Production and characterization of boron nitride nanotubes

Download

index.pdf

Date

2008

Author

Özmen, Didem

Metadata

Show full item record

Item Usage Stats

292
views

343
downloads

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 synthesized materials were determined by X-Ray Diffraction, Energy Dispersive X-Ray Spectroscopy, nitrogen sorption, X-Ray Photoelectron Spectroscopy, Fourier Transform Infrared Spectroscopy, and Scanning Electron Microscopy. Experiments were conducted in a tubular furnace at different temperatures and also at different weight ratios of boron to iron oxide. Qualitative chemical analysis of the reactor effluent stream was carried out using a mass spectrometer. The mass spectrometer analysis of the reaction products proved formation of nitrogen in addition to hydrogen and water during the reaction of ammonia gas with the mixture of boron and iron oxide. XRD results showed that hexagonal and rhombohedral boron nitrides and cubic iron were the solid phases formed in the product. FTIR and XPS results also indicated the presence of boron nitride and the atomic ratio of boron to nitrogen was compatible with the chemical stoichiometric relation between boron and nitrogen. It was observed that the crystanility of the product increased with an increase in temperature. The diameter of the produced nanotubes varied from 64 nm to 136 nm. The synthesized nanotubes exhibited Type II isotherms. The surface areas of the produced boron nitride nanotubes decreased with a decrease in both temperature and the weight ratio of boron to iron oxide. The best temperature and weight ratio of boron to iron oxide to produce boron nitride nanotubes were found to be 1300°C and 20, respectively.

Subject Keywords

Chemical engineering., Nanotechnology.

URI

http://etd.lib.metu.edu.tr/upload/12609520/index.pdf
https://hdl.handle.net/11511/18069

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Bor nitrür nanotüp üretimi Özmen, Didem; Sezgi, Naime Aslı; Balcı, Suna(2010) 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...
Immobilization of zeolite crystals on solid substrates for biosensor aplications Öztürk, Seçkin; Akata Kurç, Burcu; Department of Micro and Nanotechnology (2010) Electrochemical biosensors are cost effective, fast and portable devices, which can determine the existence and amounts of chemicals in a specific medium. These devices have many potential applications in many fields such as determination of diseases, process and product control, environmental monitoring, and drug research. To realize these potentials of the devices, many studies are being carried out to increase their sensitivity, selectivity and long term stabilities. Surface modification studies with var...
Carbon nanotube production Hocaoğlu, Caner; Sezgi, Naime Aslı; Özbelge, H. Önder; Department of Chemical Engineering (2011) Carbon nanotubes (CNTs), allotropes of carbon with a cylindrical nanostructure, are one of the most attractive research subjects for scientists and industry because of their extraordinary chemical, electrical, optical, mechanical and thermal properties, and their wide range of potential application areas. Mainly, there are two types of carbon nanotubes: single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs). The most commonly used methods for carbon nanotube production are arc disc...
Processing and characterization of carbon nanotube based conductive polymer composites Yeşil, Sertan; Bayram, Göknur; Department of Chemical Engineering (2010) The aim of this study was to improve the mechanical and electrical properties of conductive polymer composites. For this purpose, different studies were performed in this dissertation. In order to investigate the effects of the carbon nanotube (CNT) surface treatment on the morphology, electrical and mechanical properties of the composites, poly(ethylene terephthalate) (PET) based conductive polymer composites were prepared by using as-received, purified and modified carbon nanotubes in a twin screw extrude...
Synthesis of gold nanowires with high aspect ratio and morphological purity Dertli, Elçin; Nalbant Esentürk, Emren; Ünalan, Hüsnü Emrah; Department of Micro and Nanotechnology (2012) 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 exampl...

Citation Formats

D. Özmen, “Production and characterization of boron nitride nanotubes,” M.S. - Master of Science, Middle East Technical University, 2008.