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The crystal structure of perovskite-type oxyfluoride, PbFeO₂F transformed form cubic to tetragonal in the vicinity of 400 K. It is found that cubic PbFeO₂F is the high temperature phase stabilized by quenching while the tetragonal phase is stable at room temperature.

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Lithium niobate (LiNbO3) thin films were deposited on Al2O3(001) substrates by metal-organic chemical vapor deposition (MOCVD) method, using Li(dpm) and Nb(C2H5)5 as precursors. By controlling the N2 carrier gas flow rate of Li(dpm), vaporization pressure of Nb(OC2H5)5, and deposition pressure, we investigated the influence of deposition conditions on LiNbO3 thin films. When deposition pressure of Nb(OC2H5)5 was varied by 1.07*10^4-2.00*10^4Pa, composition of the films were changed by increasing deposition pressure. Stoichiometric (Li:Nb=1:1) LiNbO3 thin film was successively prepared when deposition pressure of Nb(OC2H5)5 was 1.33*10^4Pa. By optimizing the condition of film deposition, epitaxial LiNbO3 thin film with stoichiometry composition was prepared.

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It has been conducted that XTEM-EELS analysis of the electric and the optical properties in nano-region of 001 PMN-PT epitaxitial layers deposited on Si wafer with (La,Sr)CoO3-x/CeO2/YSZ triple buffer layer. The valence electron characteristics, inter-band transitions and plasmon excitation, have been observed. The band gap energy has been 3.5eV. Optical properties has also been considered.

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A development of hydrogen gas sensor is necessary in order to achieve a hydrogen energy generation system in practical use. We have already reported that the titania thin films which were co-loading platinum and palladium fine particles were prepared by wet chemical processes and the change of electro conductivity with high responsibility and concentration dependence against air-diluted hydrogen gas. In this study, a narrow gap electrode was set in this thin film in order to decrease the working temperature of gas sensing and to increase the responsibility in low concentration range of air-diluted hydrogen gas.

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We present a simple and effective preparation route of a Pd thin film, a candidate material for an optical H2 gas sensor operated at room temperature. The Pd films were prepared on a glass substrate by r.f. magnetron sputtering. The Pd films prepared by using electroplating and electroless plating processes exhibited a clear sensing response in optical transmittance in the presence of H2 gas at room temperature.

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After the first report on the Synthesis of TiO2 nanotube by Kasuga et al., much attention was paid to their synthesis process, structure and chemical/physical properties. We have investigated on the relationship between processing and various characteristics, photochemical properties including photo-catalytic performance, electrical properties and so on. In addition, we have developed various kind of multifunctional TiO2 NTs by using doping method, compositing with nano-sized metal and compounds in order to add novel functions. Especially, compositing of TiO2 NTs with semiconductor compound such as ZnS are recently succeeded by using solution chemical and vapor phase routes. In this paper detailed relations between synthesis processes and properties/structural characteristics for the TiO2 NTs/Semiconductor compound nanocomposites will be reported.

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Recently, metal-nanostructured substrates with tunable SPR including nanorods, nanowires and nanotriangles et al., have been applied as SERS substrates to improve the sensitivity and reliability of conventional chemical and biological sensors.Here, these Ag nanoparticles with different shapes were self-assembled on glass substrates and served as ideal substrates for studying the single-particle SERS enhancement dependence of metal shapes by using near-field scanning Raman spectroscopy combined with in situ AFM.

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Structure and proton conductivity of the gypsum treated with various concentration of phosphoric acid was evaluated in wide range of temperature for the application to the electrolyte of fuel cells. Crystal structure of the sample was stable after thermal treatment. The gypsum treated with 17 weight percent of phosphoric acid showed 7 × 10^-4 S/cm of conductivity at 200°C without humidification.

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High-rate lithium intercalation properties of reassembled titanate nanosheets prepared by various exfoliation/reassembly processes were examined. Titanate nanosheets were obtained by exfoliation of tetratitanate with layered structure. Reassembled titanate nanosheets were prepared by reassembly of the colloidal suspensions of tetratitanate nanosheets with various dispersing media. Reassembled titanate nanosheets using methanol as dispersing media exhibited a reversible capacity of 170 mAh g-1 at relatively small current density, and a large capacity of 140 mAh g-1 at a current density of 1 A g-1. Reassembled titanate nanosheets using methanol as dispersing media showed a superior high-rate capability to that using water as dispersing media.

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&Alpha-NaFeO2-type layered NaRuO2 possess a structure with 0.25 nm RuO2 slabs interleaved with Na+. Hydrous NaxRuO2 derived from the reaction of layered NaRuO2 with water showed no ion-exchange capability. On the contrary, hydrous NaxRuO2 derived via reaction of layered NaRuO2 with Br2 exhibited ion-exchange capability; tetrabutyl ammonium was able to be introduced into the interlayer. A ruthenic acid nanosheet colloid was obtained by suspending the tetrabutyl ammonium-RuO2 intercalation compound in water. Specific capacitance of 790 F g-1 was obtained in sulfuric acid solution with a re-stacked nanosheet electrode, suggeting that the present material is promising as electrodes for electrochemical capacitors.

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The electrode materials of supercapacitor are important research targets, recently. Manganese oxide is one of the promising electrode materials. The specific capacitance of manganese oxide are affected by many factors, however, until now there is no any report about the contribution of each factor to the specific capacitance of manganese oxides. This study tries to prepare the manganese oxide film on the titanium metal plate by galvanostatic anodic deposition to get the electrode membrane of capacitors. The Taguchi method was used to analyze the contribution of deposition temperature, current density, Mn(CH3COO)2 4H2O concentration and pH to the specific capacitance of manganese oxides. The cyclic voltammetry was used to test the pseudocapacitor behavior and specific capacitance in 0.1 M Na2SO4 solution. The results showed that the sequence of factors with respect to the contribution to specific capacitance of manganese oxides were the deposition temperature, current density, interaction between deposition temperature and current density, and concentration of Mn(CH3COO)2 solution.

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Aerosol deposition process is a unique process to make ceramic film at room temperature. In resent years, Yttrium oxide is known to have an excellent plasma resistance for semiconductor industry. Yttrium oxide films with no voids were prepared by aerosol deposition process on aluminum alloy and quartz substrate. In this study, mechanical and optical properties were examined before and after thermal shock. As a result, the films had a good adhesion force and no crack.

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In Aerosol Deposition Process (AD), a ceramic film around 1-100 microns thickness is formed directly onto substrate by emitting ceramic micro powder jet in room temperature. Recently, AD Y₂O₃ film is known to have excellent electrical and mechanical properties. In this study, the AD Y₂O₃ film was applied to the dielectric layer of electrostatic chuck (ESC). ESC is currently utilized for adsorptive immobilization of semiconductors, but it hardly adsorbs insulators. By arranging the AD Y₂O₃ dielectric layer on dye-pole with fine pattern, ESC samples were obtained which adsorbed even insulators very well with low voltage in room temperature.

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