CN1165209A - Order arranged carbon Nanometre tube and its preparing method and special device - Google Patents
Order arranged carbon Nanometre tube and its preparing method and special device Download PDFInfo
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- CN1165209A CN1165209A CN 96120461 CN96120461A CN1165209A CN 1165209 A CN1165209 A CN 1165209A CN 96120461 CN96120461 CN 96120461 CN 96120461 A CN96120461 A CN 96120461A CN 1165209 A CN1165209 A CN 1165209A
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Abstract
The present invention relates to an orderly arranged nm-class carbon tube and its preparing method, and is aimed at realize the orderly arranging growth of nm-class carbon tube by controlling gas' flow speed and reaction speed to obtain high-crystallization, high-purity and high-output nm-class carbon tube. The SiO2 gel containing nm-class particles of transition metal oxide is reduced in hydrogen and nitrogen to make microporous substrate, which is then loaded in reactor. By the catalytic effec of said nm-class particles in micropores and the template effect of micropores, the orderly arranged nm-class carbon tube with 7-30 nm in diameter, 20-100 microns in length and more than 99% of purity is grown in the micropore by means of chemical gas deposition.
Description
The present invention relates to a kind of nano material, particularly relate to a kind of carbon nano-tube material and its preparation method and isolated plant of ordered arrangement.
Carbon nanotube is the carbon pipe that a kind of diameter of being made up of carbon atom is a nanometer scale, is by Iijima[Nature 354,56 (1991) in 1991] find first in the product at arc-over.Carbon nanotube has caused the great interest of scientists as a kind of novel low-dimensional materials.The special construction of carbon nanotube has determined it to have high-tensile and high heat stability.Along with the variation of length, diameter and the spiral way of carbon nanotube, carbon nanotube can present metallicity or semi-metal.Carbon nanotube has good electronic transport performance.Other element packed into can be made into low-dimensional materials in the carbon nanotube with property.Because the machinery and the electrical properties of carbon nanotube uniqueness are expected it and play a significant role in fields such as nanoelectronics, Materials science, biology, chemistry.People such as Ebbesen are at document T.W.Ebbesen, P.M.Ajayan, Nature 356, (1992) 220, the method for preparing carbon nanotube described in the Large-scale synthesis of carbon nanotubes is: utilize two graphite rods to be electrode, one of them diameter be 6mm as anode, another diameter be 9mm as negative electrode, be placed in the same discharge chamber.Charging into 500 torr helium in the discharge chamber, is 10～18 volts at voltage, under about 100 ampere electric current conditions, carries out direct-current discharge.Constantly the graphite anode that consumes is forming carbon nanotube under the deposition on the negative electrode.Carbon nanotube is embedded in formed sedimental inside.Be approximately 25% by graphite to the transformation efficiency of carbon nanotube.This method has several main drawbacks: the output of (1) carbon nanotube is very low.(2) formed carbon nanotube is not orderly, but mixed in together with other carbon nano-particle, therefore causes the purity of carbon nanotube very low, is difficult to purify.(3) carbon nanotube forms in high-temperature plasma, and the direction of growth of carbon nanotube is uncontrollable, and formed carbon nanotube is unordered confusion.(4) carbon nanotube of Xing Chenging is shorter.And for example people such as Ivanov is at V.Ivanov, J.B.Nagy, Ph.Lambin, A.Lucas, X.B.Zhang, X.F.Zhang, D.Bernaerts, G.Van.Tendeloo, S.Amelinckx, J.Van Landuyt, ChemicalPhysics Letters 223, the preparation method who describes in (1994) 329 documents is: the silica gel that will have about 9nm micropore soaks in cobalt nitrate aqueous solution and obtains containing catalyst cobalt particulate substrate.Then, 500 ℃ of calcining and reductase 12 and 8 hours respectively.Again acetylene gas is fed in the Reaktionsofen,, grow carbon nanotube at 500-800 ℃ of reaction several hrs.The main drawback of this method is: the having many bends or curves weave in of (1) these carbon nanotubes, the carbon nanotube of formation chaotic distribution.(2) have the amorphous carbon particle on the surface of some carbon nanotube, and often include granules of catalyst, influenced the purity of carbon nanotube in the inside of carbon nanotube.(3) also very low with the prepared carbon nanotube output of this method.
