the right end face of the right upper annular reduced graphene oxide base electrode positioned on the other side of the first notch is covered with a sodium ion selective permeation film, the circular reduced graphene oxide base electrode is covered with a silver/silver chloride reference electrode, and the silver/silver chloride reference electrode is covered with a PVB film. The method comprises the following steps: preparing a reduced graphene oxide substrate, preparing a sodium ion permselective membrane solution, preparing a potassium ion permselective membrane solution, preparing a flexible food salinity sensor, and preparing the flexible food salinity sensor. The invention is used for detecting the salinity of food.
Description
Technical Field
The invention relates to the field of sensors, in particular to a flexible food salinity sensor and a preparation method thereof.
Background
Based on the requirement and the higher and higher attention degree of the human beings on the health at present, the portable measuring system and the intelligent monitoring equipment provide solutions in the fields of health detection, self health management and the like. In order to quantitatively obtain the element amount of nutrient substances ingested by a human body every day, in the existing salinity sensor for detecting food, the traditional salinity meter often judges the ion concentration in a solution by measuring the conductivity of liquid, cannot measure a certain single ion concentration, is lack of identification degree, and has limited detectability and portability due to the problems of hard material, lack of flexibility, limited service life in toxic electrolyte and the like.
In summary, the prior art salinometer has the problems of inability to measure a single ion concentration, lack of identification, lack of flexibility, and limited detectability and portability.
Disclosure of Invention
The invention aims to solve the problems that the existing salinity meter cannot measure the concentration of a single ion, is lack of identification degree and flexibility and limits the detectability and portability, and further provides a flexible food salinity sensor and a preparation method thereof.
The technical scheme of the invention is as follows:
a flexible food salinity sensor comprises three copper wires, three conductive silver pastes, a reduced graphene oxide substrate electrode, a PVB film, a sodium ion selective permeation film, a silver/silver chloride reference electrode, a potassium ion selective permeation film, a multi-thread flat cable, a flexible substrate and a circuit board;
the multi-thread flat cable, the three copper wires, the three conductive silver pastes and the reduced graphene oxide base bottom electrode are sequentially arranged on the flexible substrate from bottom to top;
the reduced graphene oxide-based bottom electrode comprises an annular reduced graphene oxide-based electrode, a circular reduced graphene oxide-based electrode and three reduced graphene oxide-based bottom electrode rods;
a first notch and a second notch are correspondingly processed at the left upper part and the right lower part of the annular reduced graphene oxide base electrode respectively,
and both ends of the annular reduced graphene oxide substrate electrode positioned at the second notch are connected with one end of a reduced graphene oxide substrate electrode rod,
a circular reduced graphene oxide substrate electrode is arranged inside the annular reduced graphene oxide substrate electrode, and another reduced graphene oxide substrate electrode rod fixedly connected with the right lower part of the circular reduced graphene oxide substrate electrode extends along the second notch,
the three reduced graphene oxide substrate electrode rods are arranged side by side, a space is reserved between every two adjacent reduced graphene oxide substrate electrode rods, the other ends of the three reduced graphene oxide substrate electrode rods are respectively connected with one end of each copper wire through conductive silver paste, the other ends of the three copper wires are vertically and fixedly connected with the middle of one end of the multi-thread flat cable, and the other ends of the multi-thread flat cable are connected with a flat cable port of the circuit board;
the end face of the right side of the upper right annular reduced graphene oxide substrate electrode on the other side of the first notch is covered with a sodium ion selective permeation membrane, the end face of the circular reduced graphene oxide substrate electrode is covered with a silver/silver chloride reference electrode, and the silver/silver chloride reference electrode is covered with a PVB film.
