In-situ hydrothermal synthesis of oriented hematite nanorods for sub- ppm level detection of ozone gas

Author(s)

Catto, Ariadne C. ; Bernardini, Sandrine ; Aguir, Khalifa ; Longo, Elson ; da Silva, Luis F.

• Document type: Journal article
• Source: Journal of Alloys and Compounds; v. 947, p. 5-pg., 2023-03-09.

Abstract

The development of simple and reproducible synthesis techniques for obtaining one-dimensional semi-conducting nanostructures is essential for the advancement of gas sensor devices. We report a facile and versatile approach for the in-situ growth of vertically oriented hematite nanorods to be applied as a re-sistive ozone gas sensor. The alpha-Fe2O3 nanorods were grown via a hydrothermal treatment directly onto an Al2O3 substrate with interdigitated Pt electrodes, thus facilitating the integration of nanorods into the sensing platform. At 150 degrees C, the gas-sensing experiments revealed a good sensitivity of these nanorods to different ozone concentrations (10-570 ppb), besides a fast response time and repeatable response-r-ecovery cycles. The present study offers a promising way for designing high-performance gas sensors based on hematite nanorods.(c) 2023 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 21/12684-8 - Processing of graphene/Fe2O3 composites: characterization and development of highly performance gas sensors
• Grantee: Ariadne Cristina Catto
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 22/02927-3 - Gas sensors based on n-type semiconductors operating at room temperature: investigation of their performance and mechanisms involved
• Grantee: Luís Fernando da Silva
• Support Opportunities: Research Grants - Initial Project
• FAPESP's process: 18/18208-0 - a-Fe2O3/g-C3N4 Heterostructures: Preparation, Characterization and Gas-sensing Properties
• Grantee: Ariadne Cristina Catto
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC