JP2010180263A - Carbon nanotube ink composition and method for producing carbon nanotube film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carbon nanotube ink composition that disperses carbon nanotube easily, has excellent storage stability of the dispersed carbon nanotube, and moreover, excels in conformity to a printer (wettability to the printer, filling property in the printer, and sprayability at a constant discharge from the printer). <P>SOLUTION: This carbon nanotube ink composition includes the carbon nanotube, a solvent, and glycol ether. The glycol ether and solvent disperse the carbon nanotube easily, and store the dispersed carbon nanotube stably. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a carbon nanotube dispersion, and more particularly, to a carbon nanotube ink composition and a method of manufacturing a carbon nanotube film.

  The carbon nanotube has a structure in which a graphene sheet is rolled into a cylindrical shape, and generally has a straw-like or straw-like structure. Carbon nanotubes include single-wall carbon nanotubes (SWCNT) consisting of a single tube, double-wall carbon nanotubes (DWCNT) in which two tubes with different diameters are stacked, and multi-wall carbon in which multiple tubes with different diameters are stacked. It is classified as a nanotube (MWCNT), and applied research utilizing the characteristics of each structure is underway. For example, SWCNT has a structure having semiconductor characteristics depending on how the graphene sheet is wound, and high mobility is expected. Therefore, SWCNT is expected to be applied to a thin film transistor (TFT) and is actively researched. Non-Patent Document 1 to Non-Patent Document 4 disclose that TFTs using carbon nanotubes have performance equivalent to or higher than silicon. In addition, since DWCNT and MWCNT exhibit high electrical conductivity, they are expected to be applied to electrode materials, wiring materials, antistatic films, and transparent electrodes, and are being studied.

  A TFT using carbon nanotubes as a channel semiconductor material is manufactured using one, several, or many carbon nanotubes. Since TFTs using a small number of carbon nanotubes generally have a carbon nanotube length of about 1 μm or less, fine processing is required. That is, the so-called channel length between the source electrode and the drain electrode must be manufactured on a submicron scale. On the other hand, a TFT using a large number of carbon nanotubes can be easily manufactured because the channel length can be increased because a network of carbon nanotubes is used as a channel. Non-Patent Document 5 discloses a technique for manufacturing a TFT using a large number of carbon nanotubes.

  In order to form a thin film using a large number of carbon nanotubes, a method using a solution or dispersion of carbon nanotubes can be mentioned. A method of forming a carbon nanotube thin film from a solution or a dispersion is disclosed in Non-Patent Document 6 to Non-Patent Document 9.

  When carbon nanotubes are used as the material for the semiconductor layer, the heating temperature necessary for forming the semiconductor layer can be suppressed by forming a thin film of carbon nanotubes by a method using a solution or dispersion. Accordingly, the semiconductor layer can be formed not only on a hard material such as an element / device, a product substrate, and glass but also on a thermoplastic material such as a resin or plastic. That is, it becomes possible to give flexibility to the element / device and the entire product. Furthermore, the method of forming a thin film of carbon nanotubes from a solution or a dispersion has a possibility of realizing cost reduction of elements, devices, and products because a coating (printing) process is adopted.

  Patent Document 1 discloses a method for easily forming a carbon nanotube pattern having high mechanical strength, high adhesion to a substrate, and conductivity between the surface and the substrate. This forming method includes a step of printing a desired pattern on the substrate surface using a dispersion of carbon nanotubes, evaporating the dispersion medium to form a pattern layer, and a step of fixing the pattern layer to the substrate surface. It is characterized by. Such a formation method is capable of fixing a network structure in which carbon nanotubes are densely stacked, so that an electrically good carbon nanotube pattern can be formed. Furthermore, the formed carbon nanotube pattern has mechanical strength, high adhesion to the substrate, and conductivity between the pattern surface and the substrate.

