Jang-Ung Park
Ulsan National Institute of Science and Technology, South Korea
Title: Fabrication of fl exible, transparent, and skin-attachable fi eld-effect transistor (FET) sensors based on graphene-silver nanowires
Biography
Biography: Jang-Ung Park
Abstract
Flexible and transparent conductive materials have been vigorously investigated as the next-generation electrodes to cover the disadvantages of conventional indium tin oxide (ITO) such as poor mechanical robustness on fl exible substrates. A variety of materials such as carbon nanotubes (CNTs), graphene, metal nanowires and conducting polymers have been appliedto fl exible electrodes in transparent electronics. Especially, graphene-silver nanowires (AgNWs) hybrid structures have been considerably researched due to their high transparency and conductivity.Also, graphene and AgNWs hybrid fi lmscouldprevent the oxidation of AgNWs and complement relatively high sheet resistance of graphene. In this talk, we present the fabricationof fl exible and transparent electronic devices, including fi eld eff ect transistor (FET) sensors, using graphene-AgNW hybrid fi lms as electrodes. These transistors show relatively high mobility (~3000 cm2V-1s-1) because of the low graphene-AgNW contact resistance (~0.3 kΩ·μm). In addition, the devices could be directly integratedon very thin andfl exible substrates as well as human skin, exhibiting their versatility and bio-compatibility. Furthermore, we demonstrate the real-time wireless nanosensors for monitoring the materials operating at radio frequency (~-30 dB at the center frequency of 4.4 GHz) without power consumption. Th is device can be used as ultrasensitive mannan-binding lectin (MBL, Concanavalin A) sensors. Fabrication of fl exible, transparent transistors using the hybrid electrodes demonstrates the substantial promise of future electronics