Self-assembled NiFe2O4/carbon nanotubes sponge for enhanced glucose biosensing application

In this work, self-assembled NiFe 2 O 4 /carbon nanotubes (CNTs) sponge was prepared by ice-templating method. The device synergized the advantageous features of both the 3D porous nanostructure and the catalytic properties of CNTs with GOx and NiFe 2 O 4 nanoparticles. The porous network construction of the NiFe 2 O 4 /CNTs sheets offered enlarged specific surface for GOx immobilization and opened channels for facilitating the electrons transport and reactants diffusion. With the help of the abnormal-valence elements Ni and Fe, double catalysis has happened and the enhanced glucose biosensing performance has been achieved. The fabricated glucose biosensor exhibited two large linear ranges (0–3.0 and 3.2–12.4   mM) and distinct sensitivities (84.1 and 24.6   μA   mM −1   cm −2 ).