Electrospinning synthesis, crystal structure, and ethylene glycol sensing properties of orthorhombic SmBO3 (B=Fe, Co) perovskites
Electrospinning synthesis, crystal structure, and ethylene glycol sensing properties of orthorhombic SmBO3 (B=Fe, Co) perovskites
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正交晶系SmBO3 (B=Fe, Co)钙钛矿的静电纺丝合成、晶体结构和乙二醇传感性能
DOI：
10.1016/j.jallcom.2021.160211
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发表时间：
2021-05
影响因子：
6.2
通讯作者：
Pei Shitu
中科院分区：
文献类型：
--
作者：
Han Ting;Ma Shuyi;Xu Xiaohui;Cao Pengfei;Liu Wangwang;Xu Xiaoli;Pei Shitu
本工作的目的是考察SmBO_3钙钛矿中不同的B(B双键，Fe，Co)位对晶体结构和乙二醇气敏性能的影响。为此，采用一种简单高效的电纺技术制备了SmFeO_3和SmCoO_3纳米纤维的正交相样品，并在700 °C下焙烧，用X射线衍射法对样品进行Rietveld修正和容差因子(T)分析，通过晶格参数、B单键尺寸、单键角和T值来研究样品的晶体结构，BET测试表明两种样品具有不同的孔径大小，XPS分析了两种样品的成分和化学状态，表明SmFeO_3表面存在更多的氧空位。然后，比较了SmFeO_3和SmCoO_3纳米纤维在200 °C的最佳工作温度下的气敏性能。气敏研究表明，基于SmFeO_3纳米纤维的传感器对100 ppm乙二醇气敏响应(14.3)几乎是SmCoO_3(2.2)的6.5倍。最后，从孔径大小、氧空位、晶格扭曲和电导等方面对SmFeO_3和SmCoO_3纳米纤维的传感机理进行了解释。
The target of this work is to survey the consequences of various B (Bdouble bondFe, Co) sites of SmBO3perovskite on crystal structure and ethylene glycol gas-sensitive properties. To this end, two samples based on SmFeO3and SmCoO3nanofibers with orthorhombic phase were prepared by a straightforward and efficient electrospinning technique and calcined at 700 °C. The XRD Rietveld refinements and tolerance factor (t) were implemented to research the crystal structure by the lattice parameters, size of Bsingle bondOsingle bondB angles andtvalue, BET test shows that as-prepared two samples own different pore sizes, and XPS analyzes the composition and chemical state toward two samples, which indicates that more oxygen vacancies exist in SmFeO3surface. Then, the gas-sensing performance of SmFeO3and SmCoO3nanofibers were compared at their optimal working temperature of 200 °C. The gas-sensing inquiries exhibit that the response of sensor based on SmFeO3nanofiber (14.3) is almost 6.5 times higher than that of SmCoO3(2.2) toward 100 ppm ethylene glycol. Finally, the sensing mechanisms of SmFeO3and SmCoO3nanofibers were also explained based on pore size, oxygen vacancy, lattice distortion and electrical conductance.
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