BTEX gas sensor based on hematite microrhombuses

SENSORS AND ACTUATORS B-CHEMICAL

卷:326

Article

da Silva, Luis F.¹  Catto, Ariadne C.^1,2  Bernardini, Sandrine³  Fiorido, Tomas³  de Palma, Joao V. N.¹  Avansi, Waldir, Jr.¹  Aguir, Khalifa³  Bendahan, Marc³ 

[1] Univ Fed Sao Carlos, Dept Phys, Lab Nanostruct Multifunct Mat, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Fed Sao Carlos, Ctr Dev Funct Mat, BR-13565905 Sao Carlos, SP, Brazil

[3] Aix Marseille Univ, Univ Toulon, IM2NP, CNRS, Marseille, France

关键词: Fe2O3;    Hematite;    Gas sensor;    BTEX;    Benzene;    Toluene;    Ethylbenzene;    Xylenes;   

DOI  :  10.1016/j.snb.2020.128817

来源: Elsevier

【 摘 要 】

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 (alpha-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.

【 授权许可】

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