Sakarya University Journal of Science (SAUJS) / Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi. Apr2025, Vol. 29 Issue 2, p140-150. 11p.

In this study, the influence of relative humidity on amorphous Fe2O3 thin film’ sensing properties towards aromatic and chlorinated hydrocarbon vapor and their adsorption kinetics were examined systematically. The sensing results showed that the relative humidity level has a significant effect not only on the aromatic and hydrocarbon sensing performance of Fe2O3 films but also on the baseline currents of the sensors. It was found that sensitivity increased approximately twofold when the relative humidity was raised from 20% to 40% in the presence of 14% toluene vapor. A comprehensive evaluation of the sensing performance indicated that the Fe2O3 film offers promising potential as a sensing element for the detection of toluene (C7H8) vapor, even at relatively high humidity levels at room temperature. The adsorption kinetics of toluene and carbon tetrachloride (CCl4) vapors on Fe2O3 were modeled using the Pseudo-first-order equation, as well as the Elovich and Ritchie models, and the key parameters of each model were determined and analyzed. Results from regression analysis indicated that the sensing performance and adsorption kinetics are dependent on the molecular structure of the analyte molecules. The Elovich model was found to be to describe the adsorption kinetics of the CCl4 on Fe2O3. On the other hand, first-order equation most accurately described the adsorption kinetics of C7H8 vapors on the Fe2O3 thin film, The Elovich and Ritchie’s kinetics models were not satisfactory. [ABSTRACT FROM AUTHOR]

Copyright of Sakarya University Journal of Science (SAUJS) / Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi is the property of Sakarya University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)