Use of gold nanoparticle containing poly (allylamine hydrochloride)/ poly (acrylic acid) multilayer films as sers substrates

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Kimya Bölümü, Türkiye

Tezin Onay Tarihi: 2015

Tezin Dili: İngilizce

Öğrenci: BİRSU KÖLEMEN

Asıl Danışman (Eş Danışmanlı Tezler İçin): Gülay Ertaş

Eş Danışman: İrem Erel Göktepe

Özet:

Surface-enhanced Raman spectroscopy (SERS) is a surface sensitive vibrational spectroscopy technique that results in the enhancement of Raman scattering by molecules adsorbed on rough metal surfaces. It is a powerful, sensitive and non-destructive technique which is used in chemical, material and life sciences including biosensing, catalysis, spectroelectrochemistry, criminology, single molecule SERS applications and many others. Nanoparticle (NP) embedded multilayer films using Layer by Layer (LbL) technique is one of the types of SERS substrates that have unique properties. Herein, pH-controllable exponentially grown (rougher) and linear grown (smoother) (Poly(allylamine hydrochloride)/Poly(acrylic acid)) polyelectrolyte-NP multilayer film systems were studied for sensing benzenethiol (BT) molecule (up to 10-7M). The effects of number of polyelectrolyte layers and deposition times of gold (Au) NPs on SERS signals were studied and the enhancements in Raman signals are similar for all the studied systems. Characterizations of these surfaces are made by UV-vis Spectrometer, Zeta sizer, Atomic Force Microscope (AFM) and Raman Spectrometer.