Enhanced Electroactivity of Facet-Controlled Co_3O_4 Nanocrystals for Enzymeless Biosensing

• 作 者: Kuang-Hsu Wu Xue Leng Ian R.Gentle Da-Wei Wang
• 机 构: School of Chemistry and Molecular Biosciences,the University of Queensland,School of Chemical Engine
• 出 处: Journal of Materials Science & Technology
• 发表日期: 2016年01期
• 关键词: octahedral photoelectron exposed Controlled voltammetry characterize facet trunc

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).

In this work, we report the 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 glucose sensitivity of 32.54 μA (mmol / L) -1 (cm -2) .