High-Precision Fabrication of Graphene Nanoplatelet-Based Piezoresistive Strain Sensors Using PµSL 3D Printing Technology

Engincan Tekin, Ming Cao, Ajay Giri Prakash Kottapalli*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

This study presents the design and high-precision
fabrication of 3D printed strain sensors, which feature
graphene nanoplatelet based piezoresistive sensing elements.
The strain sensor features fully encapsulated microfluidic
inner channels, 500µm in diameter, created using Projection
Micro Stereolithography (PµSL) 3D printing technology. A
flexible printed strain sensor was achieved through the
creation of a custom resin mixture. The strain gauges were
printed in 20 µm layers, resulting in a dimensional printing
error rate of less than 3%, and exhibited fine structural
details and high resolution. Graphene nanoplatelet inks of
three different concentrations (5%, 10%, and 20%) were
used to form the piezoresistive sensing elements. The gauge
factors (GFs) for the 10% and 20% strain sensors were
determined to be 28 and 19, respectively. The strain sensor
with the lowest concentration (5%) showed a high GF of 13.5
and 564 in the strain ranges 0% to 13% and 13% to 18.5%.
These findings introduce PµSL 3D printing as a method to
form flexible piezoresistive strain sensors and highlight the
impact of nanomaterial concentration on piezoresistive
performance, demonstrating a potential for applications in
customized, high-performance strain sensors.
Original languageEnglish
Title of host publicationIEEE SENSORS 2024
Subtitle of host publicationThe 23rd IEEE Conference on Sensors
PublisherIEEE
ISBN (Electronic)979-8-3503-6351-7
ISBN (Print)979-8-3503-6352-4
DOIs
Publication statusPublished - 17-Dec-2024
EventIEEE Sensors 2024 - Japan, Kobe, Japan
Duration: 20-Oct-202423-Oct-2024
https://2024.ieee-sensorsconference.org/

Conference

ConferenceIEEE Sensors 2024
Abbreviated titleIEEE Sensors 2024
Country/TerritoryJapan
CityKobe
Period20/10/202423/10/2024
Internet address

Keywords

  • Flexible electronics
  • Bioinspiration
  • MEMS
  • Piezoresistive sensors
  • Sensors

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