Three-dimensional atomic mapping of ligands on palladium nanoparticles by atom probe tomography
- 주제(기타) Multidisciplinary Sciences
- 설명문(일반) [Jang, Kyuseon; Kim, Se-Ho; Jun, Hosun; Jung, Chanwon; Choi, Pyuck-Pa] Korea Adv Inst Sci & Technol KAIST, Dept Mat Sci & Engn, Daejeon, South Korea; [Kim, Se-Ho] Max Planck Inst Eisenforsch GmbH, Dept Microstruct Phys & Alloy Design, Dusseldorf, Germany; [Yu, Jiwon; Lee, Sangheon] Ewha Womans Univ, Dept Chem Engn & Mat Sci, Seoul, South Korea; [Lee, Sangheon] Ewha Womans Univ, Grad Program Syst Hlth Sci & Engn, Seoul, South Korea
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 NATURE RESEARCH
- 발행년도 2021
- URI http://www.dcollection.net/handler/ewha/000000182340
- 본문언어 영어
- Published As http://dx.doi.org/10.1038/s41467-021-24620-9
초록/요약
Capping ligands are crucial to synthesizing colloidal nanoparticles with functional properties. However, the synergistic effect between different ligands and their distribution on crystallographic surfaces of nanoparticles during colloidal synthesis is still unclear despite powerful spectroscopic techniques, due to a lack of direct imaging techniques. In this study, atom probe tomography is adopted to investigate the three-dimensional atomic-scale distribution of two of the most common types of these ligands, cetrimonium (C19H42N) and halide (Br and Cl) ions, on Pd nanoparticles. The results, validated using density functional theory, demonstrate that the Br anions adsorbed on the nanoparticle surfaces promote the adsorption of the cetrimonium cations through electrostatic interactions, stabilizing the Pd {111} facets. In contrast, the Cl anions are not strongly adsorbed onto the Pd surfaces. The high density of adsorbed cetrimonium cations for Br anion additions results in the formation of multiple-twinned nanoparticles with superior oxidation resistance. Despite the important role of ligands in designing nanoparticles, directly imaging them on the nanoparticle surface remains a challenge. Here, the authors use atom probe tomography to map the spatial distribution of ligands on nanoparticles and reveal that the interplay between halide and cetrimonium ligands decides the oxidation resistance and shape of Pd nanoparticles.
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