Abstract
The work describes the synthesis of mesoporous α-Fe2O3 using two different forms of mesoporous silica MCM-41 and KIT-6 as hard templates employing nanocasting technique. The structural features of fabricated mesoporous α-Fe2O3 were studied using small angle X-ray scattering, X-ray diffraction and Fourier transform infrared spectroscopy. Surface properties of the oxides with porous morphology were studied by N2 sorption isotherms and Brunauer–Emmett–Teller studies, scanning electron microscopy and transmission electron microscopy. The mesoporous α-Fe2O3 oxides were then tested for detection of volatile organic compounds namely acetic acid, ethanol and formaldehyde. The α-Fe2O3 prepared from KIT-6 shows sensitivity of 45.21 towards acetic acid at temperature of 110 °C, much lower as compared to the temperatures reported in literature with short response and recovery times. The sensitivity obtained for acetic acid is over eight times higher than that for ethanol and formaldehyde making it a potentially selective sensor for acetic acid detection.
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Acknowledgements
The authors acknowledge the facilities at Guru Gobind Singh Indraprastha University, New Delhi. Authors acknowledge Surface Area Analysis Facility from Ozone Scientific Bengaluru and FTIR Characterization from SAIF, IIT Bombay and are thankful to Nidhi and Sujit for their help in sensing measurements. Vaishali Singh is thankful to Guru Gobind Singh Indraprastha University for providing financial support under Faculty Research Grant Scheme (FRGS) Project (File No. GGSIPU/DRC/FRGS/2018/3/1115).
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Dutt, M., Kaushik, A., Tomar, M. et al. Synthesis of mesoporous α-Fe2O3 nanostructures via nanocasting using MCM-41 and KIT-6 as hard templates for sensing volatile organic compounds (VOCs). J Porous Mater 27, 285–294 (2020). https://doi.org/10.1007/s10934-019-00811-0
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DOI: https://doi.org/10.1007/s10934-019-00811-0