سال انتشار: ۱۳۸۶

محل انتشار: دومین کنفرانس نانوساختارها

تعداد صفحات: ۲

نویسنده(ها):

R Ashiri – aDepartment of Material Science & Engineering, Sharif University of Technology
M.S Ghamsari – Solid State Laser Division, Laser Research Center
Z.A Nemati – aDepartment of Material Science & Engineering

چکیده:

Nanostructured film of barium titanate is known as a key material for different applications such as memories, thermistors, sensors, actuators and various electro-optic devices. Multilayer ceramic capacitors (MLCC), semiconductors with positive temperature coefficient of resistance (PTCR) and pyroelectric detectors are other possibilities applications of this material. Sol-gel is one of the methods that can be used for giving pure and doped barium titanate thin nanofilm in the low temperature procedure. In this method the addition of a dopant element can be done more exactly than conventional solid state methods. In this research a highly stable, water-based BaTiO3 sol system was developed by a chelate acetate sol-gel process. Acetate derived barium titanate sol was prepared by glacial acetic acid, barium acetate, titanium isopropoxide (TTIP), 2- propanol and water precursors. Barium acetate was dissolved in hot glacial acetic acid (molar ratio 1/6). After cooling, TTIP is added in stoichiometric amount (molar ratio Ba/Ti = 1). A two stage hydrolysis was performed by adding excess water (molar ratio H2O/Ti = 150) after introducing 2-propanol to solution. Sols that prepared by this procedure was stable excess than 6 months to ever. UV-Visible photospectrometer and Fourier transform infrared (FT-IR) analysis was used for characterization of the prepared sol.