Browsing by Subject "Chemical vapor deposition (CVD)"

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Chemical vapor deposition of boron nitride nanotubes
(2013) Çiftçi, Niyazi Okan
Since ancient times materials that are available and used by people constitute indispensable constituent parts of world history. The historical ages are named after the materials which paved an irrevocable way to this stream and revolutionize the progress of history by changing the rhythm of anthropological breakthrough irreversibly. People have used these materials either directly borrowing from nature or by transforming those that are given. As we approach to modern society two methods namely a top-down method using transmission of experiences of before generations conventionally and bottom-up method by application of modern science and technology to understand subtleties of materials and engineering them for the specific goals. Boron nitride nanotubes are one class of these materials having superior properties to the conventional ones. High strength, electrically insulator property, controllable wide band gap and high oxidation resistance as compared to carbon nanotubes put them to the first ranks for the design of the future devices for our modern society. Hence a simple and inexpensive way of production of this kind of materials is utmost importance. For this in this thesis an inexpensive and a very practical way of BNNTs production is elucidated. The reactants boron (B), iron (III) oxide (Fe2O3) and magnesium oxide (MgO) are used as solid precursors. A CVD furnace reaching up till 1200 oC with a special design of added concentric quartz tubes equipped with NH3 and Argon gas served as reaction chamber.