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Polymer electrolytes serve as highly efficient alternatives to liquid electrolytes, especially in terms of safety in lithium ion batteries. Among various polymers, Cellulose contains electron‐donating atoms which can coordinate with lithium salts and be used as polymer electrolyte. Also, cellulose can be blended with other polymers to improve their properties. Polymer electrolytes suffer from poor mechanical properties. Adding nanoparticles not only surmounts the drawback of poor mechanical properties but also improves physical and electrochemical properties. In this study, different weight ratios of PVDF/cellulose blend films containing silicon dioxide (SiO2) are prepared via solution casting method. The results explored ionic conductivity in order of 10−4 S cm−1. In addition, high transfer numbers (0.74

Iron is crucial for various biological processes in humans, animals, and plants, making precise and efficient monitoring of iron ion concentrations essential. To address this need, a cellulose‐based smart fluorescent material (NCC@NH2@RB) with a conjugated structure is designed and synthesized for the rapid and sensitive detection of Fe3+ ions. This sensor features core‐shell nanoparticles functionalized with rhodamine B (RB), using (3‐aminopropyl)triethoxysilane (APTES) as a linker. The resulting fluorescent probe, composed of nanocrystalline cellulose and RB, exhibits strong fluorescence under ultraviolet light, making it an effective tool for Fe3+ ion detection in water. When Fe3+ ions are introduced into a solution containing NCC@NH2@RB, they bind with weak‐field ligands such as nitrogen and oxygen in the probe's structure, forming complexes. This interaction involves high‐spin coordination and leads to the self‐assembly of Fe3+ ions on the surface of NCC@NH2@RB. The process generates single electrons, increasing paramagnetism and quenching the fluorescence. The NCC@NH2@RB fluorescent probe has a limit of detection (LOD) of 0.01 µM and a limit of quantification (LOQ) of 0.03 µM with linearity at concentrations of 1.0 × 10−4–2.5 × 10−3 m. This fluorescence quenching effect is specific to Fe3+ ions, ensuring that the probe remains unaffected by other metal ions. [ABSTRACT FROM AUTHOR]