The object of the invention is to overcome the shortcoming and defect in the above-mentioned prior art, for the ordered arrangement growth of controlling carbon nanotube effectively with by controls reaction speed, and preparation crystallization degree height, purity height and the high carbon nanotube of output.Thereby provide a kind of substrate that is embedded in metal nanoparticle in silicon dioxide substrates with orientation micropore, it is indoor that substrate is placed on carbon nano tube growth, utilize carbonaceous gas, by chemical vapour deposition, with the template effect of catalytic effect that utilizes metal nanoparticle and micropore, on substrate, prepare the method for the carbon nanotube of ordered arrangement.
The object of the present invention is achieved like this:
The carbon nanotube of ordered arrangement provided by the invention by purity up to more than 99%, crystallization degree is high, diameter is several nanometers or tens nanometers carbon nanotube forms.
2. the present invention's device of being used to prepare carbon nanotube is mainly by body of heater, gas distributing system, and vacuum system three parts are formed.The annexation of its each several part and effect are as follows: the center of (1) body of heater is the carbon nano tube growth chamber, and it puts into tube furnace, the reaction chamber of being made by stainless-steel pipe or silica tube.Can make the carbon nano tube growth chamber remain on different temperature by heating unit.Be beneficial to the growth of carbon nanotube.(2) gas distributing system.Form by gas circuit and mass-flow gas meter.It is by the end of vacuum rubber pipe coupling in the carbon nano tube growth chamber.Utilize it can adjust kind, proportioning and the flow of carbon nano tube growth indoor gas.(3) vacuum system.Form by mechanical pump and diffusion pump.It is connected the other end of carbon nano tube growth chamber by vacuum butterfly valve and pressure regulator valve.Utilize it can regulate indoor vacuum tightness of carbon nano tube growth and reaction gas pressure.
3. the invention provides a kind of method for preparing the carbon nanotube of ordered arrangement, this method is divided into the preparation of the mesoporous silica substrate that contains transition metal nanoparticles (being catalysed particulate) and preparation two portions of carbon nanotube:
(1). preparation contains the mesoporous silica substrate of transition metal nanoparticles.
Have the silicon dioxide substrates in uniform distribution orientation hole with the sol-gel process preparation, in the hole, embed transition metal nanoparticles:
(1). the oxymuriate of transition metal or nitrate or oxalate are dissolved in the distilled water, are mixed with concentration and are 0.1～2 mole solution.Wherein oxymuriate comprises: iron(ic) chloride, cobalt chloride, nickelous chloride etc.; Nitrate comprises: iron nitrate, Xiao Suangu, nickelous nitrate etc.; Oxalate comprises: ironic oxalate, cobalt oxalate, nickelous oxalate etc.
(2). it is in 50～80 ℃ the distilled water that the oxymuriate of transition metal or nitrate or oxalate solution are slowly splashed into constant temperature, is mixed with 0.1～2 mole colloidal sol.Wherein, used oxymuriate or nitrate or oxalate solution several saline solutions for being mentioned in (1).
(3). above-mentioned solution (1) that will prepare or colloidal sol (2) and tetraethoxy and ethanol is (8～16) in molar ratio: 1: mix (4～6), fully stirs half an hour.In per 30 milliliters of mixed solutions, add about 0.1～0.3 milliliter of hydrofluoric acid or hydrochloric acid, continue to stir 15-30 minute.Form silicon dioxide gel.
Can silicon dioxide gel be made substrate with different means:
A kind of way is: under constant temperature 20-30 ℃ condition, make the silicon dioxide gel of making in above-mentioned (3) solidify the formation silica dioxide gel; Silica dioxide gel is placed in the thermostatic electric heater under 40-70 ℃ of temperature dry 7-10 days; Then, the carbon nano tube growth that silica dioxide gel is placed on this isolated plant is indoor, under 350-500 ℃ steady temperature, and 10
-1-10
-2In the torr vacuum, calcined 10-15 hour; Silica dioxide gel after will calcining again reduces in mobile hydrogen and the nitrogen mixture body under 450-550 ℃ of temperature, makes the transition metal oxide nano particle in the micropore in the silica dioxide gel be reduced to the elemental metals nano particle.Hydrogen and nitrogen 0.5/10～2/10 mix by volume, and the flow velocity of mixed gas is 80～150 ml/min, and the pressure of carbon nanotube reaction indoor gas is 100～300 torrs, and the recovery time is 5-10 hour.Obtain having the silicon dioxide substrates in uniform distribution orientation hole, containing diameter in the hole is several transition metal particles to tens nanometers.
