CN109592964A - Electromagnetic shielding elastic controllable grapheme aeroge and preparation method thereof - Google Patents
Electromagnetic shielding elastic controllable grapheme aeroge and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of electromagnetic shielding preparation methods of elastic controllable grapheme aeroge, the following steps are included: first under agitation, silver nanowires aqueous dispersions are added in graphene oxide aqueous dispersions, 5~60min of stirring obtains graphene oxide/silver nanowires aqueous dispersions；Reducing agent is added into gained graphene oxide/silver nanowires aqueous dispersions, stirring to reducing agent is dissolved, and mixed liquor is obtained；Gained mixed liquor is obtained into hydrogel I in 50~100 DEG C of 30~90min of heating later；After gained hydrogel I is placed in -40~-10 DEG C of 0.5~8h of freezing, melt at room temperature, obtains hydrogel II；Gained hydrogel II is heated into 2~8h at 70~100 DEG C, obtains hydrogel III；It is dry under normal pressure after gained hydrogel III is washed, obtain graphene aerogel.The graphene aerogel unit intensity electromagnet shield effect prepared according to the method described above is high.
Description
Technical field
The present invention relates to technical field of new material preparation, and in particular to a kind of elastic controllable grapheme airsetting of electromagnetic shielding
Glue and preparation method thereof.
Background technique
With the continuous development of information age, widely available, the electromagnetic wave dirt of High performance electronics and radio technology
Dye problem very important in for people's lives.The 5G epoch gradually close on, even more along with high-frequency introducing, components
Upgrading and networked devices and antenna amount be doubled and redoubled, electromagnetic interference between equipment itself and equipment and equipment and
Radiate ubiquitous, this not only affects the service performance and service life of equipment itself and surrounding devices, also to the body of people
Body health causes certain harm.Therefore demand sustainable growth of the people to High Performance Shielding device.Electric conductivity is to influence
One key factor of electromagnetic shielding material, electromagnetic shielded product currently on the market are mainly metal base of good performance
Material, but the environmental stability of high density and difference seriously limits its further development.Therefore, in addition to good electromagnetic screen
Performance is covered, light, excellent chemical stability is equally an important factor for determining electromagnetic shielded product development.
The three-dimensional carbon material that carbon-based material, especially graphene, carbon nanotube are constructed with its ultralow density, excellent lead
Electrically with the characteristics such as chemical stability, corrosion-resistant, there is biggish application prospect resisting electromagnetic radiation and disturber face.Mesh
Before, from graphene oxide, it is the common method for preparing graphene aerogel, this method that chemistry or thermal reduction are carried out to it
Have the characteristics that it is simple, at low cost, but through chemistry or thermal reduction graphene conductive performance substantially reduce, be unfavorable for graphene and exist
The application in electromagnetic shielding field, therefore usually require that the electric conductivity that the second component improves material is added.Silver nanowires has higher
Conductivity, and its biggish draw ratio is convenient for being interwoven together to form access, but individually silver nanowires is exposed to ring
It is easy to happen corrosion in border, influences the performance of material.
