Hydrothermal synthesis of monodisperse α-Fe2O3 hollow microspheroids and their high gas-sensing properties

被引：29

作者：

Zeng, Q. Z. ^{[1
]}

Ma, S. Y. ^{[1
]}

Jin, W. X. ^{[1
]}

Yang, H. M. ^{[1
]}

Chen, H. ^{[1
]}

Ge, Q. ^{[1
]}

Ma, L. ^{[1
]}

机构：

[1] Northwest Normal Univ, Coll Phys & Elect Engn, Key Lab Atom & Mol Phys & Funct Mat Gansu Prov, Lanzhou 730070, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 705卷

关键词：

Gas sensors; Monodisperse; Y-doped alpha-Fe2O3; Hydrothermal; Hollow structure; MAGNETIC-PROPERTIES; OPTICAL-PROPERTIES; TIO2; SPHERES; GRAIN-SIZE; SENSORS; ACETONE; OXIDE; SENSITIVITY; FILMS; NANOSTRUCTURES;

D O I：

10.1016/j.jallcom.2017.01.268

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Y-doped alpha-Fe2O3 hollow microspheroids were synthesized by one-pot hydrothermal reaction and subsequent annealing at 550 degrees C for 4 h. The as-synthesized alpha-Fe2O3 hollow microparticles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) and gas-sensing measurement device, and the results showed that the diameters of all these microparticles were around 1.6-2.3 mm. In order to demonstrate the potential application, gas sensors based on as-synthesized monodisperse alpha-Fe2O3 hollow microspheroids were fabricated. The gas sensing results showed that the response value of 4 wt% Y-doped alpha-Fe2O3 hollow microspheroids sensor to 200 ppm ethanol was 126.3 at the optimum operating temperature of 260 degrees C. Finally, the possible formation mechanism of alpha-Fe2O3 hollow microspheroids and the gas-sensing mechanism of sensors were proposed, too. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：427 / 437

页数：11

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