Yüzeylerin Titanyum Nanoçubuklar Ve Onların Altın/Gümüş İle Modifiye Formları İle Nanodesenlenmesi Ve Farklı Alanlarda Kullanılabilirliklerinin İncelenmesi
Özden Dinç, Dilek Şura
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Nanoscience and nanotechnology transform the material science into a wide range, providing the continuous development of new nanostructured materials. A comprehensive examination of physicochemical phenomena at the nanoscale brings new approaches to innovative technologies that constantly open products with a wide range of applications. Developed with these approaches, nanostructured titanium is of great importance in the development of functional materials that can be used in many applications such as photocatalysis, sensor, photovoltaic, water hydrolysis, lithium ion batteries, tissue engineering and biomedical applications. Within the various oxide and non-oxide 3D nano-structured materials, titanium nanorods have attracted considerable attention due to their unique properties. Many techniques used in the production of titanium nanorods are techniques that do not provide control over the crystal structures and layouts of these structures and production parameters are troublesome. Titanium nanorods thermally evaporated by physical vapor deposition (PVD) method were deposited on a silicon wafer to form anisotropic titanium nanorod (TiNR) array surfaces with a new technique developed as an alternative to these difficulties and tested for use in various fields. The intensities of the TiNR structures formed by the oblique angle deposition (OAD) method were adjusted by the variation of the vapor phase deposition angle (α) and the porous structure surfaces were obtained. For the sensor uses of the surfaces, firstly the method development with SERS technique is aimed and the modifications that increase the surface sensitivity are performed with gold and silver film coating. Gold and silver coated TiNR surfaces for use in SERS, catalysis and cell interaction studies have been thermally processed (annealed) at various temperatures and transformed into metal film particles and island structures with dewetting effect. The gold/silver nanoisland/nanodot structures formed on the TiNR surfaces have shown a positive effect on the SERS signal. Depending on the radius, geometry and density, localized surface plasmons are formed on the TiNR surface, at the end of the structures and between them, and this ensures raman enrichment. For this purpose, MB (methylene blue) raman molecule is used to test these structures by the use of SERS. Repeatable results with high signal/noise ratio have been achieved successfully. The gold/silver particulated TiNR structures obtained by this approach have been tested as catalytic structures for reduction of p-nitroaniline (PNA) which are environmental waste to the p-phenylenediamine (PDA). It has been observed that the catalytic conversion occured on each surface, especially on the TiNR surfaces modified with gold particles. The catalysis was determined to be dependent on the size and density of the gold/silver nanoisland/nanodot structures formed on the TiNR surfaces, and the gold nanoisland coated TiNR structure in the porous structure with the highest surface area was found to exhibit the best catalytic conversion. For biomedical field use of gold/silver nanoisland/nanodot coated TiNR surfaces was tested to examine adhesion, toxicity properties and interaction with Saos-2 human bone cancer cells. Biological studies have shown that the cytotoxic effect of the modified surfaces is rather weak and the biocompatibility is quite good. Gold and silver coated TiNR surfaces with rough surface have allowed the cells to hold, stick and spread on the surfaces.