Application No. is 201510455638.9 Chinese invention patents to be prepared for silver nanowires/graphene composite elastic airsetting
Glue, the aeroge show as the characteristics such as high resiliency, resistance is adjustable, but highly energy-consuming involved in the aeroge preparation process first is dry
Dry mode, meanwhile, the aperture of graphene aerogel being prepared using freeze-drying or supercritical drying is smaller, hole wall compared with
It is thin, it is insufficiently resistant to biggish external force deformation, and resilience is poor.Application No. is 201810101813.8 Chinese invention patents
It is prepared for a kind of electromagnetic shielding silicon rubber/nano combined three-dimensional porous material of graphene/silver nanowires, which leads with height
Electromagnetic shielding performance electrical and outstanding, but the material has also related to highly energy-consuming, time-consuming drying side during the preparation process
Formula, gained aeroge aperture smaller hole wall is relatively thin, and elasticity is poor.Above-mentioned preparation method process is relatively complicated, and time consumption and energy consumption, answers
It is relatively narrow with range, it is unfavorable for the large-scale application of material.Application No. is 201410692427.2 Chinese invention patents to be prepared for
Lightweight, graphene composite material flexible, the material have efficient electromagnet shield effect, and unit intensity electromagnet shield effect can
Up to 800dBcm3/g.But foam of polymers template selected by using similar approach must have macroporous structure, to different sizes
Graphene or the degree of absorption of presoma do not have universality, and gradient point is easy to produce during immersing graphene solution
Cloth causes to be unevenly distributed influence performance.In addition, the conductive network formed using similar method, skeleton does not have filler good
Good protective effect, directly affects the performance of material.Application No. is the Chinese invention patents of 201610566686.X to use normal pressure
Dry method is prepared for the amphiphilic graphene aerogel of intensity controlled, and the content realization pair for passing through control Cellulose nanocrystal
The regulation of aeroge intensity.So far, graphene oxide and silver nanowires dispersion liquid are directly utilized, it is dry by simple normal pressure
Graphene/silver nanowires aeroge research that dry method preparation structure is uniform, elasticity is controllable there is no report.
To sum up, it needs to improve the prior art.
Summary of the invention
The technical problem to be solved by the present invention is to propose it is a kind of low energy consumption, there is electro-magnetic screen function, and elasticity is controllable
Graphene aerogel and preparation method thereof；
In order to solve the above technical problems, the present invention proposes a kind of preparation of elastic controllable grapheme aeroge of electromagnetic shielding
Method, including the following steps successively carried out:
S1, graphene oxide/silver nanowires aqueous dispersions are prepared:
Silver nanowires aqueous dispersions are added to graphite oxide by (mixing speed is 800~1500rpm) under agitation
It (completes to be added in one minute) in alkene aqueous dispersions, 5~60min of stirring obtains graphene oxide/silver nanowires aqueous dispersions (should
Graphene oxide/silver nanowires aqueous dispersions disperse evenly and stably)；
It is added reducing agent into gained graphene oxide/silver nanowires aqueous dispersions, stirring (mixing speed is 800~
It 1500rpm) is dissolved to reducing agent, obtains mixed liquor；
S2, graphene aerogel is prepared:
2.1, gained mixed liquor is obtained into hydrogel I (suspending in water) in 50~100 DEG C of 30~90min of heating；
2.2, after gained hydrogel I being placed in -40~-10 DEG C of 0.5~8h of freezing, melt under room temperature (20~35 DEG C), obtain
Obtain hydrogel II；
2.3, gained hydrogel II is heated to 2~8h at 70~100 DEG C, obtains hydrogel III；
It 2.4, will be (i.e. one big in normal pressure after the washing of gained hydrogel III (removing unreacted reducing agent and other impurities)
Air pressure) under it is dry (dry to constant weight), obtain graphene aerogel.
Note: drying temperature can be selected according to the actual situation, can be at 10~100 DEG C when such as washing solvent for use is water
Under be dried.
The improvement of the preparation method with elastic controllable grapheme aeroge is electromagnetically shielded as the present invention:
The volume ratio of the silver nanowires aqueous dispersions and graphene oxide aqueous dispersions be 1:0.8~1.2 (optimal is 1:
1)。
The further improvement of the preparation method with elastic controllable grapheme aeroge is electromagnetically shielded as the present invention:
The concentration of the graphene oxide aqueous dispersions is 0.5~15mg/mL, graphene oxide used having a size of 0.5~
70μm；
The concentration of the silver nanowires aqueous dispersions is 0.1~15mg/mL, and silver nanowires diameter used is 5~200nm,
Length is 1~100 μm.
The further improvement of the preparation method with elastic controllable grapheme aeroge is electromagnetically shielded as the present invention:
The mass ratio of the reducing agent and graphene oxide is 1.5~2.5:1 (most preferably 2:1)；
The mixed liquor obtains hydrogel I (suspending in water) in 60 DEG C of heating 40min.
The further improvement of the preparation method with elastic controllable grapheme aeroge is electromagnetically shielded as the present invention:
After gained hydrogel I is placed in -20 DEG C of freezing 2h, melt under room temperature (20~35 DEG C), obtains hydrogel II.
The further improvement of the preparation method with elastic controllable grapheme aeroge is electromagnetically shielded as the present invention:
Gained hydrogel II is heated into 6h at 90 DEG C, obtains hydrogel III.
The further improvement of the preparation method with elastic controllable grapheme aeroge is electromagnetically shielded as the present invention:
The reducing agent is at least one of hydrazine hydrate, hydroiodic acid, ascorbic acid, glucose, tannic acid and tea polyphenols.
The further improvement of the preparation method with elastic controllable grapheme aeroge is electromagnetically shielded as the present invention:
In the step 2.4, water, methanol or ethanol washing hydrogel III are utilized.
In order to solve the above technical problems, the present invention also proposes a kind of electromagnetic shielding bullet prepared using the above method
Property controllable grapheme aeroge.
The improvement with elastic controllable grapheme aeroge is electromagnetically shielded as the present invention:
It is described electromagnetic shielding with elasticity controllable grapheme aeroge include following mass percent component:
Graphene 30%~99.5%
Silver nanowires 0.5%~70%
The electromagnetic shielding is 20~80dB with the electromagnet shield effect of elastic controllable grapheme aeroge.
For the prior art, technical advantage of the invention is:
(1), the present invention is prepared for the excellent graphene aerogel of electromagnetic shielding performance by the way of simple, low energy consumption,
Significantly reduce production cost；
(2), there is present invention gained graphene aerogel ultralow density (being lower than 20mg/cm3) to make made aeroge
Unit intensity electromagnet shield effect is high；
(3), due to combination good between silver nanowires and graphene, enable silver nanowires in graphene sheet layer
It protects down from being exposed to caused oxidation and corrosion in external environment, to improve the service life of material；
(4), the present invention can regulate and control the resilience of graphene aerogel by changing silver nanowires content, and have best
Value (figure of loss 0.43).
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 be 1 gained graphene aerogel of embodiment SEM figure (left figure is the microscopic appearance of gained graphene aerogel
Figure, right figure are the form schematic diagram of silver nanowires in gained graphene aerogel)；
Fig. 2 is that (left figure is that graphene aerogel is uncompressed for the compression process pictorial diagram of 1 gained graphene aerogel of embodiment
When state diagram, middle figure is state diagram when left figure graphene aerogel is compressed, and right figure is graphene aerogel shown in middle figure
Cancel compressed state diagram)；
Fig. 3 is electromagnet shield effect of the 4 gained graphene aerogel of embodiment in 8.2-12.4GHz.
Note: SEM, scanning electron microscope.
Specific embodiment
The present invention is described further combined with specific embodiments below, but protection scope of the present invention is not limited in
This.
The preparation method of embodiment 1, the elastic controllable grapheme aeroge of electromagnetic shielding, including the following step successively carried out
It is rapid:
1, raw material preparation:
Graphene oxide aqueous dispersions: concentration 10mg/mL, graphene oxide used is having a size of 5 μm；
Silver nanowires aqueous dispersions: concentration 1mg/mL, silver nanowires diameter used are 60nm, and length is 10 μm.
2, graphene oxide/silver nanowires aqueous dispersions are prepared:
Silver nanowires aqueous dispersions are slowly added into graphene oxide by (mixing speed 800rpm) under agitation
It (completes to be added in one minute) in aqueous dispersions, continues to stir graphene oxide/silver of the 10min to be dispersed evenly and stably
Then the ascorbic acid as reducing agent, stirring (mixing speed 800rpm) to ascorbic acid is added in nano wire aqueous dispersions
Dissolution obtains mixed liquor；
The volume ratio of graphene oxide aqueous dispersions and silver nanowires aqueous dispersions is 1:1；
The mass ratio of ascorbic acid and graphene oxide is 2:1.
