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Keywords = surface-enhanced Raman scattering (SERS), track-etched membranes

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13 pages, 1982 KiB  
Article
Detection of Polynitro Compounds at Low Concentrations by SERS Using Ni@Au Nanotubes
by Alena Shumskaya, Elizaveta Kozhina, Sergey Bedin, Stepan Andreev, Ekaterina Kulesh, Alexander Rogachev, Maxim Yarmolenko, Ilya Korolkov, Artem Kozlovskiy, Maksim Zdorovets, Viktor Belyaev, Valeriya Rodionova and Larissa Panina
Chemosensors 2022, 10(8), 306; https://doi.org/10.3390/chemosensors10080306 - 2 Aug 2022
Cited by 6 | Viewed by 2132
Abstract
The identification of high-energy compounds in trace concentrations not only in the laboratory, but also in field conditions is of particular interest. The process should be clear, easy, and well-recognizable. We formed SERS-active substrates by using elongated nickel nanotubes synthesized by electrochemical deposition [...] Read more.
The identification of high-energy compounds in trace concentrations not only in the laboratory, but also in field conditions is of particular interest. The process should be clear, easy, and well-recognizable. We formed SERS-active substrates by using elongated nickel nanotubes synthesized by electrochemical deposition in the pores of ion-track membranes and coated them with gold for further application in the detection of low concentrations of analytes. The substrates were characterized using various techniques to determine the morphology of the nanotubes and modifying gold layer. The possibility of obtaining two types of gold-layer morphology was shown: in the form of a smooth film up to 20–50 nm thick and a coating with nanoneedles up to 250 nm long. The electric fields around the nanotubes were simulated at a laser wavelength of 532 nm to demonstrate the influence of the gold-layer morphology on the field distribution. The “needle” morphology was chosen to form the most effective SERS-active substrates for detection of low concentrations of aromatic polynitro compounds. The spectral peaks were identified by comparing the model and experimental Raman spectra at concentrations down to 10−5 M. Within this limit, all peaks (“fingerprints” of the substance) were clearly distinguishable. Full article
(This article belongs to the Special Issue Innovative Materials, Technologies, and Sensors)
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13 pages, 5064 KiB  
Article
Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates
by Elizaveta P. Kozhina, Sergey A. Bedin, Natalia L. Nechaeva, Sergey N. Podoynitsyn, Vladimir P. Tarakanov, Stepan N. Andreev, Yuriy V. Grigoriev and Andrey V. Naumov
Appl. Sci. 2021, 11(4), 1375; https://doi.org/10.3390/app11041375 - 3 Feb 2021
Cited by 44 | Viewed by 5751
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Towards Ideal Nanomaterials)
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