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Takeo Hyodo, Kazuhiro Sasahara, Yasuhiro Shimizu, Makoto Egashira
Session ID: 1C11
Published: 2003
Released on J-STAGE: July 05, 2004
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Macroporous SnO2 (m-SnO2) thick film was fabricated by a modified sol-gel method employing polymethylmethacrylate (PMMA) microspheres (150 ∼870 nm) as a template and SnCl2 as a tin source. The morphology of m-SnO2 thick films was largely dependent on the kind of solvents, concentration of SnCl2 in methanol, and the diameter of PMMA microspheres. H2 sensing property of the m-SnO2 thick films was also investigated in the templerature range of 250 ∼ 500°C.
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Tsuyoshi Hamaguchi, Shinsuke Yamanaka, Masayoshi Uno, Tomoaki Nakata, ...
Session ID: 1C12
Published: 2003
Released on J-STAGE: July 05, 2004
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The tin oxide nanohole arrays have been prepared by an anodic alumina in ammonium hexafluorostannate at room temperature for a few hours. Pt electrodes were sputtered on the tin oxide nanohole array. NO2 and H2 gas sensitivity of SnO2 nanohole array was evaluated.
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Ken-ichi Katsumata, Yoshikazu Kameshima, Kiyoshi Okada, Atsuo Yasumori
Session ID: 1C13
Published: 2003
Released on J-STAGE: July 05, 2004
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The purpose of this study is to prepare a porous TiO2 thin film which had high humidity sensitivity. The samples were prepared by use of RF magnetron sputtering using with TiO2-SiO2 sintered target and subsequent selective leaching of SiO2 component. The compositions of targets were set as x =80-100 mass% in xTiO2-(100-x)SiO2. Clear relationship was found between electric resistance and relative humidity. The electrical resistances of the samples without selective leaching were smaller than those of leached samples. Since the tendency of electrical resistance change against humidity changed at about 50%RH, the conducting mechanism is considered to be different between low and high humidity regions.
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Hui-suk Yun, Makoto Kuwabara, Haoshen Zhou, Itaru Honma
Session ID: 1C27
Published: 2003
Released on J-STAGE: July 05, 2004
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Mesostructured PWA(12-phosphotungstic acid; H3PW12O40)thin films have been synthesized by a sol-gel method using triblock copolymer templates. Mesostructure of PWA films can be stable after removing templates apparently due to interactions between PWA and remained polymer chains. The samples were characterized by XRD, TEM, FT-IR, and TG-DTA.
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Takashi Kikukawa, Kazuhiro Kawabe, Koji Kuraoka, Tetsuo Yazawa, Kazuyu ...
Session ID: 1C28
Published: 2003
Released on J-STAGE: July 05, 2004
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Organic-inorganic hybrid ion conductive materials prepared from porous glass and organosilane compounds following oxidation of thiol function showed high conductivity at high temperature under high humidity.
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Kim Je-Dock, Itaru Honma
Session ID: 1C29
Published: 2003
Released on J-STAGE: July 05, 2004
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Polymer/Inorganic hybrid membranes of polydimethylsiloxane and zirconia have been synthesized by sol-gel processes. The membranes were found to be flexible and thermally stable up up 300 °C due to the nano-composite structures. The membranes become proton conducting electrolyte by doping of heteropolyacids such as 12-phosphotungstic acids (PWA) and possess conductivity of 7X10-5 S/cm at 150 °C under a saturated humidity.
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Jun-ichi Hamagami, Hiroshi Morikawa, Kiyoshi Kanamura
Session ID: 1C30
Published: 2003
Released on J-STAGE: July 05, 2004
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An electrode performance should be improved in order to realize a high energy efficiency of polymer electrolyte fuel cell (PEFC). In this study, an electrophoretic deposition (EPD) process was applied to membrane-electrode assembly (MEA) of PEFC. A catalyst layer consisting of carbon with Pt and ion exchange polymer was formed by the EPD under various conditions. Morphology and electrochemical properties of the prepared catalyst layer were examined to optimize conditions of the EPD process. The optimized EPD process provided a high electrode performance such as 500 mA cm-2 discharge current.
