Evaluating silver tracks conductivity on flexible surfaces

Abstract

The development of electric circuit fabrication on flexible polymer substrates has attracted significant interest as a pathway to low-cost, comfortable movement and large-area electronics among direct printing techniques. The term electronic textiles, or e-textiles, are used to denote the class of fabric structures that integrate electronic elements with textiles and can sense changes in its environment and respond to it. This new class of wearable electronic systems is being designed to meet new and innovative applications in the military, public safety, healthcare, space exploration, sports and consumer fitness fields. In this paper the inkjet printing technique (office thermal inkjet printer) was used as a simple method to chemically deposit silver Nanoparticles (85–300 nm) to the flexible surface. It is done by ejection of silver nitrate and ascorbic acid as a reducing agent to attain nanometals on the surface. Ink concentration and repeating the printing sequence of each ink determines molar ratio ejection of ink and is found to be necessary to be evaluated in order to attain the highest level of conductivity. The main purpose of this work is to gain the highest conductive printed tracks by using statistical design of experiment method on the fabric surface by applying inkjet technique. By optimizing the mentioned parameters, the highest conductivity of printed flexible tracks on the surface of paper is gained 8.0635 × 105 S/m and the result for polyester fabric is obtained 1.2417 × 104 S/m whereas metallic silver wire has a conductivity of 6.173 × 107 S/m.