JP 2006-69848 A

Sander J.M. Tans et al., NATURE, May 7, 1998, No. 393, p. 49-52 R. Martel et al., APPLIED PHYSICS LETTERS, October 26, 1998, 73, 17, p. 2447-2449 S. J. et al. Wind et al., APPLIED PHYSICS LETTERS, May 20, 2002, 80, 20, p. 3817-3819 Kai Xiao et al., APPLIED PHYSICS LETTERS, July 7, 2003, Vol. 83, No. 1, p. 150-152 S. Kumar et al., APPLIED PHYSICS LETTERS, 2006, Vol. 89, p. 143501 (1) -143501 (3) Neerja Saran et al., JOURNAL OF AMERICA CHEMICAL SOCIETY, 2004, vol. 126, p. 4462-4463 Zhuangchun Wu et al., SCIENCE, August 27, 2004, No. 305, p. 1273-1276 Mei Zhang et al., SCIENCE, August 19, 2005, No. 309, p. 1215-1219 Yangxin Zhou et al., APPLIED PHYSICS LETTERS, 2006, Vol. 88, p. 123109 (1) -123109 (3)

  A carbon nanotube ink composition in which carbon nanotubes are dispersed in an organic solvent or water is effective for forming a carbon nanotube film. However, the production of the carbon nanotube ink composition is very difficult due to the difficulty of dispersing the carbon nanotubes and the difficulty of stably storing the dispersed carbon nanotubes. Until now, ionic surfactants, compounds having special structures, and the like have been used as dispersants to produce carbon nanotube ink compositions. These dispersants have a certain effect on the storage stability of the carbon nanotube ink composition. However, such a carbon nanotube ink composition has poor wettability with respect to a printing apparatus such as an ink jet printer or a dispenser, and it is difficult to form a carbon nanotube film by printing. In particular, in an inkjet printer, it is difficult to spray with a constant discharge amount due to poor wettability in the head.

  The object of the present invention is to easily disperse the carbon nanotubes, and to have excellent storage stability of the dispersed carbon nanotubes. Furthermore, the compatibility with the printing apparatus (wetting with respect to the printing apparatus, filling property in the printing apparatus, from the printing apparatus) It is an object to provide a carbon nanotube ink composition excellent in sprayability at a constant discharge amount.

  The carbon nanotube ink composition of the present invention comprises carbon nanotubes, a solvent, and glycol ethers. In such a carbon nanotube ink composition, the glycol ethers and the solvent can easily disperse the carbon nanotubes, and the dispersed carbon nanotubes can be stably stored.

  The carbon nanotube ink composition of the present invention can easily disperse carbon nanotubes and can stably store the dispersed carbon nanotubes. Furthermore, since the carbon nanotube ink composition of the present invention is excellent in wettability with respect to a printing apparatus, it can be easily filled in the printing apparatus, and in particular, can be sprayed at a constant discharge amount from an inkjet printer.

FIG. 1 is a photograph in which the carbon nanotube ink composition 1 of Example 1 was filled in the head 100 of an inkjet printer manufactured by Konica Minolta, and the filling state and the spraying state were observed. FIG. 2 is a photograph in which the carbon nanotube ink composition 21 manufactured for comparison is filled in the head 100 of the inkjet printer, and the filling state and the spraying state are observed in the same manner as in FIG.

  Hereinafter, a carbon nanotube ink composition and a carbon nanotube film manufacturing method according to embodiments of the present invention will be described.

  The carbon nanotube ink composition of the present invention comprises carbon nanotubes, a solvent, and glycol ethers.

  The carbon nanotube may be any of SWCNT, DWCNT, and MWCNT, and is not limited to a shape. The carbon nanotube is preferably SWCNT when the carbon nanotube film functions as a semiconductor material, and SWCNT, DWCNT, and MWCNT when functioning as a conductive material. There are various methods for producing carbon nanotubes, such as CVD and laser ablation, but carbon nanotubes produced by any production method can be used.

  The solvent is water or an organic solvent. Organic solvents include aliphatic hydrocarbons such as decane and undecane, aromatic hydrocarbons such as toluene and xylene, ketones such as methyl ethyl ketone and cyclohexanone, ethers such as diethyl ether and ethyl methyl ether, ethyl acetate, and methyl propionate. Preferred examples include carboxylic acid alkyl esters such as dichloroethane, N, N-dimethylformamide and the like. These can be used alone or in combination of two or more.