Another method for preparing silicon dioxide substrates is: will handle clean quartz plate or tinsel and be fixed on and get rid of on the film machine, and the silicon dioxide gel for preparing in above-mentioned (3) be dropped in get rid of into the layer of silicon dioxide gel-film on quartz plate or the tinsel; With the silica dioxide gel film under 20～30 ℃ of temperature of constant temperature, dry 3～5 days; It is indoor that dried silica dioxide gel film is placed on foregoing carbon nano tube growth, in 450 ℃ of constant temperature, is evacuated to 10
-2Torr was calcined 10 hours; Then, it is indoor that the silica dioxide gel film after the calcining is put into 550 ℃ carbon nano tube growth, feeds the mixed gas of hydrogen and nitrogen, makes that the transition metal oxide nano particle is reduced into the elemental metals nano particle in the silica dioxide gel film.The volume ratio of hydrogen and nitrogen is 1: 10, and flow velocity is 110 ml/min, and the pressure of carbon nano tube growth indoor gas is 180 torrs, and the recovery time is 5 hours.Obtain having the silicon dioxide substrates in uniform distribution orientation hole, containing diameter in the hole is several transition metal particles to tens nanometers.
Utilize the prepared Substrate Area of this method bigger, can be high temperature resistant to 800 ℃.By different stoicheiometries and different heat treatment processes, can prepare substrate with different apertures.Increase with oxymuriate or the nitrate or the oxalate solution content of transition metal, the content of water also can increase, and the hydrolysis reaction of tetraethoxy can be accelerated, and the time that forms colloidal sol shortens, after a large amount of water is evaporated, in silica dioxide gel, can form the bigger micropore of diameter; With the increase of amount of alcohol, the hydrolysis reaction speed of tetraethoxy slows down, and it is slow that the speed of growth of colloidal particle becomes, and can form the less micropore of diameter in silica dioxide gel; When thermal treatment temp increased, the volume of silica dioxide gel will further shrink, and micro pore volume wherein also can correspondingly dwindle.
(2). on the mesoporous silica substrate, carry out the step of carbon nanotube of the ordered arrangement of growing high density:
The above-mentioned silicon dioxide substrates with uniform distribution orientation hole that has prepared is put into the sample box of apparatus of the present invention, and utilizing specimen holder that substrate is delivered to temperature is in 600～700 ℃ the carbon nano tube growth chamber.After treating that substrate reaches constant temperature, the elder brother who feeds acetylene and nitrogen closes gas to Reaktionsofen.Acetylene and nitrogen is (1～2) by volume: 10 mix, and the flow velocity of mixed gas is 80～150 ml/min, and the indoor gaseous tension of carbon nano tube growth is 100～300 torrs, and insulation is at 600～700 ℃, and the reaction times is 1-5 hour.By the flow velocity and the pressure of controlling carbon nanotube growth room reaction gases, can prepare crystallization degree height, carbon nanotube that purity is high.If the indoor reaction gas pressure of carbon nano tube growth is too high, the density that is the carbon nano tube growth indoor gas is too high, then the carbon atom density that is decomposed to form by acetylene gas also can be high, a large amount of carbon atom rapid accumulation is on transition metal nanoparticles (being granules of catalyst), the carbon nanotube crystallization degree of Xing Chenging is low like this, and the surface of carbon nanotube is with many amorphous carbons.Otherwise if the indoor reaction gas pressure of carbon nano tube growth is too low, then the carbon atom density that is decomposed to form by acetylene gas also can be very low, and at this moment the speed of growth of carbon nanotube can be very slow, is unfavorable for improving the output of carbon nanotube.And under aforementioned preparation condition of the present invention, then can make crystallization degree height, purity height and the high carbon nanotube of output.The purity of carbon nanotube is up to more than 99%, and the length of carbon nanotube is 20～100 microns, and diameter is 7～30 nanometers.
