✍ Scribed by Ying Yang; Graham A. Turnbull; Ifor D. W. Samuel
No coin nor oath required. For personal study only.
Distributed feedback organic semiconductor lasers based on polyfluorene are shown to be suitable for use as chemical sensors for the detection of nitroaromatic‐based explosive vapors. The laser threshold is increased by a factor of 1.8 and the slope efficiency is reduced by a factor of 3 after exposure to the vapor. The sensing efficiency depends strongly on the excitation energy with a maximum efficiency of 85%. The temporal dynamics of the laser response to the analyte have been investigated. The laser emission falls to 60% of its initial value in 46 s. A model is developed to offer some insight into the diffusion of the vapor molecules inside the polymer layer.
📜 SIMILAR VOLUMES
A study was made of the explosive evaporation of a liquid beam using a 10.6 µm infrared laser. When a liquid water beam with a diameter larger than 50 µm was irradiated by a 50 W infrared laser in a direction at right angles to the liquid beam, plumes (i.e. jetlike streams), due to the explosive vap
## Abstract A selective and sensitive micellar electrokinetic chromatography method with laser‐induced fluorescence detection was developed for the quantification of ephedrine (E) and pseudoephedrine (PE) derivatized with 4‐chloro‐7‐nitrobenzo‐2‐oxa‐1,3‐diazole. After conducting a series of optimiz