Note: reducing agent is at least one of hydrazine hydrate, hydroiodic acid, ascorbic acid, glucose, tannic acid and tea polyphenols
3, graphene aerogel is prepared:
3.1, gained mixed liquor is placed in 60 DEG C of baking ovens and heats 40min, obtain hydrogel I (suspending in water)；
3.2, after gained hydrogel I being placed in -20 DEG C of freezing 2h, melt under room temperature (25 DEG C), obtain hydrogel II.
3.3, gained hydrogel II is heated at 90 DEG C 6h, obtains hydrogel III.
3.4, gained hydrogel III is washed using water, removes unreacted ascorbic acid and other impurities, then
Normal pressure (i.e. an atmospheric pressure) lower 60 DEG C of dryings obtain graphene aerogel.
Note: also using methanol or ethanol washing hydrogel III.
Graphene contains 90.1% in gained graphene aerogel, and silver nanowires contains 9.9%；
Note: above-mentioned % is quality %.
The electron microscope of gained graphene aerogel is as shown in Figure 1, the graphene aerogel structure feature is: having by graphite
Alkene lamella mutually overlaps the porous structure of formation, and silver nanowires is attached to the graphene film interlayer for constituting hole wall or on its surface,
Three-D space structure unit is consequently formed.
The density of gained graphene aerogel is 7.31mg/cm3, electromagnet shield effect 21dB, unit intensity electromagnetic screen
Covering efficiency is 2873 dBcm3·g-1, can obtain figure of loss by compression curve after compression is 0.52.
Note: above-mentioned electromagnet shield effect is obtained by the measurement of existing vector network analyzer, unit intensity electromagnetic shielding effect
Gained can be calculated divided by density by its electromagnet shield effect, figure of loss is obtained according to compression reaction curve.
Above-mentioned is the prior art, therefore is not described in detail to its specific mensuration mode.
The state that gained graphene aerogel is compressed under normal pressure (i.e. an atmospheric pressure) is as shown in Fig. 2, right figure is
Status diagram of the gained graphene aerogel under normal pressure (i.e. an atmospheric pressure), middle figure be the graphene under external force
The status diagram compressed, left figure are that the graphene cancels the status diagram after external force.
To prove that the graphene aerogel prepared according to the method described above has preferable resilience, it can be achieved that repeatedly
Compression rebound.
Note: figure of loss is smaller, and resilience is preferable.
Embodiment 2, the concentration of silver nanowires aqueous dispersions in 1 step 1 of embodiment is served as reasons " 1mg/mL " be changed to " 3mg/
ML ", remaining is equal to embodiment 1.
Graphene contains 76.2% in gained graphene aerogel, and silver nanowires contains 23.8%；
Note: above-mentioned % is quality %.
The density of gained graphene aerogel is 7.46mg/cm3, electromagnet shield effect 25.4dB, unit intensity electromagnetism
Shield effectiveness is 3405 dBcm3·g-1, can obtain figure of loss by compression curve after compression is 0.49.
Embodiment 3, the concentration of silver nanowires aqueous dispersions in 1 step 1 of embodiment is served as reasons " 1mg/mL " be changed to " 8mg/
ML ", remaining is equal to embodiment 1.
Graphene contains 53.6% in gained graphene aerogel, and silver nanowires contains 46.4%；
Note: above-mentioned % is quality %.
The density of gained graphene aerogel is 12.79mg/cm3, electromagnet shield effect 35.8dB, unit intensity electromagnetism
Shield effectiveness is 2799 dBcm3·g-1, can obtain figure of loss by compression curve after compression is 0.75.
Embodiment 4, the concentration of silver nanowires aqueous dispersions in 1 step 1 of embodiment is served as reasons " 1mg/mL " be changed to
" 15mg/mL ", remaining is equal to embodiment 1.