A preparation method of a flexible food salinity sensor comprises the following steps:
the method comprises the following steps of firstly, preparing a reduced graphene oxide substrate electrode:
attaching a mask plate with a mask pattern to a clean PET film, coating a layer of water concentrated solution of graphene oxide on the PET film, wherein the concentration of the graphene oxide is 2.7 wt%, drying at room temperature for 12h, removing the mask plate, forming the graphene oxide film with an electrode pattern on the PET film, reducing the graphene oxide film by using hydroiodic acid for 10 min under the condition of an oil bath at 100 ℃, wherein the reduced graphene oxide film is tightly attached to the PET film and forms a reduced graphene oxide base electrode in the reduction process, cleaning the reduced graphene oxide film attached to the PET film by using absolute ethyl alcohol and deionized water, and drying at room temperature for 2 h;
step two, preparing a sodium ion permselective membrane solution:
fully mixing sodium ion carrier X, Na-TFPB powder, PVC powder and DOS solution to obtain white suspension mixed solution, dissolving the white suspension mixed solution in N-methylpyrrolidone to prepare sodium ion selective permeation membrane solution;
step three, preparation of a potassium ion permselective membrane solution:
fully mixing the solution of valinomycin, NaTPB powder, PVC powder and DOS to obtain white suspension mixed liquor, dissolving the white suspension mixed liquor in tetrahydrofuran to prepare potassium ion selective permeation membrane solution;
step four, preparing a PVC solution:
dissolving PVC powder and NaCl in methanol, and fully dissolving to obtain a PVC solution;
step five, preparing a flexible food salinity sensor:
respectively dripping the sodium ion permselective membrane solution prepared in the step two and the potassium ion permselective membrane solution prepared in the step three on the right end face of the annular reduced graphene oxide base electrode and the left end face of the annular reduced graphene oxide base electrode corresponding to the sodium ion permselective membrane solution and the potassium ion permselective membrane solution, coating Ag/AgCl ink on the circular reduced graphene oxide base electrode, drying at room temperature for a whole night, after the sodium ion permselective membrane solution, the potassium ion permselective membrane solution and the Ag/AgCl ink are dried, forming a sodium ion permselective membrane, a potassium ion permselective membrane and a silver/silver chloride reference electrode, wherein the right end faces of the sodium ion permselective membrane and the annular reduced graphene oxide base electrode form an all-solid sodium ion selective electrode, and the left end faces of the potassium ion permselective membrane and the annular reduced graphene oxide base electrode form an all-solid potassium ion selective electrode, coating a layer of PVC solution on a silver/silver chloride reference electrode, and drying for 30 minutes at 80 ℃ to form a PVC film, wherein the round reduced graphene oxide substrate electrode, the silver/silver chloride reference electrode and the PVC film form a reference electrode;
step six, the preparation of the flexible food salinity sensor is completed:
and the all-solid-state sodium ion selective electrode, the all-solid-state potassium ion selective electrode and the reference electrode are manufactured into a flexible food salinity sensor electrode array.
Compared with the prior art, the invention has the following effects:
the flexible food salinity sensor and the preparation method thereof adopt the reduced graphene oxide base electrode with extremely low dimension, high specific surface area and high conductive material as the substrate electrode, the electrode material as the electroactive material can be simultaneously used as the solid transfer layer and the substrate electrode in the selective electrode, the interface of the prior selective electrode is eliminated, the ion transmission signal can be efficiently converted into the electric signal, the electrode potential is favorably stabilized, the detection limit of the electrode is improved, the selective electrode is ensured to have excellent accuracy, the interference of the external environment is reduced, the flexible food salinity sensor can meet the salinity test of food in daily life, the single ion concentration can be accurately tested, the defects of the traditional salinity sensor are overcome, the whole device is flexible and controllable, the requirements of most application occasions can be met, and the device is integrally integrated in a circuit board, will detect and data analysis integration, facilitate the use, whole device cost of manufacture is low, and is nontoxic harmless, and convenient to use has solved current salinity meter and has had and can not measure certain single ion concentration, lacks the degree of discernment, lacks the flexibility and has restricted the problem of detectability and portability.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic diagram of a circuit board of the present invention;
FIG. 4 is a schematic view of another circuit board of the present invention;
FIG. 5 is a schematic of an ion concentration test curve of the present invention;
FIG. 6 is a schematic diagram of the present invention showing the test identification of the sodium ion concentration, wherein the inset is a schematic diagram of the linear fit between the sodium ion concentration and the potential difference.
