Method of conductive layer forming on carbon nanotube base

FIELD: electricity.

SUBSTANCE: invention refers to electrical engineering, particularly to methods of conductive layer formation used in wide range of technics, including electronics or electrical equipment, and can be applied to form conductive links in microcircuits. Method of conductive layer formation on carbon nanotube base involves application of suspension of carbon nanotubes and carboxymethyl cellulose in water onto substrate, with the following component ratio, wt %: carboxymethyl cellulose 1-10, carbon nanotubes 1-10, drying at 20 to 150°C, pyrolysis at temperature over 250°C.

EFFECT: enhanced electric conductivity of layers formed.

4 cl, 1 tbl

 

The invention relates to the field of electrical engineering, in particular to methods for creating electrically conductive layers applied in broad areas of technology, including electronics, and can be used, for example, to create a conductive connection in circuits.

Currently known technical solution "Nanostructured composites" in the American patent application US 2010/0068461 A1 (IPC VS 39/02; VV 3/10 published 18.03.2010 g) obtaining nanostructured composite electrically conductive material using arrays of carbon nanotubes (CNTS) and the polymer matrix. As the polymer matrix used materials from the following groups: acrylates, acrylic acid, polyacrylic esters, polyacrylamides, polyacrylonitrile, chlorinated polymers, fluorinated polymers, polymers of styrene, polyurethane, rubber, synthetic rubber polymers, vinyl chloride-acrylate polymers, copolymers, and combinations thereof. The disadvantage of this method of obtaining nanostructured electrically conductive material is a multi-stage process of forming electrically conductive material, the use of structured arrays of CNTS, limiting the maximum geometrical dimensions of electrically conductive material and a low electric conductivity was obtained about the ukta.

The closest to the essential features (prototype) of the invention is the method described in the application U.S. for the invention of "Carbon nanotube-conductive polymer composites, methods of making and articles made therefrom" US 2012/0058255 A1 (IPC B05D 5/12; H01B 1/02; H01B 1/04; H01B 1/12 published on 08.03.2012 year). In this invention to create a composite conductive material is a conductive polymer with the addition of functionalized carbon nanotubes. This functionalization of CNTS produced by various groups, including: -COOH, -HE-COOAg group. Signs consistent with the claimed invention, are applied to the substrate suspension containing the carbon nanotubes, drying at temperatures up to 150°C.

To obtain the desired technical result prevent the use of only functionalized carbon nanotubes, conducting additional processing CNT for the formation of functional groups on the surface of CNTS, the use of conductive polymers to improve the conductivity of the resulting material, which reduces the amount of organic compounds as polymer matrix and restricts the use of the obtained electrically conductive material.

The present invention is to provide a method of forming a conductive layer based on carbon nanotubes is K.

The technical result consists in extending the functionality of the method of forming a conductive layer on the basis of the carbon nanotubes in the CNT without additional chemical treatment after synthesis, to increase the conductivity of the formed layers.

To achieve the above technical result of the method of forming a conductive layer on the basis of the carbon nanotubes comprises applying to the substrate a suspension containing the carbon nanotubes and the solution of carboxymethylcellulose in water in the following ratio, wt.%: carboxymethylcellulose 1-10 and 1-10 carbon nanotubes, drying at a temperature of from 20 to 150°C, the pyrolysis at a temperature of 250°C-300°C.

From the prototype of this method differs in that caused the suspension contains a solution of carboxymethylcellulose in water in the following ratio, wt.%: carboxymethylcellulose 1-10 and 1-10 carbon nanotubes, drying is carried out at a temperature of from 20 to 150°C, as the final stage carry out the pyrolysis of carboxymethyl cellulose at temperatures above 250°C.

The introduction of the specified operation allows to form conductive layers on the basis of carbon nanotubes with sufficient reproducibility. By drying to remove the water from the suspension. Conducting pyrolysis of CT is Oxymetazoline allows to increase the conductivity of the layers due to decomposition of organic compounds. When carrying out the claimed process produces a structure of a conductive layer different from the patterns obtained by carrying out the method according to the prototype.

In private cases, the execution of the invention the substrate using metal, ceramics, glass, silicon, silicon oxide, silicon nitride or composition.

In private cases, the execution of the invention the coating suspension onto the substrate is carried out by a method of printing or silkscreen printing.

In private cases, the execution of the invention the drying conduct heat and/or vacuum method.

The set of features that characterize the invention allows to form conductive layers on the basis of carbon nanotubes using carbon nanotubes without functional groups on the surface of CNTS and without the use of conductive polymers.

The invention is illustrated by table comparing the characteristics of the achieved technical result with the result presented in the prototype.

Method of forming a conductive layer on the basis of carbon nanotubes includes the steps of: applying to the substrate a suspension containing the carbon nanotubes and the solution of carboxymethylcellulose in water in the following ratio, wt.%: carboxymethylcellulose 1-10 and 1-10 carbon nanotubes, drying at a temperature of from 20 to 150°C, the pyrolysis at a temperature of either the 250°C.

Example 1

For the formation of the conductive layer based on carbon nanotubes form a solution of carboxymethyl cellulose (CMC) in water by adding 6 wt.% CMC in water and mixing the components by mechanical means with a magnetic stirrer for 60 minutes, adding 5 wt.% CNTS to the solution and mixing the suspension with ultrasound exposure for 90 min, applying the slurry on a substrate by screen printing, the solvent (water) from the suspension at a temperature of 90°C at a pressure of 10 kPa for 20 min, conducting pyrolysis of organic compounds at a temperature of 300°C at a pressure of 10 kPa for 25 minutes

The conductivity of the obtained conductive layer on the basis of CNT is equal to 50000 Cm/m In the table presents a comparison of the achieved results with the prototype. The result shows that pyrolysis of organic compounds can improve the conductivity of the material without conducting functionalization of CNTS and the use of conductive polymers.

Example 2

For the formation of the conductive layer based on carbon nanotubes form a solution of CMC in water by adding 6 wt.% CMC in water and mixing the components by mechanical means with a magnetic stirrer for 60 minutes, adding 5 wt.% CNTS to the solution and stirring su is pensii using ultrasonic treatment for 90 min, applying the suspension to the substrate by screen printing, the solvent (water) from the suspension at a temperature of 90°C at a pressure of 10 kPa for 20 min, followed by pyrolysis of organic compounds at a temperature of 200°C at a pressure of 10 kPa for 25 minutes

The conductivity of the obtained conductive layer on the basis of CNT is equal to 1000 Cm/m the result shows that at 200°C, which is 50°C less than the temperature of the beginning of the pyrolysis CMC, there is no decomposition of organic compounds and the conductivity of the material is still low.

Table
Comparative characteristics of the achieved technical result with the result presented in the prototype.
The properties of the nanomaterialInventionThe placeholder
The concentration of carbon nanotubes, wt.%55
Conductivity, Cm/m5000040000
FormThree-dimensional, any configurationNita is ignoe fiber

1. Method of forming a conductive layer based on carbon nanotubes, comprising applying to the substrate a suspension containing the carbon nanotubes and the solution of carboxymethylcellulose in water in the following ratio, wt.%: carboxymethylcellulose 1-10 and 1-10 carbon nanotubes, drying at a temperature of from 20 to 150°C, the pyrolysis at temperatures above 250°C.

2. The method according to claim 1, characterized in that the substrate using metal, ceramics, glass, silicon, silicon oxide, silicon nitride or composition.

3. The method according to claim 1, characterized in that the coating suspension onto the substrate is carried out by a method of printing or silkscreen printing.

4. The method according to claim 1, characterized in that the drying conduct heat and/or vacuum means.



 

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