Papers by Keyword: NiO

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Authors: Kentaro Kinoshita, Tatsuya Makino, Takatoshi Yoda, Kazufumi Dobashi, Satoru Kishida
Abstract: Both a low and a high resistance states which were written by the voltage application in a local region of NiO/Pt films by using conducting atomic force microscopy (C-AFM) were observed by using scanning electron microscope (SEM) and electron probe micro analysis (EPMA). The writing regions are distinguishable as dark areas in a secondary electron image and thus can be specified without using complicated sample fabrication process to narrow down the writing regions such as the photolithography technique. In addition, the writing regions were analyzed by using energy dispersive X-ray spectroscopy (EDS) mapping. No difference between the inside and outside of the writing regions is observed for all the mapped elements including C and Rh. Here, C and Rh are the most probable candidates for contamination which affect the secondary electron image. Therefore, our results suggested that the observed change in the contrast of the secondary electron image is related to the intrinsic change in the electronic state of the NiO film and a secondary electron yield is correlated to the physical properties of the film.
Authors: J. Suresh, R. Yuvakkumar, A. Joseph Nathanael, M. Sundrarajan, Sun Ig Hong
Abstract: We report an antibacterial and wash durability behaviour of MgO and NiO nanoparticles treated cotton fabric using sodium alginate as cross linker. The metal oxide nanoparticles treated cotton fabric using sodium alginate as a crosslinker was characterized employing SEM-EDX and their antibacterial activity was analyzed. The enhanced zone of inhibition and wash durability behaviour was observed for NiO nanoparticles treated fabric. However, MgO nanoparticles showed less significant antibacterial and wash durabilty activities when compared to NiO nanoparticles treated cotton fabrics.
Authors: Zhi Chen, Yi Long Xie, Jin Xing Qiu, Zhong He Chen
Abstract: ZrO2 support has been prepared by sol-gel and coprecipitation method. CuO and NiO were supported on the supports and they were the activity metals for the catalysts. The CO conversion was tested. The light-off temperature of CO oxidation was 22°C and CO conversion efficiency was up to 50% at 169°C. The prepared catalysts of Cu, Ni supported on ZrO2-A had a high activity for CO oxidation at low temperature.
Authors: Bo Ping Zhang, Jing Feng Li, Li Min Zhang, Jun Zeng, Yan Dong
Abstract: Lithium and titanium co-doped NiO ceramics have been found to exhibit a giant low-frequency dielectric constant (ε~105), however, the same system thin films is not yet study. In the present study, Lithium and titanium co-doped NiO thin films were prepared by a chemical solution deposition method using 2-methoxyethanol as a solvent, nickel actate tetrahydrate, lithium acetate dihydrate and titanium isopropoxide as starting materials. The complex oxides such as NiO, Ni0.2O0.8 and NiTiO3 were formed for the Ni0.98Ti0.02O and Ni0.686Li0.294Ti0.02O thin films, and the addition of the lithium lead to the formation of Li2NiO2.888. The dielectric constant of Lithium and titanium co-doped Ni0.686Li0.294Ti0.02O thin films is about 426 at 100 Hz and much higher than that of the titanium-doped Ni0.98Ti0.02O.
Authors: Darren Simpson, Thomas Bredow, Andrea R. Gerson
Authors: G. Calvarin-Amiri, Régine Molins, Anne Marie Huntz
Authors: Li Yang, Wie Sheng Guan, Bo Bai, Yun Xiang
Abstract: A novel route for synthesis of biomorphic nickel oxide (NiO) hollow microspheres, using yeasts as bio-templates, has been successfully developed. In the typical process,yeast cells were first coated with nickel hydroxide and then calcinated to obtain nickel oxide hollow microspheres. As-prepared products were characterized by DTA, SEM, XRD and FTIR. A possible formation mechanism of NiO hollow microspheres was proposed in brief.
Authors: Jian Fei Wang, Yuan Hua Lin, Yu Chen, Lei Jiang, Ce Wen Nan
Abstract: NiO-NiTiO3 composite ceramics were prepared by the conventional solid state reaction process and dielectric properties were investigated as a function of frequency and temperature. The results indicate that all samples showed high dielectric constant ~103 at 0.1 kHz, but a remarkable decrease of the dielectric loss appeared when the volume fraction of NiTiO3 phase reached 42.4%. Relaxor-like peaks were observed in the temperature dependence of the dielectric constant with ceramics having low composition of NiTiO3 phase (≤21.2%). The possible response mechanism associated with the microstructure and the associated defects of the composites was discussed.
Authors: Aishah Syed Salim Sharifah, Julie Juliewatty Mohamed, Zainal Arifin Ahmad
Abstract: ZrxNi1-xO was prepared by conventional solid state reaction. The properties of undoped and ZrO2 doped NiO ceramics have been studied. The raw mixture of ZrO2 and NiO were ball milled for 24 hours. The samples were calcined at 1000°C for 2 hours, pressed into pellet shape at 200 MPa and sintered at 1300°C for 10 hours. The sintered samples were subjected to XRD, Scanning Electron Microscopy (SEM) and Impedance Analyzer for phase identification, microstructural observation and dielectric analysis. The grains size decrease with the increment of dopant amount. Enhanced dielectric constant was observed in the ZrO2 doped NiO with x= 0.02 for the frequency range from 1MHz to 1GHz. The dielectric constant of sintered ZrxNi1-xO decreased with an increasing frequency. The result indicates that Zr ions have effectively changed the dielectric properties of NiO.Keywords: NiO, Zr-doped, XRD, SEM, Dielectric.
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