Utilize the carbon nanotube of method preparation of the present invention to have following performance:
1. carbon nanotube has very high tensile strength and low-gravity, therefore can be used for the strongthener of other material.
2. carbon nanotube has the capillary syphonic effect, oxide compound, the carbide of metals such as lead, caesium or some metal can be filled in the carbon nanotube.Also some metal or metal oxide or other material bag can be attached on the carbon nanotube, make nano material with property.
3. has excellent electronic transport characteristic.According to the different structure of carbon nanotube, it can present metallicity or semi-metal or nonmetal character.
Superiority of the present invention:
(1). it is simple to utilize device of the present invention to prepare the carbon nanotube process, easy to operate.Temperature, the gentle pressure-controlled of air-flow are accurate, and preparation process is easy to repetition.Enlarge the volume of carbon nano tube growth chamber and the production carbon nanotube that the constant temperature scope can be a large amount of.
(2). utilize the silicon dioxide substrates of method preparation of the present invention, transition metal nanoparticles (being granules of catalyst) can be fixed in the orientations hole of substrate.In the process of growth of carbon nanotube, these granules of catalyst are difficult for being attached in the carbon nanotube by bag, have guaranteed the purity of carbon nanotube.Utilization has the silicon dioxide substrates of different micropores and carries out the growth of carbon nanotube, can obtain the carbon nanotube of different diameter.On the bulk silicon dioxide substrates, can prepare the carbon nanotube of large-area ordered arrangement.Be convenient to the measurement and the application of carbon nanotube performance.
(3). carbon nanotube ordered arrangement, the diameter that utilizes method of the present invention to prepare is even, purity is high (more than 99%).The output height of carbon nanotube, the degree of graphitization height.Length according to the length may command carbon nanotube in reaction times.Easy and the substrate separation of carbon nanotube.As Fig. 2, be the photo of the carbon nanotube of the ordered arrangement that grows from the mesoporous silica substrate taken of scanning electronic microscope.As Fig. 3, the photo of the high-density of utilizing method preparation of the present invention of taking for scanning electronic microscope, the carbon nanotube of highly purified ordered arrangement.As Fig. 4, the high resolution picture of the carbon nanotube of taking for transmission electron microscope that utilizes method preparation of the present invention.Can see the graphite linings striped picture on the carbon nanotube tube wall, prove the degree of graphitization height of carbon nanotube.
Below in conjunction with drawings and Examples the present invention is described in detail:
Fig. 1 is the grow device synoptic diagram of ordered arrangement carbon nanotube of the present invention.
Fig. 2 is the carbon that grows from the mesoporous silica substrate that scanning electronic microscope is taken
The photo of nanotube.
The high-density of utilizing method preparation of the present invention that Fig. 3 takes for scanning electronic microscope,
The photo of the carbon nanotube of highly purified ordered arrangement.
The carbon nanotube that utilizes method preparation of the present invention that Fig. 4 takes for transmission electron microscope
High resolution picture.Can see the graphite linings striped picture on the carbon nanotube tube wall.
Being described as follows of drawing 1:
(1)-and gas circuit, (2)-gas controller, (3)-carbon nano tube growth chamber,
(4)-and heating unit, (5)-sample box, (6)-sample, (7)-temperature controller,
(8)-and tensimeter, (9)-specimen holder, (10)-pressure regulator valve,
(11)-and butterfly valve, (12)-vacuum unit, (13)-thermopair.
