CN1778672A - Surface chemical modification for carbon nanometer tubes - Google Patents
Surface chemical modification for carbon nanometer tubes Download PDFInfo
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- CN1778672A CN1778672A CN 200510030120 CN200510030120A CN1778672A CN 1778672 A CN1778672 A CN 1778672A CN 200510030120 CN200510030120 CN 200510030120 CN 200510030120 A CN200510030120 A CN 200510030120A CN 1778672 A CN1778672 A CN 1778672A
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- benzophenone
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Abstract
A surface chemical modification for carbon nanometer tube is carried out by reacting metal with benzophenone in dried organic solvent to generate carbon free radical or carbon anion reactive species, inter-acting the species with carbon nanometer tube for some time, stopping reaction by alcohol, filtering, washing by solvent, drying and obtaining functional carbon nanometer. The metal are one or several of potassium, sodium and lithium. Benzohydrol salt in covalent linkage on pipe wall of the obtained functional carbon nanometer tube is linked to carbon nanometer tube, disperses in water or mixed liquid with water and organic solvent which can control surface charge amount by regulating water pH value. It is simple and has gentle reaction condition.
Description
Technical field
What the present invention relates to is the method in a kind of Micrometer-Nanometer Processing Technology field, particularly a kind of method of carbon nano tube surface chemically modified.
Background technology
Carbon nanotube is because its unique physics and chemical property since finding, have just caused the great interest of people.Interact in order to overcome Van der Waals strong between the carbon nanotube, improve carbon nanotube dispersing property in solvent, perhaps strengthen the interaction between it and the other materials, it is very important means that carbon nano tube surface is modified.By finishing, carbon nanotube can be dissolved in the water, carbon nanotube is widely used in fields such as biomedicine, Materials science.
Warp mainly contains covalent modification method and non-covalent modification method at present to the preparation method of the water miscible carbon nanotube of prior art.The covalent modification method mainly is to use earlier the strong acid oxidation, then with hydrophilic compound reaction.For example, Chinese patent publication number: CN1436721, open day: on August 20th, 2003, this patent is exactly to use earlier the strong acid oxidation, then with acyl chloride reaction, and further with the primary amine or the reaction of secondary amine hydrophilic compounds of polyglycol ether, obtain water-soluble carbon nanometer tube.But the problem of this method maximum is the structure of strong acid oxidation destroying carbon nanometer tube.The non-covalent modification method is meant that a small molecules tensio-active agent or hydrophilic high mol are adsorbed on carbon nano tube surface, can be dispersed in the water carbon nanotube.Kim, people such as O.K " Journal of theAmerican Chemical Society " (JACS, 2003,125, the method that a kind of polysaccharide non-covalent modification legal system is equipped with water-soluble carbon nanometer tube is disclosed on 4426-4427).This method generally needs relatively large modifier, makes further to handle difficulty.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, the way that provides a kind of carbon nano tube surface to modify, make it utilize sodium Metal 99.5, potassium, lithium and benzophenone reaction, generate benzhydrol salt free radical and benzhydrol salt carbanion spike, these spikes can react with carbon nanotube, obtain functionalized carbon nanotube, method is simple, practical.
The present invention is achieved by the following technical solutions, the present invention reacts in the exsiccant organic solvent by metal and benzophenone, generate carbon radicals or carbanion spike, these spikes and carbon nanotube are used pure termination reaction after interacting, and product filters, use solvent wash, drying obtains functionalized carbon nanotube, and described metal is one or several in potassium, sodium, the lithium.
Described benzophenone has following structure:
Wherein
Be phenyl ring; C=O is a carbonyl.
Described metal, the carbon radicals that generates with the benzophenone interaction is a benzhydrol salt free radical; The carbanion that metal and benzophenone interaction generate is a benzhydrol salt carbanion.Benzhydrol salt free radical has following structure:
Wherein
Be phenyl ring; M is sodium, potassium, lithium ion.
Benzhydrol salt carbanion has following structure:
Wherein
Be phenyl ring; M is sodium, potassium, lithium ion.
Described carbon nanotube is single wall or multi-walled carbon nano-tubes, and they are conductor or semi-conductor.
Described metal and benzophenone, can interact earlier generates spike and mixes with carbon nanotube, also can metal, benzophenone, carbon nanotube three mix simultaneously.
Among the present invention, metal and benzophenone interact when generating carbon radicals or carbanion spike, if the mol ratio of metal and benzophenone equals 1 or less than 1, spike is a benzhydrol salt free radical; If the mol ratio of metal and benzophenone is 2 or greater than 2, spike is a benzhydrol salt carbanion; If their mol ratio is between 1 and 2 the time, the spike that obtains is the mixture of benzhydrol salt free radical and benzhydrol salt carbanion.
Described carbon radicals or carbanion spike and carbon nanotube interact, and the time is 10 minutes to 120 hours, and temperature is in-40 ℃ to 100 ℃ scopes.
Described metal and benzophenone, its mol ratio is between 1: 10 to 10: 1.
