CN108444952B - Graphene array detection unit, preparation method thereof and detection conversion device - Google Patents
Graphene array detection unit, preparation method thereof and detection conversion device Download PDFInfo
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Abstract
The invention relates to a graphene array detection unit, a preparation method thereof and a detection conversion device, wherein the detection conversion device comprises a rotating shaft, a plurality of detection units which are uniformly distributed along the circumferential direction of the rotating shaft, and a connecting rod for connecting the detection units and the rotating shaft, and the detection units comprise: the device comprises an external fixing frame, high-transmittance glass, low-transmittance glass and a graphene cross array structural plate; the invention also relates to a preparation method of the detection unit, and the detection unit generates different transmission spectral lines through the graphene cross array structural plates with the micro-nano structures at different included angles. The detection unit is driven to rotate by the rotation of the rotating shaft, so that wavelength differences corresponding to the transmission valley positions of a plurality of transmission spectral lines can be obtained, a plurality of logic conditions can be screened by the wavelength differences corresponding to the transmission valley positions, a plurality of logic operations can be realized, the detection unit can be used as a logic switch, the operation is convenient, and the dynamic change adjustment is facilitated.
Description
Technical Field
The invention belongs to the technical field of automatic control, and particularly relates to a graphene array detection unit, a preparation method thereof and a detection conversion device.
Background
A logic switch (or called a pressure logic switch) is a control instrument widely used in an automatic control system. Logic switches are commonly used to measure the pressure or temperature of a fluid, such as a gas or liquid. When the pressure or temperature of the measured fluid is higher or lower than the rated value, the logic switch can correspondingly act to change the on-off state of the micro switch contained in the logic switch, thereby achieving the purpose of automatic control.
The existing logic switch is mainly designed in a mechanical mode, a circuit mode and a PN junction mode so as to judge the related rated value and make corresponding action.
Disclosure of Invention
The invention provides a graphene array detection unit, a preparation method thereof and a detection conversion device. The technical problem to be solved by the invention is realized by the following technical scheme: a graphene array detection unit comprises an external fixing frame, upper high-transmittance glass, lower high-transmittance glass and a graphene cross array structural plate; the graphene cross-shaped array structure plate is positioned between upper high-transmittance glass and lower high-transmittance glass, and the upper high-transmittance glass and the lower high-transmittance glass are fixed through an external fixing frame;
the included angles of the single graphene crosses in the graphene cross arrays of the graphene cross array structure plate are the same, and the included angle alpha of the single graphene cross is [0 degrees and 90 degrees ].
A preparation method of a graphene array detection unit comprises the following steps:
and 5, repeating the steps 1 to 4, and preparing the graphene cross array structure plate with the graphene cross array structure and different included angles alpha.
A graphene array detection conversion device comprises a rotating shaft, a plurality of detection units and a connecting rod, wherein the detection units are uniformly distributed along the circumferential direction of the rotating shaft;
the detection unit includes: the device comprises an external fixing frame, high-transmittance glass, low-transmittance glass and a graphene cross array structural plate; the graphene cross-shaped array structure plate is clamped between upper high-transmittance glass and lower high-transmittance glass, and the upper high-transmittance glass and the lower high-transmittance glass are fixed through an external fixing frame;
the included angle alpha of the single graphene cross of the graphene cross array structural plate is [0 degrees and 90 degrees ];
the included angle alpha of each graphene cross of the graphene cross array structure plate is the same, and the included angles alpha of the graphene cross arrays of the graphene cross array structure plates of different detection units are different.
Furthermore, the number of the detection units is four, and the detection units are symmetrically arranged in a cross shape.
