Professor Lee Wooyoung's Research Team, Cover Article on Angewandte Chemie With the coming of the age of hydrogen energy, Professor Lee Woo-young's research team (Lee Junmin, first Author, graduate student in the Master's program) at Yonsei University's Department of Materials Science and Engineering became the first in the world to develop nanogap-based hydrogen gas sensors that can effectively detect hydrogen gas early on. This technology is based on a simple method of stretching a palladium thin film on an elastomeric substrate to create a nanogap (a nanoscale gap). The technology has been named ‘highly mobile thin film on elastomer (MOTIFE)’ by professor Lee's team. As the stretched palladium absorbs hydrogen, the crack fills up, enabling the MOTIFE sensing method to show on-off behavior. This H2 sensor is highly sensitive and reacts at a very fast speed. The research is expected to cause ripple effects in that it is the first time in which elastomeric substrate is applied to hydrogen sensors. In addition, the technological and commercial applicability of this technology is expected to be very high. This is because the technology, compared to previous one, is low cost and can create nanogaps over large areas. Professor Lee said "This research has shown that it is possible to make high-performance nanogap-based hydrogen sensors that can cover large areas at a low cost." He also noted, "The research result can be used not just for hydrogen sensors but also for biochemical sensors and is applicable to various areas of physics and chemistry." The research was funded by the Convergence Green Energy Original Technology Development Project and the Nano-Bio Innovation Cluster led by the Ministry of Education, Science, and Technology and the National Research Foundation of Korea. The research was recently published as the cover article of the international applied chemistry journal Angewandte Chemie International Edition (IF 11.829) and was chosen as one of its VIPs (Very Important Papers, less than 5%).