Detailed Description
The first embodiment is as follows: referring to fig. 1 to 4, the flexible food salinity sensor of the present embodiment is characterized in that: the device comprises three copper wires 1, three conductive silver pastes 2, a reduced graphene oxide substrate electrode 3, a PVB film 4, a sodium ion selective permeation film 5, a silver/silver chloride reference electrode 6, a potassium ion selective permeation film 7, a multi-thread flat cable 8, a flexible substrate 9 and a circuit board;
the multithread flat cable 8, the three copper wires 1, the three conductive silver pastes 2 and the reduced graphene oxide base electrode 3 are sequentially arranged on the flexible substrate 9 from bottom to top;
the reduced graphene oxide substrate electrode 3 comprises an annular reduced graphene oxide substrate electrode 3-1, a circular reduced graphene oxide substrate electrode 3-2 and three reduced graphene oxide substrate electrode rods 3-3;
a first notch 3-4 and a second notch 3-5 are correspondingly processed at the upper left side and the right side of the annular reduced graphene oxide substrate electrode 3-1 respectively,
and both ends of the annular reduced graphene oxide substrate electrode 3-1 at the second notch 3-5 are connected with one end of a reduced graphene oxide substrate electrode rod 3-3,
a circular reduced graphene oxide substrate electrode 3-2 is arranged inside the annular reduced graphene oxide substrate electrode 3-1, and another reduced graphene oxide substrate electrode rod 3-3 fixedly connected with the right lower part of the circular reduced graphene oxide substrate electrode 3-2 extends along the second notch 3-5,
the three reduced graphene oxide substrate electrode rods 3-3 are arranged side by side, a space is reserved between every two adjacent reduced graphene oxide substrate electrode rods 3-3, the other ends of the three reduced graphene oxide substrate electrode rods 3-3 are respectively connected with one end of each copper wire 1 through a conductive silver paste 2, the other ends of the three copper wires 1 are vertically and fixedly connected with the middle part of one end of the multi-thread flat cable 8, and the other end of the multi-thread flat cable 8 is connected with a flat cable port 10 of the circuit board;
the left end face of the lower annular reduced graphene oxide base electrode 3-1 positioned on one side of the first notch 3-4 is full of a potassium ion permselective membrane 7, the right end face of the upper right annular reduced graphene oxide base electrode 3-1 positioned on the other side of the first notch 3-4 is full of a sodium ion permselective membrane 5, the end face of the round reduced graphene oxide base electrode 3-2 is full of a silver/silver chloride reference electrode 6, and the silver/silver chloride reference electrode 6 is full of a PVB film 4.
The reason why the PVB film 4 is covered with the silver/silver chloride reference electrode 6 is that the PVB film 4 is thin and light, and the silver/silver chloride reference electrode 6 can provide a stable potential.
The conductive silver paste 2 is arranged so as to ensure that the reduced graphene oxide substrate electrode rods 3-3 and the three copper wires 1 can be stably bonded without falling off under the action of the conductive silver paste 2.
The three conductive silver pastes 2, the sodium ion permselective membrane 5, the silver/silver chloride reference electrode 6 and the potassium ion permselective membrane 7 are all arranged in a thin film shape.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 1, in which the flexible substrate 9 of the present embodiment is a transparent PET film, a polyimide film, or a polypropylene film, the thickness of the PET film is W1, and W1 is 80 um. The rest is the same as the first embodiment.
The third concrete implementation mode: referring to fig. 1, the three reduced graphene oxide-based electrode rods 3 to 3 of the present embodiment are all W2, and W2 is 2 mm.
The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: in the present embodiment, the diameter of the circular reduced graphene oxide base electrode 3-2 of the present embodiment is R, and R is 6mm, as described with reference to fig. 1. The others are the same as the first, second or third embodiments.
