Two-Dimensional Materials: Science and Applications
A. T. Charlie Johnson
Professor of Physics and Astronomy, Director, Nano/Bio Interface Center
University of Pennsylvania
Two-dimensional materials (sometimes called “atomic layer materials”) have emerged as a scientific playground for the exploration of new phenomena, with numerous potential applications already demonstrated and proposed. I will discuss my group’s work on large-area growth methods for monolayer carbon (graphene), its structural analog boron nitride, and the rich materials family known as transition metal dichalcogenides (TMDs). Along with the basic science of the materials, we have explored all-electronic chemical detectors based on bio-nano hybrids, where a biomolecule provides chemical recognition and a graphene or monolayer molybdenum disulfide (MoS2) transistor enables electronic readout. Capitalizing on rapid advances in 2D materials research and biomolecular engineering, this sensor class represents a promising approach towards sensitive and selective detection of liquid- and vapor-phase anayltes. Such bio-nano hybrids enable detection of protein cancer biomarkers, antigen from various pathogens, and small molecule targets at concentrations ~ 1 pg/mL. More recently we have demonstrated detection of single-stranded DNA hybridization at a concentration of 1 fM. Related methods can be used to create all-electronic vapor sensors that are able to discriminate between highly similar compounds such as enantiomers and very similar complex vapor mixtures characteristic of humans. Recently we have shown the promise of this system for diagnosis of disease based on volatile biomarkers. The work was supported by the National Science Foundation, Lockheed Martin, the Air Force Research Laboratory, Intel, and DARPA.
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Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:10 PM in Lewis Lab room 316. Refreshments and snacks are available in the nearby coffee room at 3:45 PM.
Physics Colloquium Schedule for FALL 2016
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Department of Physics | Lewis Lab | 16 Memorial Drive East | Bethlehem, PA 18015 | phone 610-758-3930