期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 209, 期 -, 页码 622-629出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.12.019
关键词
WO3-In2O3 heterojunction nanofibers; Electrospinning; Low LOD; Acetone sensor
资金
- Application and Basic Research of Jilin Province [20130102010JC]
- National Nature Science Foundation of China [61134010, 61304242, 61327804, 61377058, 61374218]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- National High-Tech Research and Development Program of China (863 Program) [2013AA030902, 2014AA06A505]
A series of In2O3-WO3 heterojunction nanofibers were synthesized via the electrospinning technique in this study. The morphological and microstructural properties of these nanofibers have been characterized by XRD (X-ray diffraction), field emission scanning electron microscopy (FESEM), selected area electron diffractive (SAED), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The gas sensing properties of the In2O3-WO3 heterojunction nanofibers were evaluated. The results indicate that the sensor based on In2O3-WO3 nanofibers, in which the molar ratio of In2O3-WO3 is 1.5:100, exhibits the largest response toward 50 ppm acetone among those nanofibers, having a response about 12.9-50 ppm acetone, which is almost 2.5 times higher than that of sensor based on pure WO3 nanofibers at the optimum operating temperature. What's more, the sensor can detect acetone in sub-ppm concentrations with high response, the limit of detection (LOD) of the sensor based on heterojunction nanofibers is similar to 0.4 ppm, which is promising for being used in noninvasive detection of illnesses. (C) 2014 Published by Elsevier B.V.
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