CN105752978B - A kind of modified graphene and preparation method - Google Patents
A kind of modified graphene and preparation method Download PDFInfo
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- CN105752978B CN105752978B CN201610298441.3A CN201610298441A CN105752978B CN 105752978 B CN105752978 B CN 105752978B CN 201610298441 A CN201610298441 A CN 201610298441A CN 105752978 B CN105752978 B CN 105752978B
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Abstract
The invention discloses a kind of modified graphene products, it is obtained by rutin modified graphene.The invention also discloses a kind of surface modification method of graphene, which is that plasma-treated graphene is added in rutin aqueous solution, is uniformly dispersed, and is stood, and filtering takes filter residue to be dried in vacuo, obtains the graphene of surface modification.Modified graphene good dispersion of the invention, impurity content are low.The method of the present invention will not cause chemical damage to graphene simultaneously, maintain the integrality of graphene, and do not generate the pollutants such as waste water, spent acid, simple process, technological parameter is easy to control, and is had broad application prospects.
Description
Technical field
The invention belongs to field of nanometer technology more particularly to a kind of surface modification methods of graphene.
Background technique
Ideal graphene (CNFs) structure is plane hexagonal lattice, can be seen as under removing from three-dimensional graphite
The one layer of molecular layer come, each carbon atom is sp2Hydridization is contributed on the direction vertical with plane on a remaining p track
Electronically form big pi bond, pi-electron can move freely, assign the good electric conductivity of graphene；In graphene, each carbon is former
Son is connected by very strong σ key (strongest chemical bond in nature) with other 3 carbon atoms, these very strong carbon-carbon bonds
So that graphene sheet layer has extremely excellent mechanical property and structural rigidity, Young's modulus is about 1TPa, and intensity is about 130
~180GPa.Since graphene has above-mentioned excellent properties, so that it can be used for the super of the fields such as automobile, machinery, electronics, military affairs
Grade capacitor manufacture, and can with the conductive material of the compound composition excellent combination property of various metals, nonmetallic and high molecular material,
High strength composite, shielding material and stealth material etc..
But due to the nano-grade size of graphene, big specific surface area, while stronger Van der Waals between graphene molecules
Thus power effect causes graphene to be difficult to be distributed in various solvents, seriously so that graphene is easy to occur in the form of reunion shape
The practical application of graphene is affected, how effectively dispersed graphite alkene has great importance.
Graphene surface modification is to improve the important method of its dispersibility.It generallys use and strong acid pretreatment is carried out to graphene
Afterwards, make its surface with functional groups such as carboxyls, the scion graftings such as amidation, esterification reaction is then carried out again, to improve graphene
Dispersibility.But use strong acid or nitration mixture processing to be damaged to a certain extent effect to graphene, and often need higher temperature with
Long period, while while handling, is easy to produce the gas of pollution.
Plasma modification carbon nanotube and the mechanism of graphene mainly pass through plasma bombardment carbon nanotube and stone
Black alkene directly grafts functional group on its surface, or generates active site on the surface of carbon nanotube and graphene by bombardment,
Then by being handled indirectly in its surface graft-OH ,-COOH functional group.Felten etc. uses O2Corona treatment carbon nanometer
Pipe, mutually its content of surface oxygen obviously increases method after processing.Wu etc. uses NH3Plasma treatment carbon nanotube finds it after processing
Amido functional group on surface graft.Wei Qinqin uses O2Corona treatment graphene, introduces on the surface of graphene after processing
A large amount of defect, to improve possibility to be further grapheme modified.
Summary of the invention
Graphene is easy to reunite in the prior art and difficulties in dispersion it is an object of the invention to overcoming, and existing method of modifying
The deficiency of existing damage graphene molecules, provides a kind of graphene product of modifying and decorating, and prepare the table of the graphene
Surface modification method.Modified graphene good product dispersibility of the invention, acrobatics content is few, best in quality.Modification side of the invention
The processing of method using plasma combines rutin aqueous solution soaking to be surface modified graphene, obtained modified graphene dispersion
Property is good, and impurity content is low.The method of the present invention will not cause chemical damage to graphene simultaneously, maintain the integrality of graphene,
And the pollutants such as waste water, spent acid are not generated, simple process, technological parameter is easy to control.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes：
A kind of modified graphene product, it is obtained by rutin modified graphene.It is there is no at present about the modified stone of rutin
The research of black alkene, the innovative proposition of the present invention are modified graphene with rutin, and rutin is integrated to plane in modifying process
The graphene surface of structure enables the surface of graphene to combine upper certain activity, hydrophilic functional group, so that graphene has
Preferably dispersibility.Meanwhile the planar pi bond of graphene surface is changed in conjunction with upper rutin so that lamellar graphite alkene molecule it
Between absorption combination reduce, no longer generation multi-layer graphene molecule van der Waals interaction the problem of being closely attached onto.
