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Journal of Materials Science

, Volume 53, Issue 11, pp 8161–8169 | Cite as

Flower-like silver nanocrystals: facile synthesis via a gas–solution interface technique

  • Larisa B. Gulina
  • Valeri P. Tolstoy
  • Igor A. Kasatkin
  • Sergey A. Fateev
Chemical routes to materials

Abstract

In this paper, flower-like Ag nanocrystals and their fractal networks were successfully synthesized by gas–solution interface technique at the surface of AgNO3 water solution with the assistance of ammonium citrate and of gaseous N2H4 used as reductant. The synthesized flower-like silver structure consisted of a large number of petal-like silver nanoplates. They were characterized by scanning and transmission electron microscopy, absorption UV–Vis spectroscopy, and X-ray diffraction. In addition to the standard silver fcc modification, the nanostructures contained the hexagonal polymorph (4H-Ag) in the amount of about 5%. The effect of pH of the solution on the morphology of nanoparticles and on the silver crystal structure was examined. Depending on the time of treatment with gaseous hydrazine, it was possible to obtain either separate flower-like nanoparicles and their fractal networks, or continuous films formed by rather closely packed petal-like nanoparticles. The surface-enhanced Raman scattering effect was observed, and the most intense interaction of laser beam with the silver nanoparticles occurred when the solution side of the synthesized film was irradiated.

Notes

Acknowledgements

The study was supported by Russian Foundation for Basic Research (Grant 15-03-08045). The XRD measurements were done at the Resource Centre for X-ray diffraction studies, SPbSU. The SEM, TEM and HRTEM studies were performed at the Nanotechnology Centre, SPbSU. The SERS study was carried out at the Resource Centre for Optical and Laser Materials Research, SPbSU. The authors are thankful to V. Mikhailovskii, D. Danilov, and A. Kireev, St. Petersburg State University, for their helpful assistance in the Ag nanostructure characterization.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. 1.Saint Petersburg State UniversitySt. PetersburgRussia

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