SURFACE ENHANCED RAMAN SCATTERING WITH GOLD NANOSTAR AND QUANTUM DOT HYBRID STRUCTURES

Download

Master Thesis Duygu Gümüş .pdf

Date

2023-2-24

Author

Gümüş, Duygu

Metadata

Show full item record

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

Item Usage Stats

1222
views

154
downloads

Noble metal nanoparticles (NMNPs) are an area of increasing interest and active research, due to their distinctive optical and electrical properties which are related to localized surface plasmon resonance. In particular, gold nanoparticles (AuNPs) have become focus of intense research due to their superior optical properties among all noble metal nanoparticles. These properties lead them to be used in wide areas of application like imaging, delivery carriers, chemical sensing and optoelectronic devices. Similar to Au NPs, quantum dots (QDs), too, are attracting well deserved attention owing to their enhanced optical and electrical properties like high photoluminescence (PL), photostability and extinction coefficient. Different type of nanomaterials and their combinations are used as a substrate for surface-enhanced Raman spectroscopy (SERS) to aid identification of target analyte. However, to the best of our knowledge, Au nanostars and QDs hybrid structure have not used as a SERS substrate, yet. In this study, star-shaped AuNPs have been synthesized by a seed-mediated growth method. Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) core/shell type quantum dots (QDs) were mixed with star shaped AuNPs in various amounts to observe physical adsorption between QDs and AuNPs. The structure and spectroscopic properties of mixture of QDs and AuNPs were characterized by a combination of UV-Vis spectroscopy, and focused ion beam (FIB). This research demonstrated the potential of this technique to allow controlled signal enhancement of Raman spectroscopy through surface enhanced Raman scattering (SERS).

Subject Keywords

Gold nanoparticles, Surface enhanced Raman scattering, Quantum dots, Altın nanoparçacıklar, Yüzeyde güçlendirilmiş Raman spektroskopisi, Kuantum noktaları

URI

https://hdl.handle.net/11511/102561

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

TiN(IV) oxide coated gold nanoparticles: synthesis, characterization and investigation of surface enhanced raman scattering activities Elçi, Aylin; Nalbant Esentürk, Emren; Department of Chemistry (2017) Noble metal nanoparticles (i.e. gold (Au) and silver (Ag)) have received enormous attention due to their superior optical properties related to localized surface plasmon resonance (LSPR) and their potential applications in sensing, imaging, catalysis and optoelectronic devices. In particular, the ones with anisotropic morphologies have attracted intense interest from the researchers because of their superior optoelectronic properties. High electromagnetic field forms on the nanoparticle surface. The intensi...
Anisotropic electrical and dispersive optical parameters in InS layered crystals QASRAWI, ATEF FAYEZ HASAN; Hasanlı, Nızamı (Elsevier BV, 2010-02-01) The anisotropy effect on the current transport mechanism and on the dispersive optical parameters of indium monosulfide crystals has been studied by means of electrical conductivity and polarized reflectance measurements along the a-axis and the b-axis, respectively. The temperature-dependent electrical conductivity analysis in the range 10-350 K for the a-axis and in the range 30-350 K for the b-axis revealed the domination of the thermionic emission of charge carriers and the domination of variable range ...
Surface-enhanced Raman scattering spectroscopy via gold nanostars Nalbant Esentürk, Emren (Wiley, 2009-01-01) Anisotropic metallic nanoparticles (NPs) have unique optical properties, which lend them to applications such as surface-enhanced Raman scattering (SERS) spectroscopy. Star-shaped gold (Au) NPs were prepared in aqueous solutions by the seed-mediated growth method and tested for Raman enhancement using 2-mercaptopyridine (2-MPy) and crystal violet (CV) probing molecules. For both molecules, the SERS activity of the nanostars was notably stronger than that of the spherical Au NPs of similar size. The Raman en...
Experimental Realization of Single Current Diffusion Tensor Magnetic Resonance Electrical Impedance Tomography Sadighi, Mehdi; Şişman, Mert; Açıkgöz, Berk Can; Eyüboğlu, Behçet Murat (2020-08-08) To obtain low-frequency anisotropic conductivity distribution of biological tissues recently Diffusion Tensor Magnetic Resonance Electrical Impedance Tomography (DT-MREIT), which is combination of DTI and MREIT techniques, is proposed. There are two in vivo applications of DT-MREIT in the literature where two linearly independent current injection patterns are used. Decreasing the number of current injection patterns to one improves the feasibility of DT-MREIT in clinical applications. In this study, DT-MRE...
Thermal and mechanical properties of some fcc transition metals Cagin, T; Dereli, G; Uludogan, M; Tomak, Mehmet (1999-02-01) The temperature dependence of thermodynamic and mechanical properties of six fee transition metals (Ni, Cu, Ag, Au, Pt, Rh) are studied using molecular dynamics (MD) simulations. The structures are described at elevated temperatures by the force fields developed by Sutton and co-workers within the context of the tight binding approach. In these simulations the thermodynamic and mechanical properties are calculated in the temperature range between 0 to 1500 K using the statistical fluctuation expressions ove...

Citation Formats

D. Gümüş, “SURFACE ENHANCED RAMAN SCATTERING WITH GOLD NANOSTAR AND QUANTUM DOT HYBRID STRUCTURES,” M.S. - Master of Science, Middle East Technical University, 2023.