  Glycol ethers are compounds obtained by condensation reaction of glycol having two hydroxyl groups and alcohol. Glycol ethers include an alkylene structure of a glycol main chain and an alkyl structure of a terminal alcohol, which impart parent carbon nanotube properties. On the other hand, intramolecular ether bonds impart new solvent properties. In the case of having a hydroxyl group at the terminal, since the dipole moment is large, hydrophilicity is particularly imparted as a solvophilic property. That is, glycol ethers contain a parent carbon nanotube part and a parent solvent part in the molecule, and can easily disperse the carbon nanotube and stably store the dispersed carbon nanotube in the solvent. In addition, glycol ethers have an effect as a wetting agent, and can improve the familiarity (wetting property) of the carbon nanotube ink composition to a printing apparatus such as an ink jet printer or a dispenser. The carbon nanotube ink composition of the present invention is particularly effective for an ink jet printer, can be easily filled into the head of the ink jet printer, and can be sprayed from the head at a constant discharge amount.

  Details of the glycol ethers will be described. The glycol main chain of the glycol ether is preferably a monoglycol ether, a diglycol ether, or a triglycol ether having a polymerization degree of 1 to 3 using ethylene glycol or propylene glycol. Specifically, they are a monoethylene glycol ether compound, a diethylene glycol ether compound, a triethylene glycol ether compound, a monopropylene glycol ether compound, a dipropylene glycol ether compound, and a tripropylene glycol ether compound. These can be used alone or in combination of two or more. In these cases, the glycol main chain of glycol ethers gives the carbon nanotube ink composition easy dispersibility of carbon nanotubes, good storage stability of dispersed carbon nanotubes, and good compatibility with printing devices. I can do it.

  The terminal alkyl group of glycol ethers is preferably an alkyl group having 1 to 4 carbon atoms. That is, the alkyl group is preferably a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, or an isobutyl group. The number of terminal alkyl groups may be one or two, that is, either a monoether compound or a diether compound. A monoether compound is effective in an aqueous solvent because a hydroxyl group remains at the terminal. On the other hand, diether compounds are effective for organic solvents. Specifically, glycol ether monomethyl ether compound, glycol ether dimethyl ether compound, glycol ether monoethyl ether compound, glycol ether diethyl ether compound, glycol ether monopropyl ether compound, glycol ether dipropyl ether compound, glycol ether monoisopropyl ether compound, glycol An ether diisopropyl ether compound, a glycol ether monobutyl ether compound, a glycol ether dibutyl ether compound, a glycol ether monoisobutyl ether compound, and a glycol ether diisobutyl ether compound. These can be used alone or in combination of two or more.

  Dispersibility of carbon nanotubes can be maintained when the molecular weight of glycol ethers is increased by increasing the length of the alkylene group in the glycol main chain, increasing the polymerization degree of glycol, or increasing the molecular weight of the terminal alkyl group. However, the wettability to the printing apparatus is reduced. Therefore, these glycol ethers having a large molecular weight cannot be compatible with the printing apparatus.

  A generally known chemical reaction can be applied to the method for producing glycol ethers. Glycol ethers are produced by mixing a glycol having two hydroxyl groups or a commercially available glycol oligomer with a primary alcohol such as methanol or ethanol, and performing an acid-catalyzed condensation reaction. In this case, glycol ethers are a product obtained by reacting both hydroxyl groups of glycol (glycol ether dialkyl ether) and a product obtained by reacting only one hydroxyl group (glycol ether monoalkyl ether) by controlling the reaction time and temperature. ) Is selectively generated. The produced glycol ethers are isolated and purified by a generally well-known distillation (fractional distillation) operation.

  The content of each component in the carbon nanotube ink composition of the present invention will be described. The carbon nanotubes are contained within a range in which the carbon nanotube ink composition of the present invention has printable properties. When the carbon nanotube ink composition is used in an ink jet printer, the mass percent concentration is preferably up to about 1%. When the content of carbon nanotubes exceeds 10% in terms of mass percent concentration, the carbon nanotube ink composition itself has increased viscosity and becomes a paste.

