The substantial optical features of perovskite quantum dots (PQD) lead to rapid growth in the investigation of their surface and lattice doping for optoelectronic and biochemical sensor advancements. Herein, we have used the surface ligand crafting model of PQD by ammonia and its optimum response to recognise ammonia in the sensing cellulose paper. The PQD with acetyl amine and octanoic acid capped were synthesized and entrapped in zeolites imidazole framework to delay the instant quenching and envisaged response to ammonia with high sensitivity. The hybrid perovskite quantum dots and Zeolite imidazolate framework-8 (PQD@ZIF-8) materials were further immersed in cellulose paper for solid-state sensor fabrication for the detection of ammonia by naked-eye and a Xiaomi Note-5 mobile camera. The ammonia was measured with high sensitivity at ambient conditions, with a detection limit of 16 ppm and a linear detection range of 1 to 500 ppm. This research provides a new platform for designing sensor selectivity and sensitivity, which could be used to further develop fluorescent nanomaterials-based sensors for small molecule detection.
Artificial olfactory system has been received increasing attention due to its important applications in future artificial nose, humanoid robot and next generation human-computer interface. However, it is still a challenge to completely simulate the functions of the human olfactory system recognize, remember and induce muscle movement from pungent odor . Here, we have developed a flexible artificial olfactory system by integrating Sr-ZnO-based gas sensors, HfO x -based memristors and electrochemical actuators, which can recognize and memorize and make the self-protection action for NH 3 . The Sr-ZnO gas sensor can perceive and recognize NH 3 through the change of resistance, and the signal transferred to the memristor can switch the resistance states for the storage of ammonia information. Meanwhile, the activation of memristor can also trigger the movement of the electrochemical actuator to block the gas flow channel analogous to the self-protection action of covering the nose with the hand when smelling irritating NH 3 . Our artificial olfactory system provides a promising strategy for future bioinspired electronics research, especially in the field of mimicking biological sensory systems.
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