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

Guo, Xingmei ; Deng, Huimin ; Zhou, Han ; Fan, Tongxiang ; Gao, Zhiqiang

Sensors and actuators. B, Chemical, 2015-01, Vol.206, p.721-727 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Detection of glucose with a lamellar-ridge architectured gold modified electrode
  • Autor: Guo, Xingmei ; Deng, Huimin ; Zhou, Han ; Fan, Tongxiang ; Gao, Zhiqiang
  • Assuntos: Butterfly scale ; Electrochemical sensor ; Glucose ; Gold nanograin ; Lamellar-ridge architecture ; Mass transport
  • É parte de: Sensors and actuators. B, Chemical, 2015-01, Vol.206, p.721-727
  • Descrição: •Elaborately architectured butterfly-scales as template.•Lamellar ridge-Au with nanograin size and submicrometer structural arrangement.•Prominent glucose oxidation and detection performance.•Unique zigzag mass transport property and efficient thin layer diffusion effect.•Toward structural design of efficient electrochemical sensors. 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 2μM to 23mM. The sensitivity was 5.8 times higher than that of flat-Au modified electrode. Also, the detection limit was lowered by 3.7 times to 0.87μM 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.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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