Graphene contains 38.6% in gained graphene aerogel, and silver nanowires contains 61.4%；
Note: above-mentioned % is quality %.
The density of gained graphene aerogel is 19.2mg/cm3, electromagnet shield effect 45.2dB, unit intensity electromagnetism
Shield effectiveness is 2354 dBcm3·g-1, can obtain figure of loss by compression curve after compression is 0.92.
From the foregoing, it will be observed that when the concentration of silver nanowires dispersion liquid is 3mg/mL, that is, the weight of silver nanowires and graphene oxide
When than for 3:10, gained graphene aerogel figure of loss is minimum；
When silver nanowires and the weight ratio of graphene oxide are more than 3:10, with the increase of silver nanowires dosage, energy damage
Coefficient is consumed to increase.
When silver nanowires and the weight ratio of graphene oxide are lower than 3:10, with the reduction of silver nanowires dosage, energy damage
Coefficient is consumed to increase.
To pass through the change to silver nanowires content, the resilience of control gained graphene aerogel.
The temperature of gained mixed liquor heating in 2 step 3.1 of embodiment is changed to " 75 DEG C " by " 60 DEG C " by embodiment 5,
It is remaining to be equal to embodiment 2.
Graphene contains 75.9% in gained graphene aerogel, and silver nanowires contains 24.1%；
Note: above-mentioned % is quality %.
The density of gained graphene aerogel is 7.37mg/cm3, electromagnet shield effect 26.1dB, unit intensity electromagnetism
Shield effectiveness is 3541dBcm3·g-1, can obtain figure of loss by compression curve after compression is 0.47.
Reducing agent used by 2 step 2 of embodiment is changed to " complex reducing agent " by " ascorbic acid " by embodiment 6,
The mass ratio of middle complex reducing agent and graphene oxide is 2:1, and complex reducing agent is made of ascorbic acid and tea polyphenols, Vitamin C
Acid: the mass ratio of tea polyphenols is 1:1, remaining is equal to embodiment 2.
Graphene contains 74.1% in gained graphene aerogel, and silver nanowires contains 25.9%；
Note: above-mentioned % is quality %.
The density of gained graphene aerogel is 7.29mg/cm3, electromagnet shield effect 26.4dB, unit intensity electromagnetism
Shield effectiveness is 3621dBcm3·g-1, can obtain figure of loss by compression curve after compression is 0.43.
2~embodiment of above-described embodiment 6 gained graphene aerogel all has mutually to be overlapped by graphene sheet layer and be formed
Porous structure, and silver nanowires is attached to the graphene film interlayer for constituting hole wall or on its surface, three-dimensional space knot is consequently formed
Structure unit.
Comprehensively consider gained graphene aerogel electromagnet shield effect and resilience, the stone that above-described embodiment 6 prepares
The electromagnet shield effect of black alkene aeroge reaches requirement of the invention, and its unit intensity electromagnet shield effect and energy loss system
Number is best, therefore with embodiment 6 for best case.
Comparative example 1 cancels 6 step 3.2 of embodiment, i.e., gained hydrogel I is heated 6h at 90 DEG C, obtains hydrogel
III,
Remaining is equal to embodiment 6.
Graphene contains 75.3% in gained graphene aerogel, and silver nanowires contains 24.7%；
Note: above-mentioned % is quality %.
Gained graphene aerogel volume is compared with hydrogel significant shrinkage, density 13.4mg/cm3, electromagnet shield effect is
26.1dB, unit intensity electromagnet shield effect are 1948dBcm3·g-1, energy loss system can be obtained by compression curve after compression
Number is 0.76.
Comparative example 2, the constant pressure and dry process change for using 6 step 3.4 of embodiment is freeze-dryings, that is, after washing
Hydrogel III be put into -75 DEG C of refrigerators and freeze 4h, product is then put into freeze drier dry 12h, remaining is equal to
Embodiment 6.