Described organic solvent is tetrahydrofuran (THF), toluene, perhaps their mixture.
The alcohol that described termination reaction is used is methyl alcohol, ethanol, Virahol, propyl carbinol, perhaps the mixture between them.
The described solvent wash of using is meant: with tetrahydrofuran (THF) washing 2-4 time.
Described functionalized carbon nanotube, its functional group are benzhydrol salt.Benzhydrol salt comprises benzhydrol sodium salt, benzhydrol sylvite, benzhydrol lithium salts.
Benzhydrol salt is with covalent linkage and carbon nanotube bonding on the tube wall of the functionalized carbon nanotube that the present invention obtains.This functionalized carbon nanotube can be dispersed in the water, also can be dispersed in the mixed solution of water and organic solvent.Functionalized carbon nanotube is dispersed in and has the intensive negative charge in the water, and surface charge that the pH value of water can controlling carbon nanotube what are regulated.
Chemically modified way of the present invention is simple and practical, and spike is finished synchronously to the introducing of the functional group of the bonding of carbon nanotube and ionic, has simplified testing sequence greatly.All reaction conditionss all can carry out under the condition of gentleness, do not need complicated testing apparatus.
The present invention obtain carbon nanotube can be dissolved in the water, can in water, interact easily with biomolecules or cell, this all is very favorable as biosensor, tissue engineering material etc. for example for the application of carbon nanotube on biomedicine; The carbon nanotube that the present invention obtains can also make things convenient for to mix with other water miscible polymers and is used for preparing nano composite material; In the aqueous solution, handle carbon nanotube, with respect to in the organic solvent, environment not being polluted.
Embodiment
Provide following examples in conjunction with content of the present invention:
Embodiment 1.
Get sodium Metal 99.5 2.3g, join in the 100ml toluene, use forced oscillation behind the ebuillition of heated, make reguline metal sodium become the small-particle of diameter less than 1mm, cool to room temperature adds exsiccant tetrahydrofuran (THF) 50ml, add benzophenone 1.82g, add multi-walled carbon nano-tubes 0.1g.Stirred 10 minutes down at 100 ℃.Take out unreacted metal sodium, add methyl alcohol 20ml termination reaction, filtration, wash 3 times, each 50ml, the carbon nanotube of collecting functionization, vacuum-drying with tetrahydrofuran (THF).Get in the water that functionalized carbon nanotube 0.1g joins 200ml, ultrasonic 2 hours, filter, take by weighing precipitation weight, the solubleness of the carbon nanotube of computing functionization in water is 0.01% (g/ml).Functionalized carbon nanotube is stable in water, solution not precipitation generation in static 10 days.Functionalized carbon nanotube is not water insoluble, in water ultrasonic after, static 1 day precipitation just all.Functionalization is dissolved in the water, regulates pH value 2.4,3.0,6.5,8.6, and corresponding Zeta potential is respectively :-7.7mV ,-24.6mV ,-38.7mV ,-39.7mV.
Embodiment 2.
Get potassium metal 0.23g, join (V/V=3: 1) in 100ml toluene/tetrahydrofuran (THF) mixed solution, add benzophenone 18.2g, add multi-walled carbon nano-tubes 0.1g, stir 120h down at 25 ℃, add butanols 20m termination reaction, filtration, wash 4 times, each 50ml with tetrahydrofuran (THF), the carbon nanotube of collecting functionization, vacuum-drying.Get in the water that functionalized carbon nanotube 0.1g joins 200ml, ultrasonic 2 hours, filter, take by weighing precipitation weight, the solubleness of the carbon nanotube of computing functionization in water is 0.025% (g/ml).Functionalized carbon nanotube is stable in water, solution not precipitation generation in static 50 days.
Embodiment 3.
Get potassium metal 1.9g, sodium 1.2g, with kerosene clean surface dirt settling, join in the 100ml toluene, use forced oscillation behind the ebuillition of heated, make reguline metal sodium become the small-particle of diameter less than 1mm, cool to room temperature adds 100ml exsiccant tetrahydrofuran (THF), adds benzophenone 9.1g again, add Single Walled Carbon Nanotube 0.05g, ultrasonic 1h stirred 120 hours down at 80 ℃ then earlier, used ethanol 20ml termination reaction again, filter, wash 4 times with tetrahydrofuran (THF), each 30ml, the carbon nanotube of collecting functionization, vacuum-drying gets final product.Get in the water that functionalized carbon nanotube 0.05g joins 200ml, ultrasonic 2 hours, filter, take by weighing precipitation weight, the solubleness of the carbon nanotube of computing functionization in water is 0.02% (g/ml), at water/ethanol (V/V=3: the solubleness 1) not 0.014%.Functionalized carbon nanotube is stable in water, solution not precipitation generation in static 20 days.
Embodiment 4.