Further, the method for rutin modified graphene is adsorption.Rutin molecule is by adsorption in graphene point
The surface of son, binding force is good, and the active function groups of modified reservation are more, has excellent physicochemical property.
Further, graphene is the graphene after corona treatment.Graphene passes through corona treatment, then
It is modified that adsorption is carried out with rutin.Graphene molecules surface can be very low, and the efficiency generally bound directly is lower, reaction time
Long, using plasma is activated so that graphene and rutin are more efficient when combination.
Further, rutin is adsorbed onto the combination and benzene ring structure that the surface of graphene includes active function groups between the two
On π-π non-covalent bond effect.The mode that rutin and graphene combine can be it is diversified, mainly by above-mentioned combination
It is combined, good in conjunction with the firmness between rear rutin and graphene, the potentiality of secondary chemical reaction are big, have higher application
Value.The graphene is single-layer graphene or multi-layer graphene, further includes few layer graphene.
Meanwhile the present invention also provides a kind of methods for preparing the modified graphene, the i.e. method of graphene surface modification.
A kind of surface modification method of graphene, includes the following steps：
(1) graphene is taken to be handled with plasma its surface.
(2) graphene Jing Guo corona treatment is added in rutin aqueous solution, is uniformly dispersed, stood.
(3) solution is filtered, filter residue is taken to be dried in vacuo, obtain the graphene of surface modification.
During the present invention prepares modified graphene, first with corona treatment graphene, pass through plasma pair
Graphene is bombarded, and on the surface of graphene can directly graft the functional groups such as hydroxyl, carboxyl and amino and in graphene
Surface generate some active sites or defect, further modification can be carried out and combined with rutin.Work as graphene
After being added in rutin solution, one side rutin in conjunction with graphene surface defect sites, is connect by itself phenolic hydroxyl group
Branch functional group is to be surface modified graphene；On the other hand, rutin is occurred using its big pi-conjugated structure and graphene
Pi-pi accumulation effect, to modify graphene, improves the dispersibility of graphene.It should be understood that rutin solution and not only
It is limited to aqueous solution, using aqueous solution for no other reason than that rutin aqueous solution easily obtains, aqueous solution and graphene interaction, side reaction are small
The advantages of.
The chemical formula of rutin is C27H30O16, structure is as shown in following formula 1, relative molecular weight 610.15, and character is Huang
Color crystal powder is last without crystalline flour, and bitter is slightly soluble in water, can be dissolved in hot water and ethyl alcohol.It can go bad under light illumination, need it
It is placed under shady and cool environment and saves.1g rutin is dissolved in 7mL methanol, 8000mL water, 200mL boiling water, 23mL boiling ethyl alcohol, 290mL
In cold ethyl alcohol.From formula 1 as can be seen that rutin contains phenyl ring, phenolic hydroxyl group and carbonyl, these groups are also expected to be used for modification
Graphene.
Rutin modification carbon nanotube and the mechanism of graphene are to be grafted onto carbon nanometer using the active group on rutin
Pipe and graphene surface, or by the π-π non-covalent bond effect of phenyl ring and carbon nanotube and graphene on rutin to
It is adsorbed onto the surface of carbon nanotube and graphene, rutin contains many oxygen-containing functional groups (hydroxyl, epoxy group and carbonyl), these officials
Can roll into a ball has very high reactivity, and with the mechanism of carbon nanotube and graphene, these functional groups can receive with carbon
Mitron, graphite alkene reaction, play the role of carbon nano-tube modified and graphene；Rutin molecule is containing there are two phenyl ring, benzene ring structures
Also the surface of carbon nanotube, graphene can also be adsorbed on by π-π non-covalent bond effect with carbon nanotube, graphene.
Different modified gas can generate different modified effects when corona treatment, and it is suitable to be selected according to actual requirement
Modified gas be the key that obtain good dispersion effect.Furthermore plasma-treating technology parameter can also produce dispersion effect
Raw critically important influence handles time, vacuum degree etc. such as plasma treatment voltage, and good dispersion effect needs various factors
Collective effect.
