A review on enhancing luminescence and colorimetric sensing in chitosan-based sensors with doping with organic and inorganic materials

Chitosan luminescent and colorimetric sensors based on organic and inorganic doped materials have shown great potential in various applications such as environmental monitoring, food safety, and biomedical research. Chitosan contains numerous free amino and hydroxyl groups that are easy to functionalize and change, and with excellent properties such as biodegradability and biocompatibility, that can act as a host molecule in sensors, forming supramolecular complexes with various guest molecules. The use of additives can significantly improve the sensitivity and selectivity of the sensor, making it a promising tool for the development of highly sensitive and selective detection systems. Furthermore, the low cost and easy fabrication of these sensors make them an attractive choice for practical applications in resource-constrained settings. This article provides an overview of the preparation and applications of chitosan-based fluorescent and colorimetric sensors and the effects of doping on its operations are being studied.