α-Fe\(_{2}\)O\(_{3}\)@MWCNT nanocomposite-based chemiresistive sensor for room temperature ethanol detection

Gayatri  MOHAPATRA; Sabita  TRIPATHY; Jyoti  SHUKLA; Sunit Gourav  MOHANTY; Manoj Kumar  DEBNATH

doi:10.55713/jmmm.v36i4.2722

Authors

Gayatri MOHAPATRA Department of Electrical Engineering, Siksha O Anushandhan (deemed to be University), Bhubaneswar 751030, India
Sabita TRIPATHY Department of Electrical Engineering, Siksha O Anushandhan (deemed to be University), Bhubaneswar 751030, India
Jyoti SHUKLA Department of Electrical Engineering, SKIT M&G, Jaipur, Rajasthan,India
Sunit Gourav MOHANTY Department of Environmental Sciences, Sambalpur University, Burla 768019, India
Manoj Kumar DEBNATH Department of Electrical Engineering, Siksha O Anushandhan (deemed to be University), Bhubaneswar 751030, India

DOI:

https://doi.org/10.55713/jmmm.v36i4.2722

Keywords:

Ethanol, Fe2O3@MWCNT, LIG, Spray coating

Abstract

The development of low-cost nanostructured materials is vital to advancing the commercialization of sensors. In this study, α-Fe₂O₃@MWCNT nanocomposites were synthesized via a sustainable co-preparation approach, in which α-Fe₂O₃ was derived from readily available rusted iron, followed by calcination and subsequent mixing with multiwall carbon nanotubes (MWCNTs) to form a uniform sensing ink. The structural properties of the synthesized material were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The α-Fe₂O₃@MWCNT ink was then deposited onto laser-induced graphene electrodes for gas-sensing evaluation towards ethanol. The fabricated sensor exhibited a remarkable response and excellent selectivity toward ethanol at room temperature, displaying a response (R_gas/R_air) of 1.35, a response time of 98 s, and a recovery time of 70 s at 100 ppm. The enhanced sensing performance and cost-effective synthesis demonstrate the promise of rust-derived α-Fe₂O₃@ MWCNT composites for real-time ethanol monitoring in different applications.

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