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Theoretical and Experimental Study of Optical Response of Bimetallic Platinum and Gold Nanoparticles: Nanoalloys and Core/Shell Configurations

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Abstract

In this research, a theoretical and experimental study of bimetallic gold and platinum nanoparticles is reported. From the green synthesis approach, a combination of rongalite with sucrose is used as a reducing and stabilizing agent. Nanoalloys (Au@Pt) and Pt-core/Au-shell nanoparticles were obtained according to the synthesis process used, and the optical response was analyzed. For nanoalloys, two absorption bands were associated with localized surface plasmon resonances. These were located at 300 nm and another between 350 nm and 365 nm, respectively. For core/shell type nanoparticles, an absorption band centered at 530 nm was observed. The images obtained by transmission electronic microscopy (TEM) confirmed the presence of quasi-spherical nanoparticles with core/shell type configurations. Numerical calculations of the cross sections for a Pt-core/Au-shell nanoparticle with spherical geometry was used to establish a comparison with the experimental absorption in the ultraviolet-visible (UV–Vis) spectrum. Complementary, the TEM images and chemical analysis by energy dispersive spectroscopy (EDS) showed the presence of core/shell type nanoparticles.

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Acknowledgments

The author O. Rocha-Rocha acknowledges support from CONACYT scholarships. The author M. Cortez-Valadez acknowledges support Project A1-S-46242 of the CONACYT Basic Science.

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Authors and Affiliations

  1. Departamento de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Sonora, México

    O. Rocha-Rocha, R. García-Llamas, G. Calderón-Ayala & M. Flores-Acosta

  2. Grupo de Espectroscopía Óptica y Láser, Departamento de Física, Universidad Popular del Cesar, Apdo Postal 200001, Sabanas Diagonal 21 No. 29-56 Sabanas del Valle, Valledupar, Cesar, Colombia

    O. Rocha-Rocha

  3. CONACYT - Departamento de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Sonora, México

    M. Cortez-Valadez

  4. Universidad Estatal de Sonora, Rosales No. 189 Col. Centro, 83100, Hermosillo, México

    G. Calderón-Ayala

  5. Departamento de Física y Matemáticas, Instituto de Ingeniería y Tecnología, Universidad Autónoma de Ciudad Juárez, Ave. Del Charro 450, 32310, Cd. Juárez, Chihuahua, México

    P. G. Maní-González

Authors
  1. O. Rocha-Rocha
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  2. M. Cortez-Valadez
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  3. R. García-Llamas
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  4. G. Calderón-Ayala
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  5. P. G. Maní-González
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  6. M. Flores-Acosta
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Correspondence to O. Rocha-Rocha.

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Rocha-Rocha, O., Cortez-Valadez, M., García-Llamas, R. et al. Theoretical and Experimental Study of Optical Response of Bimetallic Platinum and Gold Nanoparticles: Nanoalloys and Core/Shell Configurations. Journal of Elec Materi 50, 4850–4857 (2021). https://doi.org/10.1007/s11664-021-09033-0

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  • DOI: https://doi.org/10.1007/s11664-021-09033-0

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