- Plenary Speakers -
Jong-Heun Lee has been a professor at the Department of Materials Science and Engineering, Korea University since 2003. His research interests include semiconductor gas sensors and functional oxide nanostructures. He received his BS, MS, and PhD degrees from Department of Inorganic Materials and Engineering, Seoul National University, Seoul, Korea, in 1987, 1989, and 1993, respectively. Between 1993 and 1999, as a senior researcher, he developed automotive air-fuel-ratio sensors at the Samsung Advanced Institute of Technology. He was a STA fellow at the National Institute for Research in Inorganic Materials (currently NIMS, Tsukuba, Japan) from 1999 to 2000 and a research professor at Seoul National University from 2000 to 2003. He is an editor of Sensors and Actuators B: Chemical and a regular member of the Korean Academy of Science and Technology. In 2014, he has been selected as 'Highly Cited Researchers' by Thomson Reuters for ranking in the top 1% most cited papers. He has won several awards including 'POSCO TJ Award' (2017), 'Knowledge Creation Award from Ministry of Science, ICT, and Future Planning (2016)', 'Korea University Alumni Prize for Best Research (2016)', 'Korean Sensor Society Academic Award (2017)', '100 Future-Leading Technologies and Their Developers, National Academy of Engineering of Korea (2013)', 'Korea University Award for Distinguished Research (2014)' and 'Patent of Year (2001)'. He published 290 peer-reviewed papers and holds 40 domestic and international patents.
Department of Materials Science and Engineering, Korea University,
Anam-Dong, Seongbuk-Gu, Seoul 02841, Republic of Korea
Oxide semiconductor gas sensors have been used to detect explosive, harmful, and dangerous gases because of their high sensitivity, rapid response, and cost effectiveness. Because of simple sensor structure, oxide semiconductors and their array can be integrated within a smart phone or portable device, which will be connected to other devices and systems through Internet of Things and wireless communications. Moreover, the applications of gas sensors are gradually expanded to the monitoring of indoor/outdoor air pollutants, fruit ripening, and fish freshness as well as smart farming and medical diagnosis from exhaled breath. To this end, various new gases should be either detected in a selective manner by oxide semiconductor gas sensors or discriminated by the sensor-array-based electronic nose. To date, various nanostructures with high surface area to volume ratio, such as 0-D nanoparticles, 1-D nanowires, 2-D nanosheets have been explored to enhance the gas response. However, for demand-based design of high performance gas sensors, many issues still remain unsolved, which include the detection of ultralow concentration of analyte gas, highly selective detection of a specific gas, robust gas sensing regardless of humidity variation, and the establishment of sensing library toward diverse analyte gases for artificial olfaction. In this presentation, various new and general strategies to design sensitive, selective, and robust oxide semiconductor gas sensors will be suggested, which include the use of hollow and hierarchical nanostructures with high gas accessibility, microspheres with tri-modal porosity, p-type oxide semiconductors with high catalytic activity, yolk-shell micro-reactors to promote the reforming of inactive gases to more reactive forms, bilayer sensing film consisting of nano-scale catalytic overlayer, and hetero-nanostructures as sensing materials or platforms.
Dr. Xiang Ming Chen is currently a Chair Professor of Materials Science, Director of Institute of Materials Physics in School of Materials Science and Engineering, Zhejiang University, Hangzhou, China.
He graduated from Department of Materials Science and Engineering, Central South University (China) in December 1981, and he was awarded the Doctor Degree in Engineering by The University of Tokyo (Japan) in March 1991. He spent three years to serve as a research engineer at Yokohama R&D Laboratories, Furukawa Electric Co. Ltd. (Japan) before he returned to China to become an Associate Professor at Department of Materials Science and Engineering, Zhejiang University in July 1994. He was promoted Professor at Department of Materials Science and Engineering, Zhejiang University in November 1996.
He is author or co-author for over 400 papers on the peer-reviewed journals such as Nature Commun., Adv. Funct. Mater., J. Am. Ceram. Soc., Phys. Rev. B, Appl. Phys. Lett., Chem. Mater. and so on. He has given more than 70 invited or plenary talks at international conferences. He has 18 Chinese patents and 1 US patent with his name. He is a winner of National Science Foundation for Distinguished Young Scholars, China (2000); and a winner of Okazaki Kiyoshi Award, Japan (2007). He received the title of Professor of Cheung Kong Scholars Programme in 2002. He is a fellow of The American Ceramic Society (2013), and he has served as associate editor of J. Am. Ceram. Soc. since 2007.
His current research interests cover the fields of multiferroic materials, microwave dielectric ceramics, ferroelectric and relaxor ferroelectric materials, as well as dielectric ceramics for energy storage applications.
Xiang Ming Chen
Institute of Materials Physics, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Exploring single phase multiferroic materials has been a long-time-sought quest due to the promise of novel spintronic devices. BiFeO3 has been recognized as the most important room temperature single phase multiferroic material which has a large polarization together with the antiferromagnetism above room temperature. However, the weak magnetoelectric coupling remains as the key issue which obstructs its applications. On the other hand, type-II multiferroics, where the ferroelectricity generally originates from some special magnetic structure, have the serious shortcomings of very weak polarization and a critical temperature much lower than room temperature though a strong magnetoelectric coupling is expected. Therefore, it has been a challenge issue to develop the room temperature single phase multiferroic materials, and the relatively realistic approaches include: i) Enhancing magnetoelectric coupling in BiFeO3-based systems; and ii) Searching the third way to realize the co-presence of ferroelectricity/ ferro-magnetism and strong magnetoelectric coupling.