Journal
NANOMATERIALS
Volume 5, Issue 3, Pages 1544-1555Publisher
MDPI
DOI: 10.3390/nano5031544
Keywords
biosensor; layer-by-layer; sol-gel; gold nanorods (AuNRs); carbon nanotubes
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Funding
- National Natural Science Foundation of China [81371646, 61378089]
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A novel amperometric glucose biosensor was fabricated by layer-by-layer self-assembly of gold nanorods (AuNRs) and glucose oxidase (GOD) onto single-walled carbon nanotubes (SWCNTs)-functionalized three-dimensional sol-gel matrix. A thiolated aqueous silica sol containing SWCNTs was first assembled on the surface of a cleaned Au electrode, and then the alternate self-assembly of AuNRs and GOD were repeated to assemble multilayer films of AuNRs-GOD onto SWCNTs-functionalized silica gel for optimizing the biosensor. Among the resulting glucose biosensors, the four layers of AuNRs-GOD-modified electrode showed the best performance. The sol-SWCNTs-(AuNRs-GOD)(4)/Au biosensor exhibited a good linear range of 0.01-8 mM glucose, high sensitivity of 1.08 A/mM, and fast amperometric response within 4 s. The good performance of the proposed glucose biosensor could be mainly attributed to the advantages of the three-dimensional sol-gel matrix and stereo self-assembly films, and the natural features of one-dimensional nanostructure SWCNTs and AuNRs. This study may provide a new facile way to fabricate the enzyme-based biosensor with high performance.
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