Enhanced Electroactivity of Facet-Controlled Co₃O₄ Nanocrystals for Enzymeless Biosensing

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• 作者：Kuang-Hsu Wu¹ ; Xue Leng¹ ; Ian R. Gentle¹ ; Da-Wei Wang¹ ; ² ; ^{da-wei.wang@unsw.edu.au" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Co3O4 nanoparticles ; Crystal facets ; Glucose sensing
• 刊名：Journal of Materials Science & Technology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：32
• 期：1
• 页码：24-27
• 全文大小：1536 K

文摘

In this work, we report enhanced electroactivity of Co₃O₄ 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.