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(a) Gas response as function of formaldehyde concentration. (b) Formaldehyde selectivity and response compared to the reported values in the literature. (c) Repeated sensing transients to 5 ppm of formaldehyde at 23 °C under 365 nm UV radiation. (d) Long-term stability of the MMM/TiO2 sensor (UV light illumination during sensor measurement). Reprinted with permission from Ref. [110]. Copyright 2021 Springer Nature.
