Judith Yang

Phone: 
 | Department
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. "Formation of Quasi-One-Dimensional Cu2O Structures by in situOxidation of Cu(100)," Guangwen Zhou and Judith C. Yang, Phys. Rev. Lett. 89, 106101, (2002)
  3. “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)
  4. "Preparation of TiO2-supported Au nanoparticle catalysts from a Au13 cluster precursor: Ligand removal using ozone exposure versus a rapid thermal treatment,"Laurent D. MenardFengting XuRalph G. NuzzoJudith C.YangJournal of Catalysis 243, 64 (2006)
  5. "Temperature effect on the Cu2O oxide morphology created by oxidation of Cu(0 0 1) as investigated by in situ UHV TEM," Guangwen Zhou, Judith C Yang, Applied Surface Science, 210, 165 (2003)
Recent Publications: 
  1. "Dislocation nucleation facilitated by atomic segregation," Lianfeng Zou, Chaoming Yang, Yinkai Lei, Dmitri Zakharov, Jörg M. K. Wiezorek, Dong Su, Qiyue Yin, Jonathan Li, Zhenyu Liu, Eric A. Stach, Judith C. Yang, Liang Qi, Guofeng Wang and Guangwen Zhou, Nature Metarials (2017)
  2. "Enhanced Carbon Dioxide Electroreduction to Carbon Monoxide over Defect-Rich Plasma-Activated Silver Catalysts" Hemma Mistry, Yong-Wook Choi, Alexander Bagger, Fabian Scholten, Cecile S. Bonifacio, Ilya Sinev, Nuria J. Divins, Ioannis Zegkinoglou, Hyo Sang Jeon, Kim Kisslinger, Eric A. Stach, Judith C. Yang, Jan Rossmeisl, and Beatriz Roldan Cuenya, Angew Chem, 38, 1521 (2017)
  3. "Atomically Precise Gold Nanoclusters Accelerate Hydrogen Evolution over MoS2 Nanosheets: The Dual Interfacial Effect", Shuo Zhao, Renxi Jin, Yongbo Song, Hui Zhang, Stephen D. House, Judith C. Yang, and Rongchao Jin, Small, 1613 (2017)
  4. "High-throughput, semi-automated quantitative STEM mass measurement of supported metal nanoparticles using a conventional TEM/STEM", Stephen D. Housea, Yuxiang Chenb, Rongchao Jinb, Judith C. Yang, Ultramicroscopy, 182, 145 (2017)
  5. "Comparison of Spinel and Monoclinic Crystal Structures of γ-Al2O3 for Simulation of Electron Energy Loss Spectra," Henry O. Ayoola, Cecile S. Bonifacio, Qing Zhu, Dong Su, Joshua Kas, John J. Rehr, Eric A. Stach , Wissam A. Saidi , and Judith C. Yang Microscopy and Microanalysis 23, 2020 (2017)

More Members