An exfoliated redox active imide covalent organic framework for metal free hydrogen gas sensing

Abstract

A two dimensional (2D) redox active donor–acceptor COF made of triphenylamine (TPA) and naphthalenediimide (NDI) acted as an efficient hydrogen chemisresistor and performed better than traditional metal oxides. Calculations have shown that the charge transfer interaction between H₂ and an NDI linker through a carbonyl functionality enables a change in the resistance of the material upon exposure to H₂ gas.