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Article

Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates

1
Shpol’skii Theoretical Physics Chair, Laboratory of Advanced Materials Physics, Moscow Pedagogical State University, 119435 Moscow, Russia
2
Thin Film Growth Laboratories and Inorganic Nanostructures, Center of Crystallography and Photonics of RAS, 119333 Moscow, Russia
3
Laboratory of Chemical Physics of Bioanalytical Processes, N.M. Emanuel Institute of Biochemical Physics RAS, 119334 Moscow, Russia
4
Powerful Electromagnetic Laboratory, Joint Institute for High Temperatures of RAS, 125412 Moscow, Russia
5
Maths Department, Moscow Polytechnic University, 107023 Moscow, Russia
6
Laboratory for Spectroscopy of Electronic Spectra of Molecules, Institute for Spectroscopy RAS, 108840 Moscow Troitsk, Russia
*
Authors to whom correspondence should be addressed.
Academic Editor: Victor M. Burlakov
Appl. Sci. 2021, 11(4), 1375; https://doi.org/10.3390/app11041375
Received: 22 December 2020 / Revised: 24 January 2021 / Accepted: 29 January 2021 / Published: 3 February 2021
(This article belongs to the Special Issue Towards Ideal Nanomaterials)
This paper presents a cost-effective approach for the template-assisted electrodeposition fabrication of substrates for surface-enhanced Raman scattering (SERS) with metal nanowires (NWs) grown in pores of polymer track-etched membranes (TM). This technique allows the synthesis of NWs array with its certain surface density and diameter (from dozen to hundreds of nm). NWs length also may be varied (order of μm) by controlling deposition time. Here we grow vertical Ag-NWs which are leaning towards their nearest neighbors, forming self-assembled bundles whose parameters depend on the NW aspect ratio (length to diameter). We show that in such bundles there are “hot spots” in the nm-gaps between NWs tips. Computer simulations have demonstrated a strong enhancement of the electric field within these hot spots; thus, the Raman signal is markedly amplified for analyte molecules placed directly inside the gaps. We have experimentally proved the potential of this SERS-technique on the example of 4-Mercaptophenylboronic acid (4-MPBA). For 4-MPBA the maximal enhancement of Raman signal was found at NWs length of ~1.6 μm and diameter of ~100 nm. The effect is higher (up to twice) if “wet” substrate is used just immediately after the TM polymer removal so that the tips are brought to lean after analyte exposure. We suggest this new type of nanostructured SERS-substrates as a base of effective sensing of extremely low concentration of analytes. View Full-Text
Keywords: surface-enhanced Raman scattering (SERS); track-etched membranes; template synthesis; nanowires; gap hot spots; substrates; Purcell-effect; single molecule; sensors; metamaterials surface-enhanced Raman scattering (SERS); track-etched membranes; template synthesis; nanowires; gap hot spots; substrates; Purcell-effect; single molecule; sensors; metamaterials
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MDPI and ACS Style

Kozhina, E.P.; Bedin, S.A.; Nechaeva, N.L.; Podoynitsyn, S.N.; Tarakanov, V.P.; Andreev, S.N.; Grigoriev, Y.V.; Naumov, A.V. Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates. Appl. Sci. 2021, 11, 1375. https://doi.org/10.3390/app11041375

AMA Style

Kozhina EP, Bedin SA, Nechaeva NL, Podoynitsyn SN, Tarakanov VP, Andreev SN, Grigoriev YV, Naumov AV. Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates. Applied Sciences. 2021; 11(4):1375. https://doi.org/10.3390/app11041375

Chicago/Turabian Style

Kozhina, Elizaveta P., Sergey A. Bedin, Natalia L. Nechaeva, Sergey N. Podoynitsyn, Vladimir P. Tarakanov, Stepan N. Andreev, Yuriy V. Grigoriev, and Andrey V. Naumov 2021. "Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates" Applied Sciences 11, no. 4: 1375. https://doi.org/10.3390/app11041375

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