Data from: Highly Selective CO2 Gas Sensing Properties of CaO-BaTiO3 Heterostructures Effectuated through Discretely Created n-n Nanointerfaces

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Globally recognized for its role as an occupational hazard, carbon dioxide (CO2) detection and monitoring is essential in agriculture, chemical manufacturing, and healthcare/clinical-oriented applications. Although, optical and chemical gas sensors are available commercially, current gas sensing technologies involving selective monitoring of CO2 at lower detection limits specifically for industrial conditions still remains a formidable challenge. Herein, we present a simple strategy for highly selective CO2 detection using an inexpensive transducer platform based on reversible chemisorbed carbonation between CO2 and CaO-BaTiO3 heterostructures. Microsensors showed an optimum sensitivity of 65% toward 1000 ppm of CO2 gas and superior selectivity when operated at 160 °C. Such a remarkable sensing performance originates from the discretely created n-n nanointerfaces and conveniently actualized staggered energy band positions that promote favorable charge transfer upon exposure to CO2 gas molecules even at parts per million levels. Reversible sensing phenomenon is demonstrated using operando time-resolved diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and correlated with energy band alignment determined from the ultraviolet diffuse reflectance (UV-DRS) spectra to propose the sensing mechanism.