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Jun-ichi Hamagami, Toshinori Mitsui, Sei-ichi Suda, Kiyoshi Kanamura
Session ID: 1C31
Published: 2003
Released on J-STAGE: July 05, 2004
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Inorganic organic composite electrolyte membrane is desired to improve mechanical strength to suppress methanol cross-over. In this study three-dimensionally ordered macropours silica membrane was prepared from composite membrane consisting of colloidal silica and polystyrene beads followed by a heat treatment. A proton conductive gel-polymer was polymerized between pores to form inorganic-organic composite electrolyte. The obtained membrane exhibited 4.0X10
-2 S cm
-1 at 60°C under relative humidity of 80%.
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Kaori Kimura, Masaru Miyayama
Session ID: 1C32
Published: 2003
Released on J-STAGE: July 05, 2004
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β-FeOOH -carbon composites were prepared by mixing FeOOH and carbon powder in an aqueous solution, and lithium intercalation properties were examined. As the current densities become larger, the specific capacities become smaller. However, relatively large capacity of 90mAh/g was obtained at a high current density of 3A/g. The large capacities are assumed to be resulted from the uniform composite structure.
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Seiichi Suda, Nao Akutagawa, Toshinori Mitsui, Jun-ichi Hamagami, Kiyo ...
Session ID: 1C33
Published: 2003
Released on J-STAGE: July 05, 2004
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In order to create all solid-state rechargeable lithium battery with a high discharge capacity, a three-dimensional matrix consisting of solid electrolyte and active material has to be developed. In this study, we create Li0.35La0.55TiO3 ceramics with an inverse opal structure by colloidal templating method. Obtained polystyrene/Li-La-Ti-O gel composite was heated at 450°C and 1000 C. At 450°C, a desired three-dimensionally ordered macro-porous Li-La-Ti-O amorphous membrane was obtained. At 1000 °C, the obtained membrane had a perovskite structure.
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Seiichi Suda, Keisuke Shiraishi, Kiyoshi Kanamura
Session ID: 1C34
Published: 2003
Released on J-STAGE: July 05, 2004
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Phospho-olivine LiFePO
4 is a excellent candidate for the next generation of rechargeable lithium battery that is environmentally benign and inexpensive, In this study, we exploited the advantages of hydrothermal synthesis at low energy cost. To avoid oxidization of Fe
2+, LiFePO
4 was prepared with high purity FeSO
4 and ascorbic acid was added as reducer.
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Yong-Ho Rho, Jun-ichi Hamagami, Kiyoshi Kanamura
Session ID: 1C35
Published: 2003
Released on J-STAGE: July 05, 2004
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Li
4Ti
5O12 thin film anode for all solid-state rechargeable lithium batteries was prepared by using a sol-gel process, which has been developed by our group. The cell was constructed with lithium metal anode and solid electrolyte sheet to evaluate the prepared Li
4Ti
5O12 thin film electrode. The evaluation was performed with impedance analysis and cyclic voltammetry methods. Sharp redox peaks were observed at 1.55 V. The electrochemical impedance of this cell was also estimated to be 700 Ωcm
-2. From these results, it can be said that the Li
4Ti
5O
12 prepared directly on the solid electrolyte sheet works as anode material of all solid-state rechargeable lithium batteries with a high electrochemical performance.
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Aki Suzuki, Shaorong Wang, Takuya Hashimoto
Session ID: 1C37
Published: 2003
Released on J-STAGE: July 05, 2004
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La
0.6Sr
0.4Co
1-xGa
xO
3 was synthesized with solid state reaction method and analyzed with XRD. It was confirmed that a single phase can be obtained till x=0.4. The thermal expansion was obviously reduced for x≧0.3, whereas electrical conductivity as high as that of Sr doped lanthanum manganite was observed.
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Tatsuya Furuya, Makoto Yamaguchi, Masashi Yoshinaga, Shaorong Wang, Ta ...
Session ID: 1C38
Published: 2003
Released on J-STAGE: July 05, 2004
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Phase transition behavior of Ba
2In
<2-x>MxO
5 (M : rare earth, Y) was investigated by dilatometry, TG-DTA and quantitative DTA. It was revealed the transition temperature decreased with increase of ionic radii of substituted elements and contents of substitution.
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Takehisa Fukui, Hiroya Abe, Makio Naito, Kiyoshi Nogi
Session ID: 1C39
Published: 2003
Released on J-STAGE: July 05, 2004
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NiO-YSZ (Y
2O
3 stabilized ZrO
2) composite particles for Solid Oxide Fuel Cell (SOFC) was fabricated by mechanochemical bonding method. The processed powder achieved better homogeneity of NiO and YSZ particles, where submicron NiO particles were covered with finer YSZ particles. A Ni-YSZ cermet anode fabricated from the NiO-YSZ composite particles showed the homogeneous structure in which Ni and YSZ grains of less than several hundred nano-meter. The cermet anode achieved high electrical performance at low temperature operation (<800°C). It was led by larger electrochemical area successfully obtained by the excellent structure of the anode.
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Tatsuhiko Hirokawa, Masayuki Nagai
Session ID: 1C40
Published: 2003
Released on J-STAGE: July 05, 2004
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YSZ thin films were prepared by Ion beam sputtering. The surfaces of sputtered films were examined using AFM and SEM. They had microscopically flat surfaces. The surface smoothness was depended on the state of the substrate. When they were sputtered with a beam current of 55mA for 2 hours, the films had a thickness of 500nm which was determined by the SEM observation.
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Junichi Nishinosono, Masamitsu Imai, Toyohiko Yano
Session ID: 1D07
Published: 2003
Released on J-STAGE: July 05, 2004
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Fabrication of pollucite ceramics was investigated. The mixture was prepared from a combination of Al2O3 sol, SiO2 sol and CsNO3 starting materials by sol-gel processing. Milled powder of the mixture was pressed and CIPed into pellets at 100, 150MPa, and sintered at temperatures from 1400°C to 1600°C for 6h. Single phase pollucite ceramics was obtained by CIPing at 150MPa, and sintering at 1500°C. The resulting sitered ceramics had densities about 68% of theoretical density.
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Hiroyuki Tanaka, Osamu Ohashi, Norio Yamaguchi
Session ID: 1D08
Published: 2003
Released on J-STAGE: July 05, 2004
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Sintering hydroxyapatite (HA) powder, it should be noted the decomposition of HA. In pulse electric current sintering (PECS), a densification attains at lower temperature and shorter time than the conventional sintering techniques, because an electric current flows directly in the specimen. In this study, a sintering behavior of CO32- -containing HA powder in PECS was investigated by measuring evolved gases, compared with thermal analysis. While the CO2 gas was evolved at 600°C in the thermal analysis, it was evolved at two points of 500°C and 600°C in PECS. HA particles surface would be partially hot due to contact resistance in PECS. From the temperature measurement of dies and HA in PECS, it was found that temperature of HA became higher than that of dies.
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Ryouta Kobayashi, Hisayuki Suematsu, Tsuneo Suzuki, Weihua Jiang, Kiyo ...
Session ID: 1D11
Published: 2003
Released on J-STAGE: July 05, 2004
CONFERENCE PROCEEDINGS
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Synthesis of carbon nanotubes (CNT) was attempted by pulsed wire discharge in nitrogen atmosphere. We succeeded in the synthesis of CNT using nickel electrodes as a catalyst. During the discharge of the carbon wire, the nickel electrodes were also evaporated to form nickel particles, which may act as catalyst to synthesize single wall carbon nanotubes (SWCNT). We have found SWCNT of about 1.5 nm in inner diameter.
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Hisayuki Suematsu, Masahiro Kumagai, Tsuneo Suzuki, Weihua Jiang, Kiyo ...
Session ID: 1D12
Published: 2003
Released on J-STAGE: July 05, 2004
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Nickel nanosized powder covered by an organic film was prepared by pulsed wire discharge. Thin metallic Ni wire was discharged in a chamber filled with organic fumes and N
2gas at 100-600 Torr. Nanosized powder was collected by evacuating the chamber through a filter. X-ray diffraction patterns indicate that the main phase in the powder was Ni and was not oxidized for 3 days in air.
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Chuhyun Cho, Keiiti Murai, Hisayuki Suematsu, Tsuneo Suzuki, Weihua Ji ...
Session ID: 1D13
Published: 2003
Released on J-STAGE: July 05, 2004
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In this research, nanosized powders of copper were synthesized by pulsed wire discharge at 100 Torr and 800 Torr of nitrogen gas. And the particle size distributions of the powders were evaluated by SEM observations. The results showed that the particle diameters of peak counts were 30 nm and 45 nm at pressures of 100 Torr and 800 Torr, respectively. However, the number of submicrometer-sized particles was fewer in the powder synthesized at 800 Torr than that at 100 Torr. The energy deposition in the wire was 38 J at 100 Torr, and 52 J at 800 Torr, respectively. Even though discharge energy was 135 J, which is twice of energy then required for vaporizing the wire (∼67 J) , the energy deposition at both pressures were lower than the vaporization energy.