The fifth concrete implementation mode is as follows: referring to fig. 1 to 6, the method for manufacturing the flexible food salinity sensor of the present embodiment is characterized in that: it comprises the following steps:
step one, preparing a reduced graphene oxide substrate electrode 3:
attaching a mask plate with a mask pattern to a clean PET film, coating a layer of water concentrated solution of graphene oxide on the PET film, wherein the concentration of the graphene oxide is 2.7 wt%, drying at room temperature for 12h, removing the mask plate, forming the graphene oxide film with an electrode pattern on the PET film, reducing the graphene oxide film by using hydroiodic acid for 10 min under the condition of an oil bath at 100 ℃, wherein the reduced graphene oxide film is tightly attached to the PET film and forms a reduced graphene oxide substrate electrode 3 in the reduction process, cleaning the reduced graphene oxide film attached to the PET film by using absolute ethyl alcohol and deionized water, and drying at room temperature for 2 h;
step two, preparation of sodium ion selective permeation membrane solution:
fully mixing sodium ion carrier X, Na-TFPB powder, PVC powder and DOS solution to obtain white suspension mixed solution, dissolving the white suspension mixed solution in N-methylpyrrolidone to prepare sodium ion selective permeation membrane solution;
step three, preparation of a potassium ion permselective membrane solution:
fully mixing the solution of valinomycin, NaTPB powder, PVC powder and DOS to obtain white suspension mixed liquor, dissolving the white suspension mixed liquor in tetrahydrofuran to prepare potassium ion selective permeation membrane solution;
step four, preparing a PVC solution:
dissolving PVC powder and NaCl in methanol, and fully dissolving to obtain a PVC solution;
step five, preparing a flexible food salinity sensor:
respectively dripping the sodium ion permselective membrane solution prepared in the step two and the potassium ion permselective membrane solution prepared in the step three on the right end face of the annular reduced graphene oxide substrate electrode 3-1 and the left end face of the annular reduced graphene oxide substrate electrode 3-1 corresponding to the sodium ion permselective membrane solution and the potassium ion permselective membrane solution, coating Ag/AgCl ink on the circular reduced graphene oxide substrate electrode 3-2, drying at room temperature for a whole night, drying the sodium ion permselective membrane solution, the potassium ion permselective membrane solution and the Ag/AgCl ink to form a sodium ion permselective membrane 5, a potassium ion permselective membrane 7 and a silver/silver chloride reference electrode 6, wherein the sodium ion permselective membrane 5 and the right end face of the annular reduced graphene oxide substrate electrode 3-1 form an all-solid sodium ion selective electrode, and the potassium ion permselective membrane 7 and the left end face of the annular reduced graphene oxide substrate electrode 3-1 form an all-solid potassium ion selective electrode Selecting an electrode, coating a layer of PVC solution on a silver/silver chloride reference electrode 6, and drying for 30 minutes at 80 ℃ to form a PVC film, wherein the round reduced graphene oxide substrate electrode 3-2, the silver/silver chloride reference electrode 6 and the PVC film form the reference electrode;
step six, the preparation of the flexible food salinity sensor is completed:
and the all-solid-state sodium ion selective electrode, the all-solid-state potassium ion selective electrode and the reference electrode are manufactured into a flexible food salinity sensor electrode array.
According to the arrangement, the reduced graphene oxide is obtained by reducing the graphene oxide coated on the flexible substrate through hydroiodic acid, the reduced graphene oxide is high in conductivity and can be attached to the surface of the flexible substrate without falling off, and the formed base electrode is light and thin.
The sixth specific implementation mode is as follows: referring to fig. 1 to 5, the reduced graphene oxide substrate electrode 3 in the first step of the present embodiment may be replaced by graphene, carbon nanotubes, PEDOT, a graphite electrode film or a carbon nanotube film.
The rest is the same as the fifth embodiment.
The seventh embodiment: in the second step of the present embodiment, the sodium ion permselective membrane solution is prepared by mixing 55.0mg of Na-TFPB powder, 100mg of Na ionophore X, 3.3g of PVC powder, and 6.545g of DOS solution, stirring them thoroughly to obtain a white suspension, dispersing 100mg of the white suspension in 660ul of N-methylpyrrolidone, and dissolving them in a water bath at 60 ℃. The other is the same as the fifth or sixth embodiment.
