Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 505, Issue -, Pages 1039-1046Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.07.007
Keywords
alpha-Fe2O3; Porous structures; Rapid response time; Gas sensor; Low operating temperature
Categories
Funding
- National Key Research and Development Program [2016YFC0207300]
- National Nature Science Foundation of China [61503148, 61520106003, 61327804, 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]
- Science and Technology Development Program of Jilin Province [20170520162JH]
- China Postdoctoral Science Foundation [2015M580247]
- Graduate Innovation Fund of Jilin University [2016087]
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Porous alpha-Fe2O3 microflowers, which were composed of many nanospindles assembled by large numbers of nanoparticles, were successfully synthesized by calcining the FeSO4(OH) precursor prepared through a simple ethanol-mediated method. Various techniques were employed to obtain the crystalline and morphological properties of the as-prepared products. The formation process of such microstructure was proposed according to the morphology and component of the products obtained at different reaction time. Moreover, the obtained alpha-Fe2O3 was utilized as sensing materials upon exposure to various test gases. As expected, in virtue of the less-agglomerated configuration and unique porous structure, the hierarchical alpha-Fe2O3 microflowers exhibited higher response as well as faster response/recovery time to acetone when compared with alpha-Fe2O3 nanoparticles. Significantly, the response time was measured to be 1 s at the low operating temperature of 210 degrees C. (C) 2017 Elsevier Inc. All rights reserved.
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