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BTEX Gas Sensor Based on Hematite Microrhombuses

Abstract : Over the past fifty years, gas sensors based on metal semiconducting oxides (MOXs) have drawn attention due to their performance in detecting various gases. Thus, we report herein on a BTEX gases sensor based on hematite (α-Fe2O3) microrhombuses synthesized via the hydrothermal method. X-ray diffraction and X-ray absorption spectroscopy analyses indicated the presence of a pristine hematite phase after hydrothermal treatment. Electron microscopy analyses revealed that the hematite sample consists of single-crystals with a rhombus-like shape and an average size of 140 nm. Electrical measurements pointed out that hematite microrhombuses were sensitive towards sub-ppm BTEX levels, in which the minimum detected level was 3 ppb and the long-term stability was 1 month. The results presented here demonstrate the potential of hematite microrhombuses as a sensing material to manufacture BTEX gas sensor devices.
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Submitted on : Monday, March 7, 2022 - 10:46:13 PM
Last modification on : Wednesday, May 4, 2022 - 5:27:50 PM


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Luís da Silva, Ariadne Catto, Sandrine Bernardini, Tomas Fiorido, João V.N. de Palma, et al.. BTEX Gas Sensor Based on Hematite Microrhombuses. Sensors and Actuators B: Chemical, Elsevier, 2021, 326, pp.128817. ⟨10.1016/j.snb.2020.128817⟩. ⟨hal-02928874⟩



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