Active Self-Assembled Monolayer Sensors for Trace Explosive Detection
Mingliang Li, Hongliang Chen, Shuo Li, Guozhi Wang, Feng Wei, Xuefeng Guo, Hailing Tu
Abstract
Trace explosives can be detected with the help of a portable device using a flexible active self-assembled monolayer (SAM). 9,10-diphenyl anthracene with aggregation-induced emission enhancement (AIEE) properties is selected as the fluorophore. Phosphoric acid as the anchor group is linked to the fluorophore through an alkyl chain and able to self-assemble into a dense monolayer on the HfO2 adhesion layer on a flexible substrate. The dense SAMs show high fluorescence intensity, which can be quenched by nitroaromatic compounds (NACs), and have advantages of high response rate, sensitivity, reversibility, and selectivity.
Topics & Concepts
MonolayerFluorophoreChemistryFluorescenceAlkylSubstrate (aquarium)AnthraceneExplosive materialSelectivitySelf-assembled monolayerSelf-assemblyPhosphoric acidPhotochemistryOrganic chemistryCatalysisBiochemistryGeologyPhysicsQuantum mechanicsOceanographyLuminescence and Fluorescent MaterialsMolecular Sensors and Ion DetectionPolydiacetylene-based materials and applications