Judith Yang

Department of Chemical and Petroleum Engineering, University of Pittsburgh
Ph.D., Physics, Cornell University, 1993
Summary:

Surface Reactions (oxidation, catalysis) and Electron Microscopy (in situ)

Dealing with oxidation is a major societal priority, yet oxidation also presents a fascinating challenge in thin film growth.  Classical theories of oxidation were based mostly on thermogravimetric analysis (TGA) that only measures weight change, not structural changes.  Hence, classical theories assume a uniform film growth, yet it is well known that oxides do not develop as uniform films.  Recent developments of in situ experimental tools permit visualization of the dynamic processes at the nanoscale.  Yang’s research group uses in situ ultra-high vacuum transmission electron microscopy (UHV-TEM) to improve the fundamental understanding of oxidation; figure 1 are bright field images of Cu and Cu-5%Ni thin films during oxidation at P(O2) 10-4 Torr in situ, where oxide islands are seen to nucleate and grow and their shapes depend sensitively on temperature.  Heteroepitaxial concepts, based on surface diffusion, strain and structural evolution, describe surprisingly well these initial oxidation stages.

Most Cited Publications
  1. “Shape-dependent catalytic properties of Pt nanoparticles,” Simon Mostafa, Farzad Behafarid, Jason R. Croy, Luis K. Ono, Long Li, Judith C. Yang, Anatoly I. Frenkel, and Beatriz Roldan Cuenya, Journal of the American Chemical Society, 132(44), 15714 (2010)
  2. "Highly selective plasma-activated catalysts for carbon dioxide reduction to ethylene," Mistry, H., Varela, A.S., Bonifacio, C.S., (...), Strasser, P., Cuenya, B.R. Nature Communications 7,12123 (2016)
  3. "Self-limiting oxidation of copper,"     Yang, J.C., Kolasa, B., Gibson, J.M., Yeadon, M. Applied Physics Letters 73(19), 2841-2843 (1998)
  4. "Transient oxidation of NiAl,"     Yang, J.C., Schumann, E., Levin, I., Rühle, M. Acta Materialia 46(6), 2195-2201 (1998)
  5. “Sub-nanometer Au monolayer-protected clusters exhibiting molecule-like electronic behavior: quantitative high-angle annular dark-field scanning transmission electron microscopy and electrochemical characterization of clusters with precise atomic stoichiometry,” Laurent D. Menard, Shang-Peng Gao, Huiping Xu, Ray D. Twesten, Amanda S. Harper, Yang Song, Gangli Wang, Alicia D. Douglas, Judith C. Yang, Anatoly I. Frenkel, Ralph G. Nuzzo, and Royce W. Murray, J. Phys. Chem. B 110, 12874 (2006)
Recent Publications
  1. "Anomalous phonon relaxation in Au 333 (SR) 79 nanoparticles with nascent plasmons," T Higaki, M Zhou, G He, S House, MY Sfeir, JC Yang, and R Jin.  Proceedings of the National Academy of Sciences (2019)
  2. "Carbon Supports Enchance the Performance of Ni-Mo Alkaline Hydrogen Evolution Electrocatalysts," R Patil, A Mantri, S House, JC Yang, and JR McKone. ACS (2019)
  3. "Mechanistic Study of Galvanic Replacement of Chemically Heterogeneous Templates,"  Chemistry of Materials 31.4 (2019)
  4. "Structural characterization of heterogeneous RhAu nanoparticles from a microwave-assisted synthesis," Z Duan, J Timeshenko, P Kunal, S House, H Wan, K Jarvis, CS Bonifacio, JC Yang, RM Crooks, AL Frenkel, SM Humphrey, and G Henkelman.  Nanoscale 10.47 (2018)
  5. "Connecting Oxide Nucleation and Growth to Oxygen Diffusion Energetics on Stepped Cu(011) Surfaces: An Experimental and Theoretical Study,"  M Curnan, CM Andolina, M Li, Q Zhu, H Chi, WA Saidi, and JC YangJournal of Physical Chemistry C 123.1 (2018)

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