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Characterization of Polycrystalline nickel cobaltite Nanostructures Prepared by DC Plasma Magnetron Co-Sputtering for Gas Sensing Applications

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Photonic Sensors 2018年第1期8卷 43-47页

作者： Oday A. HAMMADI Noor E. NAJI Department of Physics College of Education Al-Iraqia University Baghdad 12001 Iraq School of Applied Sciences University of Technology Baghdad 35010 Iraq

In this work, a gas sensor is fabricated from polycrystalline nickel cobaltite nano films deposited on transparent substrates by closed-field unbalanced dual-magnetrons （CFUBDM） co-sputtering technique. Two targets of nickel and cobalt are mounted on the cathode of discharge system and co-sputtered by direct current （DC） argon discharge plasma in presence of oxygen as a reactive gas. The total gas pressure is 0.5 mbar and the mixing ratio of Ar：O2 gases is 5：1. The characterization measurements performed on the prepared films show that their transmittance increases with the incident wavelength, the polycrystalline structure includes 5 crystallographic planes, the average particle size is about 35nm, the electrical conductivity is linearly increasing with increasing temperature, and the activation energy is about 0.41 eV. These films show high sensitivity to ethanol vapor.

关键词： nickel cobaltite magnetron sputtering reactive sputtering gas sensing

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NiCo2O4 decorated PANI–CNTs composites as supercapacitive electrode materials

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Journal of Energy Chemistry 2017年第1期26卷 175-181页

作者： Gunjana Chaudhary Ashok K.Sharma Preetam Bhardwaj Kamal Kant Indu Kaushal Ajay K.Mishra Thin Film Laboratory Department of Materials Science and NanotechnologyDeenbandhu Chhotu Ram University of Science and TechnologyMurthal 131039India Nanotechnology and Water Sustainability Research Unit College of ScienceUniversity of South AfricaUnisa Science CampusJohannesburgSouth Africa

Hierarchical Ni CoO/PANI/CNTs hybrid composites were designed and fabricated having a layer of Ni CoOon the surface of PANI encapsulated CNTs with different morphologies. Physicochemical attributes of the synthesized composites were examined by FTIR, UV–visible and X-ray diffraction（XRD）techniques. Morphological aspects were evaluated by field-emission scanning microscopy（FESEM）,electron diffraction spectroscopy（EDS）, high resolution transmission electron microscopy（HRTEM） and selected area electron diffraction（SAED） studies. Electrochemical measurements revealed an improved specific capacitance of 2250 F/g at a scan rate of 5 m V/s and 2000 F/g at a current density of 1 A/g with good rate capability using a three-electrode system. These enhanced features are achieved from the well designed nanostructure and the synergistic contributions of individual components in the electrode material.

关键词： Polyaniline Carbon nanotubes nickel cobaltite Supercapacitor

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