报告题目：Cross-Reactive Chemical Sensors and Smart Electronics
Discriminating similar molecules remains a very challenging problem for semiconductor gas sensors. We report a method to achieve precise gas discrimination of similar chemical vapors (e.g., mesitylene, o-xylene, and toluene) by using cross-reactive arrays consisting of metal oxide semiconductor and graphene sensors. Usually it is difficult to identify the similar organic chemicals as the conventional sensors have very similar responses to these chemicals. Through a cross-reactive Principal Component Analysis (PCA) of the sensor response features, however, the discrimination accuracy improved from about 70% with a single gas sensor to almost 100% with the cross-reactive sensor array. Such a precise discrimination and the low-cost planar process make this approach a very attractive candidate for smart gas sensing and for future Internet of Things (IoT) applications. In addition, the activities on smart electronics and small systems equipped with these sensors will be presented, with a focus on the education of undergraduate students in nanoelectronics.
Qiliang Li received Ph.D. (2004) in Electrical and Computer Engineering from North Carolina State University. He received M.S. (1999), Nanjing Univ., and B.S. (1996), Wuhan Univ., both in Physics. His doctoral research was in the area of hybrid silicon/molecular field effect transistors and memories. From 2004 to 2007, he served as a scientist in the Semiconductor Electronics Division of National Institute of Standards and Technology (NIST), Gaithersburg, MD, where he worked on the advanced CMOS and nanoelectronics materials and devices. In August 2007, he joined the Department of Electrical and Computer Engineering at George Mason University, Fairfax, VA as an Assistant Professor and was promoted to Associate Professor in 2012 and Professor in 2017. He has published 120 technical papers. He is currently an IEEE senior member. He received the honor of Distinguished Virginia Microelectronics Consortium Professorship in 2007. He received NSF CAREER award in 2009, Mason Emerging Researcher/Scholar/Creator Award in 2011, and School of Engineering Rising Star in 2012.