Dr. Soon-Gil YoonProfessor, Department of Materials Science and Engineering,
Chungnam National University, Republic of Korea
Speech Title: Mechanical Strength of SZO-PTFE and ZnO-PTFE Films for High-Sensitivity Touch Sensor Applications
Abstract: Flexible and transparent antimicrobial touch/tactile sensors have received considerable attention on account of their wider applicability in personal electronic devices. For electronic devices, coated films should have an enough mechanical strength because of many touches in the case of smart phone applications. Herein, SZO-PTFE and ZnO-PTFE composite thin films with sensorial capabilities and high mechanical strengths are developed via a co-sputtering technique. Mechanical strengths of the composite films were investigated via micro-indenter. Their mechanical strengths showed similar results to that of the glass substrate. Elastic modulus and hardness of the ZnO-PTFE composite films showed almost 90 GPa (that of glass: 70 GPa) and 5.5 GPa (that of glass: 6.1 GPa), respectively. They showed a good adhesion between composite films and glass substrate via adhesive tape test. Furthermore, the linear response of the TENG to driven pressure indicates its excellent pressure-sensing ability, with an unprecedented sensitivity of 75.31 V/kPa and a touch sensitivity of 31.36 V/kPa. Further, the real-time application of ZnO-PTFE as display coating and self-powered touch sensor is demonstrated. This work demonstrates a simple route towards the design of smart coatings with high mechanical strengths.
Biography: Prof. Soon-Gil Yoon received his Ph.D. from the Korea Advanced Institute of Science and Technology (KAIST), Korea in 1988. He is a professor in Department of Materials Science and Engineering, Chungnam National University (CNU), Republic of Korea. His current research interests are Thin film capacitor, Fusion technology of Solar cell, Thermoelectric, and Piezoelectric using one material and one structure, In-situ graphene growth with no transfer at 100 oC via Plasma-assisted thermal CVD. He also published the results for applications of transfer-free graphene such as high stretchability and flexibility, etc. He has published in many Nano Energy Journals the results of the mechanical energy harvesting using piezoelectric and triboelectric energy nanogenerators. Organic/Inorganic perovskite thin films such as MAPbI3, MASnI3, MAPbCl3, MA3Bi2I9, etc deposited by CVD were applied at photodetectors. He had published about 410 peer-reviewed SCI papers including Nano Letters, Advanced Materials, ACS Nano, Nano Energy, J. Mater. Chem. A, Advanced Science, Nano Today, Chemical Engineering Journal, ACS Energy Letters, etc. He also has actively worked with three different big projects from Korea and was chosen at 1, March, 2022 as honorable chair professor in CNU.