Organic heterojunction charge-transfer chemical sensors

Abstract

Chemical sensors based on blends of organic semiconductors with molecular sensitizers show exceptional sensitivity to amines by leveraging a charge transfer reaction.

Flexible dual-action colorimetric-electronic amine sensors based on N-annulated perylene diimide dyes

“…21,24,25 PDIN-H sensors would be capable of both colorimetric sensing, through the deprotonation of the pyrrolic N–H, and electronic sensing through ion charge transfer through the PDI core as demonstrated by Kaake and co-workers with a PDIN-H based amine sensor through combination with P(NDI2OD-2T). 26 These sensors enabled very high sensitivity, though the inclusion of a coloured conductive polymer does not allow for colorimetric sensing.…”