NIR Dyes for Ammonia and HCI Sensors

Abstract

Dyes with absorption bands in the near infrared region (NIR dyes) were for a long time considered to have only a few practical applications other than as sensitisers in photographic emulsions. The situation has changed dramatically in recent years, with the rapid developments of many fields such as semiconductor laser technology, fibre optic communications, printing, data recording, photography, analytical tools for environmental and process monitoring, sensors techniques and medical diagnostics. This has resulted in research papers, books, review articles and chapters in books, all dedicated to the synthesis and applications of NIR dyes [1–5].