Fig. 3: The fabrication and performance evaluation of the artificial olfactory memory system.

a Schematic fabrication of the artificial olfactory memory system. b Schematic workflow of the artificial olfactory memory system. c Short-term memory curve for 100 ppm propanol. d Long-term memory curve for 100 ppm propionaldehyde. e Short-term memory curve of three successive stimuli for 100 ppm propanol. f Long-term memory curve of three successive stimuli for 100 ppm propionaldehyde. g Short-term memory curves for 100 ppm of methanol, ethanol, and propanol. h Long-term memory curves for 100 ppm of formaldehyde, acetaldehyde, and propionaldehyde. i Long-term memory curves for various concentrations of propionaldehyde (50−500 ppm). j Long-term memory grayscale map for varying concentration and time. k Seven-day stability curve for long-term memory.