Nanocellulose–polyurethane substrate material with tunable mechanical properties for wearable electronics

Pekka Pursula (Corresponding Author), Kaisa Kiri, Colm McCaffrey, Henrik Sandberg, Jari Vartiainen, Jacek Flak, Panu Lahtinen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Wearable electronics require thin and flexible substrate materials for user comfort. We propose a substrate material based on a nanocellulose–polyurethane matrix. The stretchability, i.e. Young's modulus and breaking strain, of the material can be tuned by nanocellulose concentration. We describe the fabrication process and demonstrate the modulation of the mechanical properties. Further, we present oxygen and water vapour permeability, as well as dielectric properties' measurements. Effects of substrate properties on printing of metallic conductors are considered. Laser cutting of the substrate and lamination of several layers of substrate material together are demonstrated, as well as hybrid integration of discrete components on the substrate. As an integrated demonstrator, a patch for local skin surface temperature measurement is presented. The patch thickness is 50 μm, and it consists of two layers of the substrate material, printed metallic conductors and hybrid integrated temperature sensors.
Original languageEnglish
Article number045002
Number of pages12
JournalFlexible and Printed Electronics
Volume3
DOIs
Publication statusPublished - 8 Nov 2018
MoE publication typeA1 Journal article-refereed

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Mechanical properties
Substrates
Surface measurement
Steam
Temperature sensors
Wearable technology
Temperature measurement
Dielectric properties
Water vapor
Printing
Skin
Elastic moduli
Modulation
Oxygen
Fabrication
Lasers

Cite this

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abstract = "Wearable electronics require thin and flexible substrate materials for user comfort. We propose a substrate material based on a nanocellulose–polyurethane matrix. The stretchability, i.e. Young's modulus and breaking strain, of the material can be tuned by nanocellulose concentration. We describe the fabrication process and demonstrate the modulation of the mechanical properties. Further, we present oxygen and water vapour permeability, as well as dielectric properties' measurements. Effects of substrate properties on printing of metallic conductors are considered. Laser cutting of the substrate and lamination of several layers of substrate material together are demonstrated, as well as hybrid integration of discrete components on the substrate. As an integrated demonstrator, a patch for local skin surface temperature measurement is presented. The patch thickness is 50 μm, and it consists of two layers of the substrate material, printed metallic conductors and hybrid integrated temperature sensors.",
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AU - McCaffrey, Colm

AU - Sandberg, Henrik

AU - Vartiainen, Jari

AU - Flak, Jacek

AU - Lahtinen, Panu

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