Construction of d-amino acid biosensor based on d-amino acid oxidase immobilized onto poly (indole-5-carboxylic acid)/zinc sulfide nanoparticles hybrid film

► Constructed a polyindole 5-carboxylic acid/zinc sulfide nanoparticles hybrid film. ► Fabricated an improved amperometric d-amino acid biosensor based on this film. ► Biosensor had a detection limit of 0.001 mM and linear range 0.001-2.0 mM. ► It had enhanced response toward d-amino acids with sensitivity of 58.85 μA cm−2 mM−1. ► It also showed improved storage stability and reusability.