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Morphology of Ni (core)/Au (shell) nanoparticles

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Abstract

We obtained sphere-like nanoparticles Ni/Au with a core-shell structure. They are variable in size (7–14 nm of Ni nuclei) and have a narrow-size particle distribution. It was done by means of stepwise (sequential) reduction of the calibrated portions of tetrahydroborate sodium and nickel sulfate solutions. It was done under the presence of sodium citrate as a stabilizer and the combination with a two-step deposition of Au film: (1) electrochemical substitution of Ni0 + Au+3 → Ni+2 + Аu0 and (2) reduction of chloroauric acid by tetrahydroborate sodium. The study of the particles was provided by TEM, XRD, SAXS, CV, ICP OES, and XPS. It significantly allowed to broaden out the existing knowledge on their morphology, phase, and chemical composition. Au shell with averaged 0.6-nm thickness is formed as an irregular polyhedron, composed of polyhedral pieces (scales) with the structure of fcc-type. The shell has pores around the joints of polyhedral pieces. So, Ni nuclei are oxidized under storage of samples at these locations to form nickel hydroxide. The nanophase of solid solution of Au-Ni (rich in gold) is formed on the Ni-Au contact. This is the result of interdiffusion of metals (mainly nickel in gold). Its volume fraction can reach up to 17%. Ni core then contains small amounts of impurities of boron or its compounds.

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Acknowledgements

This research was conducted by the Ministry of Education and Science of the Russian Federation within the framework of state order no. 2014/64, project no. 2384. The research was also supported by project 45.3 of State financing of Science Academies. The authors thank R. S. Islamov for linguistic support of this article and N. K. Eremenko for help with the work.

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Authors and Affiliations

  1. Kemerovo State University, Kemerovo, 650000, Russia

    Yuri A. Zakharov, Valery M. Pugachev, Roman P. Kolmykov, Dmitry M. Russakov, Vadim G. Dodonov, Natalia V. Ivanova & Nicolay N. Ivanov

  2. The Federal Research Center of Coal and Coal Chemistry SB RAS, Kemerovo, 650000, Russia

    Yuri A. Zakharov, Roman P. Kolmykov & Iraida I. Obraztsova

  3. Boreskov Institute of Catalysis SB RAS, Novosibirsk, 630090, Russia

    Igor P. Prosvirin

Authors
  1. Yuri A. Zakharov
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  2. Valery M. Pugachev
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  3. Roman P. Kolmykov
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  4. Dmitry M. Russakov
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  5. Vadim G. Dodonov
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  6. Iraida I. Obraztsova
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  7. Igor P. Prosvirin
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  8. Natalia V. Ivanova
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  9. Nicolay N. Ivanov
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Contributions

The manuscript was written through contributions of all authors: Yu. Z. wrote the article and made the general leadership of the work; V. P. took XRD measurements and wrote the relevant part of the paper; R. K. conducted ICP OES experiments, wrote the corresponding part of the paper, made calculations, and prepared the manuscript and its English version; D. R., I. P., and I. O. carried out the experiments of TEM, XPS, and the synthesis of the investigated objects accordingly; V. D. obtained the data of SAXS and discussed the relevant part of the work; and N. I. and N. I. carried out electrochemical experiments.

All authors have given approval to the final version of the manuscript.

Corresponding author

Correspondence to Roman P. Kolmykov.

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Zakharov, Y.A., Pugachev, V.M., Kolmykov, R.P. et al. Morphology of Ni (core)/Au (shell) nanoparticles. Gold Bull 50, 225–234 (2017). https://doi.org/10.1007/s13404-017-0212-1

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  • DOI: https://doi.org/10.1007/s13404-017-0212-1

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