Abstract
Fast, sensitive, selective, and reliable detection of formaldehyde (FA) in the air on-site and at real-time remains a challenge for years. Herein, we report a totally new miniaturized FA luminescent tubular sensor, which depicted an experimental detection limit lower than 0.01 mg/m3, a response time less than 5 s, and a recovery time less than 20 s. Moreover, daily necessaries showed no observable interference to the detection, and no decay in the sensor’s performance was found after 130-cycle successive detections. The superior sensing performance of the sensor as developed was mainly ascribed to the application of a new sensing luminophore (Au-PBI), which is a chemical combination of a perylene bisimide derivative (Ref-PBI) with a cyclometalated alkynyl-gold(III) complex. Unlike Ref-PBI, Au-PBI is highly luminescent in solid state, enabling the film to show response to FA in a luminescence quenching way. Importantly, convenient detection of indoor FA was achieved via utilization of the tubular sensor as developed.
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