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Article

Octahedral Growth of PtPd Nanocrystals

1
Dipartimento di Fisica dell’Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
2
Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa) and Physics Department “Aldo Pontremoli”, University of Milan, Via Celoria 16, 20133 Milan, Italy
3
Dipartimento di Fisica dell’Università di Genova and CNR-IMEM, Via Dodecaneso 33, 16146 Genova, Italy
4
Molecular Cryo-Electron Microscopy Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-Son, Kunigami-Gun, Okinawa 904-0495, Japan
*
Authors to whom correspondence should be addressed.
Academic Editors: Maria Chiara Spadaro, Pengyi Tang and Jerome Vernieres
Catalysts 2021, 11(6), 718; https://doi.org/10.3390/catal11060718
Received: 17 May 2021 / Revised: 1 June 2021 / Accepted: 3 June 2021 / Published: 9 June 2021
PtPd nanoparticles are among the most widely studied nanoscale systems, mainly because of their applications as catalysts in chemical reactions. In this work, a combined experimental-theoretical study is presented about the dependence of growth shape of PtPd alloy nanocrystals on their composition. The particles are grown in the gas phase and characterized by STEM-HRTEM. PtPd nanoalloys present a bimodal size distribution. The size of the larger population can be tuned between 3.8 ± 0.4 and 14.1 ± 2.0 nm by controlling the deposition parameters. A strong dependence of the particle shape on the composition is found: Pd-rich nanocrystals present more rounded shapes whereas Pt-rich ones exhibit sharp tips. Molecular dynamics simulations and excess energy calculations show that the growth structures are out of equilibrium. The growth simulations are able to follow the growth shape evolution and growth pathways at the atomic level, reproducing the structures in good agreement with the experimental results. Finally the optical absorption properties are calculated for PtPd nanoalloys of the same shapes and sizes grown in our experiments. View Full-Text
Keywords: nanoalloy; PtPd; molecular dynamics; nanocrystals; growth nanoalloy; PtPd; molecular dynamics; nanocrystals; growth
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MDPI and ACS Style

Nelli, D.; Roncaglia, C.; Ahearn, S.; Di Vece, M.; Ferrando, R.; Minnai, C. Octahedral Growth of PtPd Nanocrystals. Catalysts 2021, 11, 718. https://doi.org/10.3390/catal11060718

AMA Style

Nelli D, Roncaglia C, Ahearn S, Di Vece M, Ferrando R, Minnai C. Octahedral Growth of PtPd Nanocrystals. Catalysts. 2021; 11(6):718. https://doi.org/10.3390/catal11060718

Chicago/Turabian Style

Nelli, Diana, Cesare Roncaglia, Samuel Ahearn, Marcel Di Vece, Riccardo Ferrando, and Chloé Minnai. 2021. "Octahedral Growth of PtPd Nanocrystals" Catalysts 11, no. 6: 718. https://doi.org/10.3390/catal11060718

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