The Effect of Eu Doping on Microstructure, Morphology and Methanal-Sensing Performance of Highly Ordered SnO₂ Nanorods Array.
The Effect of Eu Doping on Microstructure, Morphology and Methanal-Sensing Performance of Highly Ordered SnO₂ Nanorods Array.
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Eu掺杂对高度有序SnO2纳米棒阵列微结构、形貌和甲烷传感性能的影响
DOI：
10.3390/nano7120410
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发表时间：
2017-11-23
期刊：
影响因子：
--
通讯作者：
Zhao H
中科院分区：
文献类型：
--
作者：
Zhao Y;Li Y;Ren X;Gao F;Zhao H
采用锡酸钠和氢氧化钠的醇水混合溶剂，在200 ℃下通过无基质水热法合成了由直径10 nm、长度数百纳米的纳米棒构建的层状Eu掺杂SnO2有序纳米阵列。 Eu 掺杂剂充当晶体生长抑制剂，阻止 SnO2 纳米棒生长，从而形成脆弱的 SnO2 纳米棒有序阵列。 X射线衍射（XRD）显示出四方金红石型结构，具有系统的平均尺寸减小和晶胞体积膨胀，同时随着Eu掺杂含量的增加而增加了残余应变。通过高分辨率透射电子显微镜（HRTEM）观察了由于Eu离子掺入表面氧化物基体而引起的表面缺陷。基于不同浓度Eu掺杂SnO2层状纳米阵列的传感器的响应特性结果表明，0.5at%Eu掺杂SnO2层状纳米棒阵列在278℃下对甲醛表现出优异的传感响应。从Eu掺杂剂复杂的缺陷表面结构、大的比表面积和优异的催化性能等方面讨论了传感性能增强的原因。
Layered Eu-doped SnO2 ordered nanoarrays constructed by nanorods with 10 nm diameters and several hundred nanometers length were synthesized by a substrate-free hydrothermal route using alcohol and water mixed solvent of sodium stannate and sodium hydroxide at 200 °C. The Eu dopant acted as a crystal growth inhibitor to prevent the SnO2 nanorods growth up, resulting in tenuous SnO2 nanorods ordered arrays. The X-ray diffraction (XRD) revealed the tetragonal rutile-type structure with a systematic average size reduction and unit cell volume tumescence, while enhancing the residual strain as the Eu-doped content increases. The surface defects that were caused by the incorporation of Eu ions within the surface oxide matrix were observed by high-resolution transmission electron microscope (HRTEM). The results of the response properties of sensors based on the different levels of Eu-doped SnO2 layered nanoarrays demonstrated that the 0.5 at % Eu-doped SnO2 layered nanorods arrays exhibited an excellent sensing response to methanal at 278 °C. The reasons of the enhanced sensing performance were discussed from the complicated defect surface structure, the large specific surface area, and the excellent catalytic properties of Eu dopant.
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DOI：
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发表时间：
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