Unique Thermal Property Measurement and Development of Ultra-fast and Highly Sensitive Sensors from Two-Dimensional Materials
Speaker
Jae Hun Seol
Gwangju Institute of Science and Technology
Host
Daniela Rus
MIT SCC & CSAIL
Abstract:
Since the successful exfoliation of graphene from graphite, two-dimensional (2D) materials have garnered significant interest due to their exceptional properties and unique behaviors resulting from their reduced dimensionality. For example, graphene exhibits thermal conductivity comparable to that of diamond at room temperature, representing one of the highest values for any known material. Moreover, intriguing thermal transport phenomena, such as phonon hydrodynamics, have been both predicted and experimentally observed in 2D materials like graphite.
In the first part of this talk, I will present the development of MEMS sensors based on transition metal dichalcogenides (TMDs), which exhibit high temperature coefficients of resistance (TCR). These MEMS-based infrared and gas sensors promise significant improvements in speed and sensitivity compared to current state-of-the-art devices. The second part will focus on the observation of second sound in graphite, a distinctive signature of phonon hydrodynamic transport, which is observed over a wider temperature range in layered materials such as graphite and graphene. Additionally, the ballistic behavior of phonons in graphite will also be discussed.
Brief Bio:
Prof. Jae Hun Seol earned his bachelor's and master's degrees in Mechanical and Aerospace Engineering from Seoul National University in Korea. He then gained industry experience as a refrigerant cycle engineer at Samsung Electronics for two years. Following this, he pursued a Ph.D. in Mechanical Engineering at the University of Texas at Austin. After completing his doctoral studies, he held postdoctoral positions at both the University of Texas at Austin and the University of California, Berkeley, for three years. Since 2013, he has been a faculty member at the Gwangju Institute of Science and Technology (GIST) and serves on the board of the Korean Society of Mechanical Engineers (KSME). His research interests focus on heat transfer at micro- and nano-scales, as well as the development of MEMS sensors.
Since the successful exfoliation of graphene from graphite, two-dimensional (2D) materials have garnered significant interest due to their exceptional properties and unique behaviors resulting from their reduced dimensionality. For example, graphene exhibits thermal conductivity comparable to that of diamond at room temperature, representing one of the highest values for any known material. Moreover, intriguing thermal transport phenomena, such as phonon hydrodynamics, have been both predicted and experimentally observed in 2D materials like graphite.
In the first part of this talk, I will present the development of MEMS sensors based on transition metal dichalcogenides (TMDs), which exhibit high temperature coefficients of resistance (TCR). These MEMS-based infrared and gas sensors promise significant improvements in speed and sensitivity compared to current state-of-the-art devices. The second part will focus on the observation of second sound in graphite, a distinctive signature of phonon hydrodynamic transport, which is observed over a wider temperature range in layered materials such as graphite and graphene. Additionally, the ballistic behavior of phonons in graphite will also be discussed.
Brief Bio:
Prof. Jae Hun Seol earned his bachelor's and master's degrees in Mechanical and Aerospace Engineering from Seoul National University in Korea. He then gained industry experience as a refrigerant cycle engineer at Samsung Electronics for two years. Following this, he pursued a Ph.D. in Mechanical Engineering at the University of Texas at Austin. After completing his doctoral studies, he held postdoctoral positions at both the University of Texas at Austin and the University of California, Berkeley, for three years. Since 2013, he has been a faculty member at the Gwangju Institute of Science and Technology (GIST) and serves on the board of the Korean Society of Mechanical Engineers (KSME). His research interests focus on heat transfer at micro- and nano-scales, as well as the development of MEMS sensors.