Electronic textile (E-textile) where various electronic elements are integrated on fabrics have received tremendous attention for advanced wearable and flexible devices which are considered as the next generation technologies. Especially, textile-based applications such as pressure sensors and strain sensors have been widely studied for detecting vital signals of patients, medical diagnostics, and human body motion detection by embedding them in clothes. For the realization of ultra-sensible textile-based sensor applications, various types of sensing mechanisms such as resistive, capacitive, piezoelectric, piezoresistive, and optical types have been introduced. In general, sensor applications should consist of conductive materials for electrical operation in aforementioned mechanisms. However, it is very challenging to demonstrate textile-based sensor applications with conventional conductive materials due to the low mechanical properties such as flexibility and stretchability. Furthermore, unfamiliar textures of the conventional conductive materials hindered its practical usage.
Herein, we describe a novel method of fabricating ultra-sensitive sensor applications based on highly conductive and stretchable fibers. The fabrication process of conductive and stretchable fiber is based on chemical reduction process of metal ions in elastomeric polymer. First, metal ions were absorbed by dipping the polymer into metal precursor solution and metal nanoparticles are synthesized using reducing agent. We confirmed that metal nanoparticles are uniformly distributed in elastomeric polymer matrix. This conductive and stretchable fiber exhibited superior electrical conductivity (σ0 = 2450 S/cm) and elongation at break (900% strain). The ultra-sensible textile-based capacitive sensor was fabricated by uniform coating of polymeric dielectric layers on the surfaces of the conductive fibers. The textile-based pressure sensors were successfully applied to control robots by detecting hand motion using the fabric pressure sensor-integrated gloves. The highly stretchable conductive fiber-based resistive strain sensor was fabricated by embedding a composition of metal nanowires and metal nanoparticles in an elastomeric polymer. We also successfully utilized the fiber-based strain sensor for detecting simple sign language.
- 1998.08-2004.12, Ph.D. Materials Science & Engineering Dept., University of Illinois at Urbana-Champaign
- 1995.08-1997.07, M.S. Metallugical Engineering Dept., Yonsei University
- 1995, B.S. Metallugical Engineering Dept., Yonsei University
- 2018, Technical Program Committee, IUMRS-ICEM 2018
- 2017.01-, 총무국제이사, 한국재료학회
- 2017-, Editorial Board, Scientific Reports
- 2015-, Convenor, International Electrotechnical Commission (IEC)
- 2017.03-, Senior Fudan Fellow, Department of Material Science, Fudan University
- 2013.03-, Associate Professor, School of Electrical & Electronic Engineering, Yonsei University
Awards and Honors
- 2008-2011, Guest editor, Thin Solid Films
- 2008, SCI 위원, 전기전자재료학회
- 2007.07-2005.01, Senior Process Engineer, Intel Corporation CTM/FMG