The specific implementation mode is eight: in the present embodiment, the preparation of the potassium ion permselective membrane solution in step III of the present embodiment will be described with reference to FIG. 1. 200.0mg of valinomycin, 50.0mg of Na-TPB powder, and 3.27g of PVC powder, and 6.47g of DOS solution were mixed and sufficiently stirred to obtain a white suspension mixture, and 100mg of the white suspension mixture was dispersed in 320. mu.l of tetrahydrofuran and dissolved by stirring and mixing at room temperature to prepare a potassium ion permselective membrane solution. The rest is the same as the fifth, sixth or seventh embodiment.
The specific implementation method nine: referring to fig. 1 to 5, the embodiment is illustrated, wherein the N-methylpyrrolidone in step two of the embodiment may be replaced by cyclohexanone, N-methylpyrrolidone or tetrahydrofuran, and the tetrahydrofuran in step three of the embodiment may be replaced by cyclohexanone, N-dimethylformamide or N-methylpyrrolidone. The others are the same as the fifth, sixth, seventh or eighth embodiments.
The detailed implementation mode is ten: referring to FIG. 1 for the description of the present embodiment, the preparation of PVC solution in step four of the present embodiment is carried out by dissolving 79mg of PVB powder and 50mg of NaCl in 1.0mL of methanol to obtain a PVC solution. The others are the same as those in any of the fifth to ninth embodiments.
The concrete implementation mode eleven: in the present embodiment, the ratio of silver to silver chloride in the silver/silver chloride reference electrode 6 is 40% to 60% as described with reference to fig. 1. The others are the same as any of the fifth to tenth embodiments.
The specific implementation mode twelve: referring to fig. 1, the resistivity of the reduced graphene oxide substrate electrode 3 in the first step of the present embodiment is 4.2 × 10-4Omega.m. The reduced graphene oxide substrate electrode 3 thus arranged has good conductivity. The rest is the same as any one of the fifth to eleventh embodiments.
The specific implementation mode is thirteen: referring to fig. 1, the present embodiment is described, and in the first step of the present embodiment, the water concentrate of graphene oxide is prepared by a modified hummer's method. The rest is the same as any of the fifth to twelfth embodiments.
The first embodiment is as follows:
the sodium ion permselective membrane 5, the silver/silver chloride reference electrode 6 and the potassium ion permselective membrane 7 in the flexible food salinity sensor are immersed into the tested liquid, the sodium ion permselective membrane 5 and the potassium ion permselective membrane 7 respectively form a potential difference with the silver/silver chloride reference electrode 6, the point difference is transmitted to a circuit board through an external circuit, the circuit board adjusts and amplifies an electric signal, and the concentration of sodium ions and potassium ions in the tested liquid can be tested through the obtained potential difference.
Example two:
the prepared electrodes are connected to a circuit board through a multi-thread flat cable 8, the connected circuit board is connected to a computer end, the ion concentration in the solution can be measured by reading the potential difference of the all-solid-state sodium ion selective electrode, the all-solid-state potassium ion selective electrode and the reference electrode, in the example, the prepared all-solid-state sodium ion selective electrode and the all-solid-state potassium ion selective electrode are soaked into NaCl solution with the sodium ion concentration of 10-100mM, and the potential difference between the all-solid-state sodium ion selective electrode and the reference electrode is tested for 10 times to obtain an ion concentration test curve (see figure 5). Solution measurements at different target ion concentrations at different times can be found for each different sodium ionThe stable potential difference can be kept in the concentration solution, the measured potential difference is increased along with the increase of the concentration of the ions to be measured in the solution, and the potential difference between different concentrations has step jump, which indicates that the sensitivity of the sensor is high (see figure 6). Then 10-200mM NaCl solution is measured, the Na ion concentration is well identified, the average potential difference is increased from 0.139V to 0.225V, the concentration and the potential difference are linearly fitted, and the potential difference and the concentration log [ Na ] are obtained+]Almost straight lines indicate that the test linearity is good for preparing flexible electrodes (see fig. 6), which is advantageous for solution measurements of different concentrations and reduces measurement errors due to the need for calibration of the electrodes.
The present invention has been described in terms of the preferred embodiments, but it is not limited thereto, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention will still fall within the technical scope of the present invention.
