Ethanol and Hydrogen Gas-Sensing Properties of CuO–CuFe2O4 Nanostructured Thin Films

Saptarshi De (1) , Narayanan Venkataramani (1) , Shiva Prasad (1) , Rajiv Onkar Dusane (1) , Lionel Presmanes (2) , Yohann Thimont (3) , Philippe Tailhades (2) , Valérie Baco-Carles (2) , Corine Bonningue (2) , Sumangala Thondiyanoor Pisharam (1) , Antoine Barnabé (2)

1 IIT Bombay - Indian Institute of Technology Bombay
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 LRCS - Laboratoire réactivité et chimie des solides - UMR CNRS 7314

Nanocrystalline CuO-CuFe 2 O 4 composite thin films were developed from CuFeO 2 ceramic target using a radio-frequency sputtering method followed by a thermal oxidation process. This fabrication process helps to develop porous sensing layers which are highly desirable for solid-state resistive gas sensors. Their sensing properties toward ethanol and hydrogen gas in dry air were examined at the operating temperatures ranging from 250 °C to 500 °C. The electrical transients during adsorption and desorption of the test gases were fitted with the Langmuir single site gas adsorption model. A composite thin film with a total thickness of 25 nm showed highest response (79%) toward hydrogen (500 ppm) at the operating temperature of 400 °C. The shortest response time (τ res ) was found to be ~60 and ~90 s for hydrogen and ethanol, respectively. The dependence of the response of the sensor on gas concentration (10-500 ppm) was also studied.

Mots clés: Ethanol; Gas sensor; Hydrogen; Nanocrystalline; CuO–CuFe2O4; Thin film

Domaines: Matériaux; Chimie analytique; Matériaux

Saptarshi De, Narayanan Venkataramani, Shiva Prasad, Rajiv Onkar Dusane, Lionel Presmanes, et al.. Ethanol and Hydrogen Gas-Sensing Properties of CuO–CuFe2O4 Nanostructured Thin Films. IEEE Sensors Journal, 2018, 18 (17), pp.6937-6945. ⟨10.1109/JSEN.2018.2849330⟩. ⟨hal-02319546⟩