期刊
JOURNAL OF MATERIALS CHEMISTRY B
卷 1, 期 17, 页码 2289-2296出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tb20078g
关键词
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资金
- Spanish Ministerio de Ciencia e Innovacion [CTQ2011-24355, CTQ2012-34238]
- Comunidad de Madrid [S2009/PPQ-1642]
Reduced graphene nanoparticles were prepared from graphene oxide through a two-step covalent modification approach. Graphene oxide was first enriched with reactive epoxy groups by anchoring (3-glycidyloxypropyl) trimethoxysilane at the hydroxyl groups located on the nanocarbon basal plane. Modified graphene oxide was further cross-linked and partially reduced by treatment with the fourth-generation ethylenediamine core polyamidoamine G-4 dendrimer producing graphene nanoparticles with crumpled paper-like morphology. This graphene derivative was employed as a coating material for glassy carbon electrodes and the nanostructured electrode was tested for the preparation of electrochemical biosensors by immobilizing the enzyme tyrosinase through cross-linking with glutaraldehyde. This bioelectrode showed excellent electroanalytical behavior for catechol with a fast response in about 6 s, linear range of 10 nM to 22 mu M, sensitivity of 424 mA M-1, and low detection limit of 6 nM. The enzyme biosensor also showed high stability when stored at 4 degrees C under dry and wet conditions.
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