Gas-induced segregation in Pt-Rh alloy nanoparticles observed by in-situ Bragg coherent diffraction imaging
Tomoya Kawaguchi, Thomas F. Keller, Henning Runge, Luca Gelisio, Christoph Seitz, Young Y. Kim, Evan R. Maxey, Wonsuk Cha, Andrew Ulvestad, Stephan O. Hruszkewy… 展开作者
Tomoya Kawaguchi, Thomas F. Keller, Henning Runge, Luca Gelisio, Christoph Seitz, Young Y. Kim, Evan R. Maxey, Wonsuk Cha, Andrew Ulvestad, Stephan O. Hruszkewycz, Ross Harder, Ivan A. Vartanyants, Andreas Stierle, Hoydoo You
Bimetallic catalysts can undergo segregation or redistribution of the metals driven by oxidizing and reducing environments. Bragg coherent diffraction imaging (BCDI) was used to relate displacement fields to compositional distributions in crystalline Pt-Rh alloy nanoparticles. 3D images of internal composition showed that the radial distribution of compositions reverses partially between the surface shell and the core when gas flow changes between O2 and H2. Our observation suggests that the elemental segregation of nanoparticle catalysts should be highly active during heterogeneous catalysis and can be a controlling factor in synthesis of electrocatalysts. In addition, our study exemplifies applications of BCDI for in situ 3D imaging of internal equilibrium compositions in other bimetallic alloy nanoparticles.
Morphological evolution of an Au crystalline domain in a nano-particle investigated by Bragg coherent diffraction imaging
Gwangju Institute of Science and Technology（光州科学技术院）；Advanced Photon Source, Argonne National Laboratory（阿贡国家实验室先进光子源）；Chosun University（朝鲜大学）；European XFEL（欧洲自由电子激光设施）
Structure-Dependent Chemical Order Modification in Strained Alloy Nanoparticles
Guangdong Technion – Israel Institute of Technology（广东以色列理工学院）；Universidad de Castilla-La Mancha（卡斯蒂利亚-拉曼恰大学）；Aristotle University of Thessaloniki（塞萨洛尼基亚里士多德大学）
Nanoscale Phase Distribution Governs Exchange Bias in Multiphase Magnetic Nanoparticles
Ecole Centrale School of Engineering, Mahindra University（印度马欣德拉大学埃科尔中央工程学院）；School of Physics, Department of Condensed Matter and Materials Physics, Aristotle University of Thessaloniki（希腊塞萨洛尼基亚里士多德大学凝聚态与材料物理系物理学院）；Center for Interdisciplinary Research and Innovation, Aristotle University of Thessaloniki（希腊塞萨洛尼基亚里士多德大学跨学科研究与创新中心）；Department of Physics, Jai Prakash University（印度贾伊·普拉萨克大学物理系）；Department of Applied Physics, KTH Royal Institute of Technology（瑞典皇家理工学院应用物理系）
