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Dynamic responses of CaFe2O4 in varied vapor concentrations (i.e., 10, 20, 30, 50, and 100 ppm) of ethanol under activation of (a) blue (465 nm), (b) green (520 nm), (c) yellow (590 nm), (d) red (640 nm) LEDs and (e) dark condition (without illumination). (f) Comparison of the sensor sensitivity under visible light exposures and dark condition.
