Detection of glucose with a lamellar-ridge architectured gold modified electrode

作者：Guo, Xingmei; Deng, Huimin; Zhou, Han; Fan, Tongxiang^*; Gao, Zhiqiang

来源：Sensors and Actuators B: Chemical , 2015, 206: 721-727.

DOI：10.1016/j.snb.2014.9.19

• Gold nanograin
• Butterfly scale
• Lamellar-ridge architecture
• Electrochemical sensor
• Glucose
• Mass transport

Nanocrystallized gold is frequently investigated for electrochemical sensors due to their unique catalytic properties. Constructing nanograin building blocks into three-dimensional architecture with large accessible surface area and efficient mass transport behavior is of great significance in enhancing sensing performance. Butterfly scales provide a large template warehouse for assembling gold nanograins into various architectures. Here, we synthesized lamellar-ridge architectured gold (lamellar ridge-Au) with nanograin size and submicrometer structural arrangement using blue scales of Morph butterfly as templates by an electroless deposition method. Unarchitectured gold (flat-Au) was also synthesized as a control using the flat wing membranes as templates under the same conditions. Both the architectured and unarchitectured gold samples were coated on glassy carbon electrodes with Nafion for amperometric detection of glucose in an alkaline medium, with the aim of exclusively demonstrating the architecture effect on electrochemical sensing behavior. Prominent performance in the detection of glucose was achieved with the lamellar ridge-Au modified electrode with a wide linear range from 2 mu M to 23 mM. The sensitivity was 5.8 times higher than that offlat-Au modified electrode. Also, the detection limit was lowered by 3.7 times to 0.87 mu M compared to its unarchitectured counterpart. The architecture assisting effect was attributed to the combined effect of increased surface area and efficient mass transport, which was demonstrated by finite element simulation. This work presents an exemplary strategy for optimizing nanograin assembled configurations and may provide a useful strategy for future structural design of efficient electrochemical sensors by drawing inspiration from butterfly-scale architectures.

• 出版日期2015-1
• 单位上海交通大学