Enhanced Electroactivity of Facet-Controlled Co3O4 Nanocrystals for Enzymeless Biosensing

摘要

In this work,we report enhanced electroactivity of Co_3O_4 nanocrystals(nanocubes,NCs and truncated nano-octahedra,TNO) on the exposed {111} facets as compared to the {001} facets in relation to the surface density and the activity of the octahedral Co^(III) species. Transmission electron microscopy,X-ray powder diffraction,X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy were employed to characterize the crystal facets and materials properties. The enhanced electroactivity of {111} crystal facets was evaluated by cyclic voltammetry and amperometric titration. Our results indicate that the {111} facets in TNO has a better electroactivity for enzymeless glucose sensing with a decent glucose sensitivity of 32.54 μA(mmol/L)^(-1)cm^(-2).