CSE PhD student wins Best Student Paper Award at IEEE conference

Jaesung Lee, a PhD student in the Department of Electrical Engineering and Computer Science, has won a Best Student Paper Award at the 2014 Institute of Electrical and Electronics Engineers International Frequency Control Symposium (IEEE IFCS) for presenting his paper entitled “Atomically Thin MoS2 Resonators for Pressure Sensing.”
Lee and his faculty mentor Philip Feng, assistant professor of electrical engineering and computer science, reported an experimental investigation of a new type of nanoscale device that is exceptionally responsive to small pressure variations, and yet can tolerate pressure changes over wide ranges.
The devices are circular drumhead membranes suspended over microscale cavities patterned on a silicon chip. These membranes are derived from molybdenum disulfide (MoS2), a layered semiconducting material that can be transferred onto a substrate to make two-dimensional crystals as thin as just a single or a few atomic layers. Because the 2D membranes are extremely flexible and do not suffer from brittleness, they can operate over a wide pressure range.
With further engineering, the researchers say these devices and the optical techniques used can be integrated into flexible optical fibers, which may lead to ultrasensitive pressure monitoring in harsh environments like inside human body or in drilling and mining applications, where electrical wiring of sensors is often undesirable. 
In previously published research, Lee, Feng and their colleagues demonstrated the world’s first MoS2 2-D nanoresonators, also featured by NanotechWeb and the Royal Society’s ChemistryWorld
IEEE IFCS is an annual forum on frequency control, time standards and sensing technologies, including a wide range of emerging devices such as MEMS and NEMS resonators, integrated electrical oscillators and clocks, microwave frequency standards, and chip-scale atomic clocks. Each paper competition finalist was required to give both a poster presentation in front of a group of judges, and an oral presentation in a session. This work has been supported by Case School of Engineering and the National Academy of Engineering’s Grainger Foundation Frontiers of Engineering (FOE) Award. Part of Lee’s travel support has been generously provided by the IEEE Ultrasonics, Ferroelectrics and Frequency Control (UFFC) Society for student paper competition finalists.