BTEX gas sensor based on hematite microrhombuses

Autor(es)

da Silva, Luis F. ^[1] ; Catto, Ariadne C. ^{[1, 2]} ; Bernardini, Sandrine ^[3] ; Fiorido, Tomas ^[3] ; de Palma, Joao V. N. ^[1] ; Avansi, Jr., Waldir ^[1] ; Aguir, Khalifa ^[3] ; Bendahan, Marc ^[3]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 326, JAN 1 2021.
• Citações Web of Science: 3

Resumo

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. (AU)

• Processo FAPESP: 18/18208-0 - Heteroestruturas a-Fe2O3/g-C3N4: Preparação, Caracterização e Aplicação como Sensores Resistivos de Gás
• Beneficiário: Ariadne Cristina Catto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 17/12437-5 - Preparação e caracterização de nanoheterojunções semicondutoras aplicadas como sensores resistivos de gás fotoativados
• Beneficiário: Luís Fernando da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular