University of Oulu

Ervasti, H., Järvinen, T., Pitkänen, O., Bozó, É., Hiitola-Keinänen, J., Huttunen, O.-H., Hiltunen, J., & Kordas, K. (2021). Inkjet-Deposited Single-Wall Carbon Nanotube Micropatterns on Stretchable PDMS-Ag Substrate–Electrode Structures for Piezoresistive Strain Sensing. ACS Applied Materials & Interfaces, 13(23), 27284–27294.

Inkjet-deposited single-wall carbon nanotube micropatterns on stretchable PDMS-Ag substrate-electrode structures for Piezoresistive strain sensing

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Author: Ervasti, Henri1; Järvinen, Topias1; Pitkänen, Olli1;
Organizations: 1Microelectronics Research Unit, University of Oulu, FIN-90570 Oulu, Finland
2VTT Technical Research Centre of Finland, FIN-90590 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 11.1 MB)
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Language: English
Published: American Chemical Society, 2021
Publish Date: 2021-08-23


Printed piezoresistive strain sensors based on stretchable roll-to-roll screen-printed silver electrodes on polydimethylsiloxane substrates and inkjet-deposited single-wall carbon nanotube micropatterns are demonstrated in this work. With the optimization of surface wetting and inkjet printing parameters, well-defined microscopic line patterns of the nanotubes with a sheet resistance of <100 Ω/□ could be deposited between stretchable Ag electrodes on the plasma-treated substrate. The developed stretchable devices are highly sensitive to tensile strain with a gauge factor of up to 400 and a pressure sensitivity of ∼0.09 Pa–1, respond to bending down to a radius of 1.5 mm, and are suitable for mounting on the skin to monitor and resolve various movements of the human body such as cardiac cycle, breathing, and finger flexing. This study indicates that inkjet deposition of nanomaterials can complement well other printing technologies to produce flexible and stretchable devices in a versatile manner.

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Series: ACS applied materials & interfaces
ISSN: 1944-8244
ISSN-E: 1944-8252
ISSN-L: 1944-8244
Volume: 13
Issue: 23
Pages: 27284 - 27294
DOI: 10.1021/acsami.1c04397
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
116 Chemical sciences
Funding: We thank Arttu Korhonen (VTT Technical Research Centre of Finland), Tuomo Siponkoski, and Petra Palvölgyi (both with the University of Oulu) for their technical assistance. Financial support was received partly from EU Interreg Nord-Lapin liitto (project Transparent, conducting and flexible films for electrodes), and University of Oulu (projects Entity and PoC: Ultralow permittivity and loss porous nanocomposites for future 6G telecommunication). Printed Intelligence Infrastructure (PII-FIRI, grant no. 320020) is acknowledged. Part of the work was carried out with the support of the Centre for Material Analysis, University of Oulu, Finland.
Copyright information: © The Authors 2021. Published under the Creative Commons Attribution License.