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Kiyoshi Ozawa, Hideo Okuyama, Masahiro Uda, Junhu Wang, Jinhua Ye, Yos ...
Session ID: 1D27
Published: 2003
Released on J-STAGE: July 05, 2004
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Tungsten and molybdenum oxides and their composites were synthesized by an arc plasma method using W and Mo metals and their alloys as starting materials. It is realized that fine particles with a relatively uniform particle size of about 50 nm can be prepared for the WO
3 and MoO
3 products. In addition, the Mo
1-xW
xO
3 compound is obtained as a single phase for tungsten and molybdenum oxide composites. For the obtained powders, photocatalytic properties were investigated compared with those for the commercial powders.
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Masami Sugasawa, Nobuyuki Kikukawa, Naoyuki Kayano, Takayasu Kimura
Session ID: 1D28
Published: 2003
Released on J-STAGE: July 05, 2004
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We synthesized ultra-fine particles that contained
xO1.5(1+x)(R: rare earth elements) using ICP evaporation method. RFexO1.5(1+x) are new compounds that have not been registered in JCPDS. When we used Y,Yb, Er, Ho, Dy, Gd and Eu for R in precursors, we obtained the ultra-fine particles that contained RFexO1.5(1+x) However, in the cases of Sm and Nd, we could not confirm the presence of RFexO1.5(1+x) in the products. From these resutts, we elucidated that RFexO1.5(1+x) could be synthesized in the optimum range of R ionic radius.
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Keigo Suzuki, Kazunori Kijima, Arifumi Okada, Hiroshi Yamamoto, Yukio ...
Session ID: 1D29
Published: 2003
Released on J-STAGE: July 05, 2004
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RF-plasma CVD method is one of the most useful methods for preparing ceramic nanoparticles. BaTiO
3 nanoparticles were synthesized by this method using metalorganic sources as raw materials. Perovskite type BaTiO
3 phase was confirmed by XRD as major products. The particle size of BaTiO
3/ nanoparticles was about 15nm, and they were well crystallized.
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Junichi Nishino, Nosaka Yoshio
Session ID: 1D30
Published: 2003
Released on J-STAGE: July 05, 2004
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ZnO films were prepared by a nearby sublimation chemical vapor deposition method at low substrate temperature using bis(2,4-pentanedionato)zinc [Zn(C
5H
7O
2)
2] as a source material. C-axis preferred orientation of the ZnO were obtained at distance of substrate to source surface; D=2.5 mm and substrate temperatures; T
s=100 and 150°C.
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Naofumi Uekawa, Ryo Yamashita, Kazuyuki Kakegawa
Session ID: 1D31
Published: 2003
Released on J-STAGE: July 05, 2004
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0.1mol/l of an aqueous solution of zinc nitrate and 1.5 mol/l of an aqueous solution of base were mixed and a tetra hydroxyl zinc acid solution was obtained. The crystallized zinc oxide particles were obtained by the heating of the zinc acid aqueous solution at 95°C for 3h. The shape of the obtained ZnO particles depended on the cation in the base. The rate of precipitation of ZnO particle from the aqueous solution also depended on the base. The precipitation rate increased with an oncrease of the ionic radius of the cation in the base.
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Yasuo Iida, Teruyuki Kozuka, Toru Tuziuti, Kyuichi Yasui
Session ID: 1D32
Published: 2003
Released on J-STAGE: July 05, 2004
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The sonochemical effects on the film deposition reaction of ZnO from aqueous ammonia solutions have been investigated controlling the temperature, pH, and solute concentrations and the ultrasonic conditions. The heterogeneous nucleation and deposition of Zn(OH)2 on a glass plate were achieved during the sonication. By heat treatment at 200°C, the Zn(OH)2 could be transformed into ZnO. Direct deposition of ZnO was also observed in the other conditions. However, it needed the prolonged immersion period after the sonication for a few days.
