Chemical sensors are useful in detecting many airborne chemicals for monitoring air quality, studying environmental health, and protecting people from harmful chemical exposures. Major efforts have been made to develop low cost and high performance chemical sensors. Electrochemical and metal oxide semiconductors are widely used airborne chemical sensors,...

Colorimetry is a well-known and widely used sensing platform that detects a color change associated with a reaction between a target chemical and sensing materials. Colorimetric sensors are useful in many applications including sensing toxic chemicals in air as well as detecting biomarkers in breath, urine, blood and other types of body fluids. In multiplexed...