Comparative H2S Sensing Characteristics of Fe2O3: Thin Film vs. Bulk

¹ Technical Physics Division, Bhabha Atomic Research Center, Mumbai, India;

² Technical Physics Division, Bhabha Atomic Research Center, Mumbai, India

³ Technical Physics Division, Bhabha Atomic Research Center, Mumbai, India

⁴ Technical Physics Division, Bhabha Atomic Research Center, Mumbai, India

⁵ Material Science Laboratory, Department of Physics, Guru Nanak Dev University, Amritsar, India.

⁶ Material Science Laboratory, Department of Physics, Guru Nanak Dev University, Amritsar, India.

⁷ Technical Physics Division, Bhabha Atomic Research Center, Mumbai, India;

⁸ Technical Physics Division, Bhabha Atomic Research Center, Mumbai, India

Abstract

Comparative investigations of gas sensing characteristics of Fe 2 O 3 in both thin film as well as bulk forms have been performed. Thin film sensors were realized by first depositing Fe films using electron-beam evaporation followed by thermal oxidation. Bulk sensors in the form of pellets were prepared by cold pressing commercial Fe 2 O 3 powder with subsequent sintering. Both thin film and bulk Fe 2 O 3 sensors exhibited a selective and reversible response characteristics towards H 2 S with maximum response at an operating temperature of 250°C and 200°C, respectively. A negligible response towards other interfering gases was observed. Thin film sensors exhibited an enhanced response in comparison to that of pellets.

KeywordsFe&ltsub&gt2&lt/sub&gtO&ltsub&gt3&lt/sub&gtThin FilmPelletsH&ltsub&gt2&lt/sub&gtS Sensor

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Comparative H<sub>2</sub>S Sensing Characteristics of Fe<sub>2</sub>O<sub>3</sub>: Thin Film vs. Bulk

Abstract

References (4)