Device of the present invention mainly is made up of body of heater, air distribution system, vacuum system three parts. Its In, body of heater is by carbon nano tube growth chamber (3), heater (4) and (7), sample Box (5), specimen holder (9) and thermocouple (13) form. Air distribution system is by gas circuit (1) Form with gas controller (2). Vacuum system is by pressure-regulating valve (10), butterfly valve (11) Form with vacuum unit (12). Contact and effect in the each several part between the unit: in the body of heater Section is a carbon nano tube growth chamber (3) of being made by stainless-steel pipe or quartz ampoule, this growth The chamber is by putting in tubular heater (4). The indoor temperature of carbon nano tube growth is by temperature controller (model: EUROTHERM 818) (7) are control accurately. Utilize the specimen holder (9) can After reaching desired temperature in the carbon nano tube growth chamber, sample is sent into carbon nano tube growth again The chamber. Thermocouple (13) is fixed in the specimen holder (9), by thermocouple (13) monitoring sample Temperature, can guarantee behind the sample thermally equivalent, to pass into again reacting gas. Air distribution system is by gas Road (1) and mass-flow gas meter (2) form, and by the vacuum rubber pipe they are serially connected in One end of carbon nano tube growth chamber. By mass-flow gas meter can accurately control gas composition and The gas pressure that carbon nano tube growth is indoor. Vacuum unit (12) is by pressure-regulating valve (10) And butterfly valve (11) is installed in the other end of carbon nano tube growth chamber (3), and its effect is to keep The pressure of the vacuum that carbon nano tube growth is indoor and conditioned reaction gas.
Embodiment one:
The preparation diameter is 30 nanometers in the device of the carbon nano-tube of special use of the present invention, and length is 50 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
1。Preparation earlier contains the silicon dioxide substrates that the aperture is 30 nanometer micropores:
(1) 8.1 milliliters of 10 milliliters of .0.1 volumetric molar concentration iron nitrate solutions and 7.8 milliliters of tetraethoxys (analytical pure) and ethanol (analytical pure) mixed in 16: 1: 4 in molar ratio, fully stir about half an hour.Then, slowly add about 0.2 milliliter hydrofluoric acid (analytical pure), further stirred 15 minutes.Solidify the formation silica dioxide gel for 25 ℃ at constant temperature, be placed in the thermostatic electric heater following dry 7 days again in 60 ℃.
(2). the carbon nano tube growth of dried silica dioxide gel being put into apparatus of the present invention is indoor, under 400 ℃ of temperature, is evacuated to 10
-2Under the torr, calcined 10 hours.
(3). the silica dioxide gel after will calcining is put into sample box, and it is indoor with specimen holder sample to be sent into 550 ℃ carbon nano tube growth.Feed the mixed gas of hydrogen and nitrogen, make silicon-dioxide coagulate the simple substance particle that ferric oxide particles in the silica gel is reduced into iron.The volume ratio of hydrogen and nitrogen is 1: 10, and the control flow velocity is 110 ml/min, and the pressure of carbon nano tube growth indoor gas maintains 180 torrs, and the recovery time is 5 hours.Obtain containing the silicon dioxide substrates of micropore, the aperture of micropore is 30 nanometers, contains the iron catalyst particle at micropore.
2。The carbon nanotube of growth ordered arrangement on the mesoporous silica substrate of above-mentioned preparation:
It is in 700 ℃ of Reaktionsofens that the above-mentioned silicon dioxide substrates with micropore for preparing is placed on temperature, feed the mixed gas of acetylene and nitrogen, the volume ratio of acetylene and nitrogen is 1: 10, and flow velocity is 110 ml/min, and the pressure of carbon nano tube growth indoor gas is 180 torrs.Reaction times is 2 hours, generates diameter and is about 30 nanometers, and purity is up to more than 99%, the carbon nanotube of discrete ordered arrangement.The length of carbon nanotube can reach 50 microns.
Embodiment two:
In the above embodiments 1 device, the preparation diameter is 10 nanometers, and length is 70 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%:
1。Preparation earlier contains the silicon dioxide substrates that the aperture is 10 nanometer micropores:
(1) 24.3 milliliters of 10 milliliters of .2 volumetric molar concentration iron nitrate solutions and 15.5 milliliters of tetraethoxys (analytical pure) and ethanol (analytical pure) mixed in 8: 1: 6 in molar ratio, fully stirred half an hour.Then, slowly add about 0.3 milliliter hydrochloric acid (analytical pure), fully stir.After 25 ℃ of constant temperature solidify the formation silica dioxide gel, following dry 10 days in 50 ℃ of constant temperature again.
(2). the carbon nano tube growth of dried silica dioxide gel being put into apparatus of the present invention is indoor, under 450 ℃ of temperature of constant temperature, is evacuated to 10
-2Under the torr, calcined 15 hours.
