Article ID Journal Published Year Pages File Type
7141753 Sensors and Actuators B: Chemical 2018 21 Pages PDF
Abstract
The ultrathin NiFe-layered double hydroxide nanosheets (NiFe-LDHNS) were prepared by exfoliating bulk LDH in l-asparagine aqueous medium. The transmission electron microscopy and atomic force microscopy results reveal that NiFe-LDHNS have about 200-300 nm lateral size and less than 2 nm thickness with the broken edges rather than the original hexagon of hydrotalcite. The peroxidase-like activity of the 2D NiFe-LDHNS was investigated by using oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine in presence of H2O2. The 2D NiFe-LDHNS exhibited the superior enzyme mimic activity to the bulk NiFe-LDH, which was attributed to the more exposed active sites and more accessible inner surface of single or several layers. Thus, a simple and sensitive non-enzyme biosensor was developed for colorimetric detection of H2O2 and glucose. The proposed method was successfully applied to glucose detection in real samples with satisfactory results.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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