Further, the wavelength difference corresponding to two transmission valley positions of the transmission spectrum line of the intermediate infrared band of the graphene cross-shaped array structure plate is Δ λ, and when the included angle α is 50 °, the wavelength difference Δ λ corresponding to the included angle α is Δ λ503.62 μm, the wavelength difference Δ λ corresponding to the included angle α of 60 ° is Δ λ602.38 μm, the wavelength difference Δ λ corresponding to the included angle α of 70 ° is Δ λ701.50 μm, the wavelength difference Δ λ corresponding to the included angle α of 90 ° is Δ λ90＝0μm；
When Delta lambda is more than or equal to Delta lambda50Executing a first logic operation A;
when Δ λ ∈ (Δ λ)50，Δλ60]Executing a second logic operation B;
when Δ λ ∈ (Δ λ)60，Δλ70]Executing a third logic operation C;
when Δ λ ∈ (Δ λ)70，Δλ90]Executing a fourth logic operation D;
when Δ λ ∈ (Δ λ)90，0]Executing a fifth logic operation E;
when the fermi energy increases when the angle α is 90 °, the fermi level EfWhen the values are 0.4ev, 0.5ev and 0.6ev, three logic operations can be executed;
when the included angle α is 70 °, 60 ° or 50 °, the angle is not changedEnergy level E of ricefNine logical operations can be executed when the values of 0.4ev, 0.5ev and 0.6ev are taken.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the graphene cross array structural plate with the micro-nano structure can generate the transmission spectral line with two transmission valleys, so that the wavelength difference corresponding to the transmission valley position of the transmission spectral line can be obtained, and condition screening can be carried out through the wavelength difference corresponding to the transmission valley position.
The detection unit is driven to rotate through the rotation of the rotating shaft, the detection unit converts incident light to generate transmission spectral lines with different effects, so that wavelength differences corresponding to the transmission valley positions of a plurality of transmission spectral lines can be obtained, a plurality of logic conditions can be screened through the wavelength differences corresponding to the transmission valley positions, a plurality of logic operations can be realized, the detection device can be used as a logic switch, the operation is convenient, and the dynamic change adjustment is facilitated.
3, the detection unit mainly comprises a graphene array, and the transmission curve of the graphene array can be regularly changed by changing the Fermi level of the graphene, so that different logic transformations can be realized in the same detection unit.
Drawings
FIG. 1 is a schematic diagram of a single graphene cross array structure;
FIG. 2 is a schematic view of a detecting unit;
FIG. 3 is a schematic structural diagram of the detection conversion device;
FIG. 4 is a schematic structural diagram of a use state of the detection and conversion device;
FIG. 5 is a schematic view of the detection assembly;
FIG. 6 is a schematic diagram of transmission lines corresponding to the change of the included angle α of the graphene cross-shaped array structure;
fig. 7 is a schematic diagram of transmission lines corresponding to the change of fermi levels of the graphene cross array structure.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1:
as shown in fig. 1, the present embodiment provides a graphene array detection unit, which includes an external fixing frame 4-1, an upper high-transmittance glass 4-2, a lower high-transmittance glass 4-3, and a graphene cross array structure plate 4-4; the graphene cross-shaped array structure plate 4-4 is positioned between the upper high-transmittance glass 4-2 and the lower high-transmittance glass 4-3, and the upper high-transmittance glass 4-2 and the lower high-transmittance glass 4-3 are fixed through an external fixing frame 4-1; the included angles of the single graphene crosses in the graphene cross arrays of the graphene cross array structural plates 4-4 are all the same, and the included angle alpha of the single graphene cross is [0 degrees, 90 degrees ].
As shown in fig. 2, when the structural parameters of the graphene cross array structural plate 4-4 are: l is1＝L2＝55nm，d1＝d2When the included angle α is changed only without changing 40nm, transmission lines with two transmission valleys with different effects are generated, as shown in fig. 6, transmission lines corresponding to the mid-infrared bands when the included angle α is changed from 90 ° to 70 °, 60 ° and 50 ° respectively, where Δ λ is defined herein to represent the wavelength difference corresponding to the two transmission valleys in the transmission lines, and when the included angle α is different, different transmission lines are generated, the wavelength difference corresponding to the transmission valleys is different, so that screening under different conditions can be performed according to the different wavelength differences corresponding to the transmission valleys.
Example 2:
the embodiment provides a preparation method of a graphene array detection unit, which comprises the following steps:
the method comprises the following specific steps:
preparing ITO glass as a substrate, putting the ITO glass into a washing solution for washing, performing ultrasonic treatment on the ITO glass for 15min by using deionized water, performing ultrasonic treatment on the ITO glass for 15min by using acetone, performing ultrasonic treatment on the ITO glass for 15min by using alcohol, performing ultrasonic treatment on the ITO glass for 5min by using deionized water, and finally drying the ITO glass by using a nitrogen gun and putting the ITO glass into a nitrogen cabinet for later use.
The graphene oxide material is prepared by a Hummers method. 10g of graphite powder (the size is less than 150um) and 230ml of concentrated sulfuric acid with the mass concentration of 98 percent are added into a 1000ml three-mouth bottle under the condition of ice-water bath at the temperature of 0 ℃. Then 30g of potassium permanganate is added into the three-mouth bottle within 1 hour for 10 times, and the reaction temperature is controlled within 20 ℃. After the addition was completed, the reaction was continued for 1 hour with stirring. Then 700ml of deionized water was slowly added to the three-necked flask, and the mixture was stirred at about 38 ℃ for 2 hours. The mixture was then transferred to a 2000ml beaker and usedAfter diluting the reaction mixture with 1.5L of deionized water, 25ml of H was added2O2At this time, the reaction solution turned from yellow brown to golden yellow. Filtering while hot, washing with 5% HCl solution and deionized water, and dialyzing in distilled water until there is no SO in the filtrate4 2-(with BaCl)2Solution test), Cl free-(with AgNO)3Solution test). And centrifuging at 4000rpm to remove a small amount of unoxidized natural graphite particles, wherein the obtained graphite oxide is sticky and brown. At P2O5And drying the graphene oxide film in vacuum at 60 ℃ for 24 hours in the presence of the solvent to obtain the graphene oxide.
And (3) dispersing graphene oxide in deionized water at the concentration of 3mg/ml, and performing ultrasonic dispersion to obtain a graphene oxide solution. Selecting ITO glass with the thickness of 170um as a substrate, spin-coating the graphene oxide solution on the surface of the ITO glass substrate at 1000rpm, and spin-coating for 10 times, so as to obtain a graphene oxide film with the thickness of 50nm on the substrate.
and 4, fixing the graphene cross array structural plate 4-4 between the upper high-transmittance glass 4-2 and the lower high-transmittance glass 4-3, and fixing the upper high-transmittance glass 4-2 and the lower high-transmittance glass 4-3 through an external fixing frame 4-1 to prepare the detection unit.
And 5, repeating the steps 1 to 4 to prepare the graphene cross array structure plates 4-4 with different included angles alpha of the graphene cross array structures, so as to obtain different detection units.
Example 3:
as shown in fig. 3, this embodiment provides a graphene array detection conversion device, including pivot 3, along 3 circumference evenly distributed's of pivot a plurality of detecting element 4, be used for hookup detecting element and pivot 3 connecting rod 7, the one end and the pivot 3 of connecting rod 7 are connected, and is concrete, and the one end of connecting rod 7 is connected with the circumference lateral wall of pivot 3, and the other end and the detecting element 4 of connecting rod 7 are connected. The rotation of the rotating shaft 3 can drive the detection unit 4 to rotate, so that a plurality of different detection units can be detected one by one, one detection unit can execute one condition after detection, and the aim of screening different conditions can be fulfilled. The detection unit 4 converts the transmission spectral lines for realizing different effects of incident light, so that wavelength differences corresponding to the transmission valley positions of a plurality of transmission spectral lines can be obtained, logical condition screening can be performed through the wavelength differences corresponding to the transmission valley positions, a plurality of groups of detection conversion devices can realize a plurality of logical operations, can be used as logical switches, are convenient to operate and are beneficial to realizing dynamic change adjustment.
The detection unit 4 includes: the device comprises an external fixing frame 4-1, upper high-transmittance glass 4-2, lower high-transmittance glass 4-3 and a graphene cross array structural plate 4-4; the graphene cross-shaped array structure plate 4-4 is clamped between the upper high-transmittance glass 4-2 and the lower high-transmittance glass 4-3, and the upper high-transmittance glass 4-2 and the lower high-transmittance glass 4-3 are fixed through an external fixing frame 4-1;
the included angle alpha of the single graphene cross of the graphene cross array structural plate 4-4 is [0 degrees, 90 degrees ];
the included angles α of each of the graphene crosses of the graphene cross arrays of the graphene cross array structure plates 4-4 are the same, that is, the included angles α of each of the graphene crosses of the graphene cross arrays in the same detection unit 4 are the same, and the included angles α of the graphene crosses of the graphene cross arrays of the graphene cross array structure plates 4-4 of different detection units 4 are different.
In this embodiment, as shown in fig. 4 and 5, when the detection conversion device is used as a logic switch, the logic switch further includes a detection assembly 1, and the detection assembly 1 includes a transmitting unit 5 and a receiving unit 6; the transmitting unit 5 and the receiving unit 6 are correspondingly arranged, the detection conversion assembly 2 comprises a connecting rod 7 and a detection unit 4, and a gap for the detection conversion assembly 2 to pass through is arranged between the transmitting unit 5 and the receiving unit 6. When the emitting unit 5 generates circularly polarized light and irradiates the detecting unit 4, the receiving unit 6 measures the transmittance of the circularly polarized light, and the logic condition screening is performed according to the wavelength difference corresponding to the transmission valley of the transmission spectrum line, so that the logic operation function is realized, and the logic switch function is realized. The detection unit 4 can perform logical operation judgment once per conversion, and the detection conversion device can realize various logical operations.
When the external condition changes, the detection conversion assembly 2 rotates, the detection units 4 in the transmitting unit 5 and the receiving unit 6 are replaced by the next gear, and then a logic operation is performed through the transmission spectrum characteristics.
Further, the number of the detection units 4 is four, and the detection units are symmetrically arranged in a cross shape. Four detection units 4 are made by using corresponding graphene cross array structural plates 4-4, and every two detection units 4 are positioned on one side of the cross. In each detection unit 4, the included angle α of each graphene cross of the graphene cross array structural plate 4-4 is the same, and the included angle α takes four values and respectively corresponds to different detection units 4.
As shown in fig. 6, when the structural parameters of the graphene cross array graphene cross of the graphene cross array structural plate 4-4 are: l is1＝L2＝55nm，d1＝d2When the included angle α is changed only, transmission lines with two transmission valleys with different effects are generated, as shown in the figure, when the included angle α is changed from 90 degrees to transmission lines corresponding to the mid-infrared bands at 70 degrees, 60 degrees and 50 degrees, respectively, and the changes of L and d have no influence on the wavelength difference of the two transmission valleys of the transmission lines generated by the graphene cross array structural plate 4-4.
The wavelength difference corresponding to the two transmission valley positions of the transmission line is defined as delta lambda, and the wavelength difference delta lambda corresponding to the included angle α of 50 degrees is defined as delta lambda503.62 μm, the wavelength difference Δ λ corresponding to an included angle α of 60 ° is Δ λ602.38 μm, the wavelength difference Δ λ corresponding to an included angle α of 70 ° is Δ λ701.50 μm, the wavelength difference Δ λ corresponding to an included angle α of 90 ° is Δ λ90＝0μm；
When delta lambda≥Δλ50Executing a first logic operation A;
when Δ λ ∈ (Δ λ)50，Δλ60]Executing a second logic operation B;
when Δ λ ∈ (Δ λ)60，Δλ70]Executing a third logic operation C;
when Δ λ ∈ (Δ λ)70，Δλ90]Executing a fourth logic operation D;
when Δ λ ∈ (Δ λ)90，0]The fifth logic operation E is performed.
Different angle values of the included angle alpha can generate different wavelength differences delta lambda, the wavelength differences delta lambda have a decreasing trend along with the increase of the angle, and a certain corresponding logic operation can be executed through the judgment principle.
Based on the above judgment principle, the working mode of the logic switch based on the detection conversion device is as follows: when the emitting unit 5 generates circularly polarized light and irradiates the detecting unit 4, the receiving unit 6 measures the transmittance of the circularly polarized light, and the logic condition screening is performed according to the wavelength difference corresponding to the transmission valley of the transmission spectrum line by the judgment principle, so that the logic operation function is realized, and the logic switch function is realized. The receiving unit is connected with a processing unit, which can be a control chip or a computer, and processes the signal of the receiving unit.
As shown in fig. 7, when the fermi energy increases at angle α of 90 °, a blue shift in the position of the transmission valley of the transmission line occursfF, G, H logic operations can be executed at 0.4ev, 0.5ev and 0.6 ev.
An angle α corresponds to a fermi level E when the angle α is 70 °, 60 °, or 50 °fWhen the values are 0.4ev, 0.5ev and 0.6ev, nine logic operations can be additionally executed.
