Thermoformable Conductive Compositions for Printed Electronics

Seyed Ismail Seyed Shahabadi, Joel Ming Rui Tan, Shlomo Magdassi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The development of three-dimensional printed electronics has garnered significant interest due to the ease of integration of electronic circuitry on 3D surfaces. However, it is still very challenging to achieve the desired conformability, stretchability, and adhesion of conductive pastes used for printing on thermoformable substrates. In this study, we propose the use of novel thermoformable ink composed of copper flakes coated with silver, which enables us to prevent the oxidation of copper, instead of the commonly used silver inks. Various polymer/solvent/flake systems were investigated, resulting in thermoformable conductive printing compositions that can be sintered under air. The best inks were screen printed on PC substrates and were thermoformed using molds with different degrees of strain. The effects of the various components on the thermoforming ability and the electrical properties and morphology of the resulting 3D structures were studied. The best inks resulted in a low sheet resistivity, 100 mΩ/□/mil and 500 mΩ/□/mil before and after thermoforming at 20%, respectively. The feasibility of using the best ink was demonstrated for the fabrication of a thermoformable 3D RFID antenna on PC substrates.

Original languageAmerican English
Article number1548
JournalCoatings
Volume13
Issue number9
DOIs
StatePublished - Sep 2023

Bibliographical note

Funding Information:
This research is partially supported by a grant from the National Research Foundation, Prime Minister’s Office, Singapore, under its Campus of Research Excellence and Technological Enterprise (CREATE) program (SGSR and NEW programs) and by AMat Singapore.

Publisher Copyright:
© 2023 by the authors.

Keywords

  • copper conductive ink
  • printed electronics
  • screen printing
  • thermoforming

Fingerprint

Dive into the research topics of 'Thermoformable Conductive Compositions for Printed Electronics'. Together they form a unique fingerprint.

Cite this