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Song J.,Inner Mongolia University of Science and Technology | Zhou Z.,Inner Mongolia China Coal Mengda New Energy Chemical Industry Base Development Co. | Wu Y.,Inner Mongolia University of Science and Technology | Cai Y.,Inner Mongolia University of Science and Technology
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2015

The ZnO powder and a series of ZnO powders doped with erbium(ZnO:x%Er) were prepared by low temperature hydrothermal methods. X-ray diffraction analyses showed that the prepared samples were hexagonal wurzite structures and erbium was chemically doped in ZnO crystal lattice as trivalent ions. Scanning electron microscope measurements exhibited the prepared samples were two dimensional sheet-shapes. The obtained samples were composed of Zn, O and Er elements, characterized by energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The gas sensing results showed that the ZnO:3%Er exhibited better sensitivity towards dimethylamine, and the sensitivity obtained 106.51×10-6 to 100×10-6 dimethylamine at 300℃. The sensitivity of ZnO:3%Er towards dimethylamine exhibited excellent stability and short response-recovery time, and the response time was 6 s, and the recovery time was 11 s. In the atmosphere of amine, ZnO:3%Er displayed outstanding selectivity towards dimethylamine. The excellent gas sensing properties of ZnO:3%Er were possibly related to Er3+ with high oxide-storage property on the surface. ©, 2015, Editorial Office of Journal of the Chinese Society of Rare Earths. All right reserved. Source


Song J.-L.,Inner Mongolia University of Science and Technology | Zhou Z.-C.,Inner Mongolia China Coal Mengda New Energy Chemical Industry Base Development Co. | Mou L.-W.,Inner Mongolia China Coal Mengda New Energy Chemical Industry Base Development Co. | Guo G.-M.,Inner Mongolia University of Science and Technology | And 2 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2013

TiO2 and TiO2 powders doped with different rare earth ions were prepared by sol-gel method, and their structures characterized by XRD. The results indicate that the prepared TiO2 powder has anatase structure, and rare earth ion doping can restrain the growth of TiO2 crystals. Moreover, its gas sensing properties towards formaldehyde, toluene and acetone gases were measured by a gas sensing instrument. The results show that the TiO2 doped with Ce (TiO2:Ce) exhibits better sensitivity and selectivity towards those gases, which may be attributed to the enhanced capability of adsorbed oxygen on the surface of Ce-doped TiO2. TEM analysis shows that the morphology of TiO2:Ce powder is particles with the diameters of 5~12 nm. Source


Song J.-L.,Inner Mongolia University of Science and Technology | Guo G.-M.,Inner Mongolia University of Science and Technology | Zhou Z.-C.,Inner Mongolia China Coal Mengda New Energy Chemical Industry Base Development Co. | Mou L.-W.,Inner Mongolia China Coal Mengda New Energy Chemical Industry Base Development Co. | And 2 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2013

SnO2 and rare earth-doped SnO2 powders were prepared by hydro-thermal method, and their structures and gas sensing properties characterized by XRD and gas sensing instrument, respectively. The results show that the prepared SnO2 powder exhibits tetragonal rutile structure and rare earth ions doping do not change its crystalline structure without formation of new phases. SnO2:La exhibits better sensitivity towards ethanol. The gas sensing mechanism is analyzed. In addition, the corresponding sensitivity of SnO2:La increases with increasing of ethanol concentration and fluctuates with rising of temperature. The sensitivity of SnO2:La towards 1.00 × 10-4 ethanol obtains 101.1 at 250°C, which is the best. The response time and recovery time are about 5 s under the condition. Source

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