NON-DESTRUCTIVE MEASUREMENT OF CONDUCTIVITY OF ORIENTED SILVER NANOWIRES-POLYDIMETHYLSILOXANE COMPOSITES VIA TERAHERTZ TIME DOMAIN SPECTROSCOPY

Abstract

Due to their versatility, stretchable and transparent electrodes with metallic nanowires (NWs) have been used in various electronic fields of wearable and stretchable devices, such as light-emitting diodes and displays. Orienting the AgNWs on the transparent substrate can overcome the limitation of a trade-off between the optical transmittance and electrical conductivity observed at the electrodes of AgNWs with random distribution. In this study, the dip-coating method was used to coat and align the AgNWs on polydimethylsiloxane (PDMS) substrates according to a coating speed. From microscopy analysis, it was observed that the AgNWs on the PDMS substrate were well coated and aligned as intended. Additionally, the degree of AgNWs alignment according to coating speed was investigated by measuring birefringence characteristics of AgNWs/PDMS composites using terahertz time-domain spectroscopy. From the measurement result, the distribution of AgNWs on the PDMS substrate can be confirmed using the terahertz inspection method.