KR20210009543A - Egg membrane humidity sensing apparatus - Google Patents

Abstract

The present disclosure is to provide a device capable of reliably sensing humidity even on a surface of various shapes or a surface that can be deformed into various shapes. The present disclosure may provide a humidity sensor comprising: an egg membrane; and an interdigital electrode formed on the egg membrane.

Description

Nanmak humidity sensing device {EGG MEMBRANE HUMIDITY SENSING APPARATUS}

The present disclosure relates to an apparatus using the egg membrane, and specifically, to an apparatus for sensing humidity by using the egg membrane.

Humidity monitoring is an important environmental sensing element in daily life and industrial environments such as medical and food.

The humidity sensor detects moisture in the air through changes in various parameters including resistance (impedance), capacitance, surface acoustic waves, and piezoelectricity. In particular, resistance and capacitance sensors have gained interest in terms of integration of electrical circuits because of their low cost, ease of manufacture, and direct electrical reading.

Accordingly, there is a need to develop a device capable of effectively sensing humidity in various places while functioning as a resistance and capacitance sensor.

An object of the present disclosure is to provide a device capable of reliably sensing humidity even on a surface of various shapes or on a surface that can be deformed into various shapes.

The present disclosure is intended to provide a device that can be bent with flexibility.

The present disclosure is to provide an eco-friendly device.

An object of the present disclosure is to provide a device capable of self-generating and sensing humidity.

By the present disclosure, the egg membrane (egg membrane); And a humidity sensor including an interdigital electrode formed on the egg membrane may be provided.

According to an embodiment, the egg membrane may be provided with a humidity sensor that is an egg egg membrane.

According to an embodiment, a humidity sensor having the same finger width and spacing width of the interdigital electrode may be provided.

According to an embodiment, a humidity sensor having the finger width and the spacing width of 100 μm may be provided.

According to an embodiment, the humidity sensor may be provided with a humidity sensor that does not have a separate substrate.

According to an embodiment, the egg membrane may be provided with a humidity sensor that functions as an active sensing layer and a substrate.

According to an embodiment, a humidity sensor capable of sensing humidity by both impedance response and capacitance response may be provided.

According to an embodiment, a humidity sensor in which the egg membrane functions as electricity generation power may be provided.

According to an exemplary embodiment, a humidity sensor for generating triboelectricity in a region in the egg membrane where the interdigital electrode is not located may be provided.

According to an embodiment, two electrodes respectively positioned above and below the egg membrane; And a humidity sensor may be provided that further includes an encapsulation unit for sealing the two electrodes.

According to an embodiment, a device capable of reliably sensing humidity may be provided on a surface of various shapes or on a surface that can be deformed into various shapes.

According to one embodiment, it is possible to provide a device that can be bent with flexibility.

According to an embodiment, an eco-friendly device may be provided.

According to an embodiment, a device capable of self-powered and sensing humidity may be provided.

1 is a diagram illustrating a method of extracting egg yolk from an egg according to an exemplary embodiment.
2 is a view for explaining the characteristics of the egg membrane.
3 is a diagram for describing a method of manufacturing a humidity sensor including an egg membrane according to an exemplary embodiment.
4 is a diagram for describing characteristics of electrodes of a humidity sensor according to an exemplary embodiment.
5 is a graph for explaining a relationship between impedance and relative humidity of a humidity sensor according to an exemplary embodiment.
6 is a graph for explaining a relationship between capacitance and relative humidity of a humidity sensor according to an exemplary embodiment.
7 is a graph for explaining the reliability of a humidity sensor according to an embodiment.
8 is a graph for explaining a difference in absorbing and removing water by a humidity sensor according to an exemplary embodiment.
9 is a view for explaining the flexibility of the humidity sensor according to an embodiment.
10 is a diagram for describing a method of manufacturing a power generating device including a Nanmak according to an exemplary embodiment.
11 is a diagram for describing a principle of generating electricity in a power generating device according to an exemplary embodiment.
12 is a diagram illustrating a voltage of electricity generated by a power generating device according to an exemplary embodiment.
13 is a block diagram of a self-generated humidity sensor according to an embodiment.
14 illustrates a self-generated humidity sensor according to an embodiment.

It should be noted that the technical terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. In addition, the technical terms used in the present invention should be interpreted as generally understood by those of ordinary skill in the technical field to which the present invention belongs, unless otherwise defined in the present invention, and is excessively comprehensive. It should not be construed as a human meaning or an excessively reduced meaning. In addition, when a technical term used in the present invention is an incorrect technical term that does not accurately express the spirit of the present invention, it should be replaced with a technical term that can be correctly understood by those skilled in the art. In addition, general terms used in the present invention should be interpreted as defined in the dictionary or according to the context before and after, and should not be interpreted as an excessively reduced meaning.

