CARBON NANOTUBE BASED TRANSPARENT CONDUCTIVE FILMS AND METHODS FOR PREPARING AND PATTERNING THE SAME
First Claim
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1. A method for generating a carbon nanotubes (CNTs) based ink for use with a transparent conductive film, the method comprising the following steps:
- providing one or more CNTs;
dispersing the one or more CNTs in a first solution containing a polymer to form a stable suspension; and
mixing the suspension with a second solution containing the polymer and at least one functional additive to form a stable ink having a desired ratio of the CNTs and the polymer.
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Abstract
Carbon nanotube (CNT) based transparent conductive films and methods for preparing and patterning the same are disclosed. For example, CNT based transparent conductive films with controlled transmittance and conductivity and methods of preparing and patterning the same are provided. Methods of preparing a CNT ink for assembling on a transparent substrate to form a transparent conductive film is disclosed, the ink can include a desired ratio of CNT with polymer. The transparent conductive film can be patterned such that desired properties are exhibited.
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Citations
29 Claims
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1. A method for generating a carbon nanotubes (CNTs) based ink for use with a transparent conductive film, the method comprising the following steps:
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providing one or more CNTs; dispersing the one or more CNTs in a first solution containing a polymer to form a stable suspension; and mixing the suspension with a second solution containing the polymer and at least one functional additive to form a stable ink having a desired ratio of the CNTs and the polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of assembling a transparent conductive film onto a transparent substrate, the method comprising:
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forming a carbon nanotubes (CNTs) ink comprising; dispersing CNTs in a first solution having conductive polymers; adding a high boiling-point solvent to a second solution having conductive polymers; adding a wetting agent to lower a surface tension of the second solution; dispersing an adhesion promoter in the second solution; adding an antioxidant to the second solution; adding the second solution to the first solution to form the CNTs ink; and coating the transparent substrate with the ink to form a transparent conductive film, whereby coating is performed using a technique selected from the group of roll-to-roll printing, spraying, and bar coating. - View Dependent Claims (14, 15, 16)
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17. A method of fabricating a flexible and adherent transparent conductive film with, the method comprising:
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purifying pre-made carbon nanotubes (CNTs) to remove one or more of catalysts, graphitic impurities, and amorphous carbon; dispersing the purified CNTs in a first solution comprising conductive polymers; adding a high boiling-point solvent to a second solution; adding a wetting agent to lower a surface tension of the second solution; adding antioxidants solution to the second solution to improve the environmental stability of transparent conductive films; adding an adhesion promoter to the second solution for improving adhesion of the solution; adding the second solution to the first solution to form an ink; and coating a substrate with the ink to form the transparent conductive film, whereby coating is performed using a technique selected from the group consisting of roll-to-roll printing, spraying and bar coating. - View Dependent Claims (18, 19, 20, 21)
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22. A method of fabricating a patterned carbon nanotube based transparent conductive film, the method comprising:
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purifying pre-made carbon nanotubes (CNTs) to remove catalysts, graphitic impurities, and amorphous carbon; dispersing the purified CNTs in a first solution containing conductive polymers; adding a high boiling-point solvent to a second solution; adding a wetting agent to lower a surface tension of the second solution; dispersing an adhesion promoter in alcohol; adding the adhesion promoter and alcohol to the second solution; adding antioxidants to the second solution; adding the second solution to the first solution whereby an ink forms; agitating the ink for improved adhesion; coating a substrate with the ink to form a conductive film, whereby coating is performed using a technique selected from the group consisting of including roll-to-roll printing, bar coating, and spraying; and printing a paste containing a strong oxidizing agent to cover selected areas of a top surface of the conductive film thereby leaving exposed areas of the top surface of the conductive film. - View Dependent Claims (23, 24, 25)
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26. A method of fabricating a patterned adherent carbon nanotube based transparent conductive film, the method comprising:
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forming an ink comprising carbon nanotubes (CNTs) dispersed in a polymer solution; coating the ink to a top surface of a substrate to form a conductive film, whereby coating is performed using a technique selected from the group consisting of roll-to-roll printing, bar coating, and spraying; preparing a patterned protection layer; applying the patterned protection layer to cover selected areas of a top surface of the conductive film thereby leaving exposed areas on the top surface of the conductive film; and curing the patterned protection layer. - View Dependent Claims (27, 28, 29)
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Specification