Paper-Based\nInkjet-Printed Flexible Electronic Circuits

Abstract

Printed flexible\nelectronics have been widely studied for their\npotential use in various applications. In this paper, a simple, low-cost\nmethod of fabricating flexible electronic circuits with high conductivity\nof 4.0 × 10⁷ S·m^–1 (about 70%\nof the conductivity of bulk copper) is demonstrated. Teslin paper\nsubstrate is treated with stannous chloride (SnCl₂) colloidal\nsolution to reduce the high ink absorption rate, and then the catalyst\nink is inkjet-printed on its surface, followed by electroless deposition\nof copper at low temperature. In spite of the decrease in conductance\nto some extent, electronic circuits fabricated by this method can\nmaintain function even under various folding angles or after repeated\nfolding. This developed technology has great potential in a variety\nof applications, such as three-dimensional devices and disposable\nRFID tags.