Synthesis of gold nanowires with high aspect ratio and morphological purity

Download

index.pdf

Date

2012

Author

Dertli, Elçin

Metadata

Show full item record

Item Usage Stats

262
views

73
downloads

Metal nanoparticles have unique optical, electrical, catalytic and mechanical properties, which lead them to various applications in nanotechnology. In particular, noble metal nanowires are attracting growing attention due to their potential applications such as in opto-electronic devices and transparent conductive contacts (TCCs). There are two general approaches to synthesize nanowires: template-assisted and solution phase methods. However, these synthesis approaches have various disadvantages. For example, removal of the template to ensure the purity of the synthesized nanowires is the major problem. In solution methods like the widely used “seed mediated growth method”, nanowires are synthesized in low yield with the significant amount of by-products and requirement of purification is a major problem for further applications. Among all solution based methods, hydrothermal process is a very promising way of preparing gold (Au) nanowires in high yield and structural purity. In this thesis, hydrothermal process was modified to synthesize high aspect ratio Au nanowires with high morphological purity. Parametric study was performed to examine the effect of surfactant concentration, reaction time and temperature on the quality of products. The optimum conditions were determined for two different surfactant molecules (hexamethylenetetramine (HMTA) and ethylenediaminetetraacetic acid (Na2-EDTA)). Characterization of the products was done by detailed analysis via scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), X-Ray diffraction (XRD) and X-Ray photoelectron spectroscopy (XPS). The analyses demonstrated that the Au nanowires synthesized at optimum conditions have high aspect ratio (diameters 50-110 nm range and lengths in micrometer range) and high structural purity.

Subject Keywords

Nanoparticles., Gold., Nanowires., Nanostructured materials., Electron microscopy., Photoelectron spectroscopy.

URI

http://etd.lib.metu.edu.tr/upload/12614710/index.pdf
https://hdl.handle.net/11511/21944

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Synthesis, functionalization and characterization of gold nanoparticles Sholanbayeva, Zhanar; Nalbant Esentürk, Emren; Durucan, Caner; Department of Micro and Nanotechnology (2012) Metallic nanoparticles (NPs) with various elemental composition, size, shape and physical or chemical properties has become active field of research. Among all the metal NPs noble metal ones are receiving much attention due to their special optical properties which make them useful for different applications. Noble metal NPs have bright colors resulting from strong surface plasmon resonance absorption usually in the visible region. The colors are size and shape dependent and provide the tuning of optical pr...
Synthesis of silver nanowires through polyol process Coşkun, Şahin; Ünalan, Hüsnü Emrah; Department of Metallurgical and Materials Engineering (2012) Nanotechnology enabled synthesis of various shapes and morphologies of conventional materials. Nanotubes, nanoparticles, quantum dots and nanowires are the new form of materials. Especially nanowires have gotten great attention due to their unique physical, chemical and optical properties. Superior properties of nanowires are based on their high surface area and two quantum confinement directions. Silver is one of the most conductive metals and it has the highest thermal conductivity. Due to excellent prope...
Production and characterization of boron nitride nanotubes Özmen, Didem; Sezgi, Naime Aslı; Department of Chemical Engineering (2008) The further developments in nanotechnology in last few years provide usage of nanoscale particles for many applications in various areas such as electronics, pharmaceutical, and biomedical due to their strengthened mechanical, thermal and electrical properties. Boron nitride nanotubes are a good example of nanoparticles. In this study, boron nitride nanotubes were successfully synthesized from the reaction of ammonia gas with mixture of boron and iron oxide. Physical and structural properties of the synthes...
Synthesis of BaHF Ceramics by Microwave Heating Emel, Erdal; Tulbez, Sımge; Dericioğlu, Arcan Fehmi (null; 2016-11-25) Barium hexaferrite (BaFe12O19, BaHF) is an important magnetic material due to its effective electromagnetic wave absorbing characteristics. The most convenient way of producing BaHF ceramics is mixed oxide method in which BaHF powders are synthesized from Fe2O3 and BaCO3 starting materials by the action of heat. The calcination process is typically conducted by conventional heating under ambient atmosphere. However, microwave heating can be ...
Structural Vibration Analysis of Single Walled Carbon Nanotubes with Atom Vacancies Dogan, Ibrahim Onur; Yazıcıoğlu, Yiğit (2014-11-01) Recent investigations in nanotechnology show that carbon nanotubes have significant mechanical, electrical and optical properties. Interactions between those are also promising in both research and industrial fields. Those unique characteristics are mainly due to the atomistic structure of carbon nanotubes. In this paper, the structural effects of vacant atoms on single walled carbon nanotubes are investigated using matrix stiffness method. In order to use this technique, a linkage between structural mechan...

Citation Formats

E. Dertli, “Synthesis of gold nanowires with high aspect ratio and morphological purity,” M.S. - Master of Science, Middle East Technical University, 2012.