Carleen Bowers

Formation of Nanostructured SAMs and the Influence of Molecular Structure on Charge Transport

Location: EB1 Room 1011

Friday, March 4th 2016 - 11:00 am

The formation of organic-inorganic interfaces and the understanding of charge transport across such interfaces is important for applications ranging from sensors to electronics. This presentation discusses the development of bi-layered molecular systems that, in conjunction with an inkless, catalytic microcontact printing method, can be used to replicate accurately micro- and nano-scale patterns bearing chemically distinct reactive functionalities on semiconducting substrates. This surface modification and nanofabrication technique was used to spatially pattern organic monolayers on silicon, germanium, and indium tin oxide. In order to assess the mechanisms of charge transport across organic thin films, and to relate the structure of the organic groups with the rate of charge transfer, we utilized an electrical junction having Ga2O3/EGaIn as the liquid metal top electrode. Using this electrical junction, we demonstrate how structural and electronic modifications to the organic thin film affect the shape of the tunneling barrier and influence overall rates of charge transport.

Dr. Bowers received a B.S. in Chemistry from the University of Virginia in 2007 and a Ph.D. in Chemistry in 2012 from Duke University (with Professor Eric Toone). Her doctoral research focused on the development of surface functionalization and soft-lithographic patterning techniques on semiconductor substrates; the aim was to form stable, yet functional inorganic-organic interfaces that could be patterned with polymeric stamps having nanometer-size features. She continued her training as a Postdoctoral Fellow in the Department of Chemistry and Chemical Biology at Harvard University with Professor George M. Whitesides in the area of molecular electronics; here she investigated mechanisms of charge transport across organic thin films using a metal-molecule-metal junction that employs eutectic gallium indium alloy as the liquid metal top-electrode. Dr. Bowers joined NanoSonic in 2015 and has been working on high performance nanocomposite materials for emerging technologies in DoD related platforms.

North Carolina State University