Graphene contains 76.1% in gained graphene aerogel, and silver nanowires contains 23.9%；
Note: above-mentioned % is quality %.
The density of gained graphene aerogel is 7.45mg/cm3, electromagnet shield effect 25.3dB, unit intensity electromagnetism
Shield effectiveness is 3396dBcm3·g-1, can obtain figure of loss by compression curve is 0.56, and the method energy consumption is high, does
The dry time is long.
Comparative example 3, the constant pressure and dry process change for using 6 step 3.4 of embodiment are dry for supercritical carbon dioxide,
That is, the hydrogel III after washing is carried out repeatedly solvent displacement with ethyl alcohol, then overcritical to make it dry to constant weight, remaining is equivalent
In embodiment 6.
Graphene contains 76.1% in gained graphene aerogel, and silver nanowires contains 23.9%；
Note: above-mentioned % is quality %.
The density of gained graphene aerogel is 7.43mg/cm3, electromagnet shield effect 25.3dB, unit intensity electromagnetism
Shield effectiveness is 3405dBcm3·g-1, can obtain figure of loss by compression curve after compression is 0.57, and the method
Energy consumption is high, and drying time is long.
It is that low energy consumption compared to freeze-drying and supercritical drying, the advantage of constant pressure and dry, it is time-consuming short.
The silver nanowires that 6 step 1 of embodiment uses is changed to Cellulose nanocrystal by comparative example 4, remaining is equal to implementation
Example 6.
Graphene contains 75.2% in gained graphene aerogel, and Cellulose nanocrystal contains 24.8%；
Note: above-mentioned % is quality %.
The density of gained graphene aerogel is 7.9mg/cm3, electromagnet shield effect 18dB, unit intensity electromagnetic shielding
Efficiency is 2278dBcm3·g-1, can obtain figure of loss by compression curve after compression is 0.56.
Comparative example 5, the silver nanowires for using 6 step 1 of embodiment change carbon nanotube, remaining is equal to embodiment 6.
Graphene contains 76.4% in gained graphene aerogel, and carbon nanotube contains 23.6%；
Note: above-mentioned % is quality %.
The density of gained graphene aerogel is 7.67mg/cm3, electromagnet shield effect 25.9dB, unit intensity electromagnetism
Shield effectiveness is 3377dBcm3·g-1, can obtain figure of loss by compression curve after compression is 0.50.
To sum up, the present invention solve graphene and its composite aerogel during the preparation process high energy consumption and be difficult to it is evenly dispersed
The problem of, production cost is significantly reduced, is expected to realize the large-scale production of electromagnetic shielding graphene aerogel, and return
The application field of electromagnetic shielding graphene aerogel has further been widened in the regulation of elasticity.
The above list is only a few specific embodiments of the present invention for finally, it should also be noted that.Obviously, this hair
Bright to be not limited to above embodiments, acceptable there are many deformations.Those skilled in the art can be from present disclosure
All deformations for directly exporting or associating, are considered as protection scope of the present invention.
Claims (10)
1. the electromagnetic shielding preparation method of elastic controllable grapheme aeroge, it is characterized in that including the following step successively carried out
It is rapid:
S1, graphene oxide/silver nanowires aqueous dispersions are prepared:
Under agitation, silver nanowires aqueous dispersions are added in graphene oxide aqueous dispersions, 5~60min of stirring is obtained
Obtain graphene oxide/silver nanowires aqueous dispersions；
Reducing agent is added into gained graphene oxide/silver nanowires aqueous dispersions, stirring to reducing agent is dissolved, mixed
Liquid；
S2, graphene aerogel is prepared:
2.1, gained mixed liquor is obtained into hydrogel I in 50~100 DEG C of 30~90min of heating；
2.2, after gained hydrogel I being placed in -40~-10 DEG C of 0.5~8h of freezing, melt at room temperature, obtain hydrogel II；
2.3, gained hydrogel II is heated to 2~8h at 70~100 DEG C, obtains hydrogel III；
2.4, dry under normal pressure after washing gained hydrogel III, obtain graphene aerogel.
