Preparation of titanium dioxide and barium titanate nanothick film by Langmuir-Blodgett technique

The TiO2 and BaO(TiO2)(x) thin him was prepared by the Langmuir-Blodgett (L B) technique. The mixture of octadecyl polymaleicate and tetrabutoxytitaniu m was spread on the surface of water subphase, then transferred onto substr ates. The obtained LB multilayer was converted into a nano-thick TiO2 him b y calcination at 500 degreesC for 30 min. When an appropriate amount of BaC l2 was added into a water subphase, it was co-transferred onto a LB multila yer film. After calcination at the same condition, BaO(TiO2)(x) thin films with different ratios of x could be obtained by adjusting the pH value of t he water subphase. The Fourier transform infrared spectroscopy and X-ray ph otoelectron spectra measurements were used to confirm the formation of TiO2 and BaO(TiO2)(x) thin films. The integrated peak area in X-ray photoelectr on spectra gave the atomic ratio of Ti/O and Ti/Ba. The surface morphology of the LB multilayer before and after calcination was investigated by atomi c force microscopy. The image showed that the smooth and high cover surface of TiO2 and BaO(TiO2)(x) thin films were obtained after calcination. The r ms roughness for a 21-layer him after calcination was approximately 25 Angs trom, which was less than that of before calcination of approximately 45 An gstrom. The resulting particle size was approximately 0.05 mum and almost u niform. (C) 2000 Published by Elsevier Science B.V. All rights reserved.