  Glycol ethers are contained within a range in which the carbon nanotube ink composition of the present invention has printable properties. Preferably, the content of glycol ethers is about 50% of the amount of carbon nanotubes by weight and about 10 times that of carbon nanotubes. When the ratio with respect to the carbon nanotube is extremely small, the dispersibility of the carbon nanotube, the storage stability of the dispersed carbon nanotube, and the suitability of the carbon nanotube ink composition for the printing apparatus are lowered. For example, when the content of glycol ethers is 1% or less of the carbon nanotubes by weight, the carbon nanotube ink composition is deteriorated in the dispersibility and storage stability of the carbon nanotubes. Occur.

  The carbon nanotube ink composition of the present invention can further comprise a polyethylene glycol alkyl ether compound containing an alkyl group having 10 or more carbon atoms as a substituent in addition to the glycol ethers described above. The polyethylene glycol alkyl ether compound may have one or two terminal alkyl groups. The polyethylene glycol alkyl ether compound containing an alkyl group having 10 or more carbon atoms can compensate for dispersibility and stability after dispersion when the carbon nanotube ink composition has a high mass percentage concentration of carbon nanotubes. That is, the carbon nanotube ink composition containing the polyethylene glycol alkyl ether compound can easily disperse a high concentration of carbon nanotubes and can be stabilized in a solvent. Specifically, a carbon nanotube ink composition containing a polyethylene glycol alkyl ether compound having an alkyl group having 10 or more carbon atoms can be stably dispersed up to a mass percent concentration of carbon nanotubes of 10%. As the alkyl group having 10 or more carbon atoms, either a saturated alkyl group or an unsaturated alkyl group may be used, and furthermore, both a linear alkyl group and a branched alkyl group provide high dispersibility and stability after dispersion. be able to. A straight-chain saturated alkyl group having 18 to 20 carbon atoms is preferable because it has particularly high dispersion stability.

  The polyethylene glycol alkyl ether compound containing an alkyl group having 10 or more carbon atoms is added in such a content that the carbon nanotubes can be easily dispersed and the dispersed carbon nanotubes can be stably stored in the solvent. Preferably, the content of the polyethylene glycol alkyl ether compound is the same as the amount of carbon nanotubes by weight ratio. When the amount of the polyethylene glycol alkyl ether compound and the carbon nanotube is the same, the carbon nanotube ink composition can have high dispersibility and storage stability of the carbon nanotube.

  The carbon nanotube ink composition of the present invention, which contains a carbon nanotube, a solvent, and a glycol ether, is obtained by easily dispersing the carbon nanotube based on the solvent and the glycol ether. Can be stably stored in a solvent. Furthermore, in the carbon nanotube ink composition of the present invention, glycol ethers have improved wettability with respect to the printing apparatus, and the familiarity with the printing apparatus is improved. Therefore, the carbon nanotube ink composition of the present invention is excellent in compatibility with a printing apparatus (wetting with respect to the printing apparatus, filling property in the printing apparatus, sprayability of a certain discharge amount from the printing apparatus). When the printing apparatus is an ink jet printer, if the wettability is poor, the filling property into the head of the ink jet printer is deteriorated, and there is a problem that a constant discharge amount cannot be stably sprayed. However, since the carbon nanotube ink composition of the present invention can be easily filled into the head and can stably spray with a constant discharge amount, it is particularly excellent in adaptability to an ink jet printer.

  Next, a method for producing a carbon nanotube film using the carbon nanotube ink composition of the present invention will be described.

  The carbon nanotube ink composition is filled into the head of an inkjet printer. The carbon nanotube ink composition is sprayed from the head of the inkjet printer and applied onto the substrate. For the substrate, an insulator or a conductor is arbitrarily selected according to the semiconductivity or conductivity of the carbon nanotube film.

