Journal
MICROCHIMICA ACTA
Volume 178, Issue 3-4, Pages 439-445Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-012-0814-5
Keywords
MgO; Nanostructures; Biosensors; Chemical vapor deposition; Hydrogen peroxide
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Funding
- National Natural Science Foundation of China [51101129]
- Natural Science Foundation Project of CQ CSTC [2009BB4304]
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Tubular tetrapod magnesium oxide (tt-MgO) can be synthesized by thermal evaporation of Mg metal powder with a pre-grown tetrapod ZnO template. The morphology and structure of the tt-MgO were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. A composite prepared from tt-MgO, nafion and horseradish peroxidase was employed to modify a gold electrode to result in an electrochemical biosensor for hydrogen peroxide that displays excellent sensitivity and rapid response in the presence of hydroquinone as a mediator. Its sensitivity is 335.4 mu A mM(-1) cm(-2), its response is linear in the range from 1.0 to 450 mu M, and the detection limit is 0.3 mu M. These results demonstrate that tt-MgO provides a promising material for the designs of biosensors.
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