(3). the silica dioxide gel after will calcining is put into sample box, and it is indoor with specimen holder sample to be sent into 500 ℃ carbon nano tube growth.Feed the mixed gas of hydrogen and nitrogen, make ferric oxide particles reduction in the silica dioxide gel.The volume ratio of hydrogen and nitrogen is 2: 10, and the control flow velocity is 80 ml/min, and the pressure of growth indoor gas is 100 torrs, and the recovery time is 5 hours.Obtain containing the silicon dioxide substrates of micropore, the aperture of micropore is 10 nanometers, contains the iron catalyst particle at micropore.
2。The carbon nanotube of growth ordered arrangement on the mesoporous silica substrate of above-mentioned preparation:
It is that 650 ℃ of carbon nano tube growths are indoor that the above-mentioned silicon dioxide substrates for preparing is placed on temperature, feeds the mixed gas of acetylene and nitrogen, and the volume ratio of acetylene and nitrogen is 2: 10, and flow velocity is 80 ml/min, and the pressure of growth indoor gas is 100 torrs.Reacted 3 hours, and generated diameter and be about 10 nanometers, purity is up to more than 99%, the carbon nanotube of discrete ordered arrangement, and the length of carbon nanotube can reach 70 microns.
Embodiment three:
In the above embodiments 1 device, the preparation diameter is 20 nanometers, and length is 50 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%:
Condition is with embodiment one, just in step (1) 16.2 milliliters of 10 milliliters of 0.5 volumetric molar concentration iron nitrate solutions and 15.5 milliliters of tetraethoxys (analytical pure) and ethanol (analytical pure) mixed in 8: 1: 4 in molar ratio.After passing through the process identical with embodiment one again, can prepare diameter is 20 nanometers, and length is 50 microns, and purity reaches more than 99%, the carbon nanotube of ordered arrangement.
Embodiment four:
In the above embodiments 1 device, the preparation diameter is 20 nanometers, and length is 70 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%:
Condition is with embodiment two, just in step (1) 12.2 milliliters of 10 milliliters of 1 volumetric molar concentration iron nitrate solutions and 7.8 milliliters of tetraethoxys (analytical pure) and ethanol (analytical pure) mixed in 16: 1: 6 in molar ratio.After through the process identical with embodiment two, can prepare diameter is 20 nanometers, and length is 70 microns, and purity reaches more than 99%, the carbon nanotube of ordered arrangement.
Embodiment five:
In the above embodiments 1 device, the preparation diameter is 20 nanometers on the mesoporous silica film-substrate, and length is 50 microns, and purity reaches more than 99%, the carbon nanotube of ordered arrangement:
1。Prepare iron nitrate or iron(ic) chloride colloidal sol earlier:
Iron nitrate or ferric chloride Solution are slowly splashed in 80 ℃ of distilled water, be mixed with 1 mole iron nitrate or iron(ic) chloride colloidal sol.
2。The preparation aperture is the silica membrane substrate of 20 nanometers:
(1). 9.3 milliliters of 10 milliliters of the above-mentioned 1 volumetric molar concentration iron nitrate for preparing or iron(ic) chloride colloidal sols and 8.9 milliliters of tetraethoxys (analytical pure) and ethanol (analytical pure) were mixed in 14: 1: 4 in molar ratio, fully stir about half an hour.Then, slowly add about 0.2 milliliter hydrofluoric acid (analytical pure), further stirred 15 minutes, form silicon dioxide gel.
(2). cleaned quartz plate or tinsel (iron, cobalt, nickel, copper etc.) are fixed on and get rid of on the film machine, the silicon dioxide gel for preparing in (1) is dropped on quartz plate or the tinsel, on quartz plate or tinsel, be perfunctory to a layer thickness by getting rid of the rotation of film machine and be about several silica dioxide gel films to tens microns.The silica dioxide gel film is following dry 5 days 25 ℃ of constant temperature.
(3). it is indoor that dried silica dioxide gel film is placed on foregoing carbon nano tube growth, under 450 ℃ of temperature, is evacuated to 10
-2Under the torr, calcined 10 hours.
