CN106413358A - Electromagnetic shielding optical window based on graphene/transparent conductive film composite structure - Google Patents
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Abstract
An electromagnetic shielding optical window based on a graphene/transparent conductive film composite structure belongs to the optical transparent member electromagnetic shielding technology field, and organically combines the low-reflection and partial absorption microwave characteristics of the graphene mesh films with the strong electromagnetic reflection characteristics of the high-light transmission conductive films, thereby forming a multilayer structure. The transparent conductive films are used as the transparent reflection layers, and 1-6 layers of graphene films separated by the transparent mediums are used as the transparent absorption layers. By the structure, the radio frequency radiation can penetrate the transparent absorption layers repeatedly to be absorbed strongly, so that the strong electromagnetic shielding and low electromagnetic reflection characteristics are realized, and the visible light has a high light transmission rate by transmitting the multilayer structure once. The electromagnetic shielding optical window of the present invention solves the problem that a conventional transparent electromagnetic shielding method can not consider the low-electromagnetic reflection, the strong electromagnetic shielding and the high light transmission simultaneously, and has the characteristics of high light transmission, strong electromagnetic shielding and low electromagnetic reflection.
Description
Technical field
The invention belongs to optical clear part electromagnetic shielding field, particularly to a kind of electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction.
Background technology
With the development of broadcast, TV, wireless communication technique and microwave technology, radio-frequency apparatus are equipped in a large number in each place of mankind's activity, and the continuous broadening of spectral range, and intensity is multiplied, and this not only interferes to electronic equipment, also health are produced and threaten.This invisible impalpable " electromagnetic pollution " directly acts on machine or human body, is to endanger serious " stealthy killer ", it has also become the fifth-largest pollution after atmospheric pollution, water pollution, noxious waste pollution and sound pollution.Electromagnetic shielding（Including absorption and reflection）It is the major measure of preventing and treating electromagnetic pollution, in recent years, electromangnetic spectrum gets more and more people's extensive concerning.The electromagnetic shielding wherein needing visual observation occasion is transparency electromagnetic wave shield, it is all difficult point and focus, Medical electromagnetic isolation room observation window, communication apparatus transparency electromagnetic wave shield element, Aero-Space equipment optical window, advanced optical instrument optical window, secured facilities anti-electromagnetic exposure optical window, LCDs, mobile phone touch, vehicle-mounted transparent antenna etc. are covered in its application all the time.
At present, realizing the difficult point of transparency electromagnetic wave shield, to essentially consist in traditional absorbing material mostly opaque or transparent very poor, and conditioned each other it is difficult to realize high transparent and forceful electric power magnetic shield simultaneously based on the transparency and conductive shield ability in the reflective transparent shield technology of transparent conductive material or device.Additionally, between ELECTROMAGNETIC RADIATION REFLECTION is made the return trip empty by conducting reflective Transparent shielding technology, causing " secondary pollution " to spatial environmentss, being unfavorable for the thorough preventing and treating of electromagnetic pollution.
In a lot of fields of modern technologies, material with carbon element all plays very important role, and in numerous allotropes of carbon, Graphene is the very typical material of one kind, and Graphene is with sp by carbon atom2Hybrid orbital forms the flat film that hexangle type is in honeycomb lattice, it is the two-dimensional material of only one of which carbon atom thickness, there is many-sided excellent property, one of prominent property is that have excellent transparent conductivity, also there is certain microwave absorbing property, this makes Graphene have very high using value in transparency electromagnetic wave shield field：
1.
United States Patent (USP) US20130068521 " Electromagnetic shielding
method using graphene and electromagnetic shiedling
Material " is loaded on metallic plate, is realized electromagnetic shielding on polymer substrate using Graphene prepared by chemical vapour deposition technique (CVD); compared with the metallic plate not loading Graphene, polymer substrate; after loading Graphene, integrally-built electromagnetic shielding efficiency increases.
2. patent 201310232829. X " for shielding the structures and methods based on Graphene of electromagnetic radiation " describes a kind of electromagnetic armouring structure being more than 1 megahertz of electromagnetic radiation for screening frequencies, this structure is made up of one or more layers Graphene, and at least one of which Graphene is doped with dopant.
3. patent 201420099425.8 " a kind of transparency electromagnetic wave shield film based on graphene film " describes a kind of transparency electromagnetic wave shield film of nano-silver thread of arranging between transparent substrates and graphene film, nano-silver thread plays electric charge bridge beam action, increase the electric conductivity of whole electromagnetic shielding film, improve shield effectiveness.
4. the metallic mesh that James M. Tour of Rice Univ USA (Rice University) et al. is 5 μm with photoetching process prepares line bar width, and single-layer graphene is shifted on its surface, it is made for Graphene metallic mesh mixed conductor membranes（James M. Tour etc., " Rational Design of Hybrid
Graphene Films for High-Performance Transparent Electrodes ". ACS Nano, 2011,5 (8)：6472~6479）, this mixed conductor membranes can achieve 90% light transmittance and the sheet resistance of 20 Ω/sq.
5. the shield effectiveness that Seul Ki Hong of Korea Advanced Institute of Science and Technology (KAIST) et al. reports single-layer graphene is 2.27dB（Hong S K etc., " Electromagnetic
interference shielding effectiveness of monolayer graphene”. Nanotechnology, 2012,
23(45)：455704）, wherein absorption loss and reflection loss respectively -4.38dB and -13.66dB.
6. Korea S Cheng Jun shop university (Sungkyunkwan
University Kim S) and Samsung Motor Corporation of Korea S (Samsung
Electro-Mechanics Myeong-Gi Kim) et al. adopts Graphene (PEI/RGO) stepped construction of Polyetherimide/oxidation-reduction method preparation to realize electromagnetic shielding（Kim S etc., " Electromagnetic Interference (EMI) Transparent Shielding of
Reduced Graphene Oxide (RGO) Interleaved Structure Fabricated by
Electrophoretic Deposition”. ACS applied materials & interfaces, 2014, 6(20)：17647-17653）, the electromagnetic shielding efficiency of double-deck PEI/ RGO and monolayer PEI/ RGO stepped construction is respectively 6.37 dB and 3.09dB, and absorption loss accounts for the ratio respectively 96% and 92% of total electromagnetic shielding efficiency.
Graphene is used for electromagnetic shielding by above-mentioned each scheme, it is possible to achieve certain effectiveness.United States Patent (USP) US20130068521 adopts Graphene as the core devices of electromagnetic screen, and large-area for full wafer Graphene is transferred to by metal by the Graphene transfer method of roll-to-roll, on polymer substrate, achieve excellent effectiveness, but this electromagnetic shielding device does not have the transparency.Patent 201310232829. X " for shielding the structures and methods based on Graphene of electromagnetic radiation " is using graphene film as the main body of electromagnetic armouring structure, and wherein at least one layer graphene thin film is doped to improve electromagnetic shielding efficiency, but doping can affect integrally-built light transmittance.Patent 201420099425.8 " a kind of transparency electromagnetic wave shield film based on graphene film " utilizes nano-silver thread to improve the electrical conductivity of graphene film, increase the raising that reflection loss realizes electromagnetic shielding efficiency, but the main contributions of electromagnetic shielding are produced by reflection.In above-mentioned document 4, graphene film is loaded on formation Graphene and metallic mesh on metallic mesh and fit tightly structure, this arrangement enhances the electric conductivity of metallic mesh, light transmittance reaches 91%, but the electromagnetic shielding of this structure is based on reflecting simultaneously.In above-mentioned document 5, result of study shows, although the shield effectiveness of Graphene increases with the number of plies and is significantly increased, absorption loss increases seldom, and often increases by a layer graphene, transmission loss 2.3% is so that this structure is difficult to realize high printing opacity, low reflection and forceful electric power magnetic shield simultaneously.The graphene film (RGO) adopting oxidation-reduction method preparation in above-mentioned document 6 realizes electromagnetic shielding with Polyetherimide (PEI) stepped construction, and shield based on absorption loss, but the shield effectiveness of double-deck PEI/RGO structure is only 6.37dB, and light transmittance is only 62% it is difficult to realize forceful electric power magnetic shield and high printing opacity simultaneously.
In a word, in existing electromangnetic spectrum, the method based on reflection-type electromagnetic shielding easily causes secondary electromagnetic pollution；And there is the electromagnetic shielding method of absorption loss, or it is not high to there is light transmittance, or electromagnetic shielding efficiency strong it is difficult to realize high transparent and forceful electric power magnetic shield simultaneously.
Content of the invention
It is an object of the invention to overcoming the shortcomings of above-mentioned existing transparency electromagnetic wave shield technology, mutually restrict especially for the transparency and conductive shield ability in existing reflective transparent shield technology, it is difficult to take into account high transmission rate and strong micro-wave screening efficiency, and reflected electromagnetic signal causes the problem of electromagnetic exposure and secondary pollution, research and develop a kind of electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction, reach the purpose being provided simultaneously with high printing opacity, low ELECTROMAGNETIC REFLECTION and forceful electric power magnetic shield performance.
The object of the present invention is achieved like this：Based on the electromagnetic shielding optical window of Graphene/transparent conductive film composite construction, described electromagnetic shielding optical window is made up of the transparent absorbent layer of overlap and configured in parallel successively, transparent medium and transparent reflecting layer assembling；Described transparent absorbent layer is made up of the graphene film that 1-6 layer is separated by transparent medium, and transparent reflecting layer is made up of transparent conductive film, including transparent metal compound thin film, nano-silver thread thin film or metallic mesh.
The good result that the present invention produces focuses primarily upon realization and is provided simultaneously with high printing opacity, low ELECTROMAGNETIC REFLECTION and forceful electric power magnetic shield performance, specific as follows：
Using the Microwave Absorption Properties of Graphene and the Microwave reflection characteristics of transparent conductive film, the two is organically combined, using transparent conductive film as transparent reflecting layer, realize the forceful electric power magnetoreflection to radio-frequency radiation；The graphene film structure being separated by transparent medium with 1-6 layer, as transparent absorbent layer, can make radio-frequency radiation partially absorb and be passed through in the form of low reflection；After transparent reflection is placed on transparent absorbent layer, both ensure to realize forceful electric power magnetic shield, make to return transparent absorbent layer through the microwave strong reflection of transparent absorbent layer again, so that radio-frequency radiation is partially absorbed and passed through in the form of low reflection, finally realize the forceful electric power magnetic shield of low reflection；The stepped construction of the present invention, on the one hand due to the presence of transparent absorbent layer, solve the problems, such as that the shielding based on reflection during only transparent conductive film easily causes secondary pollution, on the other hand after due to the presence of transparent reflecting layer and being placed in transparent absorbent layer, make shield microwaves through reflection and multiple absorption, when solving the problems, such as to only exist graphene film transparent absorbent layer, shield effectiveness is not high, meanwhile, for light wave, only transmit transparent absorbent layer and transparent reflecting layer once, the loss that it occurs is less, can achieve high light transmission features.
To sum up, the present invention can realize being provided simultaneously with the most prominent effect that high printing opacity, low ELECTROMAGNETIC REFLECTION and forceful electric power magnetic shield performance are the present invention.
Brief description
Fig. 1 is the generalized section of the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction.
Fig. 2 is the grid unit arrangement mode structural representation of grid metallic mesh.
Fig. 3 is the grid unit arrangement mode structural representation of annulus metallic mesh.
Fig. 4 is the grid unit arrangement mode structural representation of multicycle micro-loop metallic mesh.
Fig. 5 is the generalized section of the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction described in embodiment.
Fig. 6 is the structural representation of the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction described in embodiment.
In figure piece number explanation：1. protective layer A 2. anti-reflection film A 3. transparent absorbent layer 4. transparent medium 5. transparent reflecting layer 6. anti-reflection film B 7. protective layer B 8. graphene film A, 9. transparent medium A, 10. graphene film B 11. micro-loop metallic mesh.
