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Core-shell like Cu2O nanocubes enfolded with Co(OH)2 on reduced graphene oxide for the amperometric detection of caffeine

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Abstract

The authors report on the fabrication of Co(OH)2-enfolded Cu2O nanocubes on reduced graphene oxide (rGO), and the use of this material in an electrochemical caffeine sensor. The rGO/Cu2O/Co(OH)2 composite was characterized by X-ray powder diffraction pattern analysis, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy and Raman spectroscopy. A rotating disc glassy carbon electrode covered with the nanocomposite displays enhanced electrocatalytic activity towards the electro-oxidation of caffeine. The peak oxidation potential is at 1.4  V (vs. Ag/AgCl) and hence is strongly shifted to the negative side when compared to other modified electrodes. The calibration plot is linear in the 0.83 to 1200 μM concentration range, with a 0.4 μM detection limit (at a signal-to-noise ratio of 3). The modified electrode is sensitive, selective and stable. It was successfully applied to the determination of caffeine in (spiked) caffeine-containing beverages and coffee powder and gave recoveries that ranged from 95.7 to 98.3 %.

Co(OH)2 enfolded Cu2O nanocubes on reduced graphene oxide (rGO) for the caffeine sensor

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Acknowledgments

This project was supported by the Ministry of Science and Technology and the Ministry of Education of Taiwan (Republic of China). Authors express their sincere thanks to Dr. Selvakumar Palanisamy and Dr. Rajkumar Devasenathipathy for valuable help and fruitful discussions.

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Authors and Affiliations

  1. Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No.1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan, Republic of China

    Murugan Velmurugan, Natarajan Karikalan, Shen-Ming Chen & Chelladurai Karuppiah

  2. Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 106, Taiwan, Republic of China

    Chelladurai Karuppiah

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  1. Murugan Velmurugan
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  2. Natarajan Karikalan
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  3. Shen-Ming Chen
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  4. Chelladurai Karuppiah
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Correspondence to Shen-Ming Chen.

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Velmurugan, M., Karikalan, N., Chen, SM. et al. Core-shell like Cu2O nanocubes enfolded with Co(OH)2 on reduced graphene oxide for the amperometric detection of caffeine. Microchim Acta 183, 2713–2721 (2016). https://doi.org/10.1007/s00604-016-1914-4

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  • DOI: https://doi.org/10.1007/s00604-016-1914-4

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