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

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.

Automated summary

The development of simple and reproducible synthesis techniques for obtaining one-dimensional semi-conducting nanostructures is crucial for gas sensor devices. This study presents a facile and versatile approach for the in-situ growth of vertically oriented hematite nanorods as a resistive ozone gas sensor. The grown alpha-Fe2O3 nanorods exhibited good sensitivity to different ozone concentrations, fast response time, and repeatable response-recovery cycles. This research provides a promising way for designing high-performance gas sensors based on hematite nanorods.