Specific embodiment
Below in conjunction with the accompanying drawings embodiment of the present invention is described in detail：
Described electromagnetic shielding optical window is made up of the transparent absorbent layer 3 of overlap and configured in parallel successively, transparent medium 4 and transparent reflecting layer 5 assembling；Described transparent absorbent layer 3 is made up of the graphene film that 1-6 layer is separated by transparent medium, and transparent reflecting layer 5 is made up of transparent conductive film, including transparent metal compound thin film, nano-silver thread thin film or metallic mesh.
The protective layer A1 of the anti-reflection film A2 of configured in parallel single or multiple lift and single or multiple lift successively on transparent absorbent layer 3 lateral part；The protective layer B7 of the anti-reflection film B6 of configured in parallel single or multiple lift and single or multiple lift successively on transparent reflecting layer 5 lateral part.
Constitute the number of plies of Graphene that the graphene film of transparent absorbent layer 3 comprises be monolayer, double-deck or three layers, and the Graphene number of plies that the graphene film that separated by transparent medium of each layer comprises can be identical or different.
The light transmittance of transparent reflecting layer 5 is more than 90%.
If transparent reflecting layer 5 is made up of metallic mesh, described metallic mesh is made up of by the two-dimension plane structure of periodic arrangement grid unit, the cycle of grid unit is submillimeter to millimeter magnitude, metal wire width is submicron to micron dimension, the connection metal being overlapped by metal wire between adjacent grid unit or connecting two metal line bars in the setting of overlapping place.
If transparent reflecting layer 5 is made up of metallic mesh, metallic mesh is made up of the good alloy material of electric conductivity, and alloy thickness is more than 100nm.
The transparent medium making material of described transparent medium 4 and separation transparent absorbent layer 3 graphene film includes simple glass, quartz glass, infra-red material and transparent resin material.
The electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction of the present invention, transparent reflecting layer 5 is the core devices realizing strong reflection electromagnetic shielding, and transparent absorbent layer 3 has the low characteristic reflecting and partially absorb microwave.The transparent reflecting layer 5 constituting with respect to transparent conductive film, is placed in the side closer to radio-frequency radiation wave source by the transparent absorbent layer 3 that the graphene film being separated by transparent medium parallel stacking arrangement is constituted.The radio-frequency radiation energy being irradiated to optical window enters transparent absorbent layer 3, energy after layer graphene each in transparent absorbent layer 3 absorbs, decays is by transparent reflecting layer 5 high reflection, radio-frequency radiation after reflection is again through transparent absorbent layer 3, again pass by the attenuation by absorption of each layer graphene, and radio-frequency radiation experiences multiple reflections and absorption in the reflecting part of each graphene film layer and transparent dielectric layer, the most energy finally making radio-frequency radiation are absorbed, and realize the electromagnetic shielding based on absorbing.And the optical region that needs are passed through, merely through transparent absorbent layer 3 once with transparent reflecting layer 5 once, the loss that it occurs is less, enables high printing opacity.
Embodiment
Electromagnetic shielding optical window is made up of the transparent absorbent layer 3 of overlap and configured in parallel successively, transparent medium 4 and transparent reflecting layer 5 assembling；Described transparent absorbent layer 3 is made up of the graphene film B10 of the graphene film A8, transparent medium A9 and monolayer of the monolayer of configured in parallel successively, and transparent reflecting layer is made up of micro-loop metallic mesh 11.
The solution have the advantages that：When the electromagnetic shielding efficiency of metallic mesh is 19.0dB, the electromagnetic shielding efficiency of the present invention is 23.2dB, and absorption loss accounts for the 58.0% of total shielding energy it is achieved that forceful electric power magnetic shield based on absorbing, and light transmittance is 90.4%, still has high light transmission features.
The also corresponding in addition several embodiments of the present invention, metallic mesh in Fig. 5 is changed to transparent conductive metal compound film or nano-silver thread thin film, and keeps original each layer arrangement mode constant, finally also can obtain similar effects；On the basis of the transparent absorbent layer being made up of the single-layer graphene that two-layer is separated in Figure 5, increase or decrease the quantity of the single-layer graphene film being separated by transparent medium, the increase of absorption loss or the raising of light transmittance will be led to, can adjust accordingly according to actual needs.
