A combined self-assembly and calcination method for preparation of nanoparticles-assembled cobalt oxide nanosheets using graphene oxide as template and their application for non-enzymatic glucose biosensing

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• 作者：Haiyan Zhang^a ; Sen Liu^b ; ^{liusen@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Co3O4 nanosheet ; Nanoparticles-assembled ; Graphene oxide ; Template ; Glucose biosensing
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：485
• 期：Complete
• 页码：159-166
• 全文大小：2165 K

文摘

Cobalt oxide (Co₃O₄)-based materials have been extensively investigated as efficient electrocatalysts for non-enzymatic glucose biosensing. The proper tuning the structure of Co₃O₄-based materials could improve sensing performances for glucose detection. Herein, we have developed a combined self-assembly and calcination method to prepare nanoparticles-assembled Co₃O₄ nanosheets, which exhibit good sensing performances for glucose biosensing. The Co₃O₄ nanosheets were prepared by the following three steps: (i) the Co²⁺ modified graphene oxide (GO) was prepared by the self-assembly of Co²⁺ and GO in aqueous solution firstly, and then Co²⁺ modified GO film was obtained by vacuum filtration method; (ii) after calcination of Co²⁺ modified GO film in N₂ atmosphere, Co₃O₄ nanoparticles modified reduced GO (RGO) was obtained; (iii) finally, nanoparticles-assembled Co₃O₄ nanosheets were obtained by calcination of Co₃O₄ modified RGO in air to remove RGO template. Most importantly, Co₃O₄ nanosheets exhibit good electrocatalytic activity for oxidation of glucose, leading to high-performance glucose sensor. The detection limit and linear range of Co₃O₄ nanosheets-based glucose sensor in the present work are 0.15 μM, and 1–50 μM, respectively. Furthermore, such sensor also shows excellent selectivity for glucose detection, compared to the commonly interfering species including dopamine, and uric acid.