Journal
SOLID STATE SCIENCES
Volume 12, Issue 12, Pages 2125-2129Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2010.09.010
Keywords
Hierarchical structure; Goethite; Hematite; Mesoporous; Gas sensor
Funding
- 973 National Key Basic Research Program of China [2007CB310500]
- Hunan Provincial Natural Science Foundation of China [10JJ1011]
- National Natural Science Foundation of China [21003041]
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We reported a facile and efficient solution-based route to prepare novel flowerlike alpha-FeOOH architectures without any template or surfactant Scanning electron microscope (SEM) images reveal that leaflike nanosheets with a thickness about 40 nm assembled into flowerlike superstructures On the basis of time-dependent experiments a multistage reaction mechanism for the formation of the flowerlike alpha-FeOOH was proposed After heat treatment the flowerlike alpha-FeOOH could be converted into corresponding mesoporous alpha-Fe2O3 Transmission electron microscopy (TEM) images and porosity analysis showed that the nanosheets have porous walls with a pore size of about 7 nm As a demonstration of potential application for gas-sensing materials the mesoporous alpha-Fe2O3 nanostructures exhibited short response/recovery time within 5/10 s and low response concentration of 1 ppm toward acetone vapors Large specific surface area and mesoporous structure should be beneficial for the sensing properties of alpha-Fe2O3 (C) 2010 Elsevier Masson SAS All rights reserved
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