13 / 2017-08-25 15:05:30

Phase Control and Enhanced Gas Sensing Properties of metastable ε-Fe2O3

gas sensing,iron oxide,phase control,sol-gel,reverse micelle,metastable phase

《Integrated Ferroelectrics》（SCI检索） 英文全文 > 《Integrated Ferroelectrics》（SCI检索）

Different phase structures (α-Fe2O3, γ-Fe2O3 and ε-Fe2O3) of iron oxides (Fe2O3) were prepared by the same method- a combination method of reverse-micelle and sol-gel. The phase structures were controlled by adding different ionic additives (Na+ and Ba2+). The as-synthesized α-Fe2O3, γ-Fe2O3 and ε-Fe2O3 samples were investigated and discussed using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and an intelligent gas sensing analysis system. Interestingly, metastable ε-Fe2O3 showed an excellent selectivity for n-butanol, compared with the stable phases of α-Fe2O3 and γ-Fe2O3. It indicates that nanostructure ε-Fe2O3 could be a valuable material for the fabrication of advanced sensing devices.