Direct electrochemistry of glucose oxidase and sensing glucose using a screen-printed carbon electrode modified with graphite nanosheets and zinc oxide nanoparticles

Chelladurai Karuppiah, Selvakumar Palanisamy, Shen Ming Chen, Vediyappan Veeramani, Prakash Periakaruppan

研究成果: Contribution to journalArticle査読

38 被引用数 (Scopus)

抄録

We have studied the direct electrochemistry of glucose oxidase (GOx) immobilized on electrochemically fabricated graphite nanosheets (GNs) and zinc oxide nanoparticles (ZnO) that were deposited on a screen printed carbon electrode (SPCE). The GNs/ZnO composite was characterized by using scanning electron microscopy and elemental analysis. The GOx immobilized on the modified electrode shows a well-defined redox couple at a formal potential of −0.4 V. The enhanced direct electrochemistry of GOx (compared to electrodes without ZnO or without GNs) indicates a fast electron transfer at this kind of electrode, with a heterogeneous electron transfer rate constant (Ks) of 3.75 s−1. The fast electron transfer is attributed to the high conductivity and large edge plane defects of GNs and good conductivity of ZnO-NPs. The modified electrode displays a linear response to glucose in concentrations from 0.3 to 4.5 mM, and the sensitivity is 30.07 μA mM−1 cm−2. The sensor exhibits a high selectivity, good repeatability and reproducibility, and long term stability.

[Figure not available: see fulltext.].

本文言語英語
ページ(範囲)1843-1850
ページ数8
ジャーナルMicrochimica Acta
181
15-16
DOI
出版ステータス出版済み - 10 17 2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • 分析化学

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