In addition, the singular expression used in the present invention includes a plurality of expressions unless the context clearly indicates otherwise. In the present invention, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various elements or various steps described in the invention, and some of the elements or some steps are included. It should be construed that it may not be, or may further include additional components or steps.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of the reference numerals, and redundant descriptions thereof will be omitted.

1 is a view for explaining a method of extracting an egg membrane (egg membrane) from an egg according to an embodiment. Although the egg membrane was extracted from an egg according to an embodiment, the egg membrane may be extracted from eggs of animals other than chicken. As the egg membrane according to an embodiment, an egg shell membrane may be used. As the handrail according to an embodiment, an inner egg shell membrane (IESM) may be used.

IESM is attached to the egg shell, i.e. the egg shell, to extract IESM from the egg,

As shown in Fig. 1, eggs may be treated with vinegar for a predetermined time or longer. For example, you can soak an egg in vinegar at room temperature of 28 degrees. Over time, the shell can be removed from the egg.

Eggs from which the shell has been removed, that is, processed through the above process, can have a rubber-like texture, and the processed eggs are surrounded by IESM. By making a hole on the surface of the IESM and flowing white and yellow yolk through the hole, the IESM can be obtained as shown in FIG. 1.

The obtained IESM can be cleaned. Ethanol and ultrapure water can be used for washing. IESM may be dried at room temperature, but may also be dried with a dryer.

2 is a view for explaining the characteristics of the egg membrane.

According to an embodiment, as the egg membrane of an egg, an inner egg shell membrane (IESM) may be used.

Figure 2(a) shows a cross section of the IESM. The dried IESM may have a thickness of about 19 μm. The average value (μ) of the dried IESM was 19.67 μm, the standard deviation (σ) was 0.94 μm, and the dispersion (σ²) was 0.89 μm. The thickness of the IESM used in the humidity sensor according to an embodiment may be about 19 μm, but is not limited thereto.

2(b) shows the result of FTIR (form infrared spectroscopy) of IESM. Referring to FIG. 2(b), in the IESM used for the humidity sensor according to an embodiment, a peak of amide I representing C=O stretching vibration appears at about 1650cm ^-1 , and NH The peak of amide II, indicating in plane bending and CN stretching, may appear at about 1440cm ^-1 , and the peak of amide A, indicating NH stretching vibration, may appear at about 3400cm ^-1 . . In IESM, the absorption band may exhibit the stretching vibration of the CS coupling at 670 cm ^-1 .

2(c) is a graph illustrating the surface morphology of IESM. Referring to FIG. 2(c), the IESM may be composed of pores having a diameter of about 5 μm and protein fibers having a cross-linked diameter of about 0.5-1.5 μm.

2(d) is an EDS (energy dispersive x-ray spectroscopy) graph showing the element composition of IESM. 2(d), IESM may include C, O, Na, and S, and in this case, the mass ratio may be 67.06%, 27.03%, 0.14%, and 5.77%, respectively, but is not limited thereto. . IESM may include a carbonyl, an amino protein and a carboxyl group.

3 is a diagram for describing a method of manufacturing a humidity sensor including an egg membrane according to an exemplary embodiment.

Referring to FIG. 3, the humidity sensor according to an embodiment may be implemented by forming a egg membrane and inter digital electrodes (IDEs) on the egg membrane. IDEs may be printed on the IESM, but are not limited thereto and may be formed on the IESM through various methods. IDEs may include Ag and may be formed by Ag nanoparticles, but are not limited thereto.

At this time, since the egg film, that is, the IESM, functions as both the substrate of the sensor and the active sensing layer, a humidity sensor having a thin thickness can be implemented.

IDEs can be defined by the finger width, which is the width of the electrode itself, and the spacing width, which is the width of the space between the electrodes. For example, IDEs may have a finger width of 100 μm and a spacing width of 100 μm, but are not limited thereto. The finger width and spacing width of IDEs may be 200 μm, 300 μm, 400 μm, etc., but the finger width and spacing width may be different from each other.

IDEs of the humidity sensor tested in the present disclosure have a finger width of 100㎛ and a spacing width of 100㎛, the first humidity sensor having an area of 10mm * 4mm, the second humidity sensor having an area of 12mm * 6mm for the test. Was used.

4 is a diagram for describing characteristics of electrodes of a humidity sensor according to an exemplary embodiment.

Figure 4(a) shows a microscopic image of IDEs and a 2D nano profile. Figure 4(b) shows the 3D surface nanoprofiles of IDEs. 4(a) and (b), IDEs printed on IESM have a roughness of about 197.33 nm and may be uniformly structured.

