Infrared (IR) spectroscopy allows for the identification of organic and inorganic compounds. When it comes to examine rough-surfaced solid samples, Diffuse Reflectance Infrared Fourier Transform (DRIFT)-spectroscopy is one of the most effective method [1]. Then, operando DRIFT-spectroscopy has been used in the present work to deeply investigate the sensing mechanism of three chemoresistive gas sensors based on SnO2, (Sn,Ti)xO2 and a new metal-oxide solid solution, namely (Sn,Ti,Nb)xO2, during their operation. The last is an interesting case study since Nb and Ti incorporation within the SnO2 lattice provided a number of advantages for gas sensing applications [2]. Indeed, (Sn,Ti)xO2 and (Sn,Ti,Nb)xO2 displayed minimal influence of relative humidity (RH%) on the films resistance, which is a significant gain because the effect of RH% on the baseline and on the sensitivity often reduces sensor accuracy and complicates calibrations. Moreover, addition of Nb enhanced selectivity and surface reactivity to some gases, e.g. hydrogen and ethanol
Operando DRIFT-spectroscopy on a three-metallic solid solution-based chemoresistive gas sensor
Elena Spagnoli;Barbara Fabbri;Arianna Rossi;Vincenzo Guidi
2023
Abstract
Infrared (IR) spectroscopy allows for the identification of organic and inorganic compounds. When it comes to examine rough-surfaced solid samples, Diffuse Reflectance Infrared Fourier Transform (DRIFT)-spectroscopy is one of the most effective method [1]. Then, operando DRIFT-spectroscopy has been used in the present work to deeply investigate the sensing mechanism of three chemoresistive gas sensors based on SnO2, (Sn,Ti)xO2 and a new metal-oxide solid solution, namely (Sn,Ti,Nb)xO2, during their operation. The last is an interesting case study since Nb and Ti incorporation within the SnO2 lattice provided a number of advantages for gas sensing applications [2]. Indeed, (Sn,Ti)xO2 and (Sn,Ti,Nb)xO2 displayed minimal influence of relative humidity (RH%) on the films resistance, which is a significant gain because the effect of RH% on the baseline and on the sensitivity often reduces sensor accuracy and complicates calibrations. Moreover, addition of Nb enhanced selectivity and surface reactivity to some gases, e.g. hydrogen and ethanolI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