Preferably, the plasma used when handling graphene is Ar, NH3And O2One of three kinds of plasmas are several
Kind.Using it is single one or more be jointly processed by graphene and realize and be modified, it is ensured that the validity of graphene surface modification and sufficiently
Property.Ar bombards the surface of carbon nanotube and graphene as inert gas, although discord graphite alkene reaction, can produce work
Property site, so as to subsequent modification.And NH3And O2Plasma can then introduce the functional groups such as-OH ,-COOH, improve stone
The reactivity of black alkene.Further, preferably Ar/NH3Plasma.Above-mentioned plasma is by Ar, NH3And O2Gas passes through
The plasma that plasma generator generates can obtain single plasma using pure gas ingredient as needed,
The plasma that can be mixed using blending constituent.Graphene tiling is placed in clean vessel, together with vessel
Plasma bombardment is carried out to graphene.
Preferably, corona treatment power is 20W~150W.Plasma power is too low, and plasma bombardment power is weak,
Graphene surface etching is few, and the active site that can graft functional group is just few；Power is excessively high, and plasma activates graphene surface
Effect has certain upper limit, is further added by that power activation effect is unobvious, and the excessively high plasma bombardment of power is in graphene table
Face can cause the destruction of graphene surface, and quality of graphene is caused to reduce.Further preferably 40~80W, in conjunction with inventor's
When a large number of experiments research is controlled within this range, graphene surface activation effect is best.Optimal plasma power is 60W.
Preferably, plasma treatment time is 2min~15min.Control plasma treatment time at 2-15 minutes,
It can effectively guarantee plasma for the adequacy of the activation of graphene, and it is not good to avoid overlong time from causing
Side effect and excessive energy consumption.Further, preferably plasma treatment time is 5~8min, more accurate control etc.
Within the scope of gas ions Best Times, reach the optimal target of activation effect.
Preferably, the ratio between the weight of the graphene and the volume of rutin aqueous solution are 0.05~0.5g：20~60mL.Through
A large number of experiments research of inventor is crossed, in the grapheme modified technique of rutin needs that graphene itself is combined potentially to combine energy
Power and rutin molecule carry out dual consideration for the new and binding ability of graphene, and the graphene that aforementioned proportion is arranged can
With preferably and rutin mix, avoid extra rutin can not with graphene in conjunction with and cause surface contamination, both improve graphene
With the joint efficiency of rutin, and improve both combine modified product performance.Further preferably 0.05~0.2g：30~
50mL optimizes and revises the usage ratio of rutin and graphene, realizes more preferably quality.Most preferably preferably 0.1g：40mL.By with
It is upper preferred, it can be further improved the dispersibility of graphene.
Preferably, the time of the standing is 12~30h.For rutin stronger acids, property is more mild, upon standing between
Less than 12h, the reaction time is too short, is unfavorable for the abundant combination of rutin and graphene；It is longer than 30h between upon standing, modification is made
With not being further added by.Further preferably 20~25h；Best is preferably for 24 hours.
Preferably, the vacuum drying temperature is 60 DEG C~80 DEG C.When vacuum drying temperature is lower than 60 DEG C, drying is imitated
Rate is low；When drying temperature be higher than 80 DEG C, will lead to non-chemical effect between the damage and rutin and graphene of grafted functional group
Decrease.Further preferably 60~70 DEG C, best preferably 60 DEG C.
Preferably, the vacuum drying time is 1~3h.When vacuum drying time is less than 1h, graphene drying is endless
Entirely, the performance of graphene is influenced and to its phenetic analysis；Be longer than 3h between when drying, will lead to grafted functional group damage and
The decrease of non-chemical effect between rutin and graphene.Further preferably 1~2h, interior range effect is good in this time frame,
Substantially the Van der Waals force bond strength without residual moisture, and between rutin and graphene is kept preferably, and modification quality is more
It is excellent.Most preferably preferably 2h.
The graphene is single-layer graphene or multi-layer graphene.The graphene of modifying and decorating of the present invention is not limited to single layer
Graphene is also possible to multi-layer graphene, equally has single-layer graphene in the multi-layer graphene of nanometer or micron-scale rank
Fine quality, and during modification, multilayer mating surface is modified, and inside keeps original graphene special substantially
Property, have modified good, the good feature of inherent characteristic retentivity.
