Effects of compositional proportions, metal-ion concentration and pH conditions into the structural characteristics of Au, Pt and AuPt nanoparticles

R. Esparza, J.A. Ascencio, R. Pérez, G. Rosas, U. Pal

Abstract


Nanometric metallic particles of Pt, Au and Au/Pt of different nominal
compositions were synthesized using a chemical reduction method with a
polymer (PVP) as the protecting agent. The effects of the gold ion
concentrations and also of the concentration of the reducing agent compound,
on the morphology and structural characteristics of the obtained gold
nanoparticles have been explored. Particles with different pH reaction
mixtures have been synthesized. High resolution transmission electron
microscopy (HRTEM) observations have been used in the nanoparticles
characterization. Depending of the pH reaction mixtures, different
nanometric sizes and consequently different atomic structural configurations
of the particles are obtained. Theoretical simulations based on molecular
dynamics have been used to interpret some of the experimental results and
also to get an insight on macroscopic properties such as: stability and
catalytic activity.

Keywords


Platinum; gold; nanostructures; metallic particles; bimetallic particles; chemical synthesis; characterization; electron microscopy; electronic structure

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REVISTA MEXICANA DE FÍSICA, year 67, issue 1, January-February 2021. Bimonthly Journal published by Sociedad Mexicana de Física, A. C. Departamento de Física, 2º Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Apartado Postal 70-348. Tel. (+52)55-5622-4946, https://rmf.smf.mx/ojs/rmf, e-mail: rmf@ciencias.unam.mx. Chief Editor: José Alejandro Ayala Mercado. INDAUTOR Certificate of Reserve: 04-2019-080216404400-203, ISSN: 2683-2224 (on line), 0035-001X (print), both granted by Instituto Nacional del Derecho de Autor. Responsible for the last update of this issue, Technical Staff of Sociedad Mexicana de Física, A. C., Fís. Efraín Garrido Román, 2º. Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Date of last modification, January 4, 2021.

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