Ion-gel of cellulose can be used as dielectric materials . Cellulose such as CNC was reported as a flexible field-effect transistor (FET) . CNC can serve as substrate and dielectric materials. However, cellulose-based devices need a large operating voltage. The performance of cellulose can be improved via several methods, including mixing cellulose derivatives such as cyanoethyl cellulose-containing barium strontium titanate (BST, BaxSr1-xTiO3) nanoparticles . The materials exhibit high dielectric properties, making them suitable for preparing ultralow-power electronics with a high on/off ratio and low operating voltage.