
Geoffrey Rojas (Shelburne)
Research Associate, Characterization Facility- Ph. D. in Physics & Astronomy, University of Nebraska-Lincoln
- M. S. in Physics & Astronomy, University of Nebraska-Lincoln
- B. S. in Physics, Augsburg College
- 2013 - 2015: Postdoctoral Associate, Department of Chemical Engineering & Materials Science, University of Minnesota
- 2011 - 2013: Postdoctoral Associate, Imaging & Characterization User Facility, Oak Ridge National Laboratory
- 2005 - 2011: Research Assistant, Department of Physics & Astronomy, University of Nebraska-Lincoln
Geoff Rojas is a condensed matter physicist with a Ph.D. from the University of Nebraska-Lincoln. His graduate work was followed by a two-year postdoctoral appointment at the Imaging Characterization user facility at Oak Ridge National Laboratory. His research focused on in situ growth and characterization of ultrathin films using a variety of techniques include scanning tunneling microscopy, local probe spectroscopy, x-ray diffraction, and x-ray and ultraviolet photoelectron spectroscopy. He came to the University of Minnesota in 2013 as a postdoctoral associate to study interface chemistry, printing techniques, and scanning force microscopy.
A committed researcher at the University of Minnesota, his interests include the development of multi-dimensional surface probe techniques, nanoscale characterization of mechanical and chemical properties of active biological systems, and the in situ study of functional materials using both local and integral spectroscopy methods.
- Rojas, G. A.; Wu, Y.; Haugstad, G.; Frisbie, C. D. Measuring the Thickness and Potential Profiles of the Space Charge Layer at Organic/organic Interfaces under Illumination and in the Dark by SKPM. ACS Appl. Mater. Interfaces 2016, acsami.6b00367.
- Wu, Y.; Chew, A. R.; Rojas, G. A.; Sini, G.; Haugstad, G.; Belianinov, A.; Kalinin, S. V.; Li, H.; Risko, C.; Brédas, J.-L. Salleo, A.; Frisbie, C. D. Strain Effects on the Work Function of an Organic Semiconductor. Nat. Commun. 2016, 7, 10270.
- Rojas, G. A.; Ganesh, P.; Kelly, S. J.; Sumpter, B. G.; Schlueter, J. A.; Maksymovych, P. Ionic Disproportionation of Charge Transfer Salt Driven by Surface Epitaxy. J. Phys. Chem. C 2013, 117 (38), 19402-19408.
- Rojas, G. A.; Chen, X.; Kunkel, D.; Nitz, J.; Xiao, J.; Dowben, P. A.; Simpson, S.; Zurek, E.; Enders, A. Surface State Engineering of Molecule-Molecule Interactions. Phys. Chem. Chem. Phys. 2011, 14 (14), 4971-4976.
- Chen, X.; Yang, S.; Kim, J.-H.; Kim, H.-D.; Kim, J.-S.; Rojas, G. A.; Skomski, R.; Lu, H.; Bhattacharya, A.; Santos, T.; Guisinger, N.; Bode, M.; Gruverman, A.; Enders, A. Ultrathin BaTiO3 Templates for Multiferroic Nanostructures. New J. Phys. 2011, 13 (8), 083037.
- Rojas, G. A.; Chen, X.; Bravo, C.; Kim, J. H.; Kim, J.-S.; Xiao, J.; Dowben, P. A.; Gao, Y.; Zeng, X. C.; Choe, W.; Enders, A. Self-Assembly and Properties of Nonmetalated Tetraphenyl-Porphyrin on Metal Substrates. J. Phys. Chem. C 2010, 114 (20), 9408-9415.
- Shand, P. M.; Bohnet, J. G.; Goertzen, J.; Shield, J. E.; Schmitter, D.; Shelburne, G. A.; Leslie-Pelecky, D. L. Magnetic Behavior of Melt-Spun Gadolinium. Phys. Rev. B 2008, 77 (18), 1-11.
- Morales, M. A.; Skomski, R.; Fritz, S.; Shelburne, G. A.; Shield, J. E.; Yin, M.; O'Brien, S.; Leslie-Pelecky, D. L. Surface Anisotropy and Magnetic Freezing of MnO Nanoparticles. Phys. Rev. B 2007, 75 (13), 1-5.