سال انتشار: ۱۳۹۰

محل انتشار: اولین همایش ملی نانومواد و نانو تکنولوژی

تعداد صفحات: ۷

نویسنده(ها):

A. Kazemzadeh – Materials & Energy Research center
Badii –

چکیده:

In this paper multi-wall carbon Nano-tubes (MWNT) were prepared by using chemical – Thermal vapor deposition method and utilizing molybdenum and iron catalysts and silica alumina – base.Methane was passed over catalyst in optimum condition including passing speed equal to 4 lit/min and pressure of 1.27 bar for 2-25 minutes and temperature of furnace was equal to 980°c .Diameter and specific area of Nano-tubes were 10-70 nm and 400-560 m2/g respectively. Various quantities of Fe2O3-ZnO and 0.1 % palladium were inserted in carbon used for prepared Nano-tubes by utilizing vacuum evaporation which its optimum quantity was( 2.50% (1/1W/W) Fe2O3-ZnO) and 0.1 % palladium in order to enhance sensitivity of carbon Nano-tubes relative toNH3 to make sensors appropriate for low temperatures. For investigation instruments anddetermining physical properties, XRD, SEM and TEM equipments have been applied and prepared. NH3 sensor is simple, low cost and ready to use in various environment