Structure dependence of lasing action in organic polymer films on DFB gratings for dinitrotoluene vapor detection

Abstract

Structure effects of distributed feedback (DFB) gratings on lasing action have been investigated for detecting explosive vapors. For the first time, we have established the optimized profiles of the DFB grating, and given the theoretical path to design its structure for amplified spontaneous emission (ASE) of organic polymer films based on Bragg conditions. A poly(p-phenylene ethynylene) (PPE) film can realize detection of dinitrotoluene (DNT) vapors in 2 min with a reduced excitation threshold of 26 mJ cm(-2) by using a simple and common 405 nm laser.

Fluorescent Si QD decoration onto a flexible polymeric electrospun nanofibrous mat for the colorimetric sensing of TNT

“…Although in the literature. TNT vapour 42 is used with some other techniques 43,44 for the detection of TNT molecules, since TNT is an important and water-soluble pollutant, we focused on aqueous detection. Some studies 44 focus on the SERS detection of the TNT, but TNT is a water-soluble molecule and its detection in soil-based environments is vital.…”