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Open AccessArticle

The Effect of Eu Doping on Microstructure, Morphology and Methanal-Sensing Performance of Highly Ordered SnO2 Nanorods Array

by Yanping Zhao 1, Yuehua Li 2,†, Xingping Ren 3,*, Fan Gao 1 and Heyun Zhao 1,4,*
1
College of Materials Science and Engineering, Yunnan University, Kunming 650091, China
2
Advanced Measurement and Analysis Center of Dali University, Dali 671200, China
3
Yunnan Security and Technology Co. Ltd., Kunming 650033, China
4
Yunnan Key Laboratory for Micro/Nano Materials and Technology, Yunnan University, Kunming 650091, China
*
Authors to whom correspondence should be addressed.
Xingping Ren and Yangping Zhao contributed equally to this work.
Nanomaterials 2017, 7(12), 410; https://doi.org/10.3390/nano7120410
Received: 11 October 2017 / Revised: 8 November 2017 / Accepted: 14 November 2017 / Published: 23 November 2017
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. View Full-Text
Keywords: tin dioxide; nanorods arrays; Eu dopant; hydrothermal route; gas sensor tin dioxide; nanorods arrays; Eu dopant; hydrothermal route; gas sensor
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MDPI and ACS Style

Zhao, Y.; Li, Y.; Ren, X.; Gao, F.; Zhao, H. The Effect of Eu Doping on Microstructure, Morphology and Methanal-Sensing Performance of Highly Ordered SnO2 Nanorods Array. Nanomaterials 2017, 7, 410.

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