2. the electromagnetic shielding according to claim 1 preparation method of elastic controllable grapheme aeroge, it is characterised in that:
The volume ratio of the silver nanowires aqueous dispersions and graphene oxide aqueous dispersions is 1:0.8~1.2.
3. the electromagnetic shielding according to claim 2 preparation method of elastic controllable grapheme aeroge, it is characterised in that:
The concentration of the graphene oxide aqueous dispersions is 0.5~15mg/mL, and graphene oxide used is having a size of 0.5~70 μm；
The concentration of the silver nanowires aqueous dispersions is 0.1~15mg/mL, and silver nanowires diameter used is 5~200nm, length
It is 1~100 μm.
4. the electromagnetic shielding according to claims 1 to 3 preparation method of elastic controllable grapheme aeroge, feature exist
In:
The mass ratio of the reducing agent and graphene oxide is 1.5~2.5:1；
The mixed liquor obtains hydrogel I in 60 DEG C of heating 40min.
5. the electromagnetic shielding according to claim 4 preparation method of elastic controllable grapheme aeroge, it is characterised in that:
After gained hydrogel I is placed in -20 DEG C of freezing 2h, melt at room temperature, obtains hydrogel II.
6. the electromagnetic shielding according to claim 5 preparation method of elastic controllable grapheme aeroge, it is characterised in that:
Gained hydrogel II is heated into 6h at 90 DEG C, obtains hydrogel III.
7. the electromagnetic shielding according to claim 6 preparation method of elastic controllable grapheme aeroge, it is characterised in that:
The reducing agent is at least one of hydrazine hydrate, hydroiodic acid, ascorbic acid, glucose, tannic acid and tea polyphenols.
8. the electromagnetic shielding according to claim 7 preparation method of elastic controllable grapheme aeroge, it is characterised in that:
In the step 2.4, water, methanol or ethanol washing hydrogel III are utilized.
9. the elastic controllable grapheme aeroge of electromagnetic shielding prepared using any method of claim 1~8.
10. the elastic controllable grapheme aeroge of electromagnetic shielding according to claim 9, it is characterised in that:
It is described electromagnetic shielding with elasticity controllable grapheme aeroge include following mass percent component:
Graphene 30%~99.5%
Silver nanowires 0.5%~70%
The electromagnetic shielding is 20~80dB with the electromagnet shield effect of elastic controllable grapheme aeroge.
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| CN113318257A (en) * | 2021-05-28 | 2021-08-31 | 厦门大学 | Preparation method of silver nanowire loaded graphene aerogel for air purification and sterilization |
| CN113501976A (en) * | 2021-08-11 | 2021-10-15 | 电子科技大学 | Preparation method of electromagnetic shielding self-repairing skin-friendly hydrogel |
| CN113993366A (en) * | 2021-11-02 | 2022-01-28 | 西安电子科技大学 | Magnetic control reconfigurable silver nanowire electromagnetic shielding film and preparation method thereof |
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| CN114656274A (en) * | 2022-03-08 | 2022-06-24 | 西北工业大学 | Nanowire array modified graphene honeycomb reinforced nano aerogel heat-insulation wave-absorbing composite material |
| CN114656274B (en) * | 2022-03-08 | 2023-05-05 | 西北工业大学 | Nanowire array modified graphene honeycomb reinforced nano aerogel heat insulation wave-absorbing composite material |
| CN115212814A (en) * | 2022-07-14 | 2022-10-21 | 北京旭碳新材料科技有限公司 | Graphene composite aerogel composition, graphene composite aerogel, and preparation method and application thereof |
| CN115212814B (en) * | 2022-07-14 | 2023-11-03 | 北京旭碳新材料科技有限公司 | Graphene composite aerogel composition, graphene composite aerogel, and preparation method and application thereof |
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