Figure 4(c) shows a histogram for the height profile of IDEs. Referring to FIG. 4(c), IDEs printed on IESM may have a thickness of about 1.77 μm.

Figure 4(d) shows a scanning electron microscopy (SEM) image of IDEs.

5 is a graph for explaining a relationship between impedance and relative humidity of a humidity sensor according to an exemplary embodiment.

5(a) and 5(b) show the relationship between impedance and relative humidity at 1Khz and 10Khz of the first humidity sensor. 5(c) and 5(d) show the relationship between impedance and relative humidity at 1Khz and 10Khz of the second humidity sensor.

5(a) to 5(d), since the impedance of the humidity sensor changes according to the change in relative humidity, that is, the impedance decreases as the humidity level increases, the humidity is controlled based on this relationship. You can sense it. On the other hand, based on the following equation (1), the impedance state of the humidity sensor is inversely proportional to the test frequency.

(1)

(One)

Where R, f, and C are resistance, frequency, and capacitance, respectively.

6 is a graph for explaining a relationship between capacitance and relative humidity of a humidity sensor according to an exemplary embodiment.

6(a) and 6(b) show the relationship between capacitance and relative humidity at 1Khz and 10Khz of the first humidity sensor. 6(c) and 6(d) show the relationship between capacitance and relative humidity at 1Khz and 10Khz of the second humidity sensor.

6(a) to 6(d), the humidity sensor changes the capacitance according to the change of the relative humidity, that is, the capacitance increases with the increase of the humidity level, so that the humidity is increased based on this relationship. You can sense it. At this time, absorption of water molecules changes a dielectric coefficient, and thus, a capacitance of the humidity sensor may be changed. As the relative humidity increases, the impedance decreases and the capacitance increases. On the other hand, based on Equation (2) below, the capacitance of the humidity sensor decreases as the test frequency increases, and this phenomenon occurs due to leakage of leakage conduction or the like as the frequency increases.

(2)

(2)

은 각각 복소유전상수 (complexe dielectric constant), 예상 커패시턴스, 컨덕턴스, 주파수, 이상적 커패시터의 상대유전상수 (relative dielectric constant), 및 자유 공간의 유전율 (permittivity of free space) 이다.here,

Is the complex dielectric constant, the expected capacitance, conductance, frequency, the relative dielectric constant of the ideal capacitor, and the permittivity of free space, respectively.

7 is a graph for explaining the reliability of a humidity sensor according to an embodiment.

7(a) and 7(b) are graphs for explaining a response time (T _res ) and a recovery time (T _rec ) of the first humidity sensor and the second humidity sensor.

Referring to FIG. 7(a), in the transient response of the first humidity sensor, the response time (T _res ) and the recovery time (T _rec ) represent about 1.99 seconds and about 8.76 seconds, respectively, and FIG. 7 Referring to (b), in the transient response of the second humidity sensor, the response time (T _res ) and the recovery time (T _rec ) represent about 2.32 seconds and about 9.21 seconds, respectively. Due to the response time and recovery time, the humidity sensor using IESM can be fully utilized in real life.

7(c) and 7(d) are graphs for explaining impedance consistency between the first humidity sensor and the second humidity sensor when the same environment continues. The first humidity sensor and the second humidity sensor were tested under 90%, 40%, and 0% relative humidity, respectively, at a 1KHz frequency in the chamber for 120 minutes, and during the test period, the impedance corresponding to the relative humidity was consistently maintained. . Due to this degree of consistency, the humidity sensor using IESM can be fully utilized in real life.

8 is a graph for explaining a difference in absorbing and removing water by a humidity sensor according to an exemplary embodiment.

8(a) and 8(b) are graphs for explaining changes in impedance when water is absorbed and removed by the first humidity sensor and the second humidity sensor, respectively. The difference that occurs during water absorption and removal is caused by hysyeresis loss. According to an embodiment, humidity may be sensed in consideration of this loss.

9 is a view for explaining the flexibility of the humidity sensor according to an embodiment. 9(a) to 9(c), the humidity sensor may sense humidity by being positioned on an object having a diameter of about 5.53 mm, 10 mm, and 13.1 mm, respectively. Referring to FIG. 9(d), the humidity sensor according to an exemplary embodiment changes impedance according to a change in relative humidity even on various surfaces, and thus may be usefully used in real life. In particular, the humidity sensor according to an embodiment may be usefully used in the wearable field.

9(e) shows a field emission scanning electron microscopy (FESEM) image of IDEs after being transferred to an arbitrary surface. As shown in FIG. 9(e), after the IDEs are bent, the impedance response of the sensor increases due to micro cracks formed in the IDEs.

