Professor

BS, physics and mathematics, 1973 State University of New York at Brockport

PhD, physics, 1982 State University of New York at Albany

Contact Info

 

 

X-ray scattering and spectroscopy of interface structures

                    We develop novel X-ray probes for atomic-scale characterization of surfaces, interfaces, ultra-thin-films and nanostructures. In addition to using an in-house X-ray lab, we make extensive use of synchrotron X-ray facilities, where there is greatly enhanced chemical and structural sensitivity for studying systems as dilute as one-hundredth of an atomic monolayer. We employ various conventional X-ray scattering and spectroscopy techniques, and have developed a number of novel methods for generating X-ray standing waves with differing characteristic length scales. These periodic X-ray probes are used to pinpoint the lattice location of adsorbate atoms on crystalline surfaces, to measure strain within epitaxially grown semiconductor and ferroelectric thin films, to locate heavy atoms within ordered ultrathin organic films, and to study polyion adsorption at charged liquid/solid interfaces.

Professor Bedzyk's Research Group

Associations and Awards

Fellow, American Physical Society, 1998

Bertram Eugene Warren Diffraction Physics Award, American

Crystallographic Association, 1994

Co-Director of the Synchrotron Research Center at NU

Management Board for DuPont-Northwestern-Dow- Collaborative

Access Team (DND-CAT) at the Advanced Photon Source

Director of the X-ray Diffraction Facility at NU

Visiting research scientist, Argonne National Laboratory

Professor of Physics and Astronomy (Joint Courtesy Appointment)

 

Selected Recent Publications

"The Controlled Evolution of a Polymer Single Crystal”, X. Liu, Y. Zhang, D. K. Goswami, J.S. Okasinski, K. Salaita, P. Sun, M.J. Bedzyk, C.A. Mirkin, Science 307, 1763-1766 (2005).

“X-ray standing wave investigation of submonolayer barium and strontium surface phases on Si(001)”, D.M. Goodner, D.L. Marasco, A.A. Escuadro, L. Cao, M.J. Bedzyk, Phys Rev B 71, 165426 (2005).

“Direct Observation of Cations and Polynucleotides Explains Polyion Adsorption to Like-Charged Surfaces”, J.A. Libera, H. Cheng, M.J. Bedzyk, M. Olvera de la Cruz, M.J. Bedzyk, J. Phys. Chem. B 109, 23001-23007 (2005).

“Imaging of atomic layer deposited (ALD) tungsten monolayers on a-TiO2(110) by X-ray standing wave Fourier inversion”, C.-Y. Kim, J.W. Elam, M.J. Pellin, D.K. Goswami, S.T. Christensen, M.C. Hersam, P.C. Stair, M.J. Bedzyk, J. Phys. Chem. B 110, 12616 – 12620 (2006).

“Zn2+ and Sr2+ adsorption at the TiO2 (110)-electrolyte interface: Influence of ionic strength, coverage, and anions”, Z. Zhang, , P. Fenter, L. Cheng, N.C. Sturchio, M.J. Bedzyk, M.L. Machesky, L.M. Anovitz, D.J. Wesolowski, J. Coll. Interf. Sci. 295, 50-64 (2006).

“Structural Characterization of 4-Bromostyrene Self-Assembled Monolayers on Si(111)”, R. Basu, J.–C. Lin, C.-Y. Kim, M.J. Schmitz, N.L. Yoder, J.A. Kellar, M.J. Bedzyk, M.C. Hersam,  Langmuir 23, 1905-1911 (2007).

“Atomic-Scale View of Redox-Induced Reversible Changes to a Metal-Oxide Catalytic Surface: VOx / a-Fe2O3 (0001)”, C.-Y.  Kim, A. A. Escuadro, P. C. Stair, M. J. Bedzyk, J. Phys. Chem. C 111, 1874-1877 (2007).