Self-organized spatially separated silver 3D dendrites as efficient plasmonic nanostructures for Surface-enhanced Raman spectroscopy applications
| Main Authors: | Dzmitry V Yakimchuk, Egor Yu Kaniukov, Sergey Lepeshov, Victoria D Bundyukova, Sergey E Demyanov, Grigory M Arzumanyan, Nelya V Doroshkevich, Kahramon Z Mamatkulov, Arne Bochmann, Martin Presselt, Ondrej Stranik, Soslan A Khubezhov, Alex Krasnok, Andrea Alù, Vladimir A Sivakov |
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| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 2019
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| Online Access: |
https://zenodo.org/record/3697207 |
Daftar Isi:
- 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. Dendrite-like 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 controllable 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 “hot spots” required for SERS. The first held 3D modeling of the external electromagnetic wave interaction with such a dendrite, as well as experimental data, confirm 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 10–15 M was demonstrated with 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.