Since the IESM can be freely positioned on any surface, the humidity sensor using the IESM can be usefully used in real life.

Figure 9(f) shows the spot profile of IDEs after being transferred to any surface. IDEs can maintain their composition even on a variety of surfaces.

10 is a diagram for describing a method of manufacturing a power generating device including a Nanmak according to an exemplary embodiment.

Referring to FIG. 10, a power generating device may be manufactured using a Nanmak, for example, IESM. The power generating device may be referred to as a nanogenerator.

The power generating device according to an embodiment may be manufactured by forming an upper electrode and a lower electrode on the upper and lower portions of the IESM, respectively, connecting wires from the electrodes, and encapsulating the electrodes. According to an embodiment, the encapsulation portion for encapsulating the electrodes may be formed of polydimethylsiloxane (PDMS).

11 is a diagram for describing a principle of generating electricity in a power generating device according to an exemplary embodiment.

Referring to FIG. 11, since the IESM has a porous structure, when pressure is applied to the IESM, the porous structure is pressed and triboelectricity is generated, thereby generating electricity. Due to the porous structure of the IESM, the power generating device according to an embodiment has a characteristic that electricity is generated only in a region to which pressure is applied.

12 is a diagram illustrating a voltage of electricity generated by a power generating device according to an exemplary embodiment. The left graph of FIG. 12 shows the developed signal, and the right graph shows the signal passed through the rectifier circuit.

13 is a block diagram of a self-generated humidity sensor according to an embodiment.

The self-generated humidity sensor according to an embodiment may include a power generating device 100 and a humidity sensor 300. The self-generated humidity sensor according to an embodiment may further include a resistor 200 positioned between the power generating device 100 and the humidity sensor 300.

In the self-generated humidity sensor according to an embodiment, both a power generating device and a humidity sensor may be implemented using one IESM. A method of implementing both the power generating device and the humidity sensor using one IESM will be described with reference to FIG. 14.

14 illustrates a self-generated humidity sensor according to an embodiment.

Referring to FIG. 14, the self-generating humidity sensor may include a power generation device including a egg membrane 110, for example, an IESM 110, two electrodes 120, and an encapsulation unit 130, Humidity can be sensed using IDEs 320 formed on IESM 110. The electrode 120 may comprise a copper electrode.

The self-generating humidity sensor according to an embodiment may further include a resistor 200 and a resistance electrode 210 positioned between the power generating device and the humidity sensor. The resistor 200 may be printed on the encapsulation, and the resistor 200 may be printed with a material such as PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate), PMMA (poly methyl methacrylate), or the like. The resistance electrode 210 may include Ag, and may be formed of Ag nanoparticles, but is not limited thereto.

The self-generating humidity sensor according to an embodiment may generate electricity and sense humidity at the same time using one IESM 110. According to an embodiment, the electrodes 120 are formed in the upper and lower portions of the IESM 110, and the IDEs 320 are formed in the other regions of the IESM 110, thereby generating electricity and sensing humidity. I can.

The self-generating humidity sensor according to an exemplary embodiment does not require an additional battery, and thus may be usefully used in the wearable field. In the present disclosure, it has been described that the humidity sensor is used, but other sensors or other devices using the IESM may be implemented together with the power generation apparatus using the IESM. That is, various self-powered sensors or self-powered devices using IESM may be implemented.

The above contents may be modified and modified without departing from the essential characteristics of the present invention by those of ordinary skill in the technical field to which the present invention pertains. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

100: electricity generating device
110: Nanmak
120: electrode
130: sealing part
200: resistance
300: humidity sensing device
320: interdigital electrode

Claims (10)

Egg membrane; And
A humidity sensor comprising an interdigital electrode formed on the egg membrane.
The method of claim 1,
The egg membrane is a humidity sensor that is an egg egg membrane.
The method of claim 1,
A humidity sensor having the same finger width and spacing width of the interdigital electrode.
The method of claim 3,
The finger width and the spacing width is 100 μm humidity sensor.
The method of claim 1,
The humidity sensor is a humidity sensor that does not have a separate substrate.
The method of claim 1,
The egg membrane is a humidity sensor that functions as an active sensing layer and a substrate.
The method of claim 1,
Humidity sensor capable of sensing humidity by both impedance response and capacitance response.
The method of claim 1,
A humidity sensor in which the egg membrane functions as electricity generation power.
The method of claim 8,
A humidity sensor generating triboelectric electricity in a region in the egg membrane where the interdigital electrode is not located.
The method of claim 8,
Two electrodes respectively positioned above and below the egg membrane; And
Humidity sensor further comprising a sealing portion for sealing the two electrodes.

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