Real-time monitoring of a chemical reaction through a dual-gas QEPAS sensor

Luigi Melchiorre; Arianna Elefante; Marilena Giglio; Andrea Zifarelli; Valeria Villada; Pietro Patimisco; Angelo Sampaolo; Marco Grande; Vincenzo Spagnolo

doi:10.1117/12.3001697

8 March 2024 Real-time monitoring of a chemical reaction through a dual-gas QEPAS sensor

Luigi Melchiorre, Arianna Elefante, Marilena Giglio, Andrea Zifarelli, Valeria Villada, Pietro Patimisco, Angelo Sampaolo, Marco Grande, Vincenzo Spagnolo

Author Affiliations +

Proceedings Volume 12895, Quantum Sensing and Nano Electronics and Photonics XX; 1289509 (2024) https://doi.org/10.1117/12.3001697
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Simultaneous detection of different gas species represents an indispensable asset for several applications, such as instantaneous quantification of isotope concentration ratios, self-calibrating sensors, and monitoring of the temporal evolution of a chemical reaction. In this research work, a dual-gas quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor for a real-time analysis and in a continuous flow monitoring of one reactant and one product of a gas-phase chemical reaction involving nitrogen dioxide (NO₂) and water vapor (i.e., H₂O) – as reaction reactants – and nitrogen monoxide (NO) – as one of the reaction products – was realized. The QEPAS sensor implemented a spectrophone composed of a pair of metallic acoustic resonator tubes applied at both antinode points of a custom quartz tuning fork (QTF). In this configuration, two different quantum cascade lasers (QCLs) were used, having an emission wavelength centered at 5.26 μm – resonant with a nitrogen monoxide absorption feature located at 1,900.075 cm^-1 – and at 6.25 μm – resonant with a nitrogen dioxide absorption feature located at 1,601.77 cm^-1 –, respectively. The chemical reaction was studied by injecting in the gas line a certified concentration of 5,000 parts-per-million (ppm) of NO₂:N₂ and monitoring the QEPAS signals at four different total gas flow values, i.e., 10, 20, 30 and 50 standard cubic centimeters per minute (SCCM), respectively.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Luigi Melchiorre, Arianna Elefante, Marilena Giglio, Andrea Zifarelli, Valeria Villada, Pietro Patimisco, Angelo Sampaolo, Marco Grande, and Vincenzo Spagnolo "Real-time monitoring of a chemical reaction through a dual-gas QEPAS sensor", Proc. SPIE 12895, Quantum Sensing and Nano Electronics and Photonics XX, 1289509 (8 March 2024); https://doi.org/10.1117/12.3001697

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