Preferably, the concentration of rutin is 0.001~18 μ g/mL in rutin aqueous solution.Further, the rutin aqueous solution by
Deionized water is prepared.Applicant has found that, when the concentration of rutin aqueous solution is too small, graphene surface can be due to transferring through test of many times
The functional group connect is very little, to influence the raising of its dispersibility, it is difficult to reach the set goal value.Although as rutin is water-soluble
The amount of the increase of liquid concentration, the rutin of graphene surface absorption will increase, when the concentration of rutin aqueous solution is greater than 18 μ g/mL,
Will appear the rutin molecule that can not be largely adsorbed onto graphene surface in solution, these dispersion rutin molecules in the solution can and
The rutin interaction of molecules adsorbed causes the rutin molecule adsorbed on the surface of graphene to fall off.Therefore, rutin solution
Concentration is excessive, generates very detrimental effect to the π-π suction-operated between rutin and graphene instead.It is preferred that the rutin water
The concentration of solution is 0.02~2 μ g/mL, and the rutin for 0.02,0.2, the 2 μ g/mL isoconcentrations that can be enumerated is applied.Work as rutin
When concentration is too big, the rutin of graphene surface can be made to be desorbed, the phenomenon that modification amount reduction occur, can not play and mention
The effect of high graphene dispersion.It is highly preferred that the concentration of the rutin aqueous solution is 0.02~0.2 μ g/mL, most preferably,
The concentration of the rutin aqueous solution is 0.02 μ g/mL.
Compared with prior art, beneficial effects of the present invention：
(1) modified graphene product of the invention, is obtained by rutin modified graphene, and combination fastness is good, modified
Graphene dispersion is promoted significantly, and the excellent physicochemical property of graphene inherently is effectively maintained.
(2) modified graphene product of the invention, raw material are natural products raw material and natural mineral raw, have source wide
It is general, the characteristics of easily acquisition.In conjunction with the easy implementation that method of modifying itself has, there is efficient feature good industrialization to answer
Potentiality.
(3) method of modified graphene of the present invention utilizes corona treatment graphene product, single to graphene surface
Activated carbon has good cleaning action.The graphene sample degree of purity handled by the method for the present invention is high, modified application direction
It is varied.
(4) graphene is passed through corona treatment by the method for modified graphene of the present invention, increases live on the surface of graphene
Property site, provides possibility for subsequent grafting more polyfunctional group.Corresponding graphene product can be very good to combine upper corresponding reed
Fourth molecule, compared with without the processed graphene of rutin, the graphene dispersion is good, while impurities greatly reduce.
(5) method of modified graphene of the present invention maintains the integrality of graphene well, overcomes at traditional strong acid
The draw ratio of graphene seriously reduces after reason, the defect reduced so as to cause graphene properties.
(6) method of modified graphene of the present invention does not generate the pollutants such as waste water, spent acid, while simple process, technique ginseng
Number is easy to control.
Detailed description of the invention：
Fig. 1
It is the graphene sample TEM figure without any processing.
Fig. 2 is graphene Fourier transform infrared spectroscopy figure after gas with various corona treatment.
Fig. 3 is graphene Fourier transform infrared spectroscopy figure after the processing of various concentration rutin aqueous solution.
Fig. 4 is the graphene SEM figure used in the present invention without any processing.
Fig. 5 is that graphene is schemed through rutin aqueous solution treated SEM.
Fig. 6 is that graphene is schemed through rutin aqueous solution treated SEM and corresponding points EDX.
Specific embodiment
Below with reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood
It is all that this is belonged to based on the technology that the content of present invention is realized for the scope of the above subject matter of the present invention is limited to the following embodiments
The range of invention.
Multi-layer graphene involved in the embodiment of the present invention and single-layer graphene are purchased from Chinese Academy of Sciences's Chengdu organic chemistry
Co., Ltd.Transmission electron microscope (TEM) characterization is carried out to original graphene product, as a result such as Fig. 1
It is shown.
Embodiment 1
By the uniform spreading of a small amount of multi-layer graphene in clean beaker bottom, graphene ribbon beaker is placed into corona treatment
Intracavitary, setting power is 60W, and the processing time is 10min, processing gas Ar.
