Kim, Se-Ho Jang, Kyuseon Kang, Phil Woong Ahn, Jae-Pyoung Seol, Jae-Bok Kwak, Chang-Min Hatzoglou, Constantinos Vurpillot, Francois Choi, Pyuck-Pa 2024-01-19T17:01:31Z 2024-01-19T17:01:31Z 2022-01-25 2020-08 0925-8388 https://pubs.kist.re.kr/handle/201004/118282 We report on atom probe tomography analyses of Pd and Pd@Au nanoparticles embedded in a Ni matrix and the effects of local evaporation field variations on the atom probe data. In order to assess the integrity of the reconstructed atom maps, we performed numerical simulations of the field evaporation processes and compared the simulated datasets with experimentally acquired data. The distortions seen in the atom maps for both Pd and Pd@Au nanoparticles could be mostly ascribed to local variations in chemical composition and elemental evaporation fields. The evaporation field values for Pd and Ni, taken from the image hump model and assumed in the simulations, yielded a good agreement between experimental and simulation results. In contrast, the evaporation field for Au, as predicted from the image hump model, appeared to be substantially overestimated and resulted in a large discrepancy between experiments and simulations. (C) 2020 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA Characterization of Pd and Pd@Au core-shell nanoparticles using atom probe tomography and field evaporation simulation Article 10.1016/j.jallcom.2020.154721 1 JOURNAL OF ALLOYS AND COMPOUNDS, v.831 JOURNAL OF ALLOYS AND COMPOUNDS 831 N scie scopus 000531727900020 2-s2.0-85082669174 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article OPTICAL-PROPERTIES METAL NANOPARTICLES LOCAL MAGNIFICATION SHAPE NANOCRYSTALS RECONSTRUCTION MICROSCOPY EVOLUTION OXIDATION BEHAVIOR Atom probe tomography Nanoparticles Field evaporation Numerical simulation