(4). it is that 550 ℃ of carbon nano tube growths are indoor that the silica dioxide gel film after will calcining is put into temperature.Feed the mixed gas of hydrogen and nitrogen, make ferric oxide particles reduction the becoming fe particle in the silica dioxide gel film.The volume ratio of hydrogen and nitrogen is 1: 10, and flow velocity is 110 ml/min, and the pressure of carbon nano tube growth indoor gas is 180 torrs, and the recovery time is 5 hours.Obtain containing the silica membrane substrate of micropore, the aperture of micropore is 20 nanometers, contains the iron catalyst particle at micropore.
On above-mentioned mesoporous silica film-substrate the growth ordered arrangement carbon nanotube:
The mesoporous silica film-substrate for preparing is put into sample box, utilizing specimen holder that it is delivered to temperature is that 700 ℃ carbon nano tube growth is indoor, feed the mixed gas of acetylene and nitrogen, the volume ratio of acetylene and nitrogen is 1: 10, flow velocity is 110 ml/min, and the pressure of growth indoor gas is 180 torrs.Reacted 2 hours, and generated diameter and be about 20 nanometers, purity is up to more than 99%, the carbon nanotube of discrete ordered arrangement.The length of carbon nanotube can reach 50 microns.
Embodiment six:
Press the preparation method of embodiment 1 fully, just the ironic oxalate solution with same concentrations replaces iron nitrate solution.Making diameter is 25 nanometers, and length is 50 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
Embodiment seven:
Press the preparation method of embodiment 1 fully, just the cobalt nitrate solution with same concentrations replaces iron nitrate solution.Making diameter is 30 nanometers, and length is 60 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
Embodiment eight:
Press the preparation method of embodiment 2 fully, just the cobaltous chlorate solution with same concentrations replaces iron nitrate solution.Making diameter is 30 nanometers, and length is 80 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
Embodiment nine:
Press the preparation method of embodiment five fully, just with Xiao Suangu or cobaltous chlorate or original iron nitrate or the iron(ic) chloride of cobalt oxalate replacement.Making diameter is 25 nanometers, and length is 50 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
Embodiment ten:
Press the preparation method of embodiment 3 fully, just the cobalt oxalate solution with same concentrations replaces iron nitrate solution.Making diameter is 25 nanometers, and length is 60 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
Embodiment 11:
Press the preparation method of embodiment 1 fully, just the nickel nitrate solution with same concentrations replaces iron nitrate solution.Making diameter is 30 nanometers, and length is 60 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
Embodiment 12:
Press the preparation method of embodiment 2 fully, just the chloric acid nickel solution with same concentrations replaces iron nitrate solution.Making diameter is 15 nanometers, and length is 70 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
Embodiment 13:
Press the preparation method of embodiment 3 fully, just the nickelous oxalate solution with same concentrations replaces iron nitrate solution.Making diameter is 25 nanometers, and length is 50 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
Embodiment 14:
Press the preparation method of embodiment five fully, just with nickelous nitrate or nickelous chloride or original iron nitrate or the iron(ic) chloride of nickelous oxalate replacement.Making diameter is 30 nanometers, and length is 60 microns, and purity reaches the carbon nanotube of the ordered arrangement more than 99%.
Claims (6)
1. a method for preparing the carbon nanotube of ordered arrangement is characterized in that: comprise the following steps:
(1). the oxymuriate of transition metal or nitrate or oxalate are dissolved in the distilled water, are mixed with concentration and are 0.1～2 mole solution.
(2). the oxymuriate of transition metal or nitrate or oxalate solution are splashed in 50～80 ℃ of distilled water, be mixed with concentration and be 0.1～2 mole colloidal sol.Wherein, used oxymuriate or nitrate or oxalate solution several saline solutions for being mentioned in (1).
(3). above-mentioned solution (1) that will prepare or colloidal sol (2) and tetraethoxy and ethanol is (8～16) in molar ratio: 1: mix (4～6), fully stirs half an hour.In per 30 milliliters of mixed solutions, add 0.1～0.3 milliliter of hydrofluoric acid or hydrochloric acid, continue to stir 15-30 minute.Form silicon dioxide gel.
