Efficient core-SiO₂/shell-Au nanostructures for surface enhanced Raman scattering

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2014
• Main Authors: Yukhymchuk, V.O., Hreshchuk, O.M., Valakh, M.Ya., Skoryk, M.A., Efanov, V.S., Matveevskaya, N.A.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2014
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/118509
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Efficient core-SiO₂/shell-Au nanostructures for surface enhanced Raman scattering / V.O. Yukhymchuk, O.M. Hreshchuk, M.Ya. Valakh, M.A. Skoryk, V.S. Efanov, N.A. Matveevskaya // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2014. — Т. 17, № 3. — С. 217-221. — Бібліогр.: 14 назв. — англ.

The efficient SERS (surface enhanced Raman scattering) substrates that are
 films of nanoparticles (NP) of the “core–shell” type, where the core of SiO2, and the shell
 of gold nanoparticles, were developed in this work. Application of scanning electron
 microscopy and optical absorption enabled to find correlation between surface
 morphology of nanostructures and position of the plasmon absorption band. It helped to
 adjust the latter to the wavelength of exciting laser radiation. It has been shown that the
 designed nanostructures are able to enhance electric field of an emitting dipole not only
 due to adjustment of the band frequency for plasmon absorption to the wavelength of
 exciting laser radiation but also due to contribution of the so-called “hot spots” to
 enhancement of electric field scattering. Analysis of characteristics inherent to SERS
 substrates with nanostructures of the soil core – Au shell type has shown that they
 enhance the Raman signal by 5 orders higher as compared with the substrates based on
 SiO2 nanospheres not covered with gold nanoparticles.