Kim, Se-Ho Kang, Phil Woong Park, O. Ok Seol, Jae-Bok Ahn, Jae-Pyoung Lee, Ji Yeong Choi, Pyuck-Pa 2024-01-19T22:31:16Z 2024-01-19T22:31:16Z 2021-09-03 2018-07 0304-3991 https://pubs.kist.re.kr/handle/201004/121209 We present a new method of preparing needle-shaped specimens for atom probe tomography from freestanding Pd and C-supported Pt nanoparticles. The method consists of two steps, namely electrophoresis of nanoparticles on a flat Cu substrate followed by electrodeposition of a Ni film acting as an embedding matrix for the nanoparticles. Atom probe specimen preparation can be subsequently carried out by means of focused-ion-beam milling. Using this approach, we have been able to perform correlative atom probe tomography and transmission electron microscopy analyses on both nanoparticle systems. Reliable mass spectra and three-dimensional atom maps could be obtained for Pd nanoparticle specimens. In contrast, atom probe samples prepared from C- supported Pt nanoparticles showed uneven field evaporation and hence artifacts in the reconstructed atom maps. Our developed method is a viable means of mapping the three-dimensional atomic distribution within nanoparticles and is expected to contribute to an improved understanding of the structure-composition-property relationships of various nanoparticle systems. (C) 2018 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV OXIDE NANOPARTICLES UNDERPOTENTIAL DEPOSITION PALLADIUM NANOPARTICLES CATALYTIC-PROPERTIES METAL NANOPARTICLES LOCAL MAGNIFICATION DOPANT DISTRIBUTION PD NANOCRYSTALS LATTICE-STRAIN DRUG-DELIVERY A new method for mapping the three-dimensional atomic distribution within nanoparticles by atom probe tomography (APT) Article 10.1016/j.ultramic.2018.04.005 1 ULTRAMICROSCOPY, v.190, pp.30 - 38 ULTRAMICROSCOPY 190 30 38 scie scopus 000432868800004 2-s2.0-85045539853 Microscopy Microscopy Article OXIDE NANOPARTICLES UNDERPOTENTIAL DEPOSITION PALLADIUM NANOPARTICLES CATALYTIC-PROPERTIES METAL NANOPARTICLES LOCAL MAGNIFICATION DOPANT DISTRIBUTION PD NANOCRYSTALS LATTICE-STRAIN DRUG-DELIVERY Atom probe tomography Electrophoresis Electroplating Nanoparticles