Development of SERS-active silver nanowire filter foils for pathogen detection in fluids

Download

10453502.pdf

Date

2022-2

Author

Oğuz, Hilal

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

8629
views

324
downloads

In this study, the signal enhancement in the vicinity of metal nanowires was investigated by using a specific spectroscopic technique called surface-enhanced Raman scattering (SERS). When laser light interacts with roughened or nanostructured metallic surfaces, the interaction causes an increase in electromagnetic field in Raman spectra due to the excitation of surface plasmons in metallic nanostructures. This several orders of signal enhancement provides sensitive detection limits of extremely small amounts and concentrations of analyte including structural and quantitative information about the molecules through the characteristic peaks of Raman spectrum. The aim of this work is to synthesize SERS-active substrates by using silver nanowires (Ag NWs) as filter for rapid pathogen detection and characterization in fluids with high sensitivity and specificity. Plasmonic silver nanowires are produced by polyol process using polymer polyvinylpyrrolidone (PVP) as surfactant. Silver nanowire filter foils were fabricated from Ag nanowire solution followed by vacuum filtration onto a hydrophilic polycarbonate filter paper (TETP) membrane. In order to analyze the effect of the presence of PVP on SERS measurments, the developed PVP-capped Ag NW filter foils were processed with laser and chemical treatments to decrease thickness of PVP for the purpose of achieving a higher enhancement factor (EF). As a result of this study, the corresponding enhancement factor (EF) ranges and SERS signal intensities were be obtained by using probe molecules crystal violet (CV) and brilliant cresyl blue (BCB).

Subject Keywords

Surface enhanced raman scattering, Silver nanowires, Polyvinylpyrrolidone, Crystal violet, Brilliant cresyl blue

URI

https://hdl.handle.net/11511/96690

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Measurement of fragmentation properties of charmed particle production in charged-current neutrino interactions Onengut, G; et. al. (Elsevier BV, 2004-12-01) During the years 1994-1997, the emulsion target of the CHORUS detector was exposed to the wide-band neutrino beam of the CERN SPS. In total about 100 000 charged-current neutrino interactions were located in the nuclear emulsion target and fully reconstructed. From this sample of events which was based on the data acquired by new automatic scanning systems, 1048 Do events were selected by a pattern recognition program. They were confirmed as neutral-particle decays through visual inspection. Fragmentation p...
Study of vibrational modes in CuxAg1-xIn5S8 mixed crystals by infrared reflection measurements Hasanlı, Nızamı (2018-04-01) Infrared reflection spectra of CuxAg1-xIn5S8 mixed crystals, grown by Bridgman method, were studied in the wide frequency range of 50-2000 cm(-1). All four infrared-active modes were detected, which are in full agreement with the prediction of group-theoretical analysis. Real and imaginary parts of the dielectric function, refractive index and the energy losses function were evaluated from reflectivity measurements. The frequencies of TO and LO modes and oscillator strengths were also determined. The bands ...
NUMERICAL ESTIMATION OF ENHANCEMENT FACTOR OF SILVER NANOWIRE FILTER FOILS AS SERS SUBSTRATES Yüksel, Selen; Bek, Alpan; Taşgın, Mehmet Emre; Department of Micro and Nanotechnology (2023-1-26) Surface Enhanced Raman Scattering (SERS) is a surface-sensitive vibrational spectroscopy technique. Highly SERS-active substrates made of nanostructured noble metals have been widely investigated owing their activity to the formation of localized surface plasmon resonances, hotspots, where electromagnetic field is amplified by several orders of magnitude locally. Silver and gold are the two most studied noble metals due to their especially low losses and hence high enhancement factors (EF). Gold is chemical...
Measurement of charm production in antineutrino charged-current interactions Onengut, G; et. al. (Elsevier BV, 2004-12-01) During the years 1994-1997, the emulsion target of the CHORUS detector was exposed to the wide-band neutrino beam of the CERN SPS collecting about 10(6) neutrino interactions. A measurement of (nu) over bar (mu)-induced charm production is performed by using the presence of a 5% (nu) over bar (mu) component in the nu(mu) beam. The measurement takes advantage of the capability to observe the decay topology in the emulsion. The analysis is based on a sample of charged-current interactions with at least one id...
Infrared and Raman scattering spectra of layered structured Ga3InSe4 crystals IŞIK, MEHMET; Hasanlı, Nızamı; KORKMAZ ÖZKAN, FİLİZ (2013-03-01) The infrared reflectivity and transmittance and Raman scattering in Ga3InSe4 layered crystals were investigated in the frequency ranges of 100-400, 400-4000 and 25-500 cm(-1). The refractive and absorption indices, the frequencies of transverse and longitudinal optical modes, high- and low-frequency dielectric constants were obtained from the analysis of the IR reflectivity spectra. The bands observed in IR transmittance spectra were interpreted in terms of two-phonon absorption processes.

Citation Formats

H. Oğuz, “Development of SERS-active silver nanowire filter foils for pathogen detection in fluids,” M.S. - Master of Science, Middle East Technical University, 2022.