Ultrahigh sensitivity acetone sensor based on Gd2O3/Fe2O3 loose microspheres at low temperature

• Published in: Journal of materials science. Materials in electronics Vol. 30; no. 5; pp. 5008 - 5013
• Main Authors: Du, Liting, Liu, Li, Tang, Xiaonian, Li, Yu, Xu, Suyan, Gong, Yimin, Yang, Yang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2019; Springer Nature B.V
• Subjects: Acetone; Characterization and Evaluation of Materials; Chemistry and Materials Science; Electron microscopes; Gadolinium oxides; Low temperature; Materials Science; Microspheres; Morphology; Operating temperature; Optical and Electronic Materials; Recovery time; Selectivity; Sensitivity; Sensors; X ray powder diffraction
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-019-00797-0

Pure Fe 2 O 3 microspheres and Gd 2 O 3 /Fe 2 O 3 loose microspheres were synthesized successfully by a facile hydrothermal method and followed with calcined. The structure and elemental composition were provided by the X-ray powder diffraction (XRD) and energy-dispersive spectroscopy (EDS). Additionally, the morphology was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM), which show the loose surface state of Gd 2 O 3 /Fe 2 O 3 microspheres. Finally, the property of the gas-sensing sensor based on Gd 2 O 3 /Fe 2 O 3 loose microspheres was investigated systematically. It exhibits ultrahigh sensitivity of 268.6 to 100 ppm acetone at low operating temperature 220 °C, which is 9.8 times higher than the pure Fe 2 O 3 microspheres sensor (27.5/100 ppm). Remarkably, the response of Gd 2 O 3 /Fe 2 O 3 loose microspheres sensor to 0.1 ppm acetone is 2.3. Furthermore, the sensor shows fast response and recovery time (6/36 s) and splendid selectivity to acetone.