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Hirokazu Kawaoka, Mitsuhiro Hibino, Hao-shen Zhou, Itaru Honma
Session ID: 1D33
Published: 2003
Released on J-STAGE: July 05, 2004
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Acetylene black coated with amorphous manganese oxide for rapid-dischargeable battery was synthesized by sonochemical method. Acetylene black was homogeneously covered with amorphous manganese oxide. In MnO4
- solution without acetylene black, MnO4- did not reduced by ultrasound. These experimental results exhibit that this reduction reaction must be highly related to the presence of acetylene black.
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Naoya Enomoto, Hohjun Miyajiama, Masato Uehara, Junichi Hojo
Session ID: 1D34
Published: 2003
Released on J-STAGE: July 05, 2004
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Production of carbon nanoparticles from benzene-derivatives in an ultrasound field have been studied. In the presence of zinc compounds as a coexistent particles, the raw material liquid showed a marked darkning due to the occurrence of polymerization. Especially, addition of zinc, zinc chloride, zinc nitrate dramatically promoted the polymerization, and carbon nanoparticles were producted. We confirmed nanotubes, flake-like particles, amorphous and so on by SEM and TEM observations.
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Tomoharu Nakayama, Tetsuhide Fujita, Toshikazu Kusano, Kimiko Kujiraok ...
Session ID: 1D35
Published: 2003
Released on J-STAGE: July 05, 2004
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Au particles were prepared by the ultrasonic irradiation of a mixed solution of HAuCl4, polyvinyl alcohol (PVA), and ethylene glycol (EG). After the irradiation, the surface plasmon resonance absorption peak of Au particles at 520 nm was clearly observed in the absorption spectra of the solutions. The nanometer sized Au particles were stable more than 3000 h in the solution.
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Miki Inada, Masato Uehara, Naoya Enomoto, Junichi Hojo
Session ID: 1D36
Published: 2003
Released on J-STAGE: July 05, 2004
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In this study, we tried to synthesize TiO
2 particle by hydrolysis of TiOSO
4 solution using the domestic microwave oven. Microwave irradiation was controlled by the measurement of temperature in the reaction system using the optical fiber. By microwave-heating method, the precipitate formed after 2-6min, which was earlier than the case of conventional refluxing method. This result indicates that the hydrolysis of TiOSO
4 was promoted by microwave irradiation. The XRD pattern of the product showed the week peaks of anatase phase. The particle size of product was 100-500nm and the particle was aggregated.
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Takao Tani, Hideaki Morisaka, Naoyoshi Watanabe, Kazumasa Takatori
Session ID: 1D37
Published: 2003
Released on J-STAGE: July 05, 2004
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Pure and mixed ZnO and SiO2 particles were made by flame spray pyrolysis (FSP). Gas phase reaction took place when using hexamethyldisiloxane (HMDSO) as Si precursor, forming nanoparticles, whereas the SiO2 sol used as Si precursor was not evaporated in the flame, creating spherical aggregates of the sol particles (e.g. 1 μm). The FSP of zinc acetate (ZA) produced ZnO nanoparticles. The FSP of HMDSO and ZA led to intimate gas phase mixing of Zn and Si, suppressing each other's particle growth, forming nanoparticles. Nucleation of ZnO and SiO2 occurred independently by FSP of the SiO2 sol and ZA, resulting a ZnO and SiO2 mixture.
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Kazutoshi Akiyama, Nobuo Kieda
Session ID: 1D38
Published: 2003
Released on J-STAGE: July 05, 2004
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Ethyleneglycolates of Fe, Ni and Cu were synthesized and them mixed with TEOS to prepare homogeneous solutions. The solutions were diluted by acetone and sprayed ultrasonically. The mist was carried by N2 into a reactive tube heated at 100-800°C and pyrolyzed to form product particles. Although the as-prepared particles contained many undecomposed species, metal nano particles dispersed silica micro spheres could be obtained by post-annealing at 700-900°C in N2-H2 stream.
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Masaaki Nagashima, Tadachika Nakayama, Tomoaki Sawada, Masaki Fujika, ...
Session ID: 1D39
Published: 2003
Released on J-STAGE: July 05, 2004
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Metastable ZrO2-xnano-particles were successfully prepared by the IGC process. To introduce oxygen vacancies into particles, they were annealed at temperatures between 100°C and 400°C for 2 h under low-oxygen partial pressures (Po2=10-15Pa). Therefore, ZrO2-x particles had various oxygen vacancies (0.26
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