Preparing Co₃O₄ urchin-like hollow microspheres self-supporting architecture for improved glucose biosensing performance

详细信息    查看全文

• 作者：Longjiang Ding^aAuthor Vitae ; Minggang Zhao^a ; ^{zhaomg@ouc.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Sisi Fan^aAuthor Vitae ; Ye Ma^bAuthor Vitae ; Jingjing Liang^aAuthor Vitae ; Xingtao Wang^aAuthor Vitae ; Yawen Song^aAuthor Vitae ; Shougang Chen^a ; ^{sgchen@ouc.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Self-supporting ; Glucose biosensor ; Electron transfer ; Detection potential ; Multiple responses
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：235
• 期：Complete
• 页码：162-169
• 全文大小：2219 K

文摘

A new Co₃O₄ electrode material with self-supporting urchin-like hollow microspheres structure was fabricated via a self-assembly method. Incorporating the adsorption and entrapment, the high porosity and large surface area were favorable for the highly effective immobilization of glucose oxidases. Multiple responses, consisting of enzymatic and material catalysis, were subsequently employed and achieved on the microsphere surface. As the radially oriented nanowires array provided a vast number of catalytic active sites, which lowered the energy barrier of glucose redox and acted as a media to boost the electron transfer, the detection potential was largely decreased. Furthermore, numerous electron transport paths in a short distance were formed among the interconnected bridge-like nanowires, resulting in improved electron transfer efficiency. The prepared glucose biosensor exhibited extra high sensitivity (102.77 μA mM⁻¹ cm⁻²), fast response (3 s) and outstanding selectivity and stability at a lower applied potential (0.35 V).