Fabrication of CsPbBr3 Perovskite Quantum Dots/Cellulose- based Colorimetric Sensor: Dual-Responsive On-site Detection of Chloride and Iodide Ions

Cesium lead bromide perovskite quantum dots (PQDs) have recently attracted much attention because of their remarkable optoelectronic properties, such as high photoluminescence quantum efficiency, narrow emission, tunable wavelength, and color purity. However, despite these excellent properties, their instability in case of prolonged exposure to humidity, pH, and/or temperature limits their applicability. Here, we propose a simple and portable cellulose-based colorimetric sensor integrated with CsPbBr3 PQDs for the rapid naked-eye detection of chlorine and iodine ions. We synthesized the CsPbBr3 PQDs/cellulose composite via a hot injection method, which allows the formation of monodispersed CsPbBr3 PQDs with high sensitivity; given the strong adherence of the CsPbBr3 PQDs to the porous cellulose fibers, the composite exhibited excellent stability and durability against various humidity conditions along with superior photoluminescence properties. When applying our CsPbBr3 PQDs/cellulose composite as an earl...