Pencil-on-paper strain sensor for flexible vertical interconnection

There has been an increasingly interest in the use of paper as inexpensive, foldable and disposable substrate material. In this paper, a novel pencil-on-paper strain sensor for flexible vertical interconnection is proposed. Graphite traces were used to fabricate the device. The strain changes would result in resistance changes depending on the graphite particles movement, thus, rotation strain can be detected. The sensor can also differentiate compressive and tensile signals. The proposed method presents a further expansion of fast and simple solution for realizing the full potential of paper substrate.