University of Oulu

Ronja Valasma et al 2020 Nanotechnology 31 305303

Grid-type transparent conductive thin films of carbon nanotubes as capacitive touch sensors

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Author: Valasma, Ronja1; Bozo, Eva1; Pitkänen, Olli1;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, PO Box 4500, FI-90014 University of Oulu, Finland
2Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged 6720, Hungary
3MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, Rerrich B. tér 1, Szeged 6720, Hungary
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.6 MB)
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Language: English
Published: IOP Publishing, 2020
Publish Date: 2020-07-02


Transparent conductive films are used in a wide variety of devices. While solar cell top electrodes as well as tablet and mobile phone screens require high optical transparency and low sheet resistance (>80% and <10 Ω/❑) to maximize power efficiency; other, less demanding applications, such as those in capacitive touch panels and antistatic coatings, in which only small currents are involved, can be managed with coatings of moderate conductivity. In this paper, we show that area-selective argon plasma treated polyethylene terephthalate surfaces are suitable for localized deposition of carbon nanotubes from their aqueous dispersions by a simple dip coating and subsequent drying processes. The as-deposited carbon nanotubes form entangled networks in microscopic patterns over the plasma-treated surface areas with sheet resistance of <1 kΩ/❑ and optical transparency of ~75%. Based on this process, we demonstrate grid-type transparent conductive thin films of carbon nanotubes as capacitive touch sensors. Since each process step is robust, easy to up and downscale, and may be implemented even in roll-to-roll and sheet-to-sheet fabrication, the demonstrated technology is promising to produce grid-type structures even at an industrial scale in the future.

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Series: Nanotechnology
ISSN: 0957-4484
ISSN-E: 1361-6528
ISSN-L: 0957-4484
Volume: 31
Issue: 30
Article number: 305303
DOI: 10.1088/1361-6528/ab8590
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
Funding: This work was supported by the EU Interreg Nord and Lapin liitto (project Transparent, Conducting and Flexible films for electrodes), EU BBI JU (project NewPack), University of Oulu (project Entity) and by the Academy of Finland (project Nigella).
Copyright information: © 2020 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.