In this embodiment, two or more groups of detection and conversion devices can be used to implement multiple combinational logic operations, so that the number of executable logic operations is increased: for example, when two sets of detection and conversion devices are provided, the wavelength differences corresponding to the positions of the transmission valleys are combined as basic logic, the first set can perform A, B, C or D logic operation, the second set can perform A, B, C or D logic operation, and sixteen kinds of logic operation of AA, AB, AC, AD, BA, BB, BC, BD, CA, CB, CC, CD, DA, DB, DC or DD logic operation can be performed after combination, and so on, various kinds of logic operation can be performed in combination, and the number of logic operation is increased.
In addition, one group takes the wavelength difference corresponding to the position of the transmission valley as basic logic, and the other group takes the Fermi level as basic logic for combination, namely, various combinational logic operations can be executed. For example, when two sets of detection conversion devices are provided, the first set uses the wavelength difference corresponding to the transmission valley position as basic logic, the second set uses the wavelength difference and the fermi level as basic logic, the two sets are combined, the first set can perform logical operation A, B, C, D, each of the four detection units in the second set can perform three logical operations, i.e., a1, a2, A3, B1, B2, B3, C1, C2, C3, D1, D2 and D3, and the first set and the second set can be combined in any number of sets to perform logical operation. More than three groups of detection conversion devices can be combined to execute more logic operations, and by analogy, more logic operations can be combined to execute, so that the number of logic operations is increased.
For more than two groups of detection conversion devices, various logic operation combinations can be performed by analogy.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (3)
1. A graphene array detects conversion equipment which characterized in that: the device comprises a rotating shaft (3), a plurality of detection units (4) which are uniformly distributed along the circumferential direction of the rotating shaft (3), and a connecting rod (7) for connecting the detection units and the rotating shaft (3), wherein one end of the connecting rod (7) is connected with the rotating shaft (3), and the other end of the connecting rod (7) is connected with the detection units (4);
the detection unit (4) comprises: the device comprises an external fixing frame (4-1), upper high-transmittance glass (4-2), lower high-transmittance glass (4-3) and a graphene cross array structure plate (4-4); the graphene cross-shaped array structure plate (4-4) is clamped between upper high-transmittance glass (4-2) and lower high-transmittance glass (4-3), and the upper high-transmittance glass (4-2) and the lower high-transmittance glass (4-3) are fixed through an external fixing frame (4-1);
the included angle alpha of the single graphene cross of the graphene cross array structural plate (4-4) is [0 degrees, 90 degrees ];
the included angle alpha of each graphene cross of the graphene cross array structure plate (4-4) is the same, and the included angles alpha of the graphene crosses of the graphene cross array structure plates (4-4) of different detection units (4) are different.
2. The graphene array detection conversion device according to claim 1, wherein: the number of the detection units (4) is four, and the detection units are symmetrically arranged into a cross shape.
3. The graphene array detection conversion device according to claim 2, wherein the wavelength difference between two transmission valley positions of the transmission line of the intermediate infrared band of the graphene cross-shaped array structural plate (4-4) is Δ λ, and the wavelength difference Δ λ corresponding to the included angle α of 50 ° is Δ λ503.62 μm, the wavelength difference Δ λ corresponding to the included angle α of 60 ° is Δ λ602.38 μm, the wavelength difference Δ λ corresponding to the included angle α of 70 ° is Δ λ701.50 μm, the wavelength difference Δ λ corresponding to the included angle α of 90 ° is Δ λ90＝0μm；
When Delta lambda is more than or equal to Delta lambda50Executing a first logic operation A;
when Δ λ ∈ (Δ λ)50，Δλ60]Executing a second logic operation B;
when Δ λ ∈ (Δ λ)60，Δλ70]Executing a third logic operation C;
when Δ λ ∈ (Δ λ)70，Δλ90]Performing a fourth logical operationD；
When Δ λ ∈ (Δ λ)90，0]Executing a fifth logic operation E;
when the fermi energy increases when the angle α is 90 °, the fermi level EfWhen the values are 0.4ev, 0.5ev and 0.6ev, three logic operations can be executed;
a fermi level E when said angle α is 70 °, 60 ° or 50 °fNine logical operations can be executed when the values of 0.4ev, 0.5ev and 0.6ev are taken.
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