Publications
| 2024 (2) | 2023 (5) | 2022 (3) | 2021 (5) |
| 2020 (3) | 2019 (12) | 2018 (5) | 2017 (3) |
| 2016 (4) | 2015 (2) | 2014 (4) | 2013 (7) |
| 2012 (7) | 2011 (1) | 2010 (2) | 2008 (1) |
2015 | Articles and Reviews
Thermal Stability of Core-Shell Nanoparticles: A Combined in Situ Study by XPS and TEM
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In situ techniques of transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were used to investigate the thermal stability of Ni-Co core-shell nanoparticles. The morphological, structural, and chemical changes involved in the core-shell reconfiguration were studied during in situ annealing through simultaneous imaging and acquisition of elemental maps in the TEM, and acquisition of O 1s, Ni 3p, and Co 3p XP spectra. |
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C. S. Bonifacio, S. Carenco, C. H. Wu, S. D. House, H. Bluhm, J. C. Yang. Chem. Mater. 2015, 27 (20), 6960–6968. |
Synthesis and Structural Evolution of Nickel-Cobalt Nanoparticles Under H2 and CO2
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CO2 can be converted into hydrocarbon using cobalt-based catalysts. However and to our surprise, core-shell nickel-cobalt nanoparticles produced oxygenated molecules instead (CO, methanol, formaldehyde). We showed that, as a result of the heating and the presence of reactive gas, nickel was able to migrate to the surface of the nanoparticle. Alongside, small amounts of phosphorus were also found to get exposed to the surface. This phosphorus actually comes from the ligands (TOP) that were required in the first step of the nanoparticles synthesis but partially decomposed upon heating. The active catalyst should not be seen as a cobalt surface, but rather as a nickel-cobalt alloy containing significant level of phosphide species. |
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S. Carenco, C.-H. Wu, A. Shavorskiy, S. Alayoglu, G. A. Somorjai, H. Bluhm, M. Salmeron, Small 2015, 11, 3045 |