Get metallic lithium 0.7g, join (V/V=1: 1) in 100ml exsiccant tetrahydrofuran (THF)/toluene mixture liquid, add benzophenone 9.1g and Single Walled Carbon Nanotube 0.02g again, stirred 60 hours down at-40 ℃, use the ethanol termination reaction, filter, wash 4 times, each 30ml with the exsiccant tetrahydrofuran (THF), reclaim the Single Walled Carbon Nanotube of modifying, vacuum-drying.Get in the water that functionalized carbon nanotube 0.02g joins 100ml, ultrasonic 2 hours, filter, take by weighing precipitation weight, the solubleness of the carbon nanotube of computing functionization in water is 0.013% (g/ml).Functionalized carbon nanotube is stable in water, solution not precipitation generation in static 16 days.
Claims (10)
1, a kind of method of carbon nano tube surface chemically modified, it is characterized in that, metal and benzophenone are reacted in the exsiccant organic solvent, generate carbon radicals or carbanion spike, after these spikes and carbon nanotube interact, use pure termination reaction, product filters, and uses solvent wash, drying, obtain functionalized carbon nanotube, described metal is one or several in potassium, sodium, the lithium.
2, the method for carbon nano tube surface chemically modified according to claim 1 is characterized in that, described benzophenone has following structure:
Wherein
Be phenyl ring; C=O is a carbonyl.
3, the method for carbon nano tube surface chemically modified according to claim 1 is characterized in that, described metal and benzophenone, and the carbon radicals that generates that interacts is a benzhydrol salt free radical; The carbanion that metal and benzophenone interaction generate is a benzhydrol salt carbanion, and wherein, benzhydrol salt free radical has following structure:
Wherein
Be phenyl ring; M is sodium, potassium, lithium ion;
Benzhydrol salt carbanion has following structure:
Wherein
Be phenyl ring; M is sodium, potassium, lithium ion.
4, the method for carbon nano tube surface chemically modified according to claim 3, it is characterized in that, described carbon radicals or carbanion spike and carbon nanotube interact, time is 10 minutes to 120 hours, temperature is in-40 ℃ to 100 ℃ scopes, described carbon nanotube is single wall or multi-walled carbon nano-tubes, and they are conductor or semi-conductor.
5, the method for carbon nano tube surface chemically modified according to claim 1 is characterized in that, described metal and benzophenone, and the generation spike that interacts earlier mixes with carbon nanotube again, and perhaps metal, benzophenone, carbon nanotube three mix simultaneously; Metal and benzophenone mol ratio are between 1: 10 to 10: 1.
6, according to the method for claim 1 or 5 described carbon nano tube surface chemically modifieds, it is characterized in that, metal and benzophenone interact when generating carbon radicals or carbanion spike, if the mol ratio of metal and benzophenone equals 1 or less than 1, spike is a benzhydrol salt free radical; If the mol ratio of metal and benzophenone is 2 or greater than 2, spike is a benzhydrol salt carbanion; If their mol ratio is between 1 and 2 the time, the spike that obtains is the mixture of benzhydrol salt free radical and benzhydrol salt carbanion.
7, the method for carbon nano tube surface chemically modified according to claim 1 is characterized in that, described organic solvent is tetrahydrofuran (THF), toluene, perhaps their mixture.
8, the method for carbon nano tube surface chemically modified according to claim 1 is characterized in that, the alcohol that described termination reaction is used is methyl alcohol, ethanol, Virahol, propyl carbinol, perhaps the mixture between them.
9, the method for carbon nano tube surface chemically modified according to claim 1 is characterized in that, the described solvent wash of using is meant: with tetrahydrofuran (THF) washing 2-4 time.
The method of 10 carbon nano tube surface chemically modifieds according to claim 1 is characterized in that, described functionalized carbon nanotube, and its functional group is a benzhydrol salt, benzhydrol salt comprises benzhydrol sodium salt, benzhydrol sylvite, benzhydrol lithium salts.
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| CNB2005100301207A CN100391832C (en) | 2005-09-29 | 2005-09-29 | Surface chemical modification for carbon nanometer tubes |
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| CN100391832C CN100391832C (en) | 2008-06-04 |
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| US6426134B1 (en) * | 1998-06-30 | 2002-07-30 | E. I. Du Pont De Nemours And Company | Single-wall carbon nanotube-polymer composites |
| CN1287007C (en) * | 2002-11-01 | 2006-11-29 | 中国科学院理化技术研究所 | Preparation method of carbon nano tube/silver composite functional material |
| KR100801820B1 (en) * | 2002-11-19 | 2008-02-11 | 삼성전자주식회사 | Method for forming a patterned monolayer of surface-modified carbon nanotubes |
| KR100947702B1 (en) * | 2003-02-26 | 2010-03-16 | 삼성전자주식회사 | Method for forming a patterned film and a polymeric complex of surface-modified carbon nanotubes having polymerizable moiety |
| JP2005101363A (en) * | 2003-09-25 | 2005-04-14 | Sanyo Electric Co Ltd | Carbon nanotube structure and manufacturing method of transistor |
| CN1284727C (en) * | 2003-11-07 | 2006-11-15 | 中国科学院化学研究所 | Method for carbon nanometer tube with chemical decoration |
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