  In the carbon nanotube ink composition applied on the substrate, the solvent is volatilized to form a carbon nanotube film. Since the carbon nanotube ink composition applied on the substrate has small droplets, forced drying by heating or the like is not necessary. However, in the case of drying, a method of heating and drying at a temperature near the boiling point of the solvent is exemplified. The glycol ethers may be volatilized by drying or may remain in the carbon nanotube film.

  The carbon nanotube film manufactured by such a process can be used as an alternative to a semiconductor film such as polysilicon when the carbon nanotube is SWCNT. Further, when the carbon nanotube is SWCNT, DWCNT, or MWCNT, it can be used as a substitute for a conductive film such as metal. That is, a device having a semiconductor film and a conductive film can be manufactured using these carbon nanotube films. For example, in the case of a TFT, a carbon nanotube (SWCNT) film functions as a channel by being formed between an insulator and two metal terminals formed on the insulator. In the TFT, a carbon nanotube (SWCNT, DWNCT, MWCNT) film is formed on an insulator and functions as a substitute for a metal terminal.

  In addition, although the example using an inkjet printer demonstrated the manufacturing method of the carbon nanotube film | membrane using a carbon nanotube ink composition, it is not limited to an inkjet printer. It is also possible to manufacture a carbon nanotube film by filling the carbon nanotube ink composition into another printing apparatus such as a dispenser.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to a following example, unless the summary is exceeded.

Example 1
The carbon nanotube ink composition 1 is manufactured by the following procedure. 10 mg of SWCNT prepared by the Hipco method was weighed into a glass container, and 100 mg of diethylene glycol monobutyl ether was added. Next, 10 g of water was added to the glass container, and ultrasonic treatment was performed for 1 hour using an ultrasonic device. The carbon nanotube ink composition 1 immediately after the ultrasonic treatment showed a uniform black form, and no residue or precipitate was observed. In addition, when the carbon nanotube ink composition 1 was observed after 10 days and after 30 days, no residue and precipitate were observed as in the case immediately after the treatment.

  FIG. 1 is a photograph in which the carbon nanotube ink composition 1 of Example 1 was filled in the head 100 of an inkjet printer manufactured by Konica Minolta, and the filling state and the spraying state were observed. Referring to FIG. 1, a head 100 and four droplets 1a, 1b, 1c, and 1d are shown. The head 100 is filled with the carbon nanotube ink composition 1 and sprays the carbon nanotube ink composition 1 as fine droplets based on a portion of an inkjet printer (not shown). The head 100 includes a discharge portion 110a, a discharge portion 110b, a discharge portion 110c, and a discharge portion 110d at the distal end portion 110. The ejection unit 110a ejects the droplet 1a, and the ejection unit 110b ejects the droplet 1b. Similarly, the ejection unit 110c ejects a droplet 1c, and the ejection unit 110d ejects a droplet 1d. In the photograph of FIG. 1, since the holes of the respective discharge portions are not shown, the location at the tip portion 110 is indicated by an arrow. The droplet 1a, the droplet 1b, the droplet 1c, and the droplet 1d are the carbon nanotube ink composition 1 sprayed as fine particles. The droplet 1a, droplet 1b, droplet 1c, and droplet 1b shown in FIG. 1 are in a state of being discharged from the respective discharge units and falling downward.

  The four droplets 1a, 1b, 1c, and 1d are at substantially the same distance from the tip 110. Thus, when the carbon nanotube ink composition 1 of the present invention was filled in the head 100 of the ink jet printer, a stable spray state was obtained with a constant discharge amount.

  As a comparison with Example 1, the case where the carbon nanotube ink composition 21 was produced without using glycol ethers will be described. The carbon nanotube ink composition 21 was produced in the same manner as in Example 1 except that diethylene glycol monobutyl ether was not used. The produced carbon nanotube ink composition 21 is dispersed to some extent immediately after the ultrasonic treatment, and the residue is slight. However, when the carbon nanotube ink 21 was observed 10 days later, all the carbon nanotubes were precipitated.