Embodiment 2
By the uniform spreading of a small amount of multi-layer graphene in clean beaker bottom, graphene ribbon beaker is placed into corona treatment
It is intracavitary, setting power be 60W, be first passed through Ar processing the time be 5min, after be passed through O2The processing time is 5min, and the processing time is total
10min。
Embodiment 3
By the uniform spreading of a small amount of multi-layer graphene in clean beaker bottom, graphene ribbon beaker is placed into corona treatment
It is intracavitary, setting power be 60W, be first passed through Ar processing the time be 5min, after be passed through NH3The processing time is 5min, and the processing time is total
10min。
Fig. 1 be graphene without any processing and after different disposal gas plasma process graphene infrared light
Spectral curve.Spectral line 1 is original graphite alkene characterization curve in figure, and spectral line 2 is that argon plasma treated graphene characterization is bent
Line, spectral line 3 are the graphene characterization curves after argon gas and oxygen mix corona treatment, and spectral line 4 is argon gas and ammonia mixing
Graphene after corona treatment characterizes curve.Compare four curves, it can be seen that by the graphene of corona treatment
The intensity at the infrared curve peak that represents hydroxyl and carboxyl have certain enhancing, wherein Ar-NH3The graphene of corona treatment
Infrared curve peak intensity it is most strong, the peak intensities of 2,3,4 curves is incremented by with this, this may be because by argon plasma
Bombardment carries out oxygen, ammonia plasma treatment bombardment, more functional groups on the surface graft of graphene, so that graphene again
Dispersion effect it is more preferable.
Embodiment 4
Multi-layer graphene is added in the rutin aqueous solution of 0.02 μ g/mL, is uniformly dispersed, wherein the weight of graphene with
The ratio between volume of rutin aqueous solution is 0.1g：40mL；Stand for 24 hours, filtering, take filter residue to be dried in vacuo 2h at 60 DEG C, obtain through
The graphene of surface modification.
The graphene 0.1g of surface modification prepared by the present embodiment 4 is dispersed in 100mL deionized water, is stood
It after 5 days, precipitates gradually increase under the effect of gravity, but still maintain dispersity between graphene, there is no reuniting；Simultaneously
It is compared with unmodified graphene, is precipitated after standing 1 day, and agglomeration occurs between graphene, show reality
The graphene for applying the surface modification of the preparation of example 4 has excellent dispersibility.
Embodiment 5
Multi-layer graphene is added in the rutin aqueous solution of 0.2 μ g/mL, is uniformly dispersed, wherein the weight of graphene with
The ratio between volume of rutin aqueous solution is 0.1g：40mL；Stand for 24 hours, filtering, take filter residue to be dried in vacuo 2h at 60 DEG C, obtain through
The graphene of surface modification.
The graphene 0.1g of surface modification prepared by the present embodiment 5 is dispersed in 100mL deionized water, is stood
It after 3 days, precipitates gradually increase under the effect of gravity, but still maintain dispersity between graphene, there is no reuniting.Show
The graphene of surface modification prepared by embodiment 5 has excellent dispersibility.
Embodiment 6
Multi-layer graphene is added in the rutin aqueous solution of 2 μ g/mL, is uniformly dispersed, wherein the weight of graphene and reed
The ratio between volume of fourth aqueous solution is 0.1g：40mL；It stands for 24 hours, filtering takes filter residue to be dried in vacuo 2h at 60 DEG C, obtains through table
The graphene of face modification.
The graphene 0.1g of surface modification manufactured in the present embodiment is dispersed in 100mL deionized water, stands 2
It after it, precipitates gradually increase under the effect of gravity, but still maintain dispersity between graphene, there is no reuniting.Show
The graphene of surface modification prepared by embodiment 6 has excellent dispersibility.
By embodiment 4~6 it is found that surface modification prepared by embodiment 4 graphene stand 5 days after just gravity work
Precipitating is increasingly generated under, and still keeps dispersity between graphene well, there is no reuniting, and embodiment 5 and 6
The graphene of the surface modification of preparation gradually generates precipitating under the effect of gravity after 2~3 days, therefore described in embodiment 4
Method be substantially better than method described in embodiment 5 and 6.
Fig. 3 is through various concentration rutin aqueous solution treated graphene FTIR spectrum figure.Simultaneously using without
The graphene (pure CNFs) of rutin aqueous solution processing compares.From figure 3, it can be seen that the graphene without the processing of rutin aqueous solution
Fourier transform infrared spectroscopy figure peak shape it is wider and peak value is weaker；And through rutin aqueous solution (0.02 μ g/mL, 0.2 μ g/mL,
2 μ g/mL) treated graphene is in 3430cm-1And 1640cm-1Nearby there is stronger absorption peak, is belonging respectively to stretching for-O-H
Contracting vibration absorption peak and bending vibration absorption peak, wherein the peak value of 0.02 μ g/mL is most strong；It can be seen that graphene surface is grafted
The either more rutins of more functional groups are adsorbed in graphene surface by non-chemical effect, to improve graphene
Dispersibility.And continue to increase the concentration of rutin aqueous solution to 2 μ g/mL, 3430cm-1And 1640cm-1Neighbouring absorption peak is basic
With the graphene handled without rutin aqueous solution, this is because after the amount of the rutin of graphene surface absorption reaches saturation, dispersion
Extra rutin molecule in the solution interferes the rutin molecule adsorbed, it is caused to fall off, thus, rutin solution it is dense
After spending greatly, very detrimental effect is generated to the π-π suction-operated between rutin and graphene, leads to modification amount drop occur
Low phenomenon, and then influence the dispersibility of modifying and decorating graphene.
