CN113063240B - Composite structure surface in field of radiation-enhanced refrigeration - Google Patents
Composite structure surface in field of radiation-enhanced refrigeration Download PDFInfo
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- CN113063240B CN113063240B CN202110295321.9A CN202110295321A CN113063240B CN 113063240 B CN113063240 B CN 113063240B CN 202110295321 A CN202110295321 A CN 202110295321A CN 113063240 B CN113063240 B CN 113063240B
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- germanium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
- F25B23/003—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect using selective radiation effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
- B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
- B32B3/085—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts spaced apart pieces on the surface of a layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/06—Coating on the layer surface on metal layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/20—Inorganic coating
- B32B2255/205—Metallic coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
Abstract
The invention belongs to the technical field of radiation refrigeration, and provides a composite structure surface in the field of enhanced radiation refrigeration. The surface is based on a material stacking sequence of titanium-germanium-tungsten, wherein for titanium metal it is necessary to dimension and prepare metal strips with length, width and thickness of 1 μm, 0.2 μm and 0.06 μm in sequence, which are respectively placed on a tungsten substrate and dielectric germanium, the metal strips are distributed in a staggered manner in parallel and perpendicular directions, and the distance between adjacent and parallel strips is set to 1 μm. The middle germanium dielectric layer was set to 0.6 μm while the metal tungsten was set to a metal substrate with a thickness of 2 μm. The surface of the invention has the characteristics of strong preparation feasibility and outstanding radiation characteristic, and the surface can have higher spectral emissivity in an atmospheric window wave band, thereby meeting the requirement of radiation refrigeration.
Description
Technical Field
The invention belongs to the technical field of radiation refrigeration, and relates to a composite structure surface in the field of enhanced radiation refrigeration.
Background
The atmosphere has extremely high transmission performance to electromagnetic waves in a special wave band, such as an 8-13 μm interval, so that the electromagnetic waves can be directly radiated to the space, and the wave band is called an atmosphere window. According to the thermodynamic application value of an atmospheric window, radiation refrigeration is proposed as a passive heat dissipation mode, and the purpose is to intensify radiation of electromagnetic waves with the wavelength in the spectral region of 8-13 mu m and inhibit emission of the electromagnetic waves outside the range. The metamaterial electromagnetic emitter can enable the surface to have the characteristic of high emissivity at an atmospheric window wave band in a microcosmic regulation mode, so that the requirement of radiation refrigeration is met.
With the progress of nanotechnology, micro-nano models applied to radiation refrigeration are widely researched and proposed. Such as the documents Wang H, Prasad Sivan V, Mitchell A, Rosengarten G, Phelan P, Wang L.high y effect selective metallic adsorbent for high-temperature Solar Energy harnessing.solar Energy Materials and Solar cells.2015; 137:235-42, proposes Ti-MgF2A trapezoidal micro-surface of W structure, with high absorption in the visible and atmospheric region by varying the geometrical parameters of Ti metalThe characteristic of high emissivity in the window interval is that the window interval can be applied to the surface of a solar cell, and the functions of radiation refrigeration and photovoltaic power generation can be simultaneously met. Similarly, the documents Liu Q, Wu W, Lin S, Xu H, Lu Y, Song W.non-qualified metadata instruments for radial mutual to low temperature communications.2019; 450:246-51. the average emissivity of the grating structure in the atmospheric window waveband reaches 0.8 and the temperature is reduced by 55K by stacking a plurality of layers of metal-medium-metal cylindrical periodic grating structures in the vertical direction. The structures have great flexibility and innovation in design, but the overall structure is complex, the requirement on preparation precision is high, and the structures are difficult to popularize and apply in a large range. In addition, the models proposed by the scholars still have the problems of low spectral emissivity, narrow emission bandwidth, poor spectral selectivity and the like in theory, and are not beneficial to wide application in the field of radiation refrigeration by combining with complex model design. Therefore, it is important to develop a surface with simple structure design, low manufacturing difficulty, and capable of well satisfying the continuous high emission characteristic in the atmospheric window interval (8-13 μm).
Disclosure of Invention
The invention aims to solve the problems of complex surface design, poor spectral radiation characteristic and the like of a radiation structure, and provides a titanium-germanium-tungsten based composite structure surface.
