The increasing demand for precise detection of gaseous molecules towards diverse applications has led to expanding research for high-performance semiconductor-based chemical sensors. In particular, the employment of nanostructured materials in sensing films has stimulated the development of chemiresistive gas sensors, demonstrating that a change of nanostructures morphology leads to a change of active surface area and ultimately to the gas sensor sensitivity. Therefore, it becomes fundamental to deeply investigate the chemical phenomena occurring at the sensing film surfaces while analyzing the connected variations of the electronic structure and sensing characteristics. This correlation has become critical in chemical sensors since it represents the core of the gas-detection mechanism. Among the arsenal of characterization tools available to support mechanistic proposals, Fourier-transform infrared spectroscopy (FTIR) spectroscopy has been known for the investigation of surface chemistry of nanostructured materials. Accordingly, a variety of cells for in situ and operando spectroscopy have been developed for transient catalytic investigations. We designed, fabricated, and validated a new gas sensing system, which can be employed with solid-state gas sensors at operating temperatures up to 650 °C. It is equipped with a precision stage for the alignment of the sample, and it is fully compatible with Harrick Scientific's diffuse reflection optics.
Operando DRIFT for surface reactivity studies on chemiresistive gas sensor
B. Fabbri
;E. Spagnoli;A. Rossi;V. Guidi
2022
Abstract
The increasing demand for precise detection of gaseous molecules towards diverse applications has led to expanding research for high-performance semiconductor-based chemical sensors. In particular, the employment of nanostructured materials in sensing films has stimulated the development of chemiresistive gas sensors, demonstrating that a change of nanostructures morphology leads to a change of active surface area and ultimately to the gas sensor sensitivity. Therefore, it becomes fundamental to deeply investigate the chemical phenomena occurring at the sensing film surfaces while analyzing the connected variations of the electronic structure and sensing characteristics. This correlation has become critical in chemical sensors since it represents the core of the gas-detection mechanism. Among the arsenal of characterization tools available to support mechanistic proposals, Fourier-transform infrared spectroscopy (FTIR) spectroscopy has been known for the investigation of surface chemistry of nanostructured materials. Accordingly, a variety of cells for in situ and operando spectroscopy have been developed for transient catalytic investigations. We designed, fabricated, and validated a new gas sensing system, which can be employed with solid-state gas sensors at operating temperatures up to 650 °C. It is equipped with a precision stage for the alignment of the sample, and it is fully compatible with Harrick Scientific's diffuse reflection optics.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
