Synthesis of tin oxide-coated gold nanostars and evaluation of their surface-enhanced Raman scattering activities

Tin oxide-coated gold nanostar hybrid nanostructures are prepared by first synthesizing gold nanostars (ca. 400nm), then introducing Na2SnO3 precursor followed by its hydrolysis and formation of a tin oxide layer on nanoparticle surface. The synthesized hybrid structures have been characterized by combination of UV-Vis spectroscopy, transmission electron microscope (TEM), energy-dispersive X-ray studies, scanning electron microscope (SEM), X-Ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The TEM and SEM analyses showed that gold nanostars have a coating with an approximate thickness of 15nm. The tin (IV) oxide coating on the gold nanostars was identified by XRD and XPS analyses and confirmed by FTIR spectroscopy. Surface-enhanced Raman scattering (SERS) spectroscopy was performed on tin oxide-coated and uncoated gold nanostars with crystal violet as a probe molecule. The SERS studies revealed field enhancement properties of Au nanostars, thus their strong SERS activity remained after tin oxide coating.


Gold nanostar @ iron oxide core-shell nanostructures: synthesis, characterization, and demonstrated surface-enhanced Raman scattering properties
Nalbant Esentürk, Emren (2013-01-01)
Iron oxide-coated gold nanostars are produced by first synthesizing gold nanostars (ca 150 nm), then introducing a polyvinylpyrollidone coating followed by reducing iron(II) and iron(III) salts on the nanoparticle (NP) surface. Morphological and chemical composition characterizations of these composite nanomaterials were performed via field-emission transmission electron microscopy/energy dispersive spectroscopy studies. The analysis revealed that the majority of the NPs had coating of approximately 1-5 nm ...
Application of CaO-based/Au nanoparticles as heterogeneous nanocatalysts in biodiesel production
Bet-Moushoul, Elsie; Farhadi, Khalil; Mansourpanah, Yaghoub; Nikbakht, Ali Mohammad; Molaei, Rahim; Forough, Mehrdad (2016-01-01)
In this work, five different types of calcium oxide-based catalysts supported gold nanoparticles (AuNPs) (named as nanocatalyst), including commercial CaO, egg shell, mussel shell, calcite, and dolomite were prepared and used in biodiesel synthesis. The optimal conditions of transesterification process were observed at 65 degrees C with a methanol to oil molar ratio of 9:1, a reaction time of 3 h and a catalyst loading of 3%. Under optimum conditions, the oil conversion was in the range of 90-97% and the gl...
Synthesis and Characterization of Zirconium based Bulk Amorphous Alloys
Saltoğlu, İlkay; Akdeniz, Mahmut Vedat; Mehrabov, Amdulla (2005-09-28)
In recent years, bulk amorphous alloys and nanocrystalline materials have been synthesized in a number of ferrous and non-ferrous based alloys systems, which have gained some applications due to their unique physico-chemical and mechanical properties. In the last decade, Zr-based alloys with a wide supercooled liquid region and excellent glass forming ability have been discovered. These systems have promising application fields due to their mechanical properties; high tensile strength, high fracture toughne...
Growth of branched gold nanoparticles on solid surfaces and their use as surface-enhanced Raman scattering substrates
Nalbant Esentürk, Emren; Coskun, S.; Kozanoglu, D.; Ertaş, Gülay; Ünalan, Hüsnü Emrah; Nalbant Esentürk, Emren (2015-01-01)
Branched gold (Au) nanoparticles (NPs) were synthesized directly on surfaces of three different supports (silicon, glass, indium tin oxide (ITO)) by following a "seed-mediated" method. Growth of the nanostructures in high yield and all with branched morphology was achieved on all surfaces. Nanostructures with desired characteristics were synthesized by determining the optimum seed size (8 nm Au nanospheres) and pH (3.00) of the growth solution. The Au NPs synthesized under these conditions have branched mor...
Preparation, characterization, and antibacterial activity of organo-sepiolite/chitosan/silver bionanocomposites
TEKİN, NALAN; Şafaklı, Akif; BUDAK, FATMA; KARA, ALİ (2019-05-01)
Bionanocomposites with different loadings of silver (Ag) were prepared via synthesis of Ag nanoparticles (AgNPs) using the wet chemical reduction method in the lamellar space layer of the organo-sepiolite/chitosan (O-SEP/CS). The prepared O-SEP/CS/Ag bionanocomposites were characterized using various analysis methods for their structure, morphology, and optical properties. The characteristic absorption bands from the UV-visible absorption spectrum confirmed the formation of AgNPs. The antibacterial activiti...
Citation Formats
A. Elcı, O. Demırtas, İ. M. Öztürk, A. Bek, and E. Nalbant Esentürk, “Synthesis of tin oxide-coated gold nanostars and evaluation of their surface-enhanced Raman scattering activities,” JOURNAL OF MATERIALS SCIENCE, pp. 16345–16356, 2018, Accessed: 00, 2020. [Online]. Available: