Preprint Article Version 1 This version is not peer-reviewed

Atomic Surface Segregation and Structural Characterization of PdPt Bimetallic Nanoparticles

Version 1 : Received: 17 August 2018 / Approved: 18 August 2018 / Online: 18 August 2018 (05:59:06 CEST)

How to cite: Rodríguez-Proenza, C.A.; Palomares-Báez, J.P.; Chávez-Rojo, M.A.; García-Ruiz, A.F.; Azanza-Ricardo, C.L.; Santoveña-Uribe, A.; Luna-Bárcenas, G.; Rodríguez-López, J.L.; Esparza, R. Atomic Surface Segregation and Structural Characterization of PdPt Bimetallic Nanoparticles. Preprints 2018, 2018080323 (doi: 10.20944/preprints201808.0323.v1). Rodríguez-Proenza, C.A.; Palomares-Báez, J.P.; Chávez-Rojo, M.A.; García-Ruiz, A.F.; Azanza-Ricardo, C.L.; Santoveña-Uribe, A.; Luna-Bárcenas, G.; Rodríguez-López, J.L.; Esparza, R. Atomic Surface Segregation and Structural Characterization of PdPt Bimetallic Nanoparticles. Preprints 2018, 2018080323 (doi: 10.20944/preprints201808.0323.v1).

Abstract

Bimetallic nanoparticles are of interest since they lead to many interesting electrical, chemical, catalytic, and optical properties. They are particularly important in the field of catalysis since they show superior catalytic properties than their monometallic counterparts. The structures of bimetallic nanoparticles depend mainly on the synthesis conditions and the miscibility of the two components. In this work, PdPt alloyed-bimetallic nanoparticles (NPs) were synthesized through the polyol method, and characterized using spherical aberration (Cs) corrected scanning transmission electron microscopy (STEM). High-angle annular dark-field (HAADF)-STEM images of bimetallic nanoparticles were obtained. The contrast of images shows that nanoparticles have an alloy structure with an average size of 8.2 nm. Together with the characterization of nanoparticles, a systematic molecular dynamics simulations study, focused on the structural stability and atomic surface segregation trends in 923-atom PdPt alloyed-bimetallic NPs was carried out.

Subject Areas

bimetallic nanoparticles; electron microscopy; molecular dynamics simulation; Gupta potential; PdPt alloys; nanostructures

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