According to embodiment 4 it is found that the graphene handled through 0.02 μ g/mL rutin aqueous solution, ability is in gravity after standing five days
Under the action of increasingly generate precipitating, and good dispersity is still maintained between graphene, there is no reuniting.And according to reality
From the point of view of the case where applying example 5 and embodiment 6 performance, after 3 days i.e. gradually through 0.2 μ g/mL rutin aqueous solution treated graphene
Precipitating is generated under the effect of gravity, after through 2 μ g/mL rutin aqueous solutions, treated graphene standing 1 day, is sunk under the effect of gravity
Shallow lake is gradually increased, and slight agglomeration gradually occurs for graphene.Simultaneously according to FTIR spectrum figure it is found that through 0.02 μ
G/mL rutin aqueous solution treated graphene surface has more functional groups, to further improve the dispersion of graphene
Property.To sum up, for 0.02 μ g/mL compared with 0.2 μ g/mL and 2 μ g/mL, difference is obvious, achieves unexpected effect, therefore
0.02 μ g/mL is the optium concentration of rutin aqueous solution of the present invention.
The above analysis is as it can be seen that be either modified stone as a result, from the point of view of the result that still conventional disperse is tested from spectral characterization
The dispersion sex expression of black alkene is consistent, relevant with the concentration of bright rutin solution, but is not the bigger the better.
Fig. 4 is low range SEM image of the graphene without any processing：Fig. 4 left figure is put without any processing graphene
Big 5000 times of SEM figure；Fig. 4 right figure is the SEM figure for amplifying 2000 times without any processing graphene.Fig. 5 is graphene through reed
The high magnification SEM image of fourth aqueous solution before and after the processing：Fig. 5 left figure is that graphene is put after the processing of 0.02 μ g/mL rutin aqueous solution
Big 10,000 times of SEM figure；Fig. 5 right figure is the SEM that graphene amplifies 20,000 times after the processing of 0.02 μ g/mL rutin aqueous solution
Figure.As can be seen from Figure 4 and Figure 5, the graphene without the processing of rutin aqueous solution is at reunion shape, and edge volume is stuck up, bad dispersibility；And
Through rutin aqueous solution, treated that graphene dispersion is improved well, can obviously observe under high magnification many open and flat
Graphene, while the average area of graphene is compared with before modification, variation less, that is, the specific surface area before maintaining modification,
It is not shredded.After the processing of rutin aqueous solution, graphene surface finish increases, and impurity significantly reduces；Show the method for the present invention
It can be with purifying graphene.
Fig. 6 is that graphene is schemed through rutin aqueous solution treated SEM and corresponding points EDX.Fig. 6 right figure is graphene through rutin
Aqueous solution treated EDX figure.By Fig. 6 right figure it is found that graphene is after the processing of rutin aqueous solution, impurity element greatly reduces,
There is only two kinds of elements of O, C, contained by impurity greatly reduce.
Claims (3)
1. a kind of modified graphene, which is characterized in that it is obtained by rutin modified graphene；
The method of rutin modified graphene is as follows：
（1）Graphene is taken to be handled with plasma its surface, corona treatment power is 20W ~ 150W, handles the time
2min~15min；The plasma is Ar-O2Or Ar-NH3Plasma；
（2）Graphene Jing Guo corona treatment is added in rutin aqueous solution, is uniformly dispersed, is stood；The graphene
Weight and the ratio between the volume of rutin aqueous solution be 0.05 ~ 0.5g：20~60mL；
（3）Solution is filtered, filter residue is taken to be dried in vacuo, obtains the graphene of surface modification.
2. modified graphene according to claim 1, it is characterised in that：Graphene is single-layer graphene or Multi-layer graphite
Alkene.
3. modified graphene according to claim 1, it is characterised in that：The concentration of rutin is 0.001 ~ 18 in rutin aqueous solution
μg/mL。
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