Rong-Fuh Louh

Fabrication of barium titanate ferroelectric layers by electrophoretic deposition technique

Abstract Electrophoretic deposition (EPD) technique has been shown as an effective method to produce thin or thick layers onto electrically conductive substrates. The aim of this study is to use the EPD method to fabricate the BaTiO 3 ferroelectric layers with high dielectric constant. Pure titanate powder added in a mixture of acetylacetone (Acac) and ethanol (EtOH) (1:1 volumetric ratio) was formed as an EPD suspension. The effects of the EPD process parameters such as the suspension concentration, deposition time, electrical field strength, substrate size and shape, and chemical or mechanical treatment of EPD suspension on the specific EPD deposited weight were investigated. Facing the same counter-electrode, two or more substrates can be deposited with ceramic layers simultaneously. The sintered BaTiO 3 ferroelectric layers, which were prepared via the EPD route were sufficiently dense and had uniform microstructure.

Quantitative Characterization of the Liquid Crystal Doped With Nanoscaled Tin-Doped Indium Oxide Under High Electric Fields

In this paper, a pulse circuit was designed to simulate the source of an electrostatic discharge (ESD). This high-voltage source was successfully used in ESD tests to precisely control the voltage exerted on the liquid crystal (LC) cells. In addition, the characteristics of the samples under ESD were measured by a more precise pulse source. According to the measurement of the relaxation of the sticking images, the behavior of the tin-doped indium oxide (ITO) nanoparticles in the LC was investigated in detail. It was confirmed that the amount of ITO may affect the speed of releasing high-voltage charges after the attack of ESD. In addition, we tried to estimate the resistivity and density of the conductive ITO bridges.