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Exposure of toxic vapors had a harmful effect on human health. The solid-phase microextraction (SPME) device has been widely used because of its great simplicity, high efficiency, and low cost, especially when used for analysis of gaseous compounds through coupling with GC-MS. In this work, an on-site SPME-like handy detection device (termed AIE Handy Pen) was developed by decoration of toxic vapors responsive AIEgens (TPE-Py, responsive to diethyl chlorophosphite (DCP, nerve agent) or 1,2-dihydroquinoxaline (DQ2), responsive to amine vapor) on the SPME fiber by a sol–gel process. Thanks to its unique solid-state emission characteristics, the AIEgens can be illuminated upon exposure to gaseous compounds on the fiber, and the fluorescence of the reacted AIEgens could be easily visualized under UV-illumination. The detection limit could be as low as 3.4 ppb (for DCP vapors) or 0.2 ppm (for amine vapors) with the minimal detection time of 30 min (for DCP vapors) or 5 min (for amine vapors). This AIE pen could be easily expanded by decoration of different kinds of responsive AIEgens for on-site analysis of various toxic vapors.

AIE–active montmorillonite nanocomposite powders (AIE–MMT) were developed for computer-assistant latent fingerprint (LFP) imaging.

Development of an easy-to-use, low-cost, household device can help the consumer quickly identify an organophosphorus (OP) residue concentration level. In this work, we demonstrate a 3D-printed, portable, fluorescent-sensing platform for smartphone-capable detection of OPs in vegetables. For development of the proposed device, we utilize the smartphone for capturing the strong thiol-activated fluorescence, which was produced by hydrolysis of OPs in the presence of alkali. The thiol-responsive AIEgen (maleimide-functionalized tetraphenylethylene) was non-emissive in both solution and the solid state but could be readily lighted up by the click addition of thiol to its MI pendant. An android application “Detection” has been developed on the basis of the gray value to analyze the different concentration levels of OPs in vegetable samples. The gray value was linearly related with the concentration of five kinds of organophosphorus residue, ranging from 0 to 20 μg/mL. It was also applied for determination of OPs residue in the leaves of cowpea, celery, and Chinese cabbage. Different from acetylcholinesterase enzyme-based sensors for poor stability under high temperature, the proposed method was a direct detection method for OPs and can be used for rapid monitoring of OPs residue concentration levels before LC-MS analysis.

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Development of affordable, simple and effective methods for rapid on-site identification of genetically modified organisms (GMO) is urgent due to public concern for transgenic food.

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