Abstract
A corn-like CeO2/C coaxial cable textured by a cerium oxide shell and a carbon core was designed to sense NO. The carbon core possesses high electrical conductivity, and the CeO2 surface delivers excellent electrocatalytic activity. The sensor, typicallyoperated at 0.8V (vs. Ag/AgCl), exhibits a detection limit of 1.7nM, which is 4-times lower than that of CeO2 nanotubes based one (at S/N = 3). It also displays wide linear response (up to 83μM), a sensitivity of 0.81μAμM-1cm-2, and fast response (2s). These values are highly competitive to that of a CeO2 tube (0.92μAμM-1cm-2 and 2s). The sensor was used to quantify NO that is released by Aspergillus flavus. Graphical abstractSchematic representation of corn-like CeO2/C whichcan more sensitively and effectively detect NO released from A. flavus than when using CeO2 nanotubes, benefitting from its unique coaxial cable structure.
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