This talk will present recent research activities at Tufts University in the area of single chip sensors for chemical sensing. First, an innovative approach termed “CMOS for Nanoassembly (C4NA)” paradigm is presented which seems to be a practical pathway for heterogeneous integration of multiple nanomaterials on the same platform to realize single chip nanosensors. The approach is based on spatially controlled dielectrophoresis (scDEP), which is a low-cost, maskless, electric-field-based directed assembly. The process utilizes CMOS chips as electroactive functional substrates for scDEP of nanomaterials. We will present some preliminary results in utilizing C4NA approach to assemble single walled carbon nanotubes, DNA- functionalized single walled carbon nanotubes, nanowires and graphene for sensing of volatile organic compounds in the environment with potential for breath-based biomedical diagnostics. Second, the talk will introduce CMOS-based electrode arrays utilizing built-in metal layers of the chip as working electrodes for variety of electrochemical sensor applications. Finally, a CMOS based fluorescence lifetime 32 x 32 imager for two dimensional oxygen sensing is presented. The imager is implemented in 65nm CMOS process and showcases a 110ps lifetime resolution. If opportunity permits, synopsis of research efforts at NanoLab at Tufts University will be presented.
Prof. Sameer Sonkusale is as an Associate Dean of Graduate Education for School of Engineering at Tufts University. He is also an Associate Professor of Electrical Engineering at Tufts University. Prior to coming to Tufts, he was an Assistant Professor at Texas A&M University at College Station, Texas from 2002 to 2004. For the year 2011-2012, he was also a visiting associate professor of medicine at Harvard Medical School and Brigham and Women’s Hospital. Prof. Sonkusale received his MS and PhD in Electrical Engineering from University of Pennsylvania. His undergraduate degree is in Electrical and Electronics Engineering from Birla Institute of Technology and Science (BITS Pilani), India. Prof. Sonkusale's teaching and research interests are in the area of nanoscale sensors-on-a-chip, low power integrated circuits, biomedical circuits and systems, and analog to information converters. A recent addition to this list is the area of metamaterials and plasmonics.
Prof. Sonkusale has received the National Science Foundation CAREER award in 2010, the Future Trends in Microelectronics Best paper prize in 2009, and has won several best paper awards with his students at many international conferences (NANO 2008, SENSORS 2008, ISDRS 2009, FTM 2009). Prof. Sonkusale is a past associate editor of IEEE Transactions of Circuits and Systems-1. He is a vice-president of Biomedical and Lifesciences Circuits and Systems Technical Committee and a member of Analog Signal Processing Technical Committee of the IEEE Circuits and Systems Society. He is also on the Technical Program Committees of several conferences such as ISCAS, SENSORS, and EMBC. He is a senior member of the IEEE, OSA, MRS, AAAS and Eta Kappa Nu.