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Synthesis of Hollow Iron Oxide Nanospheres and Their Application to Gas Sensors
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- Authors
- Kyung Hee Oh, Hyung Ju Park, Shin Wook Kang, Ji Chan Park, Ki Min Nam
- Issue Date
- 2018-02
- Citation
- Journal of Nanoscience and Nanotechnology, v.18, no.2, pp.1356-1360
- ISSN
- 1533-4880
- Publisher
- American Scientific Publishers (ASP)
- Language
- English
- Type
- Journal Article
- Abstract
- Hollow nanomaterials have attracted great interest because of their many applications in catalysis, nanoreactors, drug delivery systems, for lubrication and in gas sensors. Here, carbon sphere templates were prepared from glucose under hydrothermal conditions to facilitate the synthesis of hollow Fe2O3 nanospheres. Thermal decomposition of an iron precursor in benzylalcohol with the carbon spheres resulted in the deposition of Fe3O4 nanoparticles on the carbon sphere templates. The nanoparticles on the carbon surface naturally agglomerate and form a dense oxide shell during the calcination step, which produces typical Fe2O3 hollow structures. The gas sensing performance of the hollow Fe2O3 nanospheres was investigated at an operating temperature of 300°C. The hollow Fe2O3 nanospheres showed high sensitivity (R = 10766 at 1 ppm formaldehyde) with a linear response to formaldehyde gas concentration in the range of 08-24 ppm, and good selectivity to formaldehyde gas in volatile organic compounds, compared to commercial Fe2O3 nanoparticles.
- KSP Keywords
- Carbon spheres, Drug Delivery Systems(DDS), Fe3O4 nanoparticles, Formaldehyde gas, Good selectivity, High Sensitivity, Hollow structure, Hydrothermal conditions, Iron oxide nanospheres, Iron precursor, Thermal Decomposition