Trace hydrazine detection with fluorescent conjugated polymers: A turn-on sensory mechanism

Exposure of hydrazine vapor to conjugated-polymer films reduces the small number of oxidized trap sites that quench excitons. This scheme is effective for trace hydrazine detection with a detection limit of less than 1 ppm. The introduction of an oxidizing dopant quenches the polymer emission and permits detection of hydrazine with larger on/off ratios (see figure).