Monodispersed ZnSnO3 microspheres are successfully prepared via a facile microwave-assisted method together with subsequently calcination treatment.Powder X-ray diffraction(PXRD)results indicate that the structure of ...Monodispersed ZnSnO3 microspheres are successfully prepared via a facile microwave-assisted method together with subsequently calcination treatment.Powder X-ray diffraction(PXRD)results indicate that the structure of the products shifted from crystalline to amorphous under high-tempe rature treatments.Field emission scanning electron microscope(FESEM)and the transmission electron microscope(TEM)observations demonstrate that the as-obtained products are composed of uniform microspheres with rough surfaces and the mean diameter is measured as-700 nm.Moreover,the morphology of ZnSnO3 microspheres can be well controlled by adjusting the ratio of Zn2+and Sn4+.The gas sensing properties of ZnSnO3 microspheres with different ratios of Zn2+/Sn4+are investigated.Our results indicate that the ZnSnO3 microspheres exhibit good selectivity and high sensitivity towards ethanol at the optimum working temperature of 230℃.When the sensor is exposed 50 ppm ethanol,the value of response is 47 and the response/recovery times are 11 s and 12 s,respectively.展开更多
Transparent conductive oxide ZnSnO3 films were prepared by radio-frequency magnetron sputtering from powder targets and were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron ...Transparent conductive oxide ZnSnO3 films were prepared by radio-frequency magnetron sputtering from powder targets and were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, atomic force microscopy, surface profile, UV-Vis spectroscopy, and Hall effect. The structures of the films were either amorphous or nanocrystalline depending on sputtering parameters including deposition time, target power, chamber pressure, and the target-substrate separation. The average transmittance of the ZnSnO3 films within the visible wavelength was approximately 80% and the resistivity of the ZnSnO3 films was in the range of 10^-3-10^-4 Ω cm. The structural, optical, and electrical properties of the ZnSnO3 films could be adjusted and regulated by optimizing the sputtering process, allowing materials with specific properties to be designed.展开更多
为了提高ZnSnO3的氢敏性能,以共沉淀法制备ZnSnO3并对其进行了贵金属Pd2+掺杂.采用X射线衍射仪(X-ray diffraction,XRD)及透射电镜(transmission electron microscopy,TEM)对制备的气敏材料进行结构及形貌表征,并使用静态配气法测试了...为了提高ZnSnO3的氢敏性能,以共沉淀法制备ZnSnO3并对其进行了贵金属Pd2+掺杂.采用X射线衍射仪(X-ray diffraction,XRD)及透射电镜(transmission electron microscopy,TEM)对制备的气敏材料进行结构及形貌表征,并使用静态配气法测试了掺杂前后ZnSnO3的氢敏性能.结果表明:掺杂Pd2+可显著提高ZnSnO3的氢敏性能.在工作温度为240℃、浓度为300×10-6的条件下,Pd2+掺杂纳米ZnSnO3对氢气的灵敏度为12,是未掺杂时的3倍.基于第一性原理探讨气敏机理,计算结果表明:Pd2+掺杂改变了ZnSnO3能带间的电子运动状态,使ZnSnO3费米能级由0.725 eV移动到1.035 eV,在费米能级附近产生新的电子峰,使其电导性能在气敏反应过程中改变更为明显.Pd2+掺杂还使ZnSnO3表面吸附氧的能力显著增加,对提高氢敏性能起到了关键作用.展开更多
基金supported by National Nature Science Foundation of China(Nos.61671284 and U1704255)。
文摘Monodispersed ZnSnO3 microspheres are successfully prepared via a facile microwave-assisted method together with subsequently calcination treatment.Powder X-ray diffraction(PXRD)results indicate that the structure of the products shifted from crystalline to amorphous under high-tempe rature treatments.Field emission scanning electron microscope(FESEM)and the transmission electron microscope(TEM)observations demonstrate that the as-obtained products are composed of uniform microspheres with rough surfaces and the mean diameter is measured as-700 nm.Moreover,the morphology of ZnSnO3 microspheres can be well controlled by adjusting the ratio of Zn2+and Sn4+.The gas sensing properties of ZnSnO3 microspheres with different ratios of Zn2+/Sn4+are investigated.Our results indicate that the ZnSnO3 microspheres exhibit good selectivity and high sensitivity towards ethanol at the optimum working temperature of 230℃.When the sensor is exposed 50 ppm ethanol,the value of response is 47 and the response/recovery times are 11 s and 12 s,respectively.
基金financially supported by the National Natural Science Foundation of China (Nos. 51372109 and 51502126)the Foundation of Educational Department of Liaoning (No. L2015260)the Open Subject of Key Laboratory Liaoning Province (No. USTLKFSY201501)
文摘Transparent conductive oxide ZnSnO3 films were prepared by radio-frequency magnetron sputtering from powder targets and were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, atomic force microscopy, surface profile, UV-Vis spectroscopy, and Hall effect. The structures of the films were either amorphous or nanocrystalline depending on sputtering parameters including deposition time, target power, chamber pressure, and the target-substrate separation. The average transmittance of the ZnSnO3 films within the visible wavelength was approximately 80% and the resistivity of the ZnSnO3 films was in the range of 10^-3-10^-4 Ω cm. The structural, optical, and electrical properties of the ZnSnO3 films could be adjusted and regulated by optimizing the sputtering process, allowing materials with specific properties to be designed.
