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

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Master Thesis Duygu Gümüş .pdf

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2023-2-24

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Gümüş, Duygu

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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

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Graduate School of Natural and Applied Sciences, Thesis

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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.