Claims (5)
1. A flexible food salinity sensor, characterized by: the device comprises three copper wires (1), three conductive silver pastes (2), a reduced graphene oxide substrate electrode (3), a PVB film (4), a sodium ion selective permeable film (5), a silver/silver chloride reference electrode (6), a potassium ion selective permeable film (7), a multi-thread flat cable (8), a flexible substrate (9) and a circuit board;
the multi-thread flat cable (8), the three copper wires (1), the three conductive silver pastes (2) and the reduced graphene oxide base electrode (3) are sequentially arranged on the flexible substrate (9) from bottom to top;
the reduced graphene oxide base electrode (3) comprises an annular reduced graphene oxide base electrode (3-1), a round reduced graphene oxide base electrode (3-2) and three reduced graphene oxide base electrode rods (3-3);
a first notch (3-4) and a second notch (3-5) are correspondingly processed at the upper left side and the right side of the annular reduced graphene oxide substrate electrode (3-1), both ends of the annular reduced graphene oxide substrate electrode (3-1) at the second notch (3-5) are connected with one end of a reduced graphene oxide substrate electrode rod (3-3),
a round reduced graphene oxide substrate electrode (3-2) is arranged inside the annular reduced graphene oxide substrate electrode (3-1), and another reduced graphene oxide substrate electrode rod (3-3) fixedly connected with the right lower part of the round reduced graphene oxide substrate electrode (3-2) extends along the second notch (3-5),
the three reduced graphene oxide substrate electrode rods (3-3) are arranged side by side, a space is reserved between every two adjacent reduced graphene oxide substrate electrode rods (3-3), the other ends of the three reduced graphene oxide substrate electrode rods (3-3) are respectively connected with one end of each copper wire (1) through one conductive silver paste (2), the other ends of the three copper wires (1) are vertically and fixedly connected with the middle part of one end of a multi-thread flat cable (8), and the other end of the multi-thread flat cable (8) is connected with a flat cable port (10) of a circuit board;
a potassium ion permselective membrane (7) is distributed on the left end face of the lower annular reduced graphene oxide base electrode (3-1) positioned on one side of the first notch (3-4), a sodium ion permselective membrane (5) is distributed on the right end face of the upper right annular reduced graphene oxide base electrode (3-1) positioned on the other side of the first notch (3-4), a silver/silver chloride reference electrode (6) is distributed on the end face of the circular reduced graphene oxide base electrode (3-2), and a PVB film (4) is distributed on the silver/silver chloride reference electrode (6);
the widths of the three reduced graphene oxide substrate electrode rods (3-3) are W2, and W2 is 2 mm; the diameter of the round reduced graphene oxide substrate electrode (3-2) is R, and R is 6 mm;
the preparation method of the flexible food salinity sensor comprises the following steps:
step one, preparing a reduced graphene oxide substrate electrode (3):
attaching a mask plate with a mask pattern to a clean PET film, coating a layer of graphene oxide water concentrated solution on the PET film, wherein the concentration of graphene oxide is 2.7 wt%, drying at room temperature for 12h, removing the mask plate, forming a graphene oxide film with an electrode pattern on the PET film, reducing the graphene oxide film by using hydroiodic acid for 10 min under the condition of an oil bath at 100 ℃, wherein the reduced graphene oxide film is tightly attached to the PET film in the reduction process to form a reduced graphene oxide base electrode (3), cleaning the reduced graphene oxide film attached to the PET film by using absolute ethyl alcohol and deionized water, and drying at room temperature for 2 h;
step two, preparing a sodium ion permselective membrane solution:
mixing 55.0mg of Na-TFPB powder, 100mg of Na ion carrier X, 3.3g of PVC powder and 6.545g of DOS solution, fully stirring to obtain white suspension mixed liquor, dispersing the 100mg of white suspension mixed liquor into 660ul of N-methylpyrrolidone, mixing and dissolving under the condition of water bath at 60 ℃ to prepare sodium ion selective permeation membrane solution;
step three, preparation of a potassium ion permselective membrane solution:
mixing 200.0mg of valinomycin, 50.0mg of Na-TPB powder, 3.27g of PVC powder and 6.47g of DOS solution, fully stirring to obtain a white suspension mixed solution, dispersing 100mg of the white suspension mixed solution in 320ul of tetrahydrofuran, stirring at room temperature, mixing and dissolving to prepare a potassium ion selective permeation membrane solution;
step four, preparing a PVC solution:
dissolving 79mg of PVB powder and 50mg of NaCl in 1.0mL of methanol to obtain a PVC solution;
step five, preparing a flexible food salinity sensor:
respectively dripping the sodium ion permselective membrane solution prepared in the step two and the potassium ion permselective membrane solution prepared in the step three on the right end face of the annular reduced graphene oxide base electrode (3-1) and the left end face of the annular reduced graphene oxide base electrode (3-1) corresponding to the sodium ion permselective membrane solution and the potassium ion permselective membrane solution, coating Ag/AgCl ink on the circular reduced graphene oxide base electrode (3-2), drying at room temperature overnight, forming a sodium ion permselective membrane (5), a potassium ion permselective membrane (7) and a silver/silver chloride reference electrode (6) after the sodium ion permselective membrane solution, the potassium ion permselective membrane solution and the Ag/AgCl ink are dried, and forming an all-solid-state sodium ion selective electrode by the sodium ion permselective membrane (5) and the right end face of the annular reduced graphene oxide base electrode (3-1), the potassium ion selective permeation membrane (7) and the left side end face of the annular reduced graphene oxide substrate electrode (3-1) form an all-solid-state potassium ion selective electrode, a layer of PVC solution is coated on the silver/silver chloride reference electrode (6), and the silver/silver chloride reference electrode (6) and the PVC film are dried for 30 minutes at 80 ℃ to form a PVC film, and the round reduced graphene oxide substrate electrode (3-2), the silver/silver chloride reference electrode (6) and the PVC film form a reference electrode;
step six, the preparation of the flexible food salinity sensor is completed:
and the all-solid-state sodium ion selective electrode, the all-solid-state potassium ion selective electrode and the reference electrode are manufactured into a flexible food salinity sensor electrode array.
2. The flexible food salinity sensor of claim 1, wherein: the flexible substrate (9) is a transparent PET film, a polyimide film or a polypropylene film, wherein the thickness of the PET film is W1, and W1 is 80 um.
3. The flexible food salinity sensor of claim 1, wherein: in the first step, the reduced graphene oxide base electrode (3) can be replaced by graphene, carbon nanotubes, PEDOT, a graphite electrode film or a carbon nanotube film.
4. The flexible food salinity sensor of claim 1, wherein: the N-methylpyrrolidone in the second step can be replaced by cyclohexanone, N-methylpyrrolidone or tetrahydrofuran, and the tetrahydrofuran in the third step can be replaced by cyclohexanone, N, N-dimethylformamide or N-methylpyrrolidone.
5. The flexible food salinity sensor of claim 1, wherein: preparation of PVC solution in step four 79mg of PVB powder and 50mg of NaCl were dissolved in 1.0mL of methanol sufficiently to obtain a PVC solution.
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|---|---|---|---|---|
| CN109646015A (en) * | 2019-01-17 | 2019-04-19 | 浙江大学 | A kind of wireless and passive flexible sensing device and method for sweat ion detection |
| CN110192868A (en) * | 2019-05-24 | 2019-09-03 | 厦门大学 | Flexible calcium potassium ion detection sensor based on graphene composite material and preparation method thereof |
| CN211022697U (en) * | 2019-05-24 | 2020-07-17 | 厦门大学 | Flexible calcium potassium ion detection sensor based on graphene composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109646015A (en) * | 2019-01-17 | 2019-04-19 | 浙江大学 | A kind of wireless and passive flexible sensing device and method for sweat ion detection |
| CN110192868A (en) * | 2019-05-24 | 2019-09-03 | 厦门大学 | Flexible calcium potassium ion detection sensor based on graphene composite material and preparation method thereof |
| CN211022697U (en) * | 2019-05-24 | 2020-07-17 | 厦门大学 | Flexible calcium potassium ion detection sensor based on graphene composite material |
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