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Optical properties of plasmonic silver nanoparticles exposed to organic solvents

  • Nikita B. Leonov
  • Sergey G. Przhibel’skii
  • Tigran A. Vartanyan
Article

Abstract

The influence of ethanol and acetic acid on the structure and optical properties of silver granular films formed by physical vapor deposition in a high vacuum on sapphire substrates was studied via optical spectroscopy and scanning electron microscopy. It was found that irregularly shaped oblate silver grains transforms into almost spherical nanoparticles. Simultaneously, optical extinction spectra shift in the short wavelength range and become narrower. The same effect was observed when liquid crystal was poured on such film. It was noticed, that nanoparticle shapes change under the action of these fluids in the same way as in the process of thermal annealing. This analogy suggests that the observed effects could be explained by acceleration of atomic diffusion over the islet surfaces. It was noticed also that the resistance of thick granular films changes abruptly several minutes after pouring such film with ethanol. This jump of resistance is also very similar to the resistance jump observed previously in the case of annealing.

Keywords

Silver nanoparticles Extinction Plasmon resonance Self-diffusion 

Notes

Acknowledgements

This work was supported by Russian Ministry of Education and Science (Project 2014/190) and the Government of Russia (Grant 074-U01). The authors are grateful to V.A. Polishchuk for executing the electron microscopic studies and to A.A. Tsyganenko for useful discussions and comments.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Nikita B. Leonov
    • 1
  • Sergey G. Przhibel’skii
    • 1
  • Tigran A. Vartanyan
    • 1
  1. 1.St. Petersburg National Research University of Information Technologies, Mechanics and OpticsSt. PetersburgRussia

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