Claims (7)
1. the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction it is characterised in that：Described electromagnetic shielding optical window is made up of the transparent absorbent layer (3) of overlap and configured in parallel successively, transparent medium (4) and transparent reflecting layer (5) assembling；Described transparent absorbent layer (3) is made up of the graphene film that 1-6 layer is separated by transparent medium, and transparent reflecting layer (5) is made up of transparent conductive film, including transparent metal compound thin film, nano-silver thread thin film or metallic mesh.
2. the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction according to claim 1 it is characterised in that：The protective layer A (1) of the anti-reflection A (2) of configured in parallel single or multiple lift and single or multiple lift successively on transparent absorbent layer (3) lateral part；The protective layer B (7) of the anti-reflection film B (6) of configured in parallel single or multiple lift and single or multiple lift successively on transparent reflecting layer (5) lateral part.
3. the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction according to claim 1 it is characterised in that：Constitute the number of plies of Graphene that the graphene film of transparent absorbent layer (3) comprises be monolayer, double-deck or three layers, and the Graphene number of plies that the graphene film that separated by transparent medium of each layer comprises can be identical or different.
4. the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction according to claim 1 it is characterised in that：The light transmittance of transparent reflecting layer (5) is more than 90%.
5. the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction according to claim 1 it is characterised in that：If transparent reflecting layer (5) is made up of metallic mesh, described metallic mesh is made up of by the two-dimension plane structure of periodic arrangement grid unit, the cycle of grid unit is submillimeter to millimeter magnitude, metal wire width is submicron to micron dimension, the connection metal being overlapped by metal wire between adjacent grid unit or connecting two metal line bars in the setting of overlapping place.
6. the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction according to claim 1 it is characterised in that：If transparent reflecting layer (5) is made up of metallic mesh, metallic mesh is made up of the good alloy material of electric conductivity, and alloy thickness is more than 100nm.
7. the electromagnetic shielding optical window based on Graphene/transparent conductive film composite construction according to claim 1 it is characterised in that：The transparent medium making material of described transparent medium (4) and separation transparent absorbent layer (3) graphene film includes simple glass, quartz glass, infra-red material and transparent resin material.
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Cited By (6)
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| CN106659107A (en) * | 2017-03-01 | 2017-05-10 | 索曼电子（深圳）有限公司 | Nanoimprint shielding glass and manufacturing method therefor |
| CN108749244A (en) * | 2018-06-07 | 2018-11-06 | 苏州袭麟光电科技产业有限公司 | A kind of optics high flexibility electro-conductive glass film and preparation method thereof |
| CN112292014A (en) * | 2020-10-19 | 2021-01-29 | 哈尔滨工业大学 | Microwave transmission passband adjustable high-transmittance optical window based on phase-change material and graphene |
| CN112867379A (en) * | 2021-01-08 | 2021-05-28 | 中国科学院宁波材料技术与工程研究所 | Transparent ultra-wideband strong electromagnetic shielding device and preparation method thereof |
| CN113079683A (en) * | 2020-01-06 | 2021-07-06 | 宁波材料所杭州湾研究院 | High-light-transmission electromagnetic shielding film and preparation method thereof |
| CN114501969A (en) * | 2022-01-29 | 2022-05-13 | 哈尔滨工业大学 | High-transmittance thermally-adjustable microwave absorption optical window based on thermotropic phase change material |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112867379A (en) * | 2021-01-08 | 2021-05-28 | 中国科学院宁波材料技术与工程研究所 | Transparent ultra-wideband strong electromagnetic shielding device and preparation method thereof |
| CN114501969A (en) * | 2022-01-29 | 2022-05-13 | 哈尔滨工业大学 | High-transmittance thermally-adjustable microwave absorption optical window based on thermotropic phase change material |
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Application publication date: 20170215 |