Titanium dioxide–cellulose hybrid nanocomposite and its glucose biosensor application

This paper investigates the fabrication of titanium dioxide (TiO2)–cellulose hybrid nanocomposite and its possibility for a conductometric glucose biosensor. TiO2 nanoparticles were blended with cellulose solution prepared by dissolving cotton pulp with lithium chloride/N,N-dimethylacetamide solvent to fabricate TiO2–cellulose hybrid nanocomposite. The enzyme, glucose oxidase (GOx) was immobilized into this hybrid nanocomposite by physical adsorption method. The successful immobilization of glucose oxidase into TiO2–cellulose hybrid nanocomposite via covalent bonding between TiO2 and GOx was confirmed by X-ray photoelectron analysis. The linear response of the glucose biosensor is obtained in the range of 1–10 mM. This study demonstrates that TiO2–cellulose hybrid nanocomposite can be a potential candidate for an inexpensive, flexible and disposable glucose biosensor.

► An organic–inorganic hybrid nanocomposite was fabricated by blending TiO2 nanoparticles and cellulose solution.
► The hybrid nanocomposite has advantages of biodegradability and bio-compatibility of cellulose and physical properties of TiO2.
► Enzyme glucose oxidase (GOx) was immobilized into the hybrid nanocomposite and covalent bonding between TiO2 and GOx was confirmed by X-ray photoelectron analysis.
► Linear response of the glucose biosensor was obtained in the range of 1–10 mM.