Modification of Ce valence states by Y/Dy co-doping of CeO2 nanoparticles for effective Electrical and Sensing properties.

2018 IEEE International Magnetic Conference (INTERMAG) Pub Date : 2018-04-01 DOI:10.1109/INTMAG.2018.8508377

C. Madhusudan

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Abstract

Improved electrochemical and sensing properties of CeO 2 nanoparticles were obtained by co-doping with $\mathrm {Y}^{3+}$ and Dy $^{3+}$ to attain Ce $^{4+} /$Ce $^{3+}$ valence states with the associated generation of oxygen vacancies. Ce $_{0.8} \mathrm {Y}_{0.20}x$ Dy $_{x} \mathrm {O}_{2- {\delta }}( \mathrm {x}=0.00,0.10,0.20)$ nanoparticles were synthesized by sol-gel auto combustion method, calcined at $800 ^{0}\mathrm {C}$ for 2hr in air and innovatively sintered by means of microwave heating at $1300 ^{0}\mathrm {C}$ for 30min. The phase identification, structural and morphological analysis were characterized by XRD, SEM, TEM and Raman Spectroscopy. The ionic conductivity was analyzed by Impedance Spectroscopy. The gas sensing properties were tested at room temperature. Intense $\mathrm {F}_{2g}$ Raman band at 460cm $^{-1}$ from Raman spectra in concurrence with XRD diffractograms revealed that the investigated samples exhibited the cubic fluorite structure of CeO 2. SEM and TEM results ascertained the nano level microstructure. The shift in XRD peak ascertained that the dopants were dissolved into the host lattice, and the subsequent creation of oxygen vacancies, due to the change in valence state from Ce $^{4+}$ to Ce $^{3+}$. The generation of oxygen vacancies and the resultant enhancement in ionic conductivity was validated by the results of Raman specta and Impedance analysis. Because of special microstructure, the obtained sample showed excellent gas sensing properties towards the ethanol at room temperature. High response, fast response-recovery time and excellent selectivity to ethanol gas, suggested the promising gas sensing application of the sample Ce 0.8Y0.10 Dy $_{0.10} \mathrm {O}_{2-\delta }$.

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Y/Dy共掺杂CeO2纳米粒子修饰Ce价态以获得有效的电学和传感性能。

通过$\ maththrm {Y}^{3+}$和Dy $^{3+}$共掺杂，得到Ce $^{4+}} /$Ce $^{3+}$价态，并产生氧空位，改善了ceo2纳米粒子的电化学和传感性能。采用溶胶-凝胶自燃烧法合成ce_ {0.8} \ mathm {Y}_{0.20}x$ Dy $_{x} \ mathm {O}_{2} - {\delta}}(\ mathm {x}=0.00,0.10,0.20)$纳米粒子，在$800 ^{0}\ mathm {C}$空气中煅烧2h，并采用$1300 ^{0}\ mathm {C}$微波加热30min进行创新烧结。采用XRD、SEM、TEM和拉曼光谱对其进行了物相鉴定、结构和形态分析。用阻抗谱法分析了离子电导率。在室温下测试了该材料的气敏性能。在460cm处的拉曼光谱和x射线衍射结果表明，所研究的样品具有立方萤石结构。SEM和TEM结果确定了纳米级微观结构。XRD峰的位移确定了掺杂剂被溶解到主体晶格中，随后由于价态从Ce $^{4+}$转变为Ce $^{3+}$而产生了氧空位。拉曼光谱和阻抗分析结果证实了氧空位的产生和离子电导率的增强。由于其特殊的微观结构，制备的样品在室温下对乙醇表现出优异的气敏性能。样品Ce 0.8Y0.10 Dy $_{0.10} \ mathm {O}_{2-\delta}$具有较高的响应速率、快速的响应恢复时间和良好的乙醇气体选择性，具有良好的气敏应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 IEEE International Magnetic Conference (INTERMAG)

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