Tuning the plasmon resonance and SERS properties of silver nanospheres, nanostars and nanotriangles
Vitaly A. Khanadeev,1,2 Andrey V. Simonenko,1,3 Nikolai G. Khlebtsov,1,3
1 Institute of Biochemistry and Physiology of Plants and Microorganisms – Subdivision of the Federal State Budgetary Research Institution Saratov Federal Scientific Centre of the Russian Academy of Sciences (IBPPM RAS), Saratov, Russia;
2 Saratov State Vavilov Agrarian University, Saratov, Russia;
3 Saratov State University, Saratov, Russia;
Abstract
In recent years, the use of plasmon resonance nanoparticles and nanostructures based on them as platforms for SERS has become widespread. Silver nanoparticles occupy a special place among them due to their expressed plasmonic properties. As is known, for the electromagnetic enhancement mechanism of the SERS signal, the presence of roughness, irregularities or spikes on the surface of a nanoparticle is preferable. In this work, using the methods of colloid chemistry, 3 types of silver nanoparticles with different shapes were synthesized: nanospheres, nanotriangles, and nanostars. A comparative study of the enhancement of the SERS signal depending on the shape of the nanoparticles when measured in a colloid was carried out. It was found that the shape of the nanoparticles has a significant effect on the enhancement of the SERS signal. In addition to comparing the SERS properties of nanoparticles of different shapes, we also compared the enhancement of the SERS signal for nanoparticles of the same shape with different spectral positions of the plasmon resonance in the extinction spectrum.
Speaker
Vitaly A. Khanadeev
Institute of Biochemistry and Physiology of Plants and Microorganisms – Subdivision of the Federal State Budgetary Research Institution Saratov Federal Scientific Centre of the Russian Academy of Sciences (IBPPM RAS), Saratov, Russia; Saratov State Vavilo
Russia
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