Surface-enhanced Raman spectroscopy (SERS) is a promising optical method for analyzing molecular samples of various nature. Most SERS studies are of an applied nature, indicating a serious potential for their application in analytical practice. Dendritelike nanostructures have great potential for SERS, but the lack of a method for their predictable production significantly limits their implementation. In this paper, a method for controllably obtaining spatially separated, self-organized, and highly-branched silver dendrites via template synthesis in pores of SiO2/Si is proposed. The dendritic branches have nanoscale roughness, creating many plasmon-active “hotspots” required for SERS. The first held 3D modeling of the external electromagnetic wave interaction with such a dendrite, as well as experimental data, confirms this theory. Using the example of a reference biological analyte, which is usually used as a label for other biological molecules, the dendrites’ SERS-sensitivity up to 10−15M was demonstrated with an enhancement factor of 108. The comparison of simulation results with SERS experiments allows distinguishing the presence of electromagnetic and chemical contributions, which have a different effect at various analyte concentrations.
Self-organized spatially separated silver 3D dendrites as efficient plasmonic nanostructures for surface-enhanced Raman spectroscopy applications
Dzmitry V. Yakimchuk, Egor Yu Kaniukov, Sergey Lepeshov, Victoria D. Bundyukova, Sergey E. Demyanov, Grigory M. Arzumanyanm, Nelya V. Doroshkevich, Kahramon Z. Mamatkulov, Arne Bochmann, Martin Presselt, Ondrej Stranik, Soslan A. Khubezhov, Aleksander E. Krasnok, Andrea Alù, Vladimir A. Sivakov; Self-organized spatially separated silver 3D dendrites as efficient plasmonic nanostructures for surface-enhanced Raman spectroscopy applications. J. Appl. Phys. 21 December 2019; 126 (23): 233105. https://doi.org/10.1063/1.5129207
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