(4). silicon dioxide gel is made silicon dioxide substrates with following way with uniform distribution orientation hole:
A. under constant temperature 20-30 ℃ condition, make the silicon dioxide gel of making in the above-mentioned steps solidify the formation silica dioxide gel; Silica dioxide gel is placed in the thermostatic electric heater under 40-70 ℃ of temperature dry 7-10 days; Then, the carbon nano tube growth that silica dioxide gel is placed on this isolated plant is indoor, in 350-500 ℃ of temperature and 10
-1-10
-2Under the torr vacuum condition, calcined 10-15 hour; It is indoor under 450-550 ℃ of temperature that silica dioxide gel after will calcining again is placed on carbon nano tube growth; feed mobile hydrogen and carry out reduction reaction, make that the interior transition metal oxide nano particle of micropore is reduced to the elemental metals nano particle in the silica dioxide gel with the nitrogen mixture body.Hydrogen and nitrogen 0.5/10～2/10 mix by volume, and the flow velocity of mixed gas is 80～150 ml/min, and pressure is 100～300 torrs, and the recovery time is 5-10 hour.
B. another method for preparing silicon dioxide substrates is: perhaps will handle clean quartz plate or tinsel and be fixed on and get rid of on the film machine, and the silicon dioxide gel for preparing in above-mentioned (3) be dropped in get rid of into the layer of silicon dioxide gel-film on quartz plate or the tinsel; The silica dioxide gel film under 20～30 ℃ of temperature of constant temperature, dry 3～5 days; The carbon nano tube growth that dried silica dioxide gel film is placed on this isolated plant is indoor, in 450 ℃ of constant temperature, is evacuated to 10
-2Torr was calcined 10 hours; Then, it is indoor that the silica dioxide gel film after the calcining is put into 550 ℃ carbon nano tube growth, feeds the mixed gas of hydrogen and nitrogen, makes that the transition metal oxide nano particle is reduced into the elemental metals nano particle in the silica dioxide gel film.Hydrogen mixed with nitrogen in 1: 10 by volume, and flow velocity is 110 ml/min, and the pressure of carbon nano tube growth indoor gas is 180 torrs, and the reduction reaction time is 5 hours.
(5) the above-mentioned silicon dioxide substrates with uniform distribution orientation hole that has prepared is put into the sample box of apparatus of the present invention, utilizing specimen holder that substrate is delivered to temperature is in 600～700 ℃ the carbon nano tube growth chamber.After treating that substrate reaches constant temperature, the mixed gas that feeds acetylene and nitrogen is to Reaktionsofen.Acetylene is (1～2) with the mixed volume ratio of nitrogen: 10, and the flow velocity of gas is 80～150 ml/min, and the indoor gaseous tension of carbon nano tube growth is 100～300 torrs, and insulation is at 600～700 ℃, and the reaction times is 1-5 hour.
2. press the method for the carbon nanotube of claim 1 described preparation ordered arrangement, it is characterized in that: described transition metal oxymuriate comprises: iron(ic) chloride, cobalt chloride, nickelous chloride etc.
3. press the method for the carbon nanotube of claim 1 described preparation ordered arrangement, it is characterized in that: described transition metal nitrate comprises: iron nitrate, Xiao Suangu, nickelous nitrate etc.
4. press the method for the carbon nanotube of claim 1 described preparation ordered arrangement, it is characterized in that: described transition metal oxalate comprises: ironic oxalate, cobalt oxalate, nickelous oxalate etc.
5. a device that is exclusively used in the carbon nano-tube material of preparation claim 1 described ordered arrangement is characterized in that: be made up of body of heater, gas distributing system, vacuum system three parts.Wherein the inside of body of heater is a carbon nano tube growth chamber (3) of being made by stainless-steel pipe or silica tube, and by putting in heating unit (4), temperature controller (7) is connected with heating unit (4) growth room (3).Thermopair (13) is fixed in the specimen holder (9).Wherein gas distributing system is connected with mass-flow gas meter (2) by gas circuit (1), and mass-flow gas meter (2) is connected an end of carbon nano tube growth chamber (3).Wherein vacuum system is connected on pressure regulator valve (10) and the butterfly valve (11) by vacuum unit (12), and pressure regulator valve (10) and butterfly valve (11) are installed in the other end of carbon nano tube growth chamber (3) side by side.
6. one kind prepares the carbon nanotube of ordered arrangement by claim 1 described method, and it is characterized in that: length of carbon nanotube is 20～100 microns, and diameter phi 7～30 nanometers, purity have metallicity, semi-metal, nonmetal character up to 99%.
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