Abstract
Abstract Crystalline nanoparticles of γ-Fe2O3 and α-Fe2O3 as candidates for gas sensing were synthesized by flame spray process (FSS). γ-Fe2O3 was obtained in a one step process, while α-Fe2O3 was obtained after heat-treatment of as-prepared γ-Fe2O3 nanoparticles. With a combination of diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), advanced near edge X-ray absorption fine structure (NEXAFS) spectroscopy, we probed the electronic structure and described the mechanisms of reducing gas sensing at the molecular scale and correlated the sensing property with charge transfer and valence band characteristics. The surface composition was determined by the XPS and resonance RBS (Rutherford backscattering spectrometry). The core level and valence band spectra of mild-oxidized and mild-reduced samples revealed the non-stoichiometric character of Fe2O3 and contribution of electronic surface defects. These two polymorphic forms of Fe2O3 exhibit significant differences of the chemical surface composition, electronic structure and resulting sensing properties.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
