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Electrical property of 8-mol% yttria-stabilized zirconia electrolyte by spark-plasma sintering

Science China(Technological Sciences) 2004年第5期47卷 569-576页

作者： JIAN Jiawen1,2, CHANG Aimin3, YANG Bangchao2 & ZHANG Yikang4 1. The School of Information Science Engineering, Ningbo University, Ningbo 315211, China 2. The School of Microelectronics and Solid-state Electronics, University of Electronic Science and Tech-nology of China, Chengdu 610054, China 3. The Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830022, China 4. Hongtak (Chengdu) Electronic Co., Ltd, Chengdu 610041, China Correspondence should be addressed to Jian Jiawen The School of Information Science Engineering Ningbo University Ningbo China The School of Microelectronics and Solid-state Electronics University of Electronic Science and Technology of China Chengdu China The Xinjiang Technical Institute of Physics and Chemistry Chinese Academy of Sciences Urumqi China Hongtak (Chengdu) Electronic Co. Ltd Chengdu China

Spark-plasma sintering (SPS) process was used to sinter ZrO2 (8Y) powders, and a relative density of 99% has been reached at a low temperature (1350°C) and short dwelling time (10 min) compared to the conventional sintered identical samples (1450°C 4 h)(CS). By the X-ray diffraction (XRD) patterns, the microstructure of the SPS pellet and CS pellet are both indexed by the cubic unit cell (Fm3m). The finer crystallite size (D111) of the SPS pellet is 154 nm and D111 of the CS pellet is more than 1 μm. The AC impedance.spectroscopy shows that the ionic conductivity of SPS pellet is different from that of CS pellet. The activation energy for the SPS ceramics, estimated from the slope in the range of 400–800°C, was 91 kJ mol?1, which is in good agreement with CS pellet (96 kJ mol?1), indicating that the conduction mechanism in SPS ceramics is similar to that in CS ceramics.

关键词： yttria-stabilized zirconia electrolyte, spark-plasma sintering, AC impedance.

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Amperometric Nitrous Oxide Gas Sensor： Preparation ol Cu/PANI/Cu Electrodes and Sensing Behavior

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Journal of Environmental Science and Engineering(B) 2012年第12期1卷 1297-1302页

作者： Luisa Quifiones-Montenegro Eduardo Herrera-Peraza Carmen Navarro B. Trujillo-Navarrete Yadira Gochi Laura Ortega Department of Environment and Energy Research Center for Advanced MaterialsMdxico Chihuahua 31000 Graduate Department Technological Institute of OaxacaMdxico Oaxaca 68000 Department of Basic Science Technological Institute of Chihuahua II. Chihuahua MexicoChihuahua 31000

The authors studied the changes in the electrical properties of PANI （polyaniline） when exposed to the presence of N20 （nitrous oxide）. The techniques used to determine the adsorption of gas in the polymer were the electrochemical impedance. steps voltammetry and transmission electron microscopy. The objective of this work was to determine the ability of adsorption and desorption of PANI to be used as sensor in an open environment. Measurements were performed in a controlled atmosphere, temperature and flux. The gas was passed through a glass capsule in which an electrochemical cell was designed with copper electrodes and PANI as electrolyte. The change in electrical properties of the material is analyzed using a potentiostat/galvanostat in situ. Subsequently, the material was analyzed by TEM （Transmission Electron Microscopy） elemental analysis. The measurements were performed with difl^rent concentrations of N20 with a purity of 99%. As a result of measurements, it was found that the change in electrical resistance of PANI is caused by the physical interaction that occurs when in contact with NzO and even a change in the morphology of polymer, however, the binding is weak and sufficient to increase the temperature at which 25% PANI film regains its original properties.

关键词： Polymer electrochemical gas sensor nitrous oxide impedance.

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