  FIG. 2 is a photograph in which the carbon nanotube ink composition 21 manufactured for comparison is filled in the head 100 of the inkjet printer, and the filling state and the spraying state are observed in the same manner as in FIG. Referring to FIG. 2, a head 100, a droplet 21a, a droplet 21c, and a droplet 21d are shown. As in the first embodiment, the head 100 is filled with the carbon nanotube ink composition 21 and sprays the carbon nanotube ink composition 21 as fine droplets. The ejection unit 110a ejects the droplet 21a, and the ejection unit 110b ejects the droplet 21b. Similarly, the ejection unit 110c ejects the liquid enemy 21c, and the ejection unit 110d ejects the droplet 21d. The droplet 21a, the droplet 21b, the droplet 21c, and the droplet 21d are the carbon nanotube ink composition 21 sprayed as fine particles. The droplet 21a, the droplet 21c, and the droplet 21d shown in FIG. 2 are in a state where they are ejected from the ejection units and fall downward.

  The ejection unit 110a ejects two droplets 21a. The discharge part 110b does not emit the droplet 21b. The ejection unit 110c ejects five droplets 21c. The ejection unit 110d ejects one droplet 21d. As described above, when the carbon nanotube ink composition 21 not containing diethylene glycol monobutyl ether is filled and sprayed in the head 110 of the ink jet printer, the discharge amount is uneven, and a stable spray state cannot be obtained.

(Examples 2 to 10)
The carbon nanotube ink compositions 2 to 10 manufactured based on the same manufacturing method as in Example 1 using the substances shown in the embodiments in the respective compositions of the carbon nanotube, the solvent, and the glycol ethers will be described. To do.

  Table 1 is a table showing the evaluation results of the carbon nanotube ink composition, the sprayed state from the head 100 of the inkjet printer, the dispersibility of the carbon nanotubes, and the storage stability of the dispersed carbon nanotubes.

Carbon nanotube ink compositions 2 to 10 shown in Table 1 were produced by the same production method as in Example 1. (A) in the table represents a carbon nanotube, (B) represents a glycol ether, and (C) represents a solvent. In addition, the B-1 to B-7 compounds in the table are as follows.
B-1: Triethylene glycol monoethyl ether B-2: Tripropylene glycol monopropyl ether B-3: Diethylene glycol diethyl ether B-4: Triethylene glycol monobutyl ether B-5: Diethylene glycol dibutyl ether B-6: Dipropylene glycol Diisopropyl ether B-7: Propylene glycol dibutyl ether

  Carbon nanotube ink compositions 22 to 25 shown in Table 1 were produced without using glycol ethers (B). The carbon nanotube ink compositions 22 to 25 were produced in the same manner as the carbon nanotube ink composition 21 as a comparison with Example 1 except that the carbon nanotubes (A) and the solvent (C) shown in Table 1 were used.

  The evaluation result of the spray state from the head 100 of the inkjet printer will be described. In the spray state from the head 100 of the ink jet printer, “◎” in the evaluation result column indicates a stable spray state. Δ indicates discharge but not a stable spray state. X shows that it cannot discharge at all. Referring to Table 1, all of the carbon nanotube ink compositions 2 to 10 of the present invention obtained a stable spray state. On the other hand, none of the carbon nanotube compositions 22 to 25 containing no glycol ethers (B) was able to obtain a stable spray state.

  The dispersibility of the carbon nanotube (A) and the storage stability of the dispersed carbon nanotube (A) will be described. Immediately after production represents immediately after sonication, 10 days after represents 10 days after sonication, and 30 days after 30 days after sonication. ◎ in the evaluation column of the dispersion state indicates that there is no residue or precipitate. Δ indicates that there are residues and precipitates. X indicates that all the carbon nanotubes (A) were precipitated. In the carbon nanotube ink compositions 2 to 10 of the present invention, excellent results were obtained in the dispersibility of the carbon nanotube (A) and the storage stability of the dispersed carbon nanotube (A).

(Example 11)
The carbon nanotube ink composition 11 will be described in which a polyethylene glycol alkyl ether compound having an alkyl group having 10 or more carbon atoms as a substituent is further added to the composition of carbon nanotubes, a solvent, and glycol ethers.

