Abstract
A novel flowers-shaped porous active graphene microelectrode has been fabricated by directly electrochemical assembly and reduction of graphene oxide on platinum (Pt) wire with a diameter of 250 μm. The flowers-shaped graphene microelectrode was characterized by SEM, XRD and electrochemical techniques. Results showed that the flowers-shaped graphene microelectrode created a favorable microenvironment for the GOD. The as prepared graphene microelectrode exhibited excellent electron transfer properties for GOD with the rate constant (ks) of 2.18 s−1 and achieved the direct electrochemistry of GOD. It is notable that the glucose biosensor of GOD@flowers-shaped graphene microelectrode showed two linear ranges in 8.0–148.0 μM with the sensitivity of 267.34 μA mM−1 cm−2 and in 148.0–430.6 μM with the sensitivity of 38.15 μA mM−1 cm−2 for detecting glucose. Furthermore, the biosensor possessed strong anti-interference, remarkable stability and appreciable reproducibility for the sensitive determination of glucose. It would also be extended to other analogous enzymes and bioactive molecules for various biological and electrochemical applications.
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