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Carbon nanotubes as a material for functional inks. / Neil Graddage

Swansea University Author: Neil Graddage

Abstract

Carbon nanotubes (CNTs) have been proposed as a material for use in printed electronics for a number of years. The potential to exploit the unique electrical and mechanical properties of these structures on the macro-scale is appealing; however there are a number of hurdles to overcome. Printing all...

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Published: 2012
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42538
first_indexed 2018-08-02T18:54:57Z
last_indexed 2018-08-03T10:10:25Z
id cronfa42538
recordtype RisThesis
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spelling 2018-08-02T16:24:29.6029952 v2 42538 2018-08-02 Carbon nanotubes as a material for functional inks. 686d2dde7e42e8aaca5300b39d4c4c38 NULL Neil Graddage Neil Graddage true true 2018-08-02 Carbon nanotubes (CNTs) have been proposed as a material for use in printed electronics for a number of years. The potential to exploit the unique electrical and mechanical properties of these structures on the macro-scale is appealing; however there are a number of hurdles to overcome. Printing allows the deposition of CNT networks, the properties of which are governed by the CNT type and network density. The formulation of a suitable ink and deposition of a film with specific properties is challenging, and the work described in this thesis is concentrated on two specific areas, CNT ink development and CNT based device production. The CNT ink was developed by identifying key ink and dried film parameters for characterisation and assessing the effect of several major variables, namely the resin material, resin concentration, processing temperature, CNT concentration, CNT functionality and processing energy. A suitable research ink was developed and optimised using N-methyl-2-pyrrolidone as the solvent and polyvinyl alcohol as the resin at a concentration ratio of 1:1 with the CNT content. The effects of CNT concentration, CNT functionality and processing energy are shown to be interdependent. This is among the first reported studies to investigate the dependence of these factors upon a CNT ink for roll-to-roll processing. This ink system was then used in the production of CNT based thin film transistor (TFT) devices using flexography. Initially the concept was proven using MWCNTs. The design was then refined and devices were produced using SWCNTs at varying network densities. It was seen that the printing of CNT based devices using flexography is feasible, though careful control of the CNT network density is required to achieve suitable device performance. This is the first reported production of TFTs using flexography, and the first reported use of flexograi)hy to deposit CNTs. E-Thesis Materials science.;Nanotechnology. 31 12 2012 2012-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.6029952 2018-08-02T16:24:29.6029952 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Neil Graddage NULL 1 0042538-02082018162502.pdf 10805287.pdf 2018-08-02T16:25:02.3970000 Output 25531949 application/pdf E-Thesis true 2018-08-02T16:25:02.3970000 false
title Carbon nanotubes as a material for functional inks.
spellingShingle Carbon nanotubes as a material for functional inks.
Neil Graddage
title_short Carbon nanotubes as a material for functional inks.
title_full Carbon nanotubes as a material for functional inks.
title_fullStr Carbon nanotubes as a material for functional inks.
title_full_unstemmed Carbon nanotubes as a material for functional inks.
title_sort Carbon nanotubes as a material for functional inks.
author_id_str_mv 686d2dde7e42e8aaca5300b39d4c4c38
author_id_fullname_str_mv 686d2dde7e42e8aaca5300b39d4c4c38_***_Neil Graddage
author Neil Graddage
author2 Neil Graddage
format E-Thesis
publishDate 2012
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description Carbon nanotubes (CNTs) have been proposed as a material for use in printed electronics for a number of years. The potential to exploit the unique electrical and mechanical properties of these structures on the macro-scale is appealing; however there are a number of hurdles to overcome. Printing allows the deposition of CNT networks, the properties of which are governed by the CNT type and network density. The formulation of a suitable ink and deposition of a film with specific properties is challenging, and the work described in this thesis is concentrated on two specific areas, CNT ink development and CNT based device production. The CNT ink was developed by identifying key ink and dried film parameters for characterisation and assessing the effect of several major variables, namely the resin material, resin concentration, processing temperature, CNT concentration, CNT functionality and processing energy. A suitable research ink was developed and optimised using N-methyl-2-pyrrolidone as the solvent and polyvinyl alcohol as the resin at a concentration ratio of 1:1 with the CNT content. The effects of CNT concentration, CNT functionality and processing energy are shown to be interdependent. This is among the first reported studies to investigate the dependence of these factors upon a CNT ink for roll-to-roll processing. This ink system was then used in the production of CNT based thin film transistor (TFT) devices using flexography. Initially the concept was proven using MWCNTs. The design was then refined and devices were produced using SWCNTs at varying network densities. It was seen that the printing of CNT based devices using flexography is feasible, though careful control of the CNT network density is required to achieve suitable device performance. This is the first reported production of TFTs using flexography, and the first reported use of flexograi)hy to deposit CNTs.
published_date 2012-12-31T04:39:22Z
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score 11.39484

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