The carbon nanotube ink composition 11 is manufactured by the following procedure. First, 100 mg of SWCNT prepared by the Hipco method was weighed into a glass container, and 1 g of diethylene glycol monobutyl ether was added. Further, 1 g of a polyethylene glycol alkyl ether compound (molecular weight 1000) into which C ₁₈ H ₃₇ O (lauryl alkoxy group) was introduced at the terminal was added. Next, 10 g of water was added to the glass container, and ultrasonic treatment was performed for 1 hour using an ultrasonic device to obtain a carbon nanotube ink composition 11. The carbon nanotube ink composition 11 immediately after the ultrasonic treatment showed a uniform black form, and no residue or precipitate was observed. Further, when the carbon nanotube ink composition 11 was observed after 10 days and 30 days, no residue or precipitate was observed as in the case immediately after the production.

  When the carbon nanotube ink composition 11 was filled in the head 100 of an inkjet printer manufactured by Konica Minolta and the ink filling state and the spraying state were observed, a stable spraying state was obtained with a constant discharge amount as in FIG.

  As a comparative example, a carbon nanotube ink composition 26 was produced in the same manner as in Example 11 except that diethylene glycol monobutyl ether of glycol ethers was not used. When the ink filling state and the spraying state of the carbon nanotube ink composition 26 were observed in the same manner as in Example 11, it was difficult to eject from the head 100 and stable droplets could not be formed.

  In addition, when the dispersibility of the carbon nanotube ink composition 26 was observed, it was finely dispersed immediately after the ultrasonic treatment, but some precipitation occurred after 10 days and 30 days, and stable dispersibility could not be obtained. It was.

  As described above, the superiority of the present invention has been described based on the preferred examples. However, the carbon nanotube ink composition according to the present invention is not limited to the examples, and various modifications can be made from the configuration of the examples. And modified carbon nanotube ink compositions are also within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1a Droplet 1b Droplet 1c Droplet 1d Droplet 21a Droplet 21c Droplet 21d Droplet 100 Head 110 Tip part 110a Discharge part 110b Discharge part 110c Discharge part 110d Discharge part

Claims (8)

Carbon nanotubes,
Glycol ethers,
A solvent,
A carbon nanotube ink composition comprising: The carbon nanotube ink composition according to claim 1,
The glycol ethers are
A carbon nanotube ink composition selected from the group consisting of a monoethylene glycol ether compound, a diethylene glycol ether compound, a triethylene glycol ether compound, a monopropylene glycol ether compound, a dipropylene glycol ether compound, and a tripropylene glycol ether compound. The carbon nanotube ink composition according to claim 1 or 2,
The glycol ethers are
Glycol ether monomethyl ether compound, glycol ether dimethyl ether compound, glycol ether monoethyl ether compound, glycol ether diethyl ether compound, glycol ether monopropyl ether compound, glycol ether dipropyl ether compound, glycol ether monoisopropyl ether compound, glycol ether diisopropyl ether compound A carbon nanotube ink composition selected from the group consisting of a glycol ether monobutyl ether compound, a glycol ether dibutyl ether compound, a glycol ether monoisobutyl ether compound, and a glycol ether diisobutyl ether compound. The carbon nanotube ink composition according to any one of claims 1 to 3,
The carbon nanotube ink composition, wherein the solvent is water. The carbon nanotube ink composition according to any one of claims 1 to 3,
The solvent is an organic solvent. Carbon nanotube ink composition. The carbon nanotube ink composition according to any one of claims 1 to 5,
A carbon nanotube ink composition further comprising a polyethylene glycol alkyl ether compound containing an alkyl group having 10 or more carbon atoms as a substituent. Filling an ink jet printer with the carbon nanotube ink composition according to any one of claims 1 to 6;
Spraying from the inkjet printer and applying the carbon nanotube ink composition to a substrate;
A method for producing a carbon nanotube film comprising: It is a manufacturing method of the carbon nanotube film according to claim 7,
A method for producing a carbon nanotube film, further comprising the step of heating and drying the carbon nanotube ink composition applied to the substrate at a temperature of a boiling point of the solvent.