Aligned polyaniline nanowires as electrode material for glucose biosensor

Non-enzymatic glucose biosensor is developed by utilizing the electrochemically grown nanocages-augmented polyaniline nanowires (NCa-PANI NWs) on silicon (Si) substrate. The NCa-PANI NWs are comprehensively analyzed in terms of the composition, optical, structural and the morphological properties. The grown NCa-PANI NWs are distributed uniformly on the entire surface of Si substrate, which confirms the formation of highly dense NCa-PANI NWs networks during the electrochemical oxidation. A series of sensing performances for NCa-PANI NWs electrode are investigated by current (I)-voltage (V), cyclic voltammetry (CV) and amperometry measurements. The sensing results reveal that fabricated non-enzymatic sensor shows an excellent response to glucose with a stable, reliable, and high sensitivity of ~156.4 mAmM^-1cm^-2, good detection limit of ~0.657 µM with correlation coefficient (R) of ~ 0.99493. The fabricated glucose sensor based on NCa-PANI NWs electrode exhibits significant electrochemical stability, good reproducibility and the selectivity.