Inkjet-Deposited Single-Wall Carbon Nanotube Micropatterns on Stretchable PDMS-Ag Substrate-Electrode Structures for Piezoresistive Strain Sensing

Henri Ervasti, Topias Järvinen, Olli Pitkänen, Éva Bozó, Johanna Hiitola-Keinänen, Olli Heikki Huttunen, Jussi Hiltunen, Krisztian Kordas

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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 μ0.09 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.

Original languageEnglish
Pages (from-to)27284-27294
JournalACS Applied Materials & Interfaces
Volume13
Issue number23
DOIs
Publication statusPublished - 16 Jun 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • piezoresistive sensing
  • pressure, and bending sensors
  • printed electronics
  • strain
  • stretchable materials and devices

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