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John Marohn

Chemistry and Chemical Biology

John Marohn earned a B.S. in Chemistry and a B.A. in Physics from the University of Rochester (Rochester, New York), carried out his Ph.D. work with Daniel P. Weitekamp in the Division of Chemistry and Chemical Engineering at the California Institute of Technology (Pasadena, California), and did postdoctoral work as a U.S. National Research Council Postdoctoral Associate of the U.S. Army Research Laboratory (Adelphi, Maryland).

John joined the Cornell faculty in 1999 and was promoted to Associate Professor in 2005. He is a member of the Cornell Center for Nanoscale Systems, the Cornell Center for Materials Research, and the Kavli Institute at Cornell for Nanoscale Science; he presently serves on the Executive Committees of the Cornell Center for Materials Research and the Cornell NanoScale Science and Technology Facility. Marohn has organized to and chaired two International Kavli Conferences on the topic of Routes to Three-Dimensional Imaging of Single Molecules.


The are two major thrusts to the Marohn group's research. The first, is understanding circuits and solar cells that are made from plastics. Here we use custom-built scanned probe microscopes to record 100 nm resolution maps of electrostatic potential, capacitance, photo-generation of charge, and electric field fluctuations in working organic devices. The second thrust of the group's research is developing approaches for imaging single molecules such as, for example, an individual membrane protein. Here the approach is to push magnetic resonance imaging to nanometer resolution by detecting magnetic resonance mechanically, using tiny silicon cantilevers.