TiN(IV) oxide coated gold nanoparticles: synthesis, characterization and investigation of surface enhanced raman scattering activities

Elçi, Aylin
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 intensity of this field is even higher on the edges and/or tips of the nanoparticles with sharp features. The molecules, which are adsorbed or in close proximity in these regions are polarized. This provides detection of molecules in trace amount by spectroscopic techniques such as surface-enhanced Raman scattering (SERS). Because of all these reasons noble metal nanoparticles with anisotropic morphologies are fascinating candidates as SERS substrates and they are subject of a very active research area. However, agglomeration tendency of noble metal nanoparticles in harsh mediums restrict their application areas. Coating these particles with optically transparent and semiconductive materials (e.g. SnO2, SiO2, and TiO2) make them more durable in harsh conditions while protecting their morphologies and optical properties. In this study, Au nanoparticles in three different morphology (star, rod, sphere) have been synthesized, and coated with tin (IV) oxide (SnO2) layer to obtain hybrid systems in the core-shell structure. Au nanoparticles were synthesized based on a method called “seed-mediated growth method”. The SnO2 coating was performed by using a simple hydrothermal-based method. The synthesized hybrid systems have been fully characterized by a combination of UV-vis spectroscopy, transmission electron microscope (TEM) and energy-dispersive X-ray (EDX) studies, scanning electron microscope (SEM), X-Ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The characterization studies showed that Au nanoparticles with three different morphology were successfully coated with SnO2 layer. Among them, SnO2 coated Au nanostar hybrid system was synthesized for the first time in this study. The potential use of the Au nanostar-SnO2 core-shell system as SERS substrate was also investigated by using crystal violet (CV) as a probe molecule. The SERS studies showed that SERS activity of Au nanostars remains after coating them with SnO2 and the new hybrid system is very promising to be used as a SERS substrate. 


Gümüş, Duygu; Nalbant Esentürk, Emren; Department of Chemistry (2023-2-24)
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. Si...
Multichromic Vanadium Pentoxide Thin Films Through Ultrasonic Spray Deposition
Tutel, Yusuf; Durukan, Mete Batuhan; Cakmak, Huseyin; Koylan, Serkan; Hekmat, Farzaneh; Ozensoy, Emrah; Ozbay, Ekmel; UDUM, YASEMİN; Toppare, Levent; Unalan, Husnu Emrah (2021-10-01)
Vanadium pentoxide (V2O5) is a highly promising material for optoelectronic applications due to its wide optical band gap, significant thermal/chemical stability, and intriguing multichromic properties. Nonetheless, the production of uniform and crack-free V2O5 thin films over large areas via conventional deposition methods remain to be a challenge. In this work, we demonstrate deposition of microscopically uniform, large area (15 cm x 15 cm), nanocrystalline and multichromic V2O5 thin films onto fluorine-d...
Use of gold nanoparticle containing poly (allylamine hydrochloride)/ poly (acrylic acid) multilayer films as sers substrates
Kölemen, Birsu; Ertaş, Gülay; Erel Göktepe, İrem; Department of Chemistry (2015)
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) techniq...
Colloidal CdSe Quantum Wells with Graded Shell Composition for Low-Threshold Amplified Spontaneous Emission and Highly Efficient Electroluminescence
Keleştemur, Yusuf; Anni, Marco; Yakunin, Sergii; De Giorgi, Maria Luisa; Kovalenko, Maksym V. (2019-12-01)
Semiconductor nanoplatelets (NPLs) have emerged as a very promising class of colloidal nanocrystals for light-emitting devices owing to their quantum-well-like electronic and optical characteristics. However, their lower photoluminescence quantum yield (PLQY) and limited stability have hampered the realization of their outstanding luminescent properties in device applications. Here, to address these deficiencies, we present a two-step synthetic approach that enables the synthesis of core/shell NPLs with pre...
Terahertz mobility measurements on poly-3-hexylthiophene films: Device comparison, molecular weight, and film processing effects
Esentürk, Okan; Heilweil, Edwin J. (2008-01-15)
We directly compare relative carrier mobilities in semiconducting organic polymer films measured using noncontact optical pump terahertz (THz) probe spectroscopy to those reported in electrical device studies. Relative transient signal amplitude measurements of photoinjected carrier mobility as a function of poly-3-hexylthiophene (P3HT) molecular weight correlate directly with electrical device test values, indicating that the THz method shows promise as a rapid material screening approach. We also present ...
Citation Formats
A. Elçi, “TiN(IV) oxide coated gold nanoparticles: synthesis, characterization and investigation of surface enhanced raman scattering activities,” M.S. - Master of Science, Middle East Technical University, 2017.