Comparative study on surface enhanced raman scattering activity of various silver nanostructures

Download

index.pdf

Date

2017

Author

Demirtaş, Özge

Metadata

Show full item record

Item Usage Stats

217
views

87
downloads

In this work, the effect of the strong field enhancement generated in the near field of metal nanoparticles and nanowires was investigated by taking advantage of the plasmon frequencies induced by Raman laser light stimulation of free conduction electrons of these metal nanostructures. Small number of molecules that are either bound to these nanostructures or located up to a few nanometers away from the nanostructures can be detected easily through strong electromagnetic field enhancement. The aim of this work was to investigate the surface enhanced Raman scattering (SERS) effect of crystal violet (CV) and brilliant cresyl blue (BCB) molecules interacting with silver nanoparticle (Ag NP) and silver nanowire (Ag NW) that are deposited onto silicon surfaces. Statistical measurements on SERS effect, which is an application of localized surface plasmon resonance (LSPR) were acquired and corresponding enhancement factor (EF) ranges were revealed. The fact that plasmon lifetime of polyol synthesized colloidal Ag NPs and Ag NWs are long due to their smooth crystalline surfaces at the atomic level providing strong plasmon interaction of these structures. In addition, the interaction between nanostructures also depends on the number of hot spots between aggregated nanostructures, and the LSPR wavelength. Although LSPR wavelengths of nanostructures and maximum absorption wavelength of the analytes used in this work are not in resonance with the laser light, maximum EF values documented in the literature were obtained.

Subject Keywords

Nanowires., Raman effect., Colloidal silver., Nanostructures.

URI

http://etd.lib.metu.edu.tr/upload/12620797/index.pdf
https://hdl.handle.net/11511/26259

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Analysis of reconstruction performance of magnetic resonance conductivity tensor imaging (MRCTI) using simulated measurements DEĞİRMENCİ, EVREN; Eyüboğlu, Behçet Murat (2017-01-01) Magnetic resonance conductivity tensor imaging (MRCTI) was proposed recently to produce electrical conductivity images of anisotropic tissues. Similar to magnetic resonance electrical impedance tomography (MREIT), MRCTI uses magnetic field and boundary potential measurements obtained utilizing magnetic resonance imaging techniques. MRCTI reconstructs tensor images of anisotropic conductivity whereas MREIT reconstructs isotropic conductivity images. In this study, spatial resolution and linearity of five rec...
A Comparison of Velocity Skin Effect Modeling With 2-D Transient and 3-D Quasi-Transient Finite Element Methods Tosun, Nail; Ceylan, Doga; Polat, Hakan; Keysan, Ozan (2021-04-01) The analysis of the velocity skin effect (VSE) in electromagnetic launchers (EMLs) requires a 3-D transient finite element method, unlike magnetic skin and proximity effects. However, VSE is dominant at high speeds, and this creates convergence problems when moving or deformed mesh physics is used in a transient FEM in the 3-D analysis. Commercial finite element software cannot solve the electromagnetic aspects of such a high-speed application with a transient solver in 3-D. Although 2-D approximations can ...
Direct and real-time observation of sub-micron domain dynamics in magnetically biased strontium ferrite permanent magnets by room temperature scanning micro-Hall probe microscopy Sandhu, Adarsh; Iida, Naoji; Masuda, Hiroshi; Oral, Ahmet; Bending, Simon J. (2001-01-01) A room temperature scanning micro-Hall probe microscope (RT-SHPM) was used for imaging stray magnetic field fluctuations at the surfaces of strontium ferrite permanent magnets (SFM) in the presence of external bias fields. The RT-SHPM enables the extremely fast, non-invasive, and quantitative measurement of localized surface magnetic fields on the sub-micron-scale. A 0.8 × 0.8 μm2 GaAs/AlGaAs micro-Hall probe (300K Hall coefficient = 0.3Ω/G; field sensitivity = 0.04 G/√Hz) with an integrated STM tip for pre...
Direct and real-time observation of sub-micron domain dynamics in magnetically biased strontium ferrite permanent magnets by room temperature scanning micro-Hall probe microscopy Sandhu, Adarsh; Iida, Naoji; Masuda, Hiroshi; Oral, Ahmet; Bending, Simon J. (2001-01-01) A room temperature scanning micro-Hall probe microscope (RT-SHPM) was used for imaging stray magnetic field fluctuations at the surfaces of strontium ferrite permanent magnets (SFM) in the presence of external bias fields. The RT-SHPM enables the extremely fast, non-invasive, and quantitative measurement of localized surface magnetic fields on the sub-micron-scale. A 0.8 × 0.8 μm2 GaAs/AlGaAs micro-Hall probe (300K Hall coefficient = 0.3Ω/G; field sensitivity = 0.04 G/√Hz) with an integrated STM tip for pre...
Optimization of open-tube furnace diffusion with Bbr3 liquid source for industrial p-type boron doping process Orhan, Efe; Kökbudak, Gamze; Semiz, Emel; Es, Fırat; Turan, Raşit (Middle East Technical University; 2018-07-06) In this study, optimization of boron emitter for n-type crystalline Si solar cells has been studied in detail. Industrial open-tube (atmospheric) furnace with BBr3 as liquid B source was utilized which is a preferred dopant for the diffusion process of n-type wafers in industry [1] [2]. During the processes, full boat (270 wafers) n-type square samples were used to investigate the uniformity from gas zone to door zone and inside the wafer. To achieve uniform boron emitters on large n-type substrates, parame...

Citation Formats

Ö. Demirtaş, “Comparative study on surface enhanced raman scattering activity of various silver nanostructures,” M.S. - Master of Science, Middle East Technical University, 2017.