NiFe2O4/CNTs fabricated by atomic layer deposition as highly stable peroxidase mimics for sensitive colorimetric detection of hydrogen peroxide and glucose

Abstract

Developing peroxidase mimics with high sensitivity and good stability is highly desired to meet broad practical requirements. In this work, the ultrathin NiFe2O4 coating on carbon nanotubes (NiFe2O4/CNTs) was obtained using an atomic layer deposition (ALD) method. The investigation on peroxidase-like performance indicated that the prepared 100NiFe2O4/CNTs nanocomposites exhibited highly efficient peroxidase-like activity. In particular, the peroxidase-like activity of 100NiFe2O4/CNTs was maintained well over a wide range of temperature. On the basis of its high peroxidase-like activity, a simple and effective approach was developed for the colorimetric detection of glucose with a detection limit of 2.2 μM and a linear detection range from 5 to 60 μM. The established method was successfully applied to the determination of glucose in juice samples with satisfactory results.