The technical scheme of the invention is as follows:
a composite structure surface in the field of radiation-enhanced refrigeration comprises a metal tungsten substrate, a semiconductor germanium dielectric layer and a titanium metal strip, wherein the semiconductor germanium dielectric layer is positioned on the metal tungsten substrate, and the titanium metal strip is positioned on the semiconductor germanium dielectric layer;
the thickness L8 of the metal tungsten substrate is 2-2.5 μm; the semiconductor germanium dielectric layer L7 is 0.6-0.8 μm; the length L3 of the titanium metal strip is 1-1.2 μm, the width L4 is 0.2-0.25 μm, and the height L9 is 0.06-0.08 μm; the titanium metal strips are vertically and parallelly distributed on the semiconductor germanium dielectric layer in a staggered manner; the distance L2 between the two parallel titanium metal strips in the parallel direction is 1 μm, and the distance L3+2L1 between the two vertical titanium metal strips in the parallel direction is 1.8-2 μm; the distance L6 between the two vertical titanium metal strips in the vertical direction is 1 μm, and the distance L3+2L5 between the two parallel titanium metal strips in the vertical direction is 1.8-2 μm.
The invention has the beneficial effects that: the method is characterized in that metal tungsten is used as a substrate, thin semiconductor germanium is coated on the substrate to be used as a dielectric layer, and titanium metal strips which are distributed vertically and parallelly in a staggered mode are stacked on the dielectric layer. Under the condition of short-wave incidence of lambda 9.4 mu m, the top layer titanium metal strip can generate induced current on the surface, and simultaneously, the induced current is formed in the metal tungsten substrate, so that closed loop current is formed in the germanium dielectric layer. The phenomenon can excite the magnetic resonance in the germanium semiconductor layer, so that the magnetic resonance has a strong constraint effect on short waves, and the absorption of the metal tungsten on the short waves is enhanced. And under the condition of long-wave incidence with the lambda being 12.1 mu m, a magnetic field is formed at the boundary of the top-layer titanium metal strip and the germanium dielectric layer for strengthening, induction current is formed, and the magnetic field is strongly bound on the interface, so that the absorption of the top-layer titanium metal strip for the long wave is strengthened. It can be seen that the surface of the titanium-germanium-tungsten composite structure has a high absorption ratio at both short wavelengths λ 9.4 μm and long wavelengths λ 12.1 μm, thereby enhancing the radiation in the spectral region of 8-13 μm and suppressing the emission of electromagnetic waves outside this range.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the structural model is simple in design and has certain preparation feasibility.
2. The titanium-germanium-tungsten micro-nano composite structure surface calculated by the method has the spectral emissivity exceeding 0.9 in the atmospheric window band (8-13 mu m), has a wide spectral bandwidth without obvious defects, and has low emissivity not exceeding 0.2 in other middle infrared bands.
3. By adopting the titanium-germanium-tungsten composite structure, a perfect electromagnetic emitter is formed, and the effects of surface plasmon, electric dipole resonance, magnetic polarization resonance and the like are excited.
Drawings
FIG. 1 is a 3D diagram of a radiation refrigerating surface of a metamaterial composite structure provided by the invention.
FIG. 2 is a parallel-axis structural feature of a surface of a composite structure.
FIG. 3 is a structural feature of a vertical axis of a surface of a composite structure.
Detailed Description
The invention is based on a temperature range of 50-100 ℃. Considering the characteristic that the heat radiation is mainly concentrated in the near-mid infrared region, a titanium-germanium-tungsten based composite structure surface is proposed.
The thickness L8 of the metal tungsten substrate is 2-2.5 μm, and the thickness L7 of the semiconductor germanium dielectric layer is 0.6-0.8 μm; the length L3 of the titanium metal strip is 1-1.2 μm, the width L4 is 0.2-0.25 μm, and the height L9 is 0.06-0.08 μm; the vertical and parallel titanium metal strips are distributed in a staggered way; the distance L2 of the parallel titanium metal strips in the parallel direction is 1 mu m, and the distance L3+2L1 of the vertical titanium metal strips in the parallel direction is 1.8-2 mu m; the distance L6 of the vertical titanium metal strip in the vertical direction is 1 μm, and the distance L3+2L5 of the parallel titanium metal strip in the vertical direction is 1.8-2 μm.
The titanium-germanium-tungsten micro-nano composite structure can strengthen the absorption of the radiation structure at different places under the condition of different incident wavelengths. When short waves are incident, the induced current formed in the metal tungsten substrate and the germanium dielectric layer form closed loop current, and then magnetic resonance is triggered on the germanium dielectric layer, so that the strong binding effect of the germanium-tungsten interface on the short waves is strengthened, and the short waves are quickly absorbed in the metal tungsten substrate. When long wave is incident, the interface of the titanium metal strips and the germanium dielectric layer is distributed on the top layer in a staggered mode to form induction current, and then the magnetic resonance effect is triggered. The magnetic resonance effect is that electromagnetic waves of the ginger are strongly bound into the titanium metal strip and finally converted into heat energy to be consumed, so that the absorption of long waves is enhanced.
The specific working process of the invention is as follows:
at short wavelength, electromagnetic wave will generate coupling effect with 2 μm tungsten substrate, exciting surface plasmon, and generating induced current. And a closed loop current is formed inside the 0.6 μm germanium dielectric layer, thereby causing a magnetic resonance effect. The magnetic resonance is opposite to the direction of the magnetic field component of the incident electromagnetic wave, and has a strong binding effect, so that the absorption of the unit structure by 2 mu m under the condition of short-wave incidence plays a leading role, and the emission capability of the composite surface to the short wave is enhanced according to kirchhoff's law.
At a long wavelength, a top layer titanium metal strip 1 Mum multiplied by 0.2 Mum band generates directional gathering of charges at two ends of a long axis under the influence of electromagnetic waves, so that electric dipole resonance is generated, induced current is excited by the resonance mode, a plurality of closed loops are formed with a 0.6 Mum germanium medium layer, a magnetic resonance effect is caused, the effect can strongly restrict the electromagnetic waves into a structure, the electromagnetic waves are finally converted into heat energy to be consumed, the dominant effect of the top layer titanium metal strip 1 Mum multiplied by 0.2 Mum band on long-wave absorption is shown, and the emission capability is enhanced. In addition, the arrangement mode of the 1-micron-multiplied-0.2-micron strip of the rectangular symmetrical titanium metal strip can show insensitivity to a polarization angle and a polar angle, has a good compensation effect on the defect of an emissivity spectrum, and is the key for realizing selective radiation of the metamaterial surface in an atmospheric window interval.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modifications to the above embodiment are possible in accordance with the technical spirit of the present invention. Modifications and equivalent structural changes are also within the scope of the technical solution of the present invention.
Claims (1)
1. The surface of the composite structure in the field of radiation-enhanced refrigeration is characterized by comprising a metal tungsten substrate, a semiconductor germanium dielectric layer and a titanium metal strip, wherein the semiconductor germanium dielectric layer is positioned on the metal tungsten substrate, and the titanium metal strip is positioned on the semiconductor germanium dielectric layer to form a titanium-germanium-tungsten micro-nano composite structure;
the thickness L8 of the metal tungsten substrate is 2-2.5 μm; the semiconductor germanium dielectric layer L7 is 0.6-0.8 μm; the length L3 of the titanium metal strip is 1-1.2 μm, the width L4 is 0.2-0.25 μm, and the height L9 is 0.06-0.08 μm; the titanium metal strips are vertically and parallelly distributed on the semiconductor germanium dielectric layer in a staggered manner; the distance L2 between the two parallel titanium metal strips in the parallel direction is 1 μm, and the distance L3+2L1 between the two vertical titanium metal strips in the parallel direction is 1.8-2 μm; the distance L6 between the two vertical titanium metal strips in the vertical direction is 1 μm, and the distance L3+2L5 between the two parallel titanium metal strips in the vertical direction is 1.8-2 μm;
the titanium-germanium-tungsten micro-nano composite structure can strengthen the absorption of the radiation structure at different places under the condition of different incident wavelengths.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160356561A1 (en) * | 2015-06-03 | 2016-12-08 | PC Krause and Associates | Composite material for passive radiative cooling |
| US20170219746A1 (en) * | 2014-08-29 | 2017-08-03 | National Institute For Materials Science | Electromagnetic Wave Absorbing/Radiating Material, Method of Manufacturing Same, and Infrared Source |
| CN112460837A (en) * | 2020-12-05 | 2021-03-09 | 中国人民解放军国防科技大学 | Titanium dioxide selective wave absorber based on DBS algorithm and design method |
| CN112460836A (en) * | 2020-11-17 | 2021-03-09 | 淮阴工学院 | Passive radiation cooling composite material film |
| CN112513690A (en) * | 2018-07-31 | 2021-03-16 | 住友电气工业株式会社 | Radiation device and emission cooling device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170219746A1 (en) * | 2014-08-29 | 2017-08-03 | National Institute For Materials Science | Electromagnetic Wave Absorbing/Radiating Material, Method of Manufacturing Same, and Infrared Source |
| US20160356561A1 (en) * | 2015-06-03 | 2016-12-08 | PC Krause and Associates | Composite material for passive radiative cooling |
| CN112513690A (en) * | 2018-07-31 | 2021-03-16 | 住友电气工业株式会社 | Radiation device and emission cooling device |
| CN112460836A (en) * | 2020-11-17 | 2021-03-09 | 淮阴工学院 | Passive radiation cooling composite material film |
| CN112460837A (en) * | 2020-12-05 | 2021-03-09 | 中国人民解放军国防科技大